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Weather in Ontario, California for March 2026

Your guide to Ontario weather in March - trends and predictions

    Official Weather Alert ⚠️

  • Heat Advisory - See hour by hour.

    • Temperatures

  • Until now, March 2026 in Ontario has been significantly warmer than historical averages.

  • The forecast for the next days in Ontario predicts the temperature to be 30.4 °F, significantly warmer than the historical average.

  • In general, the average temperature in Ontario at the beginning of March is 14.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 26.6 °F by the end of March.

    • Rain 🌧️

  • The climate of Ontario in March is notably wet, with an average of 12 rainy days, and a total of 228 mm of precipitation.

    • More

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

Average dry days
19
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/7°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Ontario Weather March

Move between months or click on a day
February
April
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
16°
2
Light rain shower
12°
3
Patchy rain possible
16°
4
Sunny
17°
5
Partly cloudy
16°
6
Light rain
11°
7
Patchy rain possible
13°
8
Sunny
19°
9
Overcast
19°
10
Partly cloudy
18°
11
Partly cloudy
18°
12
Patchy rain possible
20°
13
Sunny
19°
14
Sunny
15°
15
Patchy rain possible
20°
16
Patchy rain possible
17°
17
Weather Alert Sunny
40°
18
Weather Alert Sunny
35°
19
Sunny
35°
20
Sunny
35°
21
Sunny
32°
22
Sunny
28°
23
Sunny
24°
24
Sunny
24°
25
Sunny
28°
26
Sunny
30°
27
Sunny
33°
28
Sunny
32°
29
Sunny
26°
30
Sunny
24°
31
Patchy light rain with thunder
13°

Temperatures trend during March in Ontario

See the weather trend as well as the moving average line

March weather in Ontario day by day

Click on a date for more information
February April
Date Weather Temperatures Rain UV More
Mar. 1 Patchy rain possible
Patchy rain possible
 16° /9° 0.4 mm 3
Mar. 2 Light rain shower
Light rain shower
 12° /6° 6.6 mm 3
Mar. 3 Patchy rain possible
Patchy rain possible
 16° /6° 0.3 mm 4
Mar. 4 Sunny
Sunny
 17° /7° 0 mm 5
Mar. 5 Partly cloudy
Partly cloudy
 16° /5° 19.8 mm 4
Mar. 6 Light rain
Light rain
 11° /5° 44.4 mm 3
Mar. 7 Patchy rain possible
Patchy rain possible
 13° /4° 2.3 mm 3
Mar. 8 Sunny
Sunny
 19° /5° 0 mm 5
Mar. 9 Overcast
Overcast
 19° /9° 0 mm 5
Mar. 10 Partly cloudy
Partly cloudy
 18° /8° 0 mm 5
Mar. 11 Partly cloudy
Partly cloudy
 18° /7° 9.3 mm 4
Mar. 12 Patchy rain possible
Patchy rain possible
 20° /8° 18 mm 4
Mar. 13 Sunny
Sunny
 19° /10° 34.8 mm 4
Mar. 14 Sunny
Sunny
 15° /9° 4.8 mm 4
Mar. 15 Patchy rain possible
Patchy rain possible
 20° /8° 0 mm 4
Mar. 16 Patchy rain possible
Patchy rain possible
 17° /5° 0.2 mm 4
Mar. 17 Sunny
Sunny
 40° /20° 0 mm 1.8
Mar. 18 Sunny
Sunny
 35° /22° 0 mm 1.8
Mar. 19 Sunny
Sunny
 35° /21° 0 mm 1.9
Mar. 20 Sunny
Sunny
 35° /21° 0 mm 1.9
Mar. 21 Sunny
Sunny
 32° /20° 0 mm 0
Mar. 22 Sunny
Sunny
 28° /18° 0 mm 6
Mar. 23 Sunny
Sunny
 24° /16° 0 mm 5
Mar. 24 Sunny
Sunny
 24° /15° 0 mm 5
Mar. 25 Sunny
Sunny
 28° /14° 0 mm 6
Mar. 26 Sunny
Sunny
 30° /17° 0 mm 6
Mar. 27 Sunny
Sunny
 33° /18° 0 mm 6
Mar. 28 Sunny
Sunny
 32° /20° 0 mm 7
Mar. 29 Sunny
Sunny
 26° /16° 0 mm 6
Mar. 30 Sunny
Sunny
 24° /15° 0 mm 5
Mar. 31 Patchy light rain with thunder
Patchy light rain with thunder
 13° /6° 12.8 mm 3
Next
Important Notice
Our weather forecast for Ontario in March 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 March - FAQ

What are the expected maximum and minimum temperatures in Ontario during March?

Enjoy moderate daytime temperatures of up to 16° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Ontario during March?

Significant rainfall exceeding 228 mm is expected in Ontario during March, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Ontario during March?

The average wind speed in Ontario during March is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

March rainfall patterns in Ontario

Explore the daily rainfall trends and prepare for Ontarios March weather 💧
Typically, Ontario has 12 rainy days in March with a total of 228 mm of rainfall.

UV exposure in Ontario during March

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

Quick links

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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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