San DiegoPhoto: Rufustelestrat · CC BY 2.5USA · North America
Best time to visit San Diego
San Diego combines mild, sunny days with beaches, Balboa Park and the zoo. The sea is warmest in late summer but stays comparatively cool.
Climate decision
Best travel months for San Diego
Top recommendation
Next highest scores
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Latest 5-year values 2021–2025
Average of the five most recent complete years compared with the 1991–2025 climate average.
March · Wet days
9.2 days/month
1991–2025: 6.5 days/month
+2.7 days/month · higher
March · Monthly precipitation
71.5 mm/month
1991–2025: 44.8 mm/month
+26.7 mm/month · higher
December · Mean daily maximum
19.1 °C
1991–2025: 17.8 °C
+1.3 °C · higher
August · Sea temperature
21 °C
1991–2025: 21 °C
+0 °C · similar
September: 55/150 days at or above 30 °C; highest single value 38.7 °C.
Five-year historical sample, not a weather forecast or long-term climate trend. Individual hot days can be far above the monthly mean.
Annual profile · Balanced signals
San Diego: no single climate figure decides
Choose a suitable temperature range first, then compare rain, sunshine and the intended trip style within that window.
Average daily highs vary by 12.7 °C and rainy days by 6.6. Temperature, dryness and sunshine should therefore be considered together.
The useful trade-off
Highest average daily high
August · 30.5 °C
Fewest rainy days
June · 0.6
Most sunshine
June · 10.3 h
Warmest sea
August · 21 °C
Month by month
Overall suitability per month. Tap a month for details.
All climate figures compared
The table is the complete accessible data view; the charts below highlight selected patterns.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Rain mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| January | 18 | 9 | 6 | 54 | 4.3 | 65 | 2.5 | 15 | 62 |
| February | 18 | 9 | 7 | 58 | 5.4 | 68 | 2.5 | 15 | 63 |
| March | 19 | 9 | 6 | 45 | 7.0 | 69 | 2.4 | 15 | 69 |
| April | 21 | 10 | 3 | 15 | 8.7 | 68 | 2.5 | 16 | 77 |
| May | 23 | 12 | 1 | 6 | 9.6 | 69 | 2.5 | 17 | 82 |
| June | 26 | 14 | 1 | 9 | 10.3 | 64 | 2.2 | 19 | 85 |
| July | 29 | 17 | 1 | 4 | 9.6 | 58 | 2.1 | 20 | 81 |
| August | 30 | 18 | 1 | 6 | 9.0 | 56 | 2.0 | 21 | 79 |
| September | 29 | 17 | 1 | 9 | 7.8 | 58 | 1.9 | 21 | 83 |
| October | 25 | 15 | 2 | 12 | 6.3 | 60 | 2.0 | 19 | 87 |
| November | 21 | 11 | 4 | 21 | 4.8 | 59 | 2.3 | 17 | 78 |
| December | 18 | 9 | 5 | 42 | 3.9 | 64 | 2.5 | 16 | 64 |
Climate through the year
Compare temperature, rainy days, sunshine and, for coastal destinations, sea temperature month by month.
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Where to stay in San Diego
Compare available stays, prices and cancellation terms for San Diego on Booking.com.
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Similar destinations
The number is the overall climate score, not a similarity score.
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Frequently asked questions
When is the best time to visit San Diego?
The strongest climate months are May, June, September, October. Values are historical averages, not a forecast.
Which month has the highest average daily maximum temperature in San Diego?
The average daily maximum temperature in San Diego is highest in August at around 30 °C.
When is the sea warmest at San Diego?
In August, at around 21 °C.