Santa Rosa weather in August: Santa Rosa, California: normal highs, lows, rain and records for August
Santa Rosa in August has a normal high of 84°F and a normal low of 52°F, a daily mean of 68°F, rising from 83°F on the 1st to 85°F by the 31st. 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 29°C and low of 11°C, 1 mm of precipitation in August.
- NOAA stationSanta Rosa Sonoma County Airport
- Station IDUSW00023213
- Location38.50°N 122.81°W
- Elevation114 ft (35 m)
- Population177,524
- Jan 58° 38°
- Feb 62° 39°
- Mar 65° 41°
- Apr 69° 43°
- May 75° 47°
- Jun 82° 50°
- Jul 84° 52°
- Aug 84° 52°
- Sep 83° 50°
- Oct 77° 46°
- Nov 65° 40°
- Dec 58° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Santa Rosa in August?
The normal high is 84°F and the normal low 52°F, for a daily mean of 68.0°F. August is 0.4°F warmer than July and 1.5°F warmer than September. August is the warmest month of the year in Santa Rosa and the 11th wettest. Across the month the normal high rises 2°F, from 83°F on August 1 to 85°F on August 31. From one year to the next August's mean temperature typically moves about 1.3°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 69°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 | 83°F | 52°F | 1% | 0% |
| August 8 | 84°F | 52°F | 1% | 0% |
| August 15 | 84°F | 52°F | 1% | – |
| August 22 | 85°F | 52°F | 1% | – |
| August 31 | 85°F | 51°F | 3% | – |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 26, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 83°F | 52°F | 1% | 0% | 14 h 10 min |
| August 2 | 83°F | 52°F | 1% | 0% | 14 h 10 min |
| August 3 | 83°F | 52°F | 1% | 0% | 14 h 10 min |
| August 4 | 83°F | 52°F | 1% | 0% | 14 h 10 min |
| August 5 | 83°F | 52°F | 1% | 0% | 14 h |
| August 6 | 83°F | 52°F | 1% | 0% | 14 h |
| August 7 | 84°F | 52°F | 1% | 0% | 14 h |
| August 8 | 84°F | 52°F | 1% | 0% | 14 h |
| August 9 | 84°F | 52°F | 1% | 0% | 14 h |
| August 10 | 84°F | 52°F | 1% | – | 13 h 50 min |
| August 11 | 84°F | 52°F | 1% | – | 13 h 50 min |
| August 12 | 84°F | 52°F | 1% | – | 13 h 50 min |
| August 13 | 84°F | 52°F | 1% | – | 13 h 50 min |
| August 14 | 84°F | 52°F | 1% | – | 13 h 40 min |
| August 15 | 84°F | 52°F | 1% | – | 13 h 40 min |
| August 16 | 84°F | 52°F | 1% | – | 13 h 40 min |
| August 17 | 84°F | 52°F | 1% | – | 13 h 40 min |
| August 18 | 84°F | 52°F | 1% | – | 13 h 40 min |
| August 19 | 84°F | 52°F | 1% | – | 13 h 30 min |
| August 20 | 85°F | 52°F | 1% | – | 13 h 30 min |
| August 21 | 85°F | 52°F | 1% | – | 13 h 30 min |
| August 22 | 85°F | 52°F | 1% | – | 13 h 30 min |
| August 23 | 85°F | 52°F | 1% | – | 13 h 20 min |
| August 24 | 85°F | 52°F | 2% | – | 13 h 20 min |
| August 25 | 85°F | 52°F | 2% | – | 13 h 20 min |
| August 26 | 85°F | 52°F | 2% | – | 13 h 20 min |
| August 27 | 85°F | 51°F | 2% | – | 13 h 20 min |
| August 28 | 85°F | 51°F | 2% | – | 13 h 10 min |
| August 29 | 85°F | 51°F | 2% | – | 13 h 10 min |
| August 30 | 85°F | 51°F | 2% | – | 13 h 10 min |
| August 31 | 85°F | 51°F | 3% | – | 13 h 10 min |
- Normal high
- 84°FAugust average
- Normal low
- 52°FAugust average
- Precipitation
- 0.05 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 7
- Daylight
- 14 h 10 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 21
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023213; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Santa Rosa in August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 31 (3%). In all, 0.05 in falls on 0 days of a normal August.
In a normal August in Santa Rosa, 7 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023213.
What are the records for August in Santa Rosa?
The warmest August temperature on this station's record (since 1998) is 107°F, on August 24, 2010; the coldest is 42°F, on August 30, 2010. The wettest August brought 0.09 in (2020).
The August mean against the 1991-2020 normal of 68.0°F: 2021 67.4°F (−0.6), 2022 69.5°F (+1.5), 2023 71.0°F (+3.0), 2024 69.2°F (+1.2), 2025 69.9°F (+1.9), 2026 68.5°F (+0.5). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.4°F | −0.6°F | 0.00 in |
| 2022 | 69.5°F | +1.5°F | 0.00 in |
| 2023 | 71.0°F | +3.0°F | 0.00 in |
| 2024 | 69.2°F | +1.2°F | 0.08 in |
| 2025 | 69.9°F | +1.9°F | 0.00 in |
| 2026 | 68.5°F | +0.5°F | 0.00 in |
Source: records: ACIS, station USW00023213; recent months: ACIS, station USW00023213. Records and recent months use complete months only.
How does August in Santa Rosa 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; Santa Rosa's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.