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United States weather

Weather in Fontana, California for September 2025

Your guide to Fontana weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Beach Hazards Statement - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Fontana is slightly cooler than the historical average by -1.5 °F.

  • Expect cooler weather in the next days in Fontana with the forecast suggesting a temperature of 30.1 °F, lower than the historical average.

  • In general, the average temperature in Fontana at the beginning of September is 34.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.9 °F by the end of September.

    • Rain 🌧️

  • With an average of 3 rainy days, Fontana experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
27
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
30°/18°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
46 %
Avg humidity

Fontana Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
35°
2
Light rain
34°
3
Light rain
31°
4
Sunny
33°
5
Sunny
35°
6
Sunny
36°
7
Sunny
35°
8
Partly cloudy
35°
9
Sunny
34°
10
Cloudy
30°
11
Partly cloudy
29°
12
Sunny
27°
13
Sunny
29°
14
Sunny
30°
15
Weather Alert Sunny
36°
16
Sunny
37°
17
Partly cloudy
34°
18
Moderate rain
29°
19
Patchy rain possible
28°
20
Sunny
30°
21
Sunny
32°
22
Patchy rain possible
29°
23
Sunny
29°
24
Partly cloudy
32°
25
Partly cloudy
32°
26
Sunny
30°
27
Patchy rain possible
22°
28
Patchy rain possible
21°
29
Sunny
31°
30
Light rain shower
27°

Temperatures trend during September in Fontana

See the weather trend as well as the moving average line

September weather in Fontana day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Patchy rain possible
Patchy rain possible
 35° /22° 0.5 mm 8
Sept. 2 Light rain
Light rain
 34° /22° 2.5 mm 8
Sept. 3 Light rain
Light rain
 31° /20° 2.1 mm 7
Sept. 4 Sunny
Sunny
 33° /21° 0 mm 8
Sept. 5 Sunny
Sunny
 35° /22° 0 mm 8
Sept. 6 Sunny
Sunny
 36° /22° 0 mm 9
Sept. 7 Sunny
Sunny
 35° /23° 0 mm 8
Sept. 8 Partly cloudy
Partly cloudy
 35° /24° 0 mm 8
Sept. 9 Sunny
Sunny
 34° /22° 0 mm 8
Sept. 10 Cloudy
Cloudy
 30° /21° 0 mm 7
Sept. 11 Partly cloudy
Partly cloudy
 29° /19° 0 mm 7
Sept. 12 Sunny
Sunny
 27° /16° 0 mm 7
Sept. 13 Sunny
Sunny
 29° /16° 0 mm 7
Sept. 14 Sunny
Sunny
 30° /17° 0 mm 7
Sept. 15 Sunny
Sunny
 36° /20° 0 mm 2
Sept. 16 Sunny
Sunny
 37° /23° 0 mm 2
Sept. 17 Partly cloudy
Partly cloudy
 34° /21° 0 mm 1.8
Sept. 18 Moderate rain
Moderate rain
 29° /19° 9.8 mm 1.8
Sept. 19 Patchy rain possible
Patchy rain possible
 28° /20° 3.6 mm 0
Sept. 20 Sunny
Sunny
 30° /20° 0 mm 6
Sept. 21 Sunny
Sunny
 32° /20° 0 mm 7
Sept. 22 Patchy rain possible
Patchy rain possible
 29° /20° 0.6 mm 5
Sept. 23 Sunny
Sunny
 29° /19° 0 mm 6
Sept. 24 Partly cloudy
Partly cloudy
 32° /20° 0 mm 7
Sept. 25 Partly cloudy
Partly cloudy
 32° /22° 0 mm 7
Sept. 26 Sunny
Sunny
 30° /17° 0 mm 6
Sept. 27 Patchy rain possible
Patchy rain possible
 22° /13° 0.2 mm 4
Sept. 28 Patchy rain possible
Patchy rain possible
 21° /11° 0.7 mm 4
Sept. 29 Sunny
Sunny
 31° /18° 0 mm 8
Sept. 30 Light rain shower
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.
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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 ☀️

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Location coordinates 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.

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