Oakland 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: April – October
What is the weather like in Oakland in September?
In September, Oakland is warm: daytime highs average 23 °C, and nights cool down to about 13 °C. The sea averages 14.6 °C – swimming is only for the hardy. With around 9 hours of sunshine a day, there is plenty of sun. It hardly ever rains. All in all, September is an excellent month for a holiday in Oakland.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 100 | 100 | 95 |
| Day | 22° | 23° | 21° |
| Night | 13° | 13° | 12° |
| Sea | 15° | 15° | 14° |
| Sun | 10 h | 9 h | 8 h |
| Rain days | 0 | 1 | 3 |
More details for September
- Daylight
- 12 h 29 min06:50 – 19:19
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 34 %on averageAll months
- Hot days
- 2 days30 °C or moreAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Oakland in September: quick answers
Is Oakland hot in September?
Warm rather than hot: in September, daytime highs in Oakland average 23 °C and nights cool to about 13 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in Oakland in September?
Only if you don't mind cold water: in September the sea averages just 14.6 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Oakland in September?
It hardly ever rains.
Oakland month by month
The whole year in OaklandAll 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