San Diego weather in August: San Diego, California: normal highs, lows, rain and records for August
San Diego in August has a normal high of 77°F and a normal low of 68°F, a daily mean of 72°F, rising from 76°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 0 days in a normal August, 0.01 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 20°C, 0 mm of precipitation in August.
- NOAA stationSan Diego Lindbergh Field
- Station IDUSW00023188
- Location32.73°N 117.18°W
- Elevation15 ft (5 m)
- From the center6 miles
- Population1,404,452
- Jan 66° 50°
- Feb 66° 52°
- Mar 67° 55°
- Apr 69° 57°
- May 70° 60°
- Jun 72° 63°
- Jul 75° 66°
- Aug 77° 68°
- Sep 77° 66°
- Oct 75° 62°
- Nov 71° 55°
- Dec 66° 50°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Diego in August?
The normal high is 77°F and the normal low 68°F, for a daily mean of 72.4°F. August is 1.7°F warmer than July and 0.7°F warmer than September. August is the warmest month of the year in San Diego and the 12th wettest. Across the month the normal high rises 2°F, from 76°F on August 1 to 78°F on August 31. From one year to the next August's mean temperature typically moves about 2.1°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 2%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 76°F | 67°F | 2% | – |
| August 8 | 77°F | 68°F | 1% | – |
| August 15 | 77°F | 68°F | 1% | – |
| August 22 | 78°F | 68°F | 1% | – |
| August 31 | 78°F | 67°F | 2% | – |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 31, coldest night August 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 76°F | 67°F | 2% | – | 13 h 50 min |
| August 2 | 76°F | 67°F | 2% | – | 13 h 40 min |
| August 3 | 76°F | 67°F | 2% | – | 13 h 40 min |
| August 4 | 77°F | 67°F | 2% | – | 13 h 40 min |
| August 5 | 77°F | 67°F | 2% | – | 13 h 40 min |
| August 6 | 77°F | 67°F | 1% | – | 13 h 40 min |
| August 7 | 77°F | 67°F | 1% | – | 13 h 40 min |
| August 8 | 77°F | 68°F | 1% | – | 13 h 40 min |
| August 9 | 77°F | 68°F | 1% | – | 13 h 30 min |
| August 10 | 77°F | 68°F | 1% | – | 13 h 30 min |
| August 11 | 77°F | 68°F | 1% | – | 13 h 30 min |
| August 12 | 77°F | 68°F | 1% | – | 13 h 30 min |
| August 13 | 77°F | 68°F | 1% | – | 13 h 30 min |
| August 14 | 77°F | 68°F | 1% | – | 13 h 30 min |
| August 15 | 77°F | 68°F | 1% | – | 13 h 20 min |
| August 16 | 77°F | 68°F | 1% | – | 13 h 20 min |
| August 17 | 77°F | 68°F | 1% | – | 13 h 20 min |
| August 18 | 78°F | 68°F | 1% | – | 13 h 20 min |
| August 19 | 78°F | 68°F | 1% | – | 13 h 20 min |
| August 20 | 78°F | 68°F | 1% | – | 13 h 10 min |
| August 21 | 78°F | 68°F | 1% | – | 13 h 10 min |
| August 22 | 78°F | 68°F | 1% | – | 13 h 10 min |
| August 23 | 78°F | 68°F | 1% | – | 13 h 10 min |
| August 24 | 78°F | 68°F | 2% | – | 13 h 10 min |
| August 25 | 78°F | 68°F | 2% | – | 13 h 10 min |
| August 26 | 78°F | 68°F | 2% | – | 13 h |
| August 27 | 78°F | 68°F | 2% | – | 13 h |
| August 28 | 78°F | 68°F | 2% | – | 13 h |
| August 29 | 78°F | 68°F | 2% | – | 13 h |
| August 30 | 78°F | 68°F | 2% | – | 13 h |
| August 31 | 78°F | 67°F | 2% | – | 12 h 50 min |
- Normal high
- 77°FAugust average
- Normal low
- 68°FAugust average
- Precipitation
- 0.01 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Daylight
- 13 h 50 min to 12 h 50 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 7
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023188; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Diego 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 0 days of a normal August.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023188.
How humid and windy is San Diego in August?
At 3 p.m. the normal temperature is 76°F with 62% relative humidity and a dew point of 62°F; at 6 a.m. it is 68°F with 82% humidity. The wind averages 6.5 mph, most often from the west-northwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 68°F | 63°F | 82% | 4.1 mph | – |
| 9 a.m. | 73°F | 63°F | 71% | 6.1 mph | 48% |
| noon | 76°F | 63°F | 64% | 10.5 mph | 58% |
| 3 p.m. | 76°F | 62°F | 62% | 10.2 mph | 56% |
| 6 p.m. | 72°F | 63°F | 72% | 7.9 mph | 50% |
| 9 p.m. | 70°F | 63°F | 79% | 5.3 mph | 55% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023188. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in San Diego?
The warmest August temperature on San Diego's official record (since 1874) is 98°F, on August 31, 1955; the coldest is 54°F, on August 29, 1879. The wettest August brought 2.13 in (1977).
The August mean against the 1991-2020 normal of 72.4°F: 2021 73.6°F (+1.2), 2022 74.4°F (+2.0), 2023 71.9°F (−0.5), 2024 73.6°F (+1.2), 2025 71.3°F (−1.1), 2026 75.7°F (+3.3). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.6°F | +1.2°F | 0.23 in |
| 2022 | 74.4°F | +2.0°F | 0.00 in |
| 2023 | 71.9°F | −0.5°F | 1.84 in |
| 2024 | 73.6°F | +1.2°F | 0.00 in |
| 2025 | 71.3°F | −1.1°F | 0.05 in |
| 2026 | 75.7°F | +3.3°F | 0.00 in |
Source: records: ACIS, NWS threaded record SANthr; recent months: ACIS, station USW00023188. Records and recent months use complete months only.
How does August in San Diego 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 Diego's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.