San Diego: weather and best time to visit
San Diego (United States) reaches its warmest daytime temperatures in August at around 25°C; the coolest month is December at around 17°C. The sea is warmest in August at about 21°C.
Best time to visit
- 🏖 Beach
- 🏛 City trip
- 🥾 Hiking
Things to do in San Diego
Tours, tickets and activities for your trip.
San Diego climate, month by month
| Month | Day °C | Night °C | Sea °C | Rain d | Sun h | Beach | City | Hiking |
|---|---|---|---|---|---|---|---|---|
| Jan | 18° | 9° | 15° | 6 | 8 | 51 | 77 | 86 |
| Feb | 18° | 9° | 15° | 5 | 9 | 53 | 78 | 88 |
| Mar | 18° | 10° | 16° | 7 | 10 | 51 | 75 | 84 |
| Apr | 19° | 12° | 16° | 5 | 11 | 57 | 86 | 89 |
| May | 20° | 14° | 17° | 2 | 11 | 63 | 96 | 96 |
| Jun | 22° | 15° | 19° | 1 | 11 | 68 | 97 | 97 |
| Jul | 24° | 17° | 20° | 0 | 12 | 78 | 99 | 93 |
| Aug | 25° | 18° | 21° | 0 | 12 | 83 | 99 | 88 |
| Sep | 25° | 18° | 21° | 1 | 11 | 81 | 98 | 87 |
| Oct | 23° | 15° | 19° | 3 | 10 | 70 | 93 | 90 |
| Nov | 20° | 12° | 18° | 3 | 9 | 62 | 93 | 93 |
| Dec | 17° | 9° | 16° | 5 | 9 | 52 | 78 | 89 |
Rain d = average rain days per month · Sun h = average sunshine hours per day · scores 0–100, higher is better.
Every month in detail
San Diego in January
Daytime highs around 18°C, nights near 9°C. Expect about 6 rain days and 8 hours of sunshine per day. The sea is cold at 15°C — not swimming weather.
Beach: mixedCity: goodHiking: excellentMore destinations for January →
San Diego in February
Daytime highs around 18°C, nights near 9°C. Expect about 5 rain days and 9 hours of sunshine per day. The sea is cold at 15°C — not swimming weather.
Beach: mixedCity: goodHiking: excellentMore destinations for February →
San Diego in March
Daytime highs around 18°C, nights near 10°C. It is the rainiest month of the year. Expect about 7 rain days and 10 hours of sunshine per day. The sea is cold at 16°C — not swimming weather.
Beach: mixedCity: goodHiking: excellentMore destinations for March →
San Diego in April
Daytime highs around 19°C, nights near 12°C. Expect about 5 rain days and 11 hours of sunshine per day. The sea is cold at 16°C — not swimming weather.
Beach: mixedCity: excellentHiking: excellentMore destinations for April →
San Diego in May
Daytime highs around 20°C, nights near 14°C. Expect about 2 rain days and 11 hours of sunshine per day. The sea is cold at 17°C — not swimming weather.
Beach: goodCity: excellentHiking: excellentMore destinations for May →
San Diego in June
Daytime highs around 22°C, nights near 15°C. Expect about 1 rain day and 11 hours of sunshine per day. The sea is on the fresh side at 19°C.
Beach: goodCity: excellentHiking: excellentMore destinations for June →
San Diego in July
Daytime highs around 24°C, nights near 17°C. No month gets more sunshine. Expect about 0 rain days and 12 hours of sunshine per day. The sea is on the fresh side at 20°C.
Beach: goodCity: excellentHiking: excellentMore destinations for July →
San Diego in August
Daytime highs around 25°C, nights near 18°C. August is the warmest month of the year. It is also the driest month of the year. The sea is at its warmest now. Expect about 0 rain days and 12 hours of sunshine per day. The sea is pleasant for swimming at 21°C.
Beach: excellentCity: excellentHiking: excellentMore destinations for August →
San Diego in September
Daytime highs around 25°C, nights near 18°C. Expect about 1 rain day and 11 hours of sunshine per day. The sea is on the fresh side at 21°C.
Beach: excellentCity: excellentHiking: excellentMore destinations for September →
San Diego in October
Daytime highs around 23°C, nights near 15°C. Expect about 3 rain days and 10 hours of sunshine per day. The sea is on the fresh side at 19°C.
Beach: goodCity: excellentHiking: excellentMore destinations for October →
San Diego in November
Daytime highs around 20°C, nights near 12°C. Expect about 3 rain days and 9 hours of sunshine per day. The sea is cold at 18°C — not swimming weather.
Beach: goodCity: excellentHiking: excellentMore destinations for November →
San Diego in December
Daytime highs around 17°C, nights near 9°C. December is the coldest month of the year. Expect about 5 rain days and 9 hours of sunshine per day. The sea is cold at 16°C — not swimming weather.
Beach: mixedCity: goodHiking: excellentMore destinations for December →
Related destinations
More in United States: Miami Beach · Key West · Orlando · New York City · Santa Monica · San Francisco
Similar climate: Essaouira, Morocco · Agadir, Morocco · Fuerteventura, Spain · Marbella, Spain