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San Francisco’s weather is hard to sum up in one number. NOAA’s official monthly normals for downtown show a narrow range: the warmest month averages a high of 70 degrees and the coolest month a low of 47.
The table below is NOAA’s own data for two stations, side by side. It is a guide for packing and planning, not a forecast.
Read from NOAA’s National Centers for Environmental Information monthly normals files on . The numbers in this page were filled in by a script from those files; none was typed by hand.
The Numbers, Month by Month
Two NOAA stations. Downtown is NOAA’s San Francisco Downtown station (elevation 46 ft). Airport is San Francisco International Airport (elevation 2 ft). Neither is on the ocean side of the city.
| Month | Downtown High / Low | Downtown Rain | Airport High / Low | Airport Rain |
|---|---|---|---|---|
| January | 58 / 47 °F | 4.40 in | 58 / 44 °F | 3.89 in |
| February | 60 / 48 °F | 4.37 in | 61 / 46 °F | 3.96 in |
| March | 62 / 49 °F | 3.15 in | 63 / 48 °F | 2.73 in |
| April | 63 / 50 °F | 1.60 in | 66 / 49 °F | 1.36 in |
| May | 64 / 51 °F | 0.70 in | 68 / 52 °F | 0.48 in |
| June | 66 / 53 °F | 0.20 in | 72 / 54 °F | 0.14 in |
| July | 66 / 54 °F | 0.01 in | 73 / 55 °F | 0.00 in |
| August | 68 / 56 °F | 0.06 in | 73 / 56 °F | 0.04 in |
| September | 70 / 56 °F | 0.10 in | 75 / 56 °F | 0.07 in |
| October | 70 / 54 °F | 0.94 in | 72 / 53 °F | 0.79 in |
| November | 64 / 51 °F | 2.60 in | 64 / 48 °F | 2.04 in |
| December | 58 / 47 °F | 4.76 in | 58 / 45 °F | 4.14 in |
Highs and lows are the average daily high and the average daily low for each month. Rain is the average monthly total. NOAA calls these 30-year normals: an average over 1991 to 2020, not what will happen this month.
How to Use This
- For what to pack, start with our packing list by month and the what to wear guide.
- For today and the next week, use the National Weather Service forecast for the Bay Area (linked in the sources) and our fog forecast page.
- For how much a day can differ from block to block, see the microclimate tracker.