Oceanside (CA)
September
Weather in Oceanside, California for September 2026
Your guide to Oceanside weather in September - trends and predictions
So far, September 2026 in Oceanside shows a warmer trend than usual by 3.2 °F.
The forecast for the upcoming days in Oceanside predicts a temperature of 23.5 °F, which is slightly above the historical average.
In general, the average temperature in Oceanside at the beginning of September is 26.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23 °F by the end of September.
Precipitation in Oceanside during September is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
More
29
Dry days
1
Rainy days
0
Snow days
23°/17°
Temperatures
17 km/h
Avg max wind
79 %
Avg humidity
Oceanside Weather September
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Temperatures trend during September in Oceanside
See the weather trend as well as the moving average line
September weather in Oceanside day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 26° /18° | 0 mm | 8 | |
| Sept. 2 |  Sunny | 26° /18° | 0 mm | 7 | |
| Sept. 3 | Sunny | 26° /17° | 0.1 mm | 7 | |
| Sept. 4 | Sunny | 25° /17° | 0 mm | 7 | |
| Sept. 5 | Sunny | 27° /17° | 0 mm | 8 | |
| Sept. 6 |  Overcast | 28° /19° | 0.1 mm | 5 | |
| Sept. 7 | Partly cloudy | 29° /19° | 0 mm | 6 | |
| Sept. 8 | Partly cloudy | 30° /21° | 0.8 mm | 7 | |
| Sept. 9 | Partly cloudy | 28° /20° | 0 mm | 7 | |
| Sept. 10 | Overcast | 27° /19° | 0 mm | 7 | |
| Sept. 11 |  Cloudy | 25° /18° | 0 mm | 7 | |
| Sept. 12 |  Mist | 24° /17° | 0 mm | 6 | |
| Sept. 13 | Cloudy | 23° /16° | 0 mm | 6 | |
| Sept. 14 | Partly cloudy | 23° /17° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 23° /16° | 0 mm | 7 | |
| Sept. 16 | Partly cloudy | 23° /17° | 0.1 mm | 7 | |
| Sept. 17 | Overcast | 22° /17° | 0.7 mm | 6 | |
| Sept. 18 | Mist | 23° /17° | 0 mm | 6 | |
| Sept. 19 | Mist | 22° /16° | 0 mm | 6 | |
| Sept. 20 | Mist | 22° /16° | 0 mm | 4 | |
| Sept. 21 |  Patchy rain possible | 21° /20° | 0.3 mm | 7.8 | |
| Sept. 22 | Sunny | 21° /19° | 0 mm | 7.9 | |
| Sept. 23 | Sunny | 22° /20° | 0 mm | 7.7 | |
| Sept. 24 | Sunny | 22° /21° | 0 mm | 7.5 | |
| Sept. 25 | Sunny | 23° /22° | 0 mm | 7.7 | |
| Sept. 26 | Overcast | 24° /22° | 0 mm | 6 | |
| Sept. 27 | Sunny | 23° /21° | 0 mm | 6 | |
| Sept. 28 | Sunny | 22° /20° | 0 mm | 6 | |
| Sept. 29 | Sunny | 23° /21° | 0 mm | 6 | |
| Sept. 30 | Sunny | 24° /22° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Oceanside in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Oceanside forecast closer to your planned date for the most up-to-date weather information.
Change Month
Oceanside in September - FAQ
What are the expected maximum and minimum temperatures in Oceanside during September?
During September, expect a variety of temperatures with highs around 23° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Oceanside during September?
Rainfall in Oceanside during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Oceanside during September?
The average wind speed in Oceanside during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
UV exposure in Oceanside during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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