Best and Worst Months to Visit San Francisco: Weather and Seasonal Guide

Quick Weather Answer: Best and Worst Time to Visit San Francisco

The best time to visit San Francisco for weather is usually March, when average daytime temperatures are around 60F (16C) and nights are near 46F (8C). The worst time to visit San Francisco is usually December, because the weather is less comfortable for long walks, outdoor sightseeing, and casual transit-heavy days.

• Best month for weather: March
• Worst month for weather: December
• Most comfortable season: Spring
• Hottest month: September, with average highs near 75F (24C)
• Coldest month: January, with average lows near 44F (7C)
• Rainiest month: December, with about 5.2 inches of rain
• Driest month: July, with about 0.1 inches of precipitation
• Most unpredictable weather period: the wettest winter months
• Best weather for a first-time trip: March, April, and May

What Is the Weather Like in San Francisco?

San Francisco has a relatively mild maritime climate, so extreme temperatures are less common than gray skies, wind, rain, and quick day-to-day changes. The San Francisco climate by month shows average highs from about 56F (13C) in the coolest part of the year to about 75F (24C) in the hottest part. Annual precipitation averages roughly 24.1 inches.

Weather in San Francisco changes the feel of the city because this is a place where comfort depends on more than the number on a forecast. A mild month can make metro transfers, neighborhood walks, outdoor meals, and photography feel easy. A difficult month can make the same itinerary feel slower, sweatier, colder, wetter, or more dependent on indoor breaks.

Best Month to Visit San Francisco for Weather

March is the best month to visit San Francisco for weather in a typical year. Average daytime highs are near 60F (16C), while nights are around 46F (8C). Precipitation averages 3.2 inches, so the month is usually more comfortable than the wetter, hotter, or colder parts of the year.

What makes March stand out is balance. It is not necessarily perfect every day, but it usually gives travelers the best combination of outdoor comfort, manageable weather risk, and enough flexibility for a first-time trip. If hotel prices or crowds rise during this period, that popularity is at least partly weather-driven.

Worst Month to Visit San Francisco for Weather

December is the worst month to visit San Francisco from a pure weather perspective. Average highs are around 56F (13C), and nights are near 44F (7C). The month also brings moderate rain, averaging about 5.2 inches, which can make long outdoor days less comfortable.

Rain is the main problem. The month is not impossible, but showers and damp conditions can interrupt outdoor plans and make transit transfers less pleasant. Lower hotel prices or fewer visitors can make December acceptable for flexible travelers, but it is not the month I would choose for the best weather in San Francisco.

San Francisco Weather by Season

Spring Weather in San Francisco

In San Francisco, spring usually means March, April, and May. Daytime highs typically run from 60F (16C) to 66F (19C), with nights from about 46F (8C) to 50F (10C). Across the season, precipitation averages around 5.6 inches. This is one of the more comfortable stretches of the year for walking, transit transfers, outdoor meals, and photography. The best spring month for weather is usually March, while March is the least comfortable part of the season.

Summer Weather in San Francisco

In San Francisco, summer usually means June, July, and August. Daytime highs typically run from 71F (22C) to 74F (23C), with nights from about 52F (11C) to 55F (13C). Across the season, precipitation averages around 0.3 inches. This is one of the more comfortable stretches of the year for walking, transit transfers, outdoor meals, and photography. The best summer month for weather is usually June, while June is the least comfortable part of the season.

Fall Weather in San Francisco

In San Francisco, fall usually means September, October, and November. Daytime highs typically run from 63F (17C) to 75F (24C), with nights from about 48F (9C) to 55F (13C). Across the season, precipitation averages around 4.0 inches. This is one of the more comfortable stretches of the year for walking, transit transfers, outdoor meals, and photography. The best fall month for weather is usually September, while September is the least comfortable part of the season.

Winter Weather in San Francisco

In San Francisco, winter usually means December, January, and February. Daytime highs typically run from 56F (13C) to 58F (14C), with nights from about 44F (7C) to 45F (7C). Across the season, precipitation averages around 14.2 inches. Rain and humidity shape the season, so outdoor plans need more flexibility than the temperature alone suggests. The best winter month for weather is usually February, while December is the least comfortable part of the season.

San Francisco Weather by Month: What to Expect

January in San Francisco

January in San Francisco typically brings daytime highs around 56F (13C) and nighttime lows near 44F (7C). Expect moderate rain, averaging about 4.7 inches, and average winds near 5 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack a warm jacket, layers, a compact umbrella or rain shell. Verdict: January is a good month for weather in San Francisco.

February in San Francisco

February in San Francisco typically brings daytime highs around 58F (14C) and nighttime lows near 45F (7C). Expect moderate rain, averaging about 4.2 inches, and average winds near 5 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack a warm jacket, layers, a compact umbrella or rain shell. Verdict: February is a good month for weather in San Francisco.

March in San Francisco

March in San Francisco typically brings daytime highs around 60F (16C) and nighttime lows near 46F (8C). Expect moderate rain, averaging about 3.2 inches, and average winds near 5 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is the best of the year for most travelers. Pack comfortable layers, a light jacket, a compact umbrella or rain shell. Verdict: March is one of the best weather months in San Francisco.

April in San Francisco

April in San Francisco typically brings daytime highs around 63F (17C) and nighttime lows near 47F (8C). Expect some rain, averaging about 1.6 inches, and average winds near 6 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: April is a good month for weather in San Francisco.

May in San Francisco

May in San Francisco typically brings daytime highs around 66F (19C) and nighttime lows near 50F (10C). Expect dry weather, with only about 0.8 inches of rain, and average winds near 6 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: May is a good month for weather in San Francisco.

June in San Francisco

June in San Francisco typically brings daytime highs around 71F (22C) and nighttime lows near 52F (11C). Expect dry weather, with only about 0.2 inches of rain, and average winds near 6 mph. In real life, this is one of the easier kinds of city weather, with comfortable walking conditions and only limited weather friction.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: June is a good month for weather in San Francisco.

July in San Francisco

July in San Francisco typically brings daytime highs around 72F (22C) and nighttime lows near 54F (12C). Expect dry weather, with only about 0.1 inches of rain, and average winds near 5 mph. In real life, this is one of the easier kinds of city weather, with comfortable walking conditions and only limited weather friction.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: July is a good month for weather in San Francisco.

August in San Francisco

August in San Francisco typically brings daytime highs around 74F (23C) and nighttime lows near 55F (13C). Expect dry weather, with only about 0.1 inches of rain, and average winds near 5 mph. In real life, this is one of the easier kinds of city weather, with comfortable walking conditions and only limited weather friction.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: August is a good month for weather in San Francisco.

September in San Francisco

September in San Francisco typically brings daytime highs around 75F (24C) and nighttime lows near 55F (13C). Expect dry weather, with only about 0.2 inches of rain, and average winds near 5 mph. In real life, this is one of the easier kinds of city weather, with comfortable walking conditions and only limited weather friction.

Outdoor comfort is very comfortable for most travelers. Pack light clothing, sunglasses, a light layer for evenings. Verdict: September is a good month for weather in San Francisco.

October in San Francisco

October in San Francisco typically brings daytime highs around 72F (22C) and nighttime lows near 53F (12C). Expect some rain, averaging about 1.3 inches, and average winds near 4 mph. In real life, this is one of the easier kinds of city weather, with comfortable walking conditions and only limited weather friction.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: October is a good month for weather in San Francisco.

November in San Francisco

November in San Francisco typically brings daytime highs around 63F (17C) and nighttime lows near 48F (9C). Expect some rain, averaging about 2.6 inches, and average winds near 4 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is very comfortable for most travelers. Pack comfortable layers, a light jacket. Verdict: November is a good month for weather in San Francisco.

December in San Francisco

December in San Francisco typically brings daytime highs around 56F (13C) and nighttime lows near 44F (7C). Expect moderate rain, averaging about 5.2 inches, and average winds near 5 mph. In real life, the month feels usable but changeable, with enough mild weather for outdoor plans and enough cool or wet spells to require backup layers.

Outdoor comfort is still workable, but less reliable than the better months for most travelers. Pack a warm jacket, layers, a compact umbrella or rain shell. Verdict: December is the weakest weather month in San Francisco, even if prepared travelers can still make it work.

Month-by-Month Weather Table for San Francisco

Hottest Time of Year in San Francisco

The hottest time of year in San Francisco is usually August and September. The hottest month in San Francisco is September, with average highs near 75F (24C) and nights around 55F (13C). If humidity or strong sun is present, the heat can feel more demanding than the average high suggests.

Early mornings and evenings are usually better than midafternoon during this period. If the hot months overlap with summer vacation or peak travel, the city may still be busy, but from a weather perspective this is not automatically the most comfortable time to visit.

Coldest Time of Year in San Francisco

The coldest time of year in San Francisco is usually January, February, March, and December. The coldest month in San Francisco is January, with average lows near 44F (7C) and daytime highs around 56F (13C). Snow is not the main issue, but cool mornings, wind, rain, or shorter daylight can still affect comfort.

Rainiest, Snowiest, or Most Humid Months in San Francisco

The rainiest month is usually December, with about 5.2 inches of rain. This is the month when showers, humidity, storms, or wet pavement are most likely to shape the trip. It can still be possible, but it is less reliable for outdoor-heavy plans.

Driest and Clearest Months in San Francisco

The driest month in San Francisco is usually July, with about 0.1 inches of precipitation. The broader dry-weather window often includes July, August, and September. These months are generally better for walking, photos, outdoor meals, and day trips because the odds of weather interruptions are lower.

Most Unpredictable Weather Period in San Francisco

The most unpredictable weather period in San Francisco is usually the wettest winter months. During this stretch, travelers should expect the forecast to matter more than the calendar. Pack flexible layers, check conditions before long walks, and avoid building a trip around only one kind of weather.

Best Weather for First-Time Visitors

For a first-time trip, the best weather window is usually March, April, and May. This period gives the strongest balance of mild temperatures, manageable rain, outdoor comfort, and enough daylight for a relaxed city schedule. It is also the period most likely to answer the question of when is the weather best in San Francisco without asking travelers to tolerate the year’s worst heat, cold, or wet weather.

When to Avoid San Francisco Because of Weather

Consider avoiding December if your trip depends on comfortable walking weather. These months are more likely to be too hot, too cold, too wet, too snowy, or simply less pleasant than the better parts of the year.

Families with kids, older travelers, photographers, and visitors who want to walk a lot should be especially careful with the worst weather months. Travelers who dislike heat should avoid the hottest stretch around August and September; travelers who dislike cold should avoid the coldest stretch around January, February, March, and December; travelers who dislike rain should be cautious around December.

Final Weather Verdict: When Should You Visit San Francisco?

The best month to visit San Francisco for weather is March. The worst month to visit San Francisco is December. The best season overall is usually Spring, while the best mild-weather period for a first-time visitor is March, April, and May.

If you want the best month to visit San Francisco, choose the month that gives you comfortable daytime temperatures and the lowest risk of weather disrupting outdoor plans. If you are comparing San Francisco weather by month, do not look only at the hottest month in San Francisco or the coldest month in San Francisco. Rain, snow, wind, humidity, and daylight can matter just as much.

For most travelers, the practical answer is simple: visit during the comfortable middle of the San Francisco seasons, avoid the most extreme month if you can, and pack for the specific weather pattern of your chosen dates.