Weather in San Diego, California, United States in September
In an average September, San Diego sees a daily high around 83°F and a low around 63°F, based on 1981–2026 of local climate records.
| Average high | 83°F |
|---|---|
| Typical high range | 73°F to 92°F |
| Average low | 63°F |
| Typical low range | 56°F to 70°F |
| Average daily precipitation | 0.00 in |
September records
The most extreme September on record for each metric, across 1981–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
102°F
2020-09-05
Lowest
66°F
1986-09-23
Low
Highest
80°F
2024-09-08
Lowest
51°F
1986-09-23
Feels-like
Highest
121°F
2022-09-05
Lowest
51°F
1986-09-23
Humidity
Highest
17.8 g/m³
1983-09-20
Lowest
5.3 g/m³
1999-09-29
Wind
Highest
27 mph
2022-09-09
Lowest
4 mph
1983-09-19
Precip
Wettest
3.65 in
2025
Driest
0.00 in
2020
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