San Diego, California Weather in September
United States · September climate averages and travel tips
Avg high30°C (87°F)
Avg low19°C (66°F)
Rainfall6 mm (0.2 in)
RatingExcellent 8.6/10
In September, San Diego has average highs of 30°C (87°F) and lows of 19°C (66°F). September is autumn (fall) in United States. The month is very dry, with about 6 mm (0.2 in) of rain spread over 1 day, one of the driest months of the year. You get roughly 12.2 hours of daylight and a mix of sun and cloud.
Is September a good time to visit San Diego?
September is a good time to visit San Diego (8.6/10), though October to June are even better.
September weather at a glance
| Average high | 30°C (87°F) |
|---|---|
| Average low | 19°C (66°F) |
| Daily mean | 24°C (74°F) |
| Rainfall | 6 mm (0.2 in) |
| Rainy days (1 mm+) | 1 |
| Humidity | 58% |
| Cloud cover | 56% |
| Daylight | 12.2 hours |
| Est. sunshine | 5.9 hours/day |
| Wind | 7.1 km/h |
| vs August | 1°C cooler than August, with similar rainfall. |
What to pack for San Diego in September
- light, breathable clothing
- sunscreen and a hat
- swimwear
San Diego weather in other months
Jan19°C / 10°C51 mmExcellentFeb19°C / 10°C52 mmExcellentMar20°C / 11°C39 mmExcellentApr22°C / 12°C15 mmExcellentMay24°C / 13°C8 mmExcellentJun27°C / 15°C14 mmExcellentJul31°C / 18°C4 mmGoodAug32°C / 19°C6 mmGoodSep30°C / 19°C6 mmExcellentOct27°C / 16°C9 mmExcellentNov23°C / 13°C25 mmExcellentDec19°C / 10°C51 mmExcellent
← AugustBest time to visit San DiegoOctober →
Better weather in September nearby
- San Francisco, California24°C · 4 mm · Excellent
- Seattle, Washington21°C · 62 mm · Excellent
- Denver, Colorado29°C · 35 mm · Excellent
- Calgary20°C · 49 mm · Excellent
Nearby in September
- Tijuana30°C · 6 mm
- Mexicali40°C · 8 mm
- Los Angeles, California31°C · 4 mm
- Las Vegas, Nevada36°C · 10 mm
- Phoenix, Arizona38°C · 22 mm
- San Francisco, California24°C · 4 mm
Where else is good in September? See where to go in September.