Santa Barbara weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May – October
What is the weather like in Santa Barbara in September?
In September, Santa Barbara is hot: daytime highs average 27 °C, and nights cool down to about 17 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. With around 10 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 7 days the thermometer climbs to 30 °C or more. All in all, September is an excellent month for a holiday in Santa Barbara.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 80 | 81 | 77 |
| Day | 28° | 27° | 25° |
| Night | 19° | 17° | 14° |
| Sea | 18° | 19° | 18° |
| Sun | 12 h | 10 h | 9 h |
| Rain days | 0 | 1 | 2 |
More details for September
- Daylight
- 12 h 26 min06:41 – 19:07
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 15 %on averageAll months
- Hot days
- 7 days30 °C or moreAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %23 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
Santa Barbara in September: quick answers
Is Santa Barbara hot in September?
Yes. In September, Santa Barbara is hot: daytime highs average 27 °C and nights stay around 17 °C. On about 7 days the thermometer climbs to 30 °C or more.
Can you swim in Santa Barbara in September?
Only if you don't mind cold water: in September the sea averages just 18.6 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Santa Barbara in September?
It hardly ever rains.
Santa Barbara month by month
The whole year in Santa BarbaraAll destinations: USAWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences