July brings 21°C daytime highs, 0mm of precipitation across about 0 wet days and 14.3 hours of daylight — best for hiking, cycling and reliable sunshine. The strongest run of the year is July to September. January is the quietest month: quiet and local, and still good for low-angle light and quiet and local.
Long-run climate normals for San Francisco. Month ratings compare months within San Francisco only — they are not a ranking of San Francisco against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | July — Hiking, Cycling, Reliable sunshine |
| Best 3-month window | July–September |
| Quietest month | January — Quiet and local |
| Driest month | July — 0mm |
| Wettest month | January — 114mm |
| Warmest / coolest | July 21°C / February 14°C |
| Seasonality | Strongly seasonal — the months feel like different places |
| Annual rainfall | 508mm over roughly 67 rain days |
Daytime highs only move 7°C across the whole year (14–21°C), so timing matters far less here than rainfall does.
June gives you 14.6 hours of daylight against just 9.4 in December — a 5-hour difference in how much you can actually fit into a day.
July is the driest month at 0mm across roughly 0 wet days, while January peaks at 114mm.
August is almost as good as July, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
San Francisco changes character completely through the year — July and January are effectively two different destinations. Pick the month that matches what you want to do, not the highest-rated one.
Ratings compare months within San Francisco, not against destinations worldwide: five stars means the best time to be here, not that San Francisco beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★☆☆☆ | 14°C / 8°C | 114mm | 15 | 3h | 9.7h | Low-angle light · Quiet and local |
| February | ★★☆☆☆ | 14°C / 8°C | 97mm | 13 | 3h | 10.6h | Hiking · Cycling · Low-angle light |
| March | ★★☆☆☆ | 15°C / 9°C | 79mm | 10 | 3h | 11.8h | Hiking · Cycling · Spring greenery |
| April | ★★★★☆ | 17°C / 10°C | 37mm | 5 | 6h | 13h | Hiking · Cycling · Spring greenery |
| May | ★★★★☆ | 18°C / 11°C | 18mm | 2 | 6h | 14.1h | Hiking · Cycling · Spring greenery |
| June | ★★★★★ | 20°C / 12°C | 4mm | 1 | 7h | 14.6h | Hiking · Cycling |
| July | ★★★★★ | 21°C / 13°C | 0mm | 0 | 11h | 14.3h | Hiking · Cycling · Reliable sunshine |
| August | ★★★★★ | 21°C / 13°C | 1mm | 1 | 11h | 13.4h | Hiking · Cycling · Reliable sunshine |
| September | ★★★★★ | 20°C / 12°C | 5mm | 1 | 11h | 12.2h | Hiking · Cycling · Reliable sunshine |
| October | ★★★★☆ | 18°C / 11°C | 25mm | 3 | 10h | 11h | Hiking · Cycling · Reliable sunshine |
| November | ★★★☆☆ | 17°C / 10°C | 52mm | 7 | 6h | 9.9h | Hiking · Cycling · Autumn colour |
| December | ★★☆☆☆ | 15°C / 9°C | 84mm | 11 | 3h | 9.4h | Hiking · Cycling · Low-angle light |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | July | 11h daily sunshine, 21°C highs and only 0 rain days. |
| City walking & sightseeing | July | 21°C highs with 14.3h of daylight — long days without heat fatigue. |
| Photography & light | July | 11h of sun and 14.3h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | June | Scores 89/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | April | 17°C highs and 10°C nights suit anyone who dislikes heat. |
Each month in San Francisco is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
July is the best all-round month in San Francisco: 21°C highs, 0mm of precipitation and 14.3 hours of daylight, which suits hiking, cycling and reliable sunshine. The strongest three-month window is July to September.
January — 14°C highs, 114mm of precipitation over roughly 15 days and 9.7 hours of daylight. It is the cheapest and least crowded time to go, and it still works for low-angle light and quiet and local.
July is the driest month at 0mm over about 0 rain days, against 114mm in January. Across the year San Francisco records around 508mm.
Yes, but the months are genuinely different trips. July suits hiking, cycling and reliable sunshine, while January suits low-angle light and quiet and local. Pick the month that matches what you want to do.
Daylight ranges from 9.4 hours in December to 14.6 hours in June, calculated from the city's latitude.