Fontana
September
Weather in Fontana for September 2025
Your guide to Fontana weather in September - trends and predictions
In general, the average temperature in Fontana at the beginning of September is 33.4 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 30.9 °F by the end of September.
With an average of 3 rainy days, Fontana experiences minimal rainfall in September.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
30°/18°
Temperatures
15 km/h
Avg max wind
46 %
Avg humidity
Fontana in September average weather
Move between months or click on a day
| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  33° | 2  33° | 3 30° | 4  32° | 5 34° | 6 36° | |
| 7  36° | 8 36° | 9 37° | 10  34° | 11 31° | 12 29° | 13 29° |
| 14 29° | 15 27° | 16 26° | 17 24° | 18 23° | 19 22° | 20 22° |
| 21 22° | 22  28° | 23 33° | 24 32° | 25 31° | 26 32° | 27 32° |
| 28 31° | 29 31° | 30 27° |
You can click on date
Access Fontana weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Fontana
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Patchy rain possible | 33° /21° | 0.7 mm | 8 | |
| Sept. 2 | Light rain | 33° /20° | 1.9 mm | 8 | |
| Sept. 3 | Light rain | 30° /19° | 3.1 mm | 8 | |
| Sept. 4 | Partly cloudy | 32° /19° | 0 mm | 8 | |
| Sept. 5 | Partly cloudy | 34° /21° | 0 mm | 8 | |
| Sept. 6 | Partly cloudy | 36° /22° | 0 mm | 9 | |
| Sept. 7 | Sunny | 36° /23° | 0 mm | 8 | |
| Sept. 8 | Partly cloudy | 36° /26° | 0 mm | 8 | |
| Sept. 9 | Sunny | 37° /26° | 0 mm | 9 | |
| Sept. 10 | Cloudy | 34° /25° | 0 mm | 8 | |
| Sept. 11 | Partly cloudy | 31° /22° | 0 mm | 8 | |
| Sept. 12 | Sunny | 29° /17° | 0 mm | 8 | |
| Sept. 13 | Sunny | 29° /17° | 0 mm | 8 | |
| Sept. 14 | Sunny | 29° /17° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 27° /16° | 0 mm | 7 | |
| Sept. 16 | Sunny | 26° /15° | 0.1 mm | 6 | |
| Sept. 17 | Partly cloudy | 24° /12° | 0 mm | 6 | |
| Sept. 18 | Cloudy | 23° /12° | 0 mm | 6 | |
| Sept. 19 | Partly cloudy | 22° /13° | 0 mm | 6 | |
| Sept. 20 | Partly cloudy | 22° /12° | 0 mm | 5 | |
| Sept. 21 | Patchy rain possible | 22° /12° | 0 mm | 6 | |
| Sept. 22 | Overcast | 28° /14° | 0 mm | 7 | |
| Sept. 23 | Partly cloudy | 33° /19° | 0 mm | 8 | |
| Sept. 24 | Sunny | 32° /18° | 0 mm | 8 | |
| Sept. 25 | Sunny | 31° /18° | 0 mm | 8 | |
| Sept. 26 | Overcast | 32° /18° | 0 mm | 8 | |
| Sept. 27 | Partly cloudy | 32° /19° | 0 mm | 8 | |
| Sept. 28 | Sunny | 31° /18° | 0 mm | 8 | |
| Sept. 29 | Sunny | 31° /18° | 0 mm | 8 | |
| Sept. 30 | Light rain shower | 27° /16° | 1.9 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Fontana 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 Fontana forecast closer to your planned date for the most up-to-date weather information.
Fontana in September - FAQ
What are the expected maximum and minimum temperatures in Fontana 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 Fontana during September?
Rainfall in Fontana during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 3 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 Fontana during September?
The average wind speed in Fontana during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Fontana
Explore the daily rainfall trends and prepare for Fontanas September weather 💧
UV exposure in Fontana during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
You are here
Where is Fontana?Get accurate weather forecasts for Fontana, located at latitude 34.092 and longitude -117.435. Stay updated with localized weather information tailored for Fontana.
Found a mistake?
We appreciate your attention to details. Tell us here.