San Diego, CA weather in August
Expect mild, dry weather in San Diego in August, with highs near 77°F and lows near 68°F. Rain is rare. Good for outdoor plans.
- Normal high
- 77°F
- Normal low
- 68°F
- Wet days
- 0
- 0.01 in total
- Muggy days
- 7
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 76°F | 78°F |
| Normal low | 67°F | 67°F |
| Chance of a wet day | 2% | 2% |
| Sunrise / sunset | 6:02 am / 7:47 pm | 6:22 am / 7:15 pm |
| Daylight | 13.7 h | 12.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical August day
- 6 am68°Fdew point 62°F
- 9 am72°Fdew point 63°F
- Noon75°Fdew point 63°F
- 3 pm75°Fdew point 62°F
- 6 pm72°Fdew point 62°F
- 9 pm70°Fdew point 63°F
NOAA hourly normals (local standard time) from San Diego Lindbergh Fld (2 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F6 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph7 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more7 of 31
- Wet daysat least 0.01 in of rain or melted snow0 of 31
- Notable rainat least 0.10 in0 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 0.01 in; a dry August brings about 0.0 in and a wet one about 0.01 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20202018: average high 83°F
- Coolest August1999: average high 73°F
- Wettest August2014: 0.08 in
- Driest August1993: no measurable precipitation
- Highest reading94°F (August 12, 1991)
- Lowest reading60°F (August 12, 2015)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 75°F | 77°F | 77°F |
| Normal low | 66°F | 68°F | 66°F |
| Wet days | 1 | 0 | 1 |
| Comfortable days | 11 | 6 | 9 |
| Daylight | 14.1 h | 13.3 h | 12.4 h |
Highs change by +2°F from July and 0°F into September.
Nearby alternatives in August
- Warmer: El Cajon, CA13 mi · high 89°F · 0 wet days
- Cooler: Oceanside, CA36 mi · high 71°F · 0 wet days
How San Diego ranks in August
- Normal high342nd warmest of 378 cities; 49th of 60 in California
- Wet days35th driest of 378
- Comfortable days121st most of 341
Heating and cooling
August has 0 heating degree days and 230 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is San Diego in August?
The normal high is 77°F and the normal low is 68°F. From 1991 to 2020 the hottest August reading was 94°F (August 12, 1991).
Does it rain a lot in San Diego in August?
About 0 days in August have at least 0.01 in of precipitation, and the normal total is 0.01 in. The wettest August in 1991-2020 was in 2014 (0.08 in); the driest was in 1993, with no measurable precipitation.
Is August a good time to visit San Diego?
August ranks 12th of 12 months on our comfort score for San Diego (63 out of 100). It has about 6 comfortable days. The best months are May and June.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: San Diego Lindbergh Fld (USW00023188), 2.0 mi NW of the city center, 15 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Chula Vista (USC00041758), 6.7 mi SE of the city center, 56 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Diego International Airport (722900-23188), 2.0 mi NW of the city center, 15 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).