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San Diego in August: weather, sea & travel advice
This month's data profile
Strong month under the current formula
San Diego in August is climatically well suited to beach holidays, family holidays, city breaks and active holidays and hiking. The average daily high is around 30 °C, and the sea is about 21 °C. With about 1 rainy day it is very dry.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
79/100 · #6
Warmth
#1
Dryness
#3
Sun
#4
Sea warmth
#1
Published best categories: Beach
San Diego · AugustPhoto: Rufustelestrat · CC BY 2.5Climate facts
- Average high
- 30 °C
- Average low
- 18 °C
- Sea
- 21 °C
- Rainy days (est.)
- 1 rainy day (est.)
- Sun (est.)
- 9 h/day
- Humidity
- 56 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| July | 29 | 17 | 1 | 4 | 9.6 | 58 | 2.1 | 20 | 81 |
| August (selected) | 30 | 18 | 1 | 6 | 9.0 | 56 | 2.0 | 21 | 79 |
| September | 29 | 17 | 1 | 9 | 7.8 | 58 | 1.9 | 21 | 83 |
How do the previous and next months compare?
Baseline: August (79/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| July | +2 | -1.2 °C | -1.3 °C | -0.4 | -1.8 mm | +0.6 h | +2.3 % | +0.1 m/s | -0.8 °C |
| September | +4 | -1.5 °C | -0.6 °C | +0.1 | +2.9 mm | -1.2 h | +2.4 % | ±0 m/s | -0.4 °C |
All twelve months in context
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Frequently asked questions
How warm is San Diego in August?
The average daily high is around 30 °C, with an average daily low of about 18 °C.
Can you swim in San Diego in August?
The sea is about 21 °C (refreshing).
Does it rain a lot in San Diego in August?
The curated estimate is about 1 rainy day per month, not a directly measured long-term average. Total precipitation averages around 6 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Diego?
By the climate score, May, June, September and October are the strongest months for San Diego. For a beach trip: June, July, August and September. August is not among them.