Pomona (CA)
September
Weather in Pomona, California for September 2026
Your guide to Pomona weather in September - trends and predictions
So far, September 2026 in Pomona is slightly warmer than the historical average by 0.9 °F.
The forecast for the upcoming days in Pomona predicts a temperature of 32 °F, which is slightly above the historical average.
In general, the average temperature in Pomona at the beginning of September is 33.9 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 31.4 °F by the end of September.
With an average of 2 rainy days, Pomona experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
30°/18°
Temperatures
16 km/h
Avg max wind
53 %
Avg humidity
Pomona Weather September
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Temperatures trend during September in Pomona
See the weather trend as well as the moving average line
September weather in Pomona day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 34° /19° | 1.7 mm | 9 | |
| Sept. 2 |  Overcast | 33° /19° | 0.4 mm | 8 | |
| Sept. 3 | Sunny | 32° /19° | 1.9 mm | 8 | |
| Sept. 4 | Sunny | 33° /19° | 0 mm | 9 | |
| Sept. 5 | Sunny | 35° /20° | 0 mm | 8 | |
| Sept. 6 | Sunny | 34° /21° | 2 mm | 7 | |
| Sept. 7 | Sunny | 36° /21° | 1.9 mm | 7 | |
| Sept. 8 | Sunny | 37° /22° | 0 mm | 9 | |
| Sept. 9 | Sunny | 36° /23° | 0.1 mm | 8 | |
| Sept. 10 | Overcast | 33° /21° | 0 mm | 8 | |
| Sept. 11 |  Partly cloudy | 31° /20° | 0 mm | 8 | |
| Sept. 12 | Sunny | 30° /17° | 0 mm | 8 | |
| Sept. 13 | Sunny | 29° /17° | 0 mm | 8 | |
| Sept. 14 | Partly cloudy | 29° /17° | 0 mm | 8 | |
| Sept. 15 | Partly cloudy | 29° /17° | 0 mm | 8 | |
| Sept. 16 | Partly cloudy | 28° /17° | 0 mm | 8 | |
| Sept. 17 |  Cloudy | 27° /16° | 0.1 mm | 7 | |
| Sept. 18 | Cloudy | 27° /16° | 0 mm | 7 | |
| Sept. 19 | Sunny | 27° /15° | 0 mm | 7 | |
| Sept. 20 | Overcast | 26° /15° | 0 mm | 5 | |
| Sept. 21 | Sunny | 25° /18° | 0 mm | 7.8 | |
| Sept. 22 | Sunny | 27° /17° | 0 mm | 7.6 | |
| Sept. 23 | Sunny | 32° /20° | 0 mm | 7.6 | |
| Sept. 24 | Sunny | 31° /22° | 0 mm | 7.5 | |
| Sept. 25 | Sunny | 32° /21° | 0 mm | 7.6 | |
| Sept. 26 | Overcast | 32° /24° | 0 mm | 8 | |
| Sept. 27 | Sunny | 31° /23° | 0 mm | 8 | |
| Sept. 28 | Sunny | 30° /21° | 0 mm | 7 | |
| Sept. 29 | Sunny | 32° /24° | 0 mm | 8 | |
| Sept. 30 | Sunny | 32° /23° | 0 mm | 8 | |
| Next | |||||
Important Notice
Our weather forecast for Pomona 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 Pomona forecast closer to your planned date for the most up-to-date weather information.
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Pomona in September - FAQ
What are the expected maximum and minimum temperatures in Pomona during September?
Expect warm days with temperatures around 30°, cooling to mild conditions of 18° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Pomona during September?
Rainfall in Pomona during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 2 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 Pomona during September?
The average wind speed in Pomona during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Pomona
Explore the daily rainfall trends and prepare for Pomonas September weather 💧
Typically, Pomona has 2 rainy days in September with a total of 6.1 mm of rainfall.
UV exposure in Pomona during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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