San Francisco weather in August: San Francisco, California: normal highs, lows, rain and records for August
San Francisco in August has a normal high of 68°F and a normal low of 56°F, a daily mean of 62°F, rising from 66°F on the 1st to 69°F by the 31st. Measurable precipitation falls on 1 days in a normal August, 0.06 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 13°C, 2 mm of precipitation in August.
- NOAA stationSan Francisco Downtown
- Station IDUSW00023272
- Location37.77°N 122.43°W
- Elevation150 ft (46 m)
- Population827,526
- Jan 58° 47°
- Feb 60° 48°
- Mar 62° 49°
- Apr 63° 50°
- May 64° 51°
- Jun 67° 53°
- Jul 66° 54°
- Aug 68° 56°
- Sep 70° 56°
- Oct 70° 54°
- Nov 64° 51°
- Dec 58° 47°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Francisco in August?
The normal high is 68°F and the normal low 56°F, for a daily mean of 61.7°F. August is 1.4°F warmer than July and 1.2°F cooler than September. August is the 3rd warmest month of the year in San Francisco and the 11th wettest. Across the month the normal high rises 3°F, from 66°F on August 1 to 69°F on August 31. From one year to the next August's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 60°F and 63°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 3%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 66°F | 55°F | 3% | 0% |
| August 8 | 67°F | 55°F | 3% | 0% |
| August 15 | 68°F | 56°F | 3% | 1% |
| August 22 | 69°F | 56°F | 3% | 1% |
| August 31 | 69°F | 56°F | 3% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 31, coldest night August 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 66°F | 55°F | 3% | 0% | 14 h 10 min |
| August 2 | 67°F | 55°F | 3% | 0% | 14 h 10 min |
| August 3 | 67°F | 55°F | 3% | 0% | 14 h |
| August 4 | 67°F | 55°F | 3% | 0% | 14 h |
| August 5 | 67°F | 55°F | 3% | 0% | 14 h |
| August 6 | 67°F | 55°F | 3% | 0% | 14 h |
| August 7 | 67°F | 55°F | 3% | 0% | 14 h |
| August 8 | 67°F | 55°F | 3% | 0% | 13 h 50 min |
| August 9 | 67°F | 55°F | 3% | 0% | 13 h 50 min |
| August 10 | 67°F | 55°F | 3% | 0% | 13 h 50 min |
| August 11 | 67°F | 56°F | 3% | 0% | 13 h 50 min |
| August 12 | 67°F | 56°F | 3% | 0% | 13 h 50 min |
| August 13 | 68°F | 56°F | 3% | 1% | 13 h 40 min |
| August 14 | 68°F | 56°F | 3% | 1% | 13 h 40 min |
| August 15 | 68°F | 56°F | 3% | 1% | 13 h 40 min |
| August 16 | 68°F | 56°F | 3% | 1% | 13 h 40 min |
| August 17 | 68°F | 56°F | 3% | 1% | 13 h 40 min |
| August 18 | 68°F | 56°F | 3% | 1% | 13 h 30 min |
| August 19 | 68°F | 56°F | 3% | 1% | 13 h 30 min |
| August 20 | 68°F | 56°F | 3% | 1% | 13 h 30 min |
| August 21 | 69°F | 56°F | 3% | 1% | 13 h 30 min |
| August 22 | 69°F | 56°F | 3% | 1% | 13 h 20 min |
| August 23 | 69°F | 56°F | 3% | 1% | 13 h 20 min |
| August 24 | 69°F | 56°F | 3% | 1% | 13 h 20 min |
| August 25 | 69°F | 56°F | 3% | 1% | 13 h 20 min |
| August 26 | 69°F | 56°F | 3% | 1% | 13 h 20 min |
| August 27 | 69°F | 56°F | 3% | 1% | 13 h 10 min |
| August 28 | 69°F | 56°F | 3% | 1% | 13 h 10 min |
| August 29 | 69°F | 56°F | 3% | 1% | 13 h 10 min |
| August 30 | 69°F | 56°F | 3% | 1% | 13 h 10 min |
| August 31 | 69°F | 56°F | 3% | 1% | 13 h |
- Normal high
- 68°FAugust average
- Normal low
- 56°FAugust average
- Precipitation
- 0.06 inmonth total
- Days with precipitation
- 10.01 inch or more
- Daylight
- 14 h 10 min to 13 hAugust 1 to August 31
- Days at 70°F or more
- 10
- Days at 80°F or more
- 2
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023272; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Francisco in August?
On a given August day the chance of 0.01 inch or more is 3% on average, highest around August 2 (3%). In all, 0.06 in falls on 1 days of a normal August.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023272.
What are the records for August in San Francisco?
The warmest August temperature on this station's record (since 1874) is 98°F, on August 24, 2010; the coldest is 46°F, on August 8, 1903. The wettest August brought 0.80 in (1976).
The August mean against the 1991-2020 normal of 61.7°F: 2021 62.0°F (+0.3), 2022 63.2°F (+1.5), 2023 64.1°F (+2.4), 2024 62.0°F (+0.3), 2026 61.9°F (+0.2). 5 of 5 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.0°F | +0.3°F | 0.05 in |
| 2022 | 63.2°F | +1.5°F | 0.00 in |
| 2023 | 64.1°F | +2.4°F | 0.00 in |
| 2024 | 62.0°F | +0.3°F | 0.04 in |
| 2026 | 61.9°F | +0.2°F | 0.02 in |
Source: records: ACIS, station USW00023272; recent months: ACIS, station USW00023272. Records and recent months use complete months only.
How does August in San Francisco compare across California?
Across the 219 places PlainClimate covers in California, August normal highs run from 63°F in Bodega to 109°F in Needles; San Francisco's is 68°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- San Francisco in July66°F by day, 54°F at night
- San Francisco in September70°F by day, 56°F at night
- San Francisco through the yearEvery month, frost dates, records and recent years
- California in AugustThe statewide normal and the warmest and coolest places
- Needles: California's warmest Augustnormal high 109°F