San Rafael weather in August: San Rafael, California: normal highs, lows, rain and records for August
San Rafael in August has a normal high of 81°F and a normal low of 56°F, a daily mean of 68°F, holding near 81°F all month. Measurable precipitation falls on 0 days in a normal August, 0.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 13°C, 1 mm of precipitation in August.
- NOAA stationSan Rafael Civic Center
- Station IDUSC00047880
- Location38.00°N 122.54°W
- Elevation120 ft (37 m)
- From the center2 miles
- Population59,961
- Jan 57° 43°
- Feb 61° 44°
- Mar 65° 46°
- Apr 68° 48°
- May 72° 51°
- Jun 78° 54°
- Jul 81° 55°
- Aug 81° 56°
- Sep 81° 54°
- Oct 75° 51°
- Nov 65° 46°
- Dec 57° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Rafael in August?
The normal high is 81°F and the normal low 56°F, for a daily mean of 68.4°F. August is 0.5°F warmer than July and 0.8°F warmer than September. August is the warmest month of the year in San Rafael and the 11th wettest. Across the month the normal high rises 1°F, from 81°F on August 1 to 82°F on August 31. From one year to the next August's mean temperature typically moves about 1.5°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 70°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 1%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 81°F | 55°F | 0% | 0% |
| August 8 | 81°F | 56°F | 1% | 0% |
| August 15 | 81°F | 56°F | 1% | 0% |
| August 22 | 82°F | 56°F | 1% | 0% |
| August 31 | 82°F | 55°F | 1% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 25, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 81°F | 55°F | 0% | 0% | 14 h 10 min |
| August 2 | 81°F | 56°F | 0% | 0% | 14 h 10 min |
| August 3 | 81°F | 56°F | 0% | 0% | 14 h |
| August 4 | 81°F | 56°F | 0% | 0% | 14 h |
| August 5 | 81°F | 56°F | 0% | 0% | 14 h |
| August 6 | 81°F | 56°F | 1% | 0% | 14 h |
| August 7 | 81°F | 56°F | 1% | 0% | 14 h |
| August 8 | 81°F | 56°F | 1% | 0% | 14 h |
| August 9 | 81°F | 56°F | 1% | 0% | 13 h 50 min |
| August 10 | 81°F | 56°F | 1% | 0% | 13 h 50 min |
| August 11 | 81°F | 56°F | 1% | 0% | 13 h 50 min |
| August 12 | 81°F | 56°F | 1% | 0% | 13 h 50 min |
| August 13 | 81°F | 56°F | 1% | 0% | 13 h 50 min |
| August 14 | 81°F | 56°F | 1% | 0% | 13 h 40 min |
| August 15 | 81°F | 56°F | 1% | 0% | 13 h 40 min |
| August 16 | 81°F | 56°F | 1% | 0% | 13 h 40 min |
| August 17 | 81°F | 56°F | 1% | 0% | 13 h 40 min |
| August 18 | 81°F | 56°F | 1% | 0% | 13 h 30 min |
| August 19 | 81°F | 56°F | 1% | 0% | 13 h 30 min |
| August 20 | 81°F | 56°F | 1% | 0% | 13 h 30 min |
| August 21 | 82°F | 56°F | 1% | 0% | 13 h 30 min |
| August 22 | 82°F | 56°F | 1% | 0% | 13 h 30 min |
| August 23 | 82°F | 56°F | 1% | 0% | 13 h 20 min |
| August 24 | 82°F | 56°F | 1% | 0% | 13 h 20 min |
| August 25 | 82°F | 55°F | 1% | 0% | 13 h 20 min |
| August 26 | 82°F | 55°F | 1% | 0% | 13 h 20 min |
| August 27 | 82°F | 55°F | 1% | 0% | 13 h 10 min |
| August 28 | 82°F | 55°F | 1% | 0% | 13 h 10 min |
| August 29 | 82°F | 55°F | 1% | 1% | 13 h 10 min |
| August 30 | 82°F | 55°F | 1% | 1% | 13 h 10 min |
| August 31 | 82°F | 55°F | 1% | 1% | 13 h 10 min |
- Normal high
- 81°FAugust average
- Normal low
- 56°FAugust average
- Precipitation
- 0.05 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 4
- Daylight
- 14 h 10 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 15
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00047880; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Rafael in August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 30 (1%). In all, 0.05 in falls on 0 days of a normal August.
In a normal August in San Rafael, 4 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00047880.
What are the records for August in San Rafael?
The warmest August temperature on this station's record (since 1894) is 105°F, on August 3, 1998; the coldest is 40°F, on August 27, 1992. The wettest August brought 1.07 in (1997).
The August mean against the 1991-2020 normal of 68.4°F: 2023 71.9°F (+3.5), 2024 69.6°F (+1.2), 2025 71.8°F (+3.4), 2026 69.3°F (+0.9). 4 of 4 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2023 | 71.9°F | +3.5°F | 0.00 in |
| 2024 | 69.6°F | +1.2°F | 0.00 in |
| 2025 | 71.8°F | +3.4°F | 0.00 in |
| 2026 | 69.3°F | +0.9°F | 0.00 in |
Source: records: ACIS, station USC00047880; recent months: ACIS, station USC00047880. Records and recent months use complete months only.
How does August in San Rafael 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 Rafael's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.