Riverside weather in August: Riverside, California: normal highs, lows, rain and records for August
Riverside in August has a normal high of 95°F and a normal low of 65°F, a daily mean of 80°F, holding near 95°F all month. Measurable precipitation falls on 1 days in a normal August, 0.02 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 35°C and low of 18°C, 1 mm of precipitation in August.
- NOAA stationRiverside Municipal Airport
- Station IDUSW00003171
- Location33.95°N 117.44°W
- Elevation805 ft (245 m)
- From the center3 miles
- Population323,757
- Jan 68° 44°
- Feb 68° 45°
- Mar 72° 47°
- Apr 76° 50°
- May 80° 55°
- Jun 87° 59°
- Jul 93° 64°
- Aug 95° 65°
- Sep 91° 62°
- Oct 83° 55°
- Nov 75° 47°
- Dec 67° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Riverside in August?
The normal high is 95°F and the normal low 65°F, for a daily mean of 79.8°F. August is 1.2°F warmer than July and 3.2°F warmer than September. August is the warmest month of the year in Riverside and the 11th wettest. From one year to the next August's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 78°F and 82°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 | 95°F | 65°F | 2% | 1% |
| August 8 | 95°F | 65°F | 2% | 0% |
| August 15 | 95°F | 65°F | 2% | 0% |
| August 22 | 95°F | 65°F | 2% | 0% |
| August 31 | 95°F | 64°F | 2% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 21, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 95°F | 65°F | 2% | 1% | 13 h 50 min |
| August 2 | 95°F | 65°F | 2% | 1% | 13 h 50 min |
| August 3 | 95°F | 65°F | 2% | 0% | 13 h 50 min |
| August 4 | 95°F | 65°F | 2% | 0% | 13 h 50 min |
| August 5 | 95°F | 65°F | 2% | 0% | 13 h 40 min |
| August 6 | 95°F | 65°F | 2% | 0% | 13 h 40 min |
| August 7 | 95°F | 65°F | 2% | 0% | 13 h 40 min |
| August 8 | 95°F | 65°F | 2% | 0% | 13 h 40 min |
| August 9 | 95°F | 65°F | 2% | 0% | 13 h 40 min |
| August 10 | 95°F | 65°F | 2% | 0% | 13 h 40 min |
| August 11 | 95°F | 65°F | 2% | 0% | 13 h 30 min |
| August 12 | 95°F | 65°F | 2% | 0% | 13 h 30 min |
| August 13 | 95°F | 65°F | 2% | 0% | 13 h 30 min |
| August 14 | 95°F | 65°F | 2% | 0% | 13 h 30 min |
| August 15 | 95°F | 65°F | 2% | 0% | 13 h 30 min |
| August 16 | 95°F | 65°F | 2% | 0% | 13 h 30 min |
| August 17 | 95°F | 65°F | 2% | 0% | 13 h 20 min |
| August 18 | 95°F | 65°F | 2% | 0% | 13 h 20 min |
| August 19 | 95°F | 65°F | 2% | 0% | 13 h 20 min |
| August 20 | 95°F | 65°F | 2% | 0% | 13 h 20 min |
| August 21 | 95°F | 65°F | 2% | 0% | 13 h 20 min |
| August 22 | 95°F | 65°F | 2% | 0% | 13 h 10 min |
| August 23 | 95°F | 65°F | 2% | 0% | 13 h 10 min |
| August 24 | 95°F | 65°F | 2% | 0% | 13 h 10 min |
| August 25 | 95°F | 64°F | 2% | 0% | 13 h 10 min |
| August 26 | 95°F | 64°F | 2% | 0% | 13 h 10 min |
| August 27 | 95°F | 64°F | 2% | 0% | 13 h |
| August 28 | 95°F | 64°F | 2% | 0% | 13 h |
| August 29 | 95°F | 64°F | 2% | 0% | 13 h |
| August 30 | 95°F | 64°F | 2% | 1% | 13 h |
| August 31 | 95°F | 64°F | 2% | 1% | 13 h |
- Normal high
- 95°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 0.02 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 25
- Daylight
- 13 h 50 min to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 31
- Sunshine
- 92%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003171; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Riverside in August?
On a given August day the chance of 0.01 inch or more is 2% on average, highest around August 1 (2%). In all, 0.02 in falls on 1 days of a normal August.
In a normal August in Riverside, 25 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003171.
What are the records for August in Riverside?
The warmest August temperature on Riverside's official record (since 1893) is 113°F, on August 24, 1926; the coldest is 40°F, on August 27, 1902. The wettest August brought 2.33 in (1983).
The August mean against the 1991-2020 normal of 79.8°F: 2021 80.1°F (+0.3), 2022 83.0°F (+3.2), 2023 80.9°F (+1.1), 2024 81.2°F (+1.4), 2025 81.0°F (+1.2), 2026 84.3°F (+4.5). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 80.1°F | +0.3°F | 0.00 in |
| 2022 | 83.0°F | +3.2°F | 0.00 in |
| 2023 | 80.9°F | +1.1°F | 1.99 in |
| 2024 | 81.2°F | +1.4°F | 0.00 in |
| 2025 | 81.0°F | +1.2°F | 0.00 in |
| 2026 | 84.3°F | +4.5°F | 0.00 in |
Source: records: ACIS, NWS threaded record RALthr; recent months: ACIS, station USW00003171. Records and recent months use complete months only.
How does August in Riverside 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; Riverside's is 95°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.