Petaluma weather in August: Petaluma, California: normal highs, lows, rain and records for August
Petaluma in August has a normal high of 81°F and a normal low of 53°F, a daily mean of 67°F, rising from 81°F on the 1st to 82°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 27°C and low of 12°C, 1 mm of precipitation in August.
- NOAA stationPetaluma Airport
- Station IDUSC00046826
- Location38.26°N 122.61°W
- Elevation20 ft (6 m)
- Population59,393
- Jan 58° 39°
- Feb 61° 40°
- Mar 65° 42°
- Apr 68° 44°
- May 72° 47°
- Jun 78° 50°
- Jul 81° 52°
- Aug 81° 53°
- Sep 82° 51°
- Oct 76° 48°
- Nov 66° 42°
- Dec 58° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Petaluma in August?
The normal high is 81°F and the normal low 53°F, for a daily mean of 67.0°F. August is 0.4°F warmer than July and 0.5°F warmer than September. August is the warmest month of the year in Petaluma 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 1.3°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 66°F and 68°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 2%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 81°F | 53°F | 1% | 0% |
| August 8 | 81°F | 53°F | 1% | 0% |
| August 15 | 81°F | 53°F | 1% | 0% |
| August 22 | 82°F | 53°F | 1% | 0% |
| August 31 | 82°F | 52°F | 2% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 29, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 81°F | 53°F | 1% | 0% | 14 h 10 min |
| August 2 | 81°F | 53°F | 1% | 0% | 14 h 10 min |
| August 3 | 81°F | 53°F | 1% | 0% | 14 h 10 min |
| August 4 | 81°F | 53°F | 1% | 0% | 14 h |
| August 5 | 81°F | 53°F | 1% | 0% | 14 h |
| August 6 | 81°F | 53°F | 1% | 0% | 14 h |
| August 7 | 81°F | 53°F | 1% | 0% | 14 h |
| August 8 | 81°F | 53°F | 1% | 0% | 14 h |
| August 9 | 81°F | 53°F | 1% | 0% | 13 h 50 min |
| August 10 | 81°F | 53°F | 1% | 0% | 13 h 50 min |
| August 11 | 81°F | 53°F | 1% | 0% | 13 h 50 min |
| August 12 | 81°F | 53°F | 1% | 0% | 13 h 50 min |
| August 13 | 81°F | 53°F | 1% | 0% | 13 h 50 min |
| August 14 | 81°F | 53°F | 1% | 0% | 13 h 40 min |
| August 15 | 81°F | 53°F | 1% | 0% | 13 h 40 min |
| August 16 | 81°F | 53°F | 1% | 0% | 13 h 40 min |
| August 17 | 81°F | 53°F | 1% | 0% | 13 h 40 min |
| August 18 | 81°F | 53°F | 1% | 0% | 13 h 40 min |
| August 19 | 81°F | 53°F | 1% | 0% | 13 h 30 min |
| August 20 | 81°F | 53°F | 1% | 0% | 13 h 30 min |
| August 21 | 82°F | 53°F | 1% | 0% | 13 h 30 min |
| August 22 | 82°F | 53°F | 1% | 0% | 13 h 30 min |
| August 23 | 82°F | 53°F | 1% | 0% | 13 h 20 min |
| August 24 | 82°F | 53°F | 2% | 0% | 13 h 20 min |
| August 25 | 82°F | 53°F | 2% | 0% | 13 h 20 min |
| August 26 | 82°F | 53°F | 2% | 0% | 13 h 20 min |
| August 27 | 82°F | 53°F | 2% | 0% | 13 h 10 min |
| August 28 | 82°F | 53°F | 2% | 1% | 13 h 10 min |
| August 29 | 82°F | 53°F | 2% | 1% | 13 h 10 min |
| August 30 | 82°F | 53°F | 2% | 1% | 13 h 10 min |
| August 31 | 82°F | 52°F | 2% | 1% | 13 h 10 min |
- Normal high
- 81°FAugust average
- Normal low
- 53°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
- 31
- Days at 80°F or more
- 18
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00046826; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Petaluma in August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 30 (2%). In all, 0.05 in falls on 0 days of a normal August.
In a normal August in Petaluma, 4 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00046826.
What are the records for August in Petaluma?
The warmest August temperature on this station's record (since 1893) is 105°F, on August 31, 1950; the coldest is 39°F, on August 5, 1916. The wettest August brought 1.04 in (1997).
The August mean against the 1991-2020 normal of 67.0°F: 2021 68.0°F (+1.0), 2022 69.3°F (+2.3), 2023 70.5°F (+3.5), 2024 67.8°F (+0.8), 2025 68.3°F (+1.3), 2026 67.8°F (+0.8). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.0°F | +1.0°F | 0.00 in |
| 2022 | 69.3°F | +2.3°F | 0.03 in |
| 2023 | 70.5°F | +3.5°F | 0.00 in |
| 2024 | 67.8°F | +0.8°F | 0.00 in |
| 2025 | 68.3°F | +1.3°F | 0.00 in |
| 2026 | 67.8°F | +0.8°F | 0.00 in |
Source: records: ACIS, station USC00046826; recent months: ACIS, station USC00046826. Records and recent months use complete months only.
How does August in Petaluma 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; Petaluma's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.