San Luis Obispo weather in August: San Luis Obispo, California: normal highs, lows, rain and records for August
San Luis Obispo in August has a normal high of 79°F and a normal low of 55°F, a daily mean of 67°F, holding near 79°F all month. Measurable precipitation falls on 1 days in a normal August, 0.01 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 13°C, 0 mm of precipitation in August.
- NOAA stationSan Luis Obispo Airport
- Station IDUSW00093206
- Location35.24°N 120.64°W
- Elevation200 ft (61 m)
- Population49,729
- Jan 65° 41°
- Feb 65° 42°
- Mar 67° 45°
- Apr 69° 46°
- May 72° 48°
- Jun 75° 51°
- Jul 78° 54°
- Aug 79° 55°
- Sep 80° 53°
- Oct 77° 50°
- Nov 71° 45°
- Dec 65° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Luis Obispo in August?
The normal high is 79°F and the normal low 55°F, for a daily mean of 67.1°F. August is 1.0°F warmer than July and 0.7°F warmer than September. August is the warmest month of the year in San Luis Obispo and the 12th wettest. Across the month the normal high rises 1°F, from 79°F on August 1 to 80°F on August 31. From one year to the next August's mean temperature typically moves about 1.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 66°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 2%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 79°F | 55°F | 1% | 0% |
| August 8 | 79°F | 55°F | 1% | 0% |
| August 15 | 79°F | 55°F | 1% | 0% |
| August 22 | 80°F | 55°F | 2% | 0% |
| August 31 | 80°F | 55°F | 2% | 0% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 28, coldest night August 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 79°F | 55°F | 1% | 0% | 14 h |
| August 2 | 79°F | 55°F | 1% | 0% | 13 h 50 min |
| August 3 | 79°F | 55°F | 1% | 0% | 13 h 50 min |
| August 4 | 79°F | 55°F | 1% | 0% | 13 h 50 min |
| August 5 | 79°F | 55°F | 1% | 0% | 13 h 50 min |
| August 6 | 79°F | 55°F | 1% | 0% | 13 h 50 min |
| August 7 | 79°F | 55°F | 1% | 0% | 13 h 50 min |
| August 8 | 79°F | 55°F | 1% | 0% | 13 h 40 min |
| August 9 | 79°F | 55°F | 1% | 0% | 13 h 40 min |
| August 10 | 79°F | 55°F | 1% | 0% | 13 h 40 min |
| August 11 | 79°F | 55°F | 1% | 0% | 13 h 40 min |
| August 12 | 79°F | 55°F | 1% | 0% | 13 h 40 min |
| August 13 | 79°F | 55°F | 1% | 0% | 13 h 40 min |
| August 14 | 79°F | 55°F | 1% | 0% | 13 h 30 min |
| August 15 | 79°F | 55°F | 1% | 0% | 13 h 30 min |
| August 16 | 79°F | 55°F | 1% | 0% | 13 h 30 min |
| August 17 | 79°F | 55°F | 1% | 0% | 13 h 30 min |
| August 18 | 79°F | 55°F | 1% | 0% | 13 h 30 min |
| August 19 | 79°F | 55°F | 1% | 0% | 13 h 20 min |
| August 20 | 80°F | 55°F | 1% | 0% | 13 h 20 min |
| August 21 | 80°F | 55°F | 1% | 0% | 13 h 20 min |
| August 22 | 80°F | 55°F | 2% | 0% | 13 h 20 min |
| August 23 | 80°F | 55°F | 2% | 0% | 13 h 20 min |
| August 24 | 80°F | 55°F | 2% | 0% | 13 h 10 min |
| August 25 | 80°F | 55°F | 2% | 0% | 13 h 10 min |
| August 26 | 80°F | 55°F | 2% | 0% | 13 h 10 min |
| August 27 | 80°F | 55°F | 2% | 0% | 13 h 10 min |
| August 28 | 80°F | 55°F | 2% | 0% | 13 h 10 min |
| August 29 | 80°F | 55°F | 2% | 0% | 13 h |
| August 30 | 80°F | 55°F | 2% | 0% | 13 h |
| August 31 | 80°F | 55°F | 2% | 0% | 13 h |
- Normal high
- 79°FAugust average
- Normal low
- 55°FAugust average
- Precipitation
- 0.01 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 14 h to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 13
- Sunshine
- 95%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093206; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Luis Obispo in August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 31 (2%). In all, 0.01 in falls on 1 days of a normal August.
In a normal August in San Luis Obispo, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093206.
What are the records for August in San Luis Obispo?
The warmest August temperature on this station's record (since 1998) is 111°F, on August 29, 2009; the coldest is 45°F, on August 15, 1999. The wettest August brought 0.04 in (2007).
The August mean against the 1991-2020 normal of 67.1°F: 2021 68.2°F (+1.1), 2022 66.6°F (−0.5), 2023 70.9°F (+3.8), 2024 71.3°F (+4.2), 2025 67.0°F (−0.1), 2026 68.8°F (+1.7). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.2°F | +1.1°F | 0.00 in |
| 2022 | 66.6°F | −0.5°F | 0.00 in |
| 2023 | 70.9°F | +3.8°F | 0.00 in |
| 2024 | 71.3°F | +4.2°F | 0.00 in |
| 2025 | 67.0°F | −0.1°F | 0.00 in |
| 2026 | 68.8°F | +1.7°F | 0.01 in |
Source: records: ACIS, station USW00093206; recent months: ACIS, station USW00093206. Records and recent months use complete months only.
How does August in San Luis Obispo 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; San Luis Obispo's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- San Luis Obispo in July78°F by day, 54°F at night
- San Luis Obispo in September80°F by day, 53°F at night
- San Luis Obispo through the yearEvery month, frost dates, records and recent years
- California in AugustThe statewide normal and the warmest and coolest places
- Needles: California's warmest Augustnormal high 109°F