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Weather in Ontario, California for October 2025

Your guide to Ontario weather in October - trends and predictions

    Temperatures

  • Until now, October 2025 in Ontario is cooler than usual, with temperatures averaging 24.6 °F, this is -3.4 °F below the typical seasonal average.

  • The forecast for the next days in Ontario predicts a temperature of 27.5 °F, which is cooler than the historical average.

  • In general, the average temperature in Ontario at the beginning of October is 31 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26 °F by the end of October.

    • Rain 🌧️

  • Precipitation in Ontario during October is a rare event, with an average of fewer than 2 rainy days.

    • More

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

Average dry days
31
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/16°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
38 %
Avg humidity

Ontario Weather October

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

Temperatures trend during October in Ontario

See the weather trend as well as the moving average line

October weather in Ontario day by day

Click on a date for more information
September November
Date Weather Temperatures Rain UV More
Oct. 1 Patchy rain possible
Patchy rain possible
 27° /14° 0.1 mm 6
Oct. 2 Partly cloudy
Partly cloudy
 29° /15° 0 mm 7
Oct. 3 Sunny
Sunny
 29° /16° 0 mm 7
Oct. 4 Sunny
Sunny
 32° /16° 0 mm 8
Oct. 5 Sunny
Sunny
 33° /18° 0 mm 8
Oct. 6 Sunny
Sunny
 33° /18° 0 mm 8
Oct. 7 Sunny
Sunny
 34° /19° 0 mm 8
Oct. 8 Sunny
Sunny
 33° /19° 0 mm 8
Oct. 9 Overcast
Overcast
 31° /19° 9.5 mm 7
Oct. 10 Sunny
Sunny
 30° /18° 0 mm 8
Oct. 11 Sunny
Sunny
 26° /14° 0 mm 7
Oct. 12 Sunny
Sunny
 28° /15° 0 mm 7
Oct. 13 Overcast
Overcast
 23° /13° 0 mm 6
Oct. 14 Overcast
Overcast
 22° /12° 20.4 mm 5
Oct. 15 Sunny
Sunny
 25° /12° 0 mm 6
Oct. 16 Sunny
Sunny
 27° /13° 0 mm 7
Oct. 17 Overcast
Overcast
 26° /14° 0 mm 6
Oct. 18 Sunny
Sunny
 30° /14° 0 mm 7
Oct. 19 Sunny
Sunny
 30° /16° 0 mm 8
Oct. 20 Sunny
Sunny
 32° /16° 0 mm 8
Oct. 21 Partly cloudy
Partly cloudy
 29° /15° 0 mm 7
Oct. 22 Partly cloudy
Partly cloudy
 24° /13° 0 mm 6
Oct. 23 Patchy rain possible
Patchy rain possible
 26° /13° 0.1 mm 6
Oct. 24 Partly cloudy
Partly cloudy
 26° /14° 0 mm 6
Oct. 25 Partly cloudy
Partly cloudy
 24° /14° 0 mm 6
Oct. 26 Patchy rain possible
Patchy rain possible
 24° /14° 0 mm 6
Oct. 27 Partly cloudy
Partly cloudy
 26° /14° 0 mm 6
Oct. 28 Sunny
Sunny
 23° /14° 0 mm 6
Oct. 29 Sunny
Sunny
 24° /12° 0 mm 6
Oct. 30 Sunny
Sunny
 31° /18° 0 mm 1.1
Oct. 31 Sunny
Sunny
 30° /18° 0 mm 1
Next
Important Notice
Our weather forecast for Ontario in October 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 Ontario forecast closer to your planned date for the most up-to-date weather information.
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Ontario in October - FAQ

What are the expected maximum and minimum temperatures in Ontario during October?
During October, expect a variety of temperatures with highs around 28° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Ontario during October?
Rainfall in Ontario during October is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 0 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 Ontario during October?
The average wind speed in Ontario during October is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

October rainfall patterns in Ontario

Explore the daily rainfall trends and prepare for Ontarios October weather 💧

UV exposure in Ontario during October

Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️

Quick links

More Ontario weather pages
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Location coordinates Where is Ontario?

Get accurate weather forecasts for Ontario, located at latitude 34.063 and longitude -117.651. Stay updated with localized weather information tailored for Ontario.

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