Vacaville weather in August: Vacaville, California: normal highs, lows, rain and records for August
Vacaville in August has a normal high of 94°F and a normal low of 58°F, a daily mean of 76°F, holding near 94°F all month. Measurable precipitation falls on 0 days in a normal August, 0.02 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 34°C and low of 14°C, 1 mm of precipitation in August.
- NOAA stationVacaville Nut Tree Airport
- Station IDUSW00093241
- Location38.38°N 121.96°W
- Elevation109 ft (33 m)
- Population103,994
- Jan 58° 38°
- Feb 63° 40°
- Mar 68° 43°
- Apr 73° 46°
- May 81° 51°
- Jun 90° 56°
- Jul 95° 59°
- Aug 94° 58°
- Sep 91° 56°
- Oct 80° 49°
- Nov 67° 42°
- 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 Vacaville in August?
The normal high is 94°F and the normal low 58°F, for a daily mean of 75.9°F. August is 1.1°F cooler than July and 2.8°F warmer than September. August is the 2nd warmest month of the year in Vacaville and the 11th wettest. Across the month the normal high falls 2°F, from 95°F on August 1 to 93°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 74°F and 78°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 | 95°F | 59°F | 0% | 0% |
| August 8 | 94°F | 58°F | 1% | 0% |
| August 15 | 94°F | 58°F | 1% | 0% |
| August 22 | 94°F | 58°F | 1% | 0% |
| August 31 | 93°F | 57°F | 1% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 95°F | 59°F | 0% | 0% | 14 h 10 min |
| August 2 | 95°F | 59°F | 0% | 0% | 14 h 10 min |
| August 3 | 94°F | 59°F | 1% | 0% | 14 h 10 min |
| August 4 | 94°F | 59°F | 1% | 0% | 14 h |
| August 5 | 94°F | 58°F | 1% | 0% | 14 h |
| August 6 | 94°F | 58°F | 1% | 0% | 14 h |
| August 7 | 94°F | 58°F | 1% | 0% | 14 h |
| August 8 | 94°F | 58°F | 1% | 0% | 14 h |
| August 9 | 94°F | 58°F | 1% | 0% | 13 h 50 min |
| August 10 | 94°F | 58°F | 1% | 0% | 13 h 50 min |
| August 11 | 94°F | 58°F | 1% | 0% | 13 h 50 min |
| August 12 | 94°F | 58°F | 1% | 0% | 13 h 50 min |
| August 13 | 94°F | 58°F | 1% | 0% | 13 h 50 min |
| August 14 | 94°F | 58°F | 1% | 0% | 13 h 40 min |
| August 15 | 94°F | 58°F | 1% | 0% | 13 h 40 min |
| August 16 | 94°F | 58°F | 1% | 0% | 13 h 40 min |
| August 17 | 94°F | 58°F | 1% | 0% | 13 h 40 min |
| August 18 | 94°F | 58°F | 1% | 0% | 13 h 40 min |
| August 19 | 94°F | 58°F | 1% | 0% | 13 h 30 min |
| August 20 | 94°F | 58°F | 1% | 0% | 13 h 30 min |
| August 21 | 94°F | 58°F | 1% | 0% | 13 h 30 min |
| August 22 | 94°F | 58°F | 1% | 0% | 13 h 30 min |
| August 23 | 94°F | 58°F | 1% | 0% | 13 h 20 min |
| August 24 | 94°F | 58°F | 1% | 0% | 13 h 20 min |
| August 25 | 94°F | 58°F | 1% | 0% | 13 h 20 min |
| August 26 | 93°F | 58°F | 1% | 0% | 13 h 20 min |
| August 27 | 93°F | 57°F | 1% | 0% | 13 h 20 min |
| August 28 | 93°F | 57°F | 1% | 0% | 13 h 10 min |
| August 29 | 93°F | 57°F | 1% | 0% | 13 h 10 min |
| August 30 | 93°F | 57°F | 1% | 1% | 13 h 10 min |
| August 31 | 93°F | 57°F | 1% | 1% | 13 h 10 min |
- Normal high
- 94°FAugust average
- Normal low
- 58°FAugust average
- Precipitation
- 0.02 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 23
- 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
- 30
- Sunshine
- 98%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093241; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Vacaville in August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 31 (1%). In all, 0.02 in falls on 0 days of a normal August.
In a normal August in Vacaville, 23 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093241.
What are the records for August in Vacaville?
The warmest August temperature on this station's record (since 1998) is 111°F, on August 15, 2020; the coldest is 48°F, on August 23, 2002. The wettest August brought 0.37 in (2003).
The August mean against the 1991-2020 normal of 75.9°F: 2021 77.6°F (+1.7), 2022 79.0°F (+3.1), 2023 78.4°F (+2.5), 2024 76.7°F (+0.8), 2025 77.8°F (+1.9), 2026 77.5°F (+1.6). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.6°F | +1.7°F | 0.00 in |
| 2022 | 79.0°F | +3.1°F | 0.00 in |
| 2023 | 78.4°F | +2.5°F | 0.02 in |
| 2024 | 76.7°F | +0.8°F | 0.00 in |
| 2025 | 77.8°F | +1.9°F | 0.00 in |
| 2026 | 77.5°F | +1.6°F | 0.00 in |
Source: records: ACIS, station USW00093241; recent months: ACIS, station USW00093241. Records and recent months use complete months only.
How does August in Vacaville 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; Vacaville's is 94°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.