San Diego in September
5.9out of 10
Possible, with caveats
Warm and comfortable: highs around 30°C. Very wet: about 29 rainy days.
30°CAvg high
22°CAvg low
29Rainy days (469 mm)
12:03 hDaylight
05:45Sunrise · 17:49 Sunset
Why this score
- Warm and comfortable: highs around 30°C
- Very wet: about 29 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
- Sunscreen, sunglasses and a hat
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (0.8 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 30°C | 20°C | 53 mm | 7 | – | – | 8.0 |
| February | 30°C | 21°C | 73 mm | 8 | – | – | 7.8 |
| March | 30°C | 21°C | 188 mm | 15 | – | – | 6.4 |
| April | 29°C | 22°C | 407 mm | 24 | – | – | 6.0 |
| May | 29°C | 22°C | 568 mm | 31 | – | – | 6.0 |
| June | 30°C | 22°C | 390 mm | 28 | – | – | 5.9 |
| July | 30°C | 22°C | 260 mm | 27 | – | – | 5.7 |
| August | 30°C | 22°C | 379 mm | 29 | – | – | 5.7 |
| September | 30°C | 22°C | 469 mm | 29 | – | – | 5.9 |
| October | 29°C | 22°C | 510 mm | 30 | – | – | 6.1 |
| November | 28°C | 21°C | 356 mm | 26 | – | – | 6.1 |
| December | 29°C | 21°C | 131 mm | 16 | – | – | 6.7 |
Frequently asked questions
How hot is San Diego in September?
Daytime highs average 30°C and nights about 22°C.
When is the best time to visit San Diego?
The best months are January, February.