Clearlake weather in August: Clearlake, California: normal highs, lows, rain and records for August
Clearlake in August has a normal high of 91°F and a normal low of 54°F, a daily mean of 72°F, falling from 92°F on the 1st to 89°F by the 31st. Measurable precipitation falls on 0 days in a normal August, 0.09 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 12°C, 2 mm of precipitation in August.
- NOAA stationClearlake (4 mi SE)
- Station IDUSC00041806
- Location38.92°N 122.57°W
- Elevation1,349 ft (411 m)
- From the center4 miles
- Population16,636
- Jan 55° 33°
- Feb 58° 34°
- Mar 62° 35°
- Apr 66° 39°
- May 73° 45°
- Jun 83° 52°
- Jul 91° 56°
- Aug 91° 54°
- Sep 85° 50°
- Oct 75° 43°
- Nov 63° 36°
- Dec 55° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Clearlake in August?
The normal high is 91°F and the normal low 54°F, for a daily mean of 72.4°F. August is 1.2°F cooler than July and 4.5°F warmer than September. August is the 2nd warmest month of the year in Clearlake and the 11th wettest. Across the month the normal high falls 3°F, from 92°F on August 1 to 89°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 70°F and 75°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 | 92°F | 56°F | 1% | 0% |
| August 8 | 91°F | 55°F | 1% | 0% |
| August 15 | 91°F | 55°F | 1% | 1% |
| August 22 | 90°F | 54°F | 1% | 1% |
| August 31 | 89°F | 53°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 | 92°F | 56°F | 1% | 0% | 14 h 10 min |
| August 2 | 92°F | 56°F | 1% | 0% | 14 h 10 min |
| August 3 | 92°F | 56°F | 1% | 0% | 14 h 10 min |
| August 4 | 92°F | 56°F | 1% | 0% | 14 h 10 min |
| August 5 | 92°F | 56°F | 1% | 0% | 14 h 10 min |
| August 6 | 92°F | 56°F | 1% | 0% | 14 h |
| August 7 | 92°F | 55°F | 1% | 0% | 14 h |
| August 8 | 91°F | 55°F | 1% | 0% | 14 h |
| August 9 | 91°F | 55°F | 1% | 0% | 14 h |
| August 10 | 91°F | 55°F | 1% | 0% | 13 h 50 min |
| August 11 | 91°F | 55°F | 1% | 0% | 13 h 50 min |
| August 12 | 91°F | 55°F | 1% | 0% | 13 h 50 min |
| August 13 | 91°F | 55°F | 1% | 1% | 13 h 50 min |
| August 14 | 91°F | 55°F | 1% | 1% | 13 h 50 min |
| August 15 | 91°F | 55°F | 1% | 1% | 13 h 40 min |
| August 16 | 91°F | 54°F | 1% | 1% | 13 h 40 min |
| August 17 | 91°F | 54°F | 1% | 1% | 13 h 40 min |
| August 18 | 90°F | 54°F | 1% | 1% | 13 h 40 min |
| August 19 | 90°F | 54°F | 1% | 1% | 13 h 40 min |
| August 20 | 90°F | 54°F | 1% | 1% | 13 h 30 min |
| August 21 | 90°F | 54°F | 1% | 1% | 13 h 30 min |
| August 22 | 90°F | 54°F | 1% | 1% | 13 h 30 min |
| August 23 | 90°F | 53°F | 1% | 1% | 13 h 30 min |
| August 24 | 90°F | 53°F | 1% | 1% | 13 h 20 min |
| August 25 | 90°F | 53°F | 1% | 1% | 13 h 20 min |
| August 26 | 89°F | 53°F | 1% | 1% | 13 h 20 min |
| August 27 | 89°F | 53°F | 1% | 1% | 13 h 20 min |
| August 28 | 89°F | 53°F | 1% | 1% | 13 h 10 min |
| August 29 | 89°F | 53°F | 1% | 1% | 13 h 10 min |
| August 30 | 89°F | 53°F | 1% | 1% | 13 h 10 min |
| August 31 | 89°F | 53°F | 1% | 1% | 13 h 10 min |
- Normal high
- 91°FAugust average
- Normal low
- 54°FAugust average
- Precipitation
- 0.09 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 18
- 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
- 29
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00041806; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Clearlake 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, 0.09 in falls on 0 days of a normal August.
In a normal August in Clearlake, 18 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00041806.
What are the records for August in Clearlake?
The warmest August temperature on this station's record (since 1954) is 112°F, on August 9, 1978; the coldest is 40°F, on August 31, 1955. The wettest August brought 1.97 in (1965).
The August mean against the 1991-2020 normal of 72.4°F: 2022 75.5°F (+3.1), 2025 75.0°F (+2.6), 2026 75.3°F (+2.9). 3 of 3 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 75.5°F | +3.1°F | 0.03 in |
| 2025 | 75.0°F | +2.6°F | 0.00 in |
| 2026 | 75.3°F | +2.9°F | 0.00 in |
Source: records: ACIS, station USC00041806; recent months: ACIS, station USC00041806. Records and recent months use complete months only.
How does August in Clearlake 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; Clearlake's is 91°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.