Temperature
Pleasant by day, mild at night.
77°Ftypical September high
Typical range
September climate
September in San Diego
United States · North America
Warm days.
One of the best months here
Daytime high
77°F
Lows around 66°F
Rain
Very little rain
Sun
Not available
Air feel
Slightly humid
Sea temp
67°F
Cool water for swimming
When to visit
Month-by-month fit
Best
Precipitation
Mostly dry. About 1 wet day, fewer than in most months.
2%wet-day frequency
AmountWet-day chance
Sunshine
Sunshine estimates are less reliable here; cloud and rain patterns are a better guide.
Heat & humidity by month
Warm days, with humid periods.
Slightly humidSeptember Heat feel
Easy airWarm airHot airHumid air
Air-feel chart data is currently unavailable
Clear sky
Partly cloudy skies this month.
44%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
6 mphSeptember Calm
Sea temperature
67°FSeptember sea temp
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 66 | 49 | 1.6 | 4 | — | 64 | 59 |
| Feb | 66 | 51 | 1.9 | 5 | — | 65 | 59 |
| Mar | 67 | 54 | 1.2 | 5 | — | 67 | 59 |
| Apr | 68 | 57 | 0.6 | 2 | — | 66 | 60 |
| May | 69 | 60 | 0.3 | 1 | — | 70 | 61 |
| Jun | 71 | 63 | 0.0 | 0 | — | 74 | 63 |
| Jul | 75 | 66 | 0.1 | 0 | — | 75 | 66 |
| Aug | 77 | 68 | 0.1 | 0 | — | 74 | 67 |
| Sep | 77 | 66 | 0.2 | 1 | — | 73 | 67 |
| Oct | 74 | 61 | 0.6 | 2 | — | 69 | 66 |
| Nov | 71 | 54 | 0.9 | 3 | — | 64 | 64 |
| Dec | 66 | 50 | 1.8 | 4 | — | 66 | 61 |
Similar climates
Similar
Similar travel styleLos AngelesUnited StatesSimilar travel styleBarcelonaSpainSimilar travel styleSyracuseItalySimilar travel stylePalermoItaly
Want a side-by-side climate view? Compare San Diego with Los Angeles.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology