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Weather in Ontario, California for June 2026

Your guide to Ontario weather in June - trends and predictions

    Official Weather Alert ⚠️

  • Beach Hazards Statement - See hour by hour.

    • Temperatures

  • So far, June 2026 in Ontario shows a warmer trend than usual by 3 °F.

  • The forecast for the upcoming days in Ontario predicts a temperature of 30 °F, which is slightly above the historical average.

  • In general, the average temperature in Ontario at the beginning of June is 27.3 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 30.1 °F by the end of June.

    • Rain 🌧️

  • Precipitation in Ontario during June 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
30
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/14°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
50 %
Avg humidity

Ontario Weather June

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

Temperatures trend during June in Ontario

See the weather trend as well as the moving average line

June weather in Ontario day by day

Click on a date for more information
May July
Date Weather Temperatures Rain UV More
Jun. 1 Sunny
Sunny
 26° /14° 0.1 mm 8
Jun. 2 Sunny
Sunny
 27° /12° 0 mm 8
Jun. 3 Sunny
Sunny
 28° /12° 0 mm 9
Jun. 4 Sunny
Sunny
 29° /13° 0 mm 9
Jun. 5 Partly cloudy
Partly cloudy
 27° /13° 0 mm 9
Jun. 6 Sunny
Sunny
 27° /12° 0.2 mm 8
Jun. 7 Sunny
Sunny
 27° /13° 0.5 mm 8
Jun. 8 Sunny
Sunny
 27° /13° 0 mm 9
Jun. 9 Partly cloudy
Partly cloudy
 27° /14° 0 mm 9
Jun. 10 Sunny
Sunny
 29° /14° 0 mm 8
Jun. 11 Sunny
Sunny
 29° /14° 0.6 mm 8
Jun. 12 Sunny
Sunny
 29° /15° 0.2 mm 8
Jun. 13 Sunny
Sunny
 29° /15° 0 mm 8
Jun. 14 Sunny
Sunny
 30° /14° 0 mm 9
Jun. 15 Sunny
Sunny
 36° /17° 0 mm 11.3
Jun. 16 Sunny
Sunny
 33° /20° 0 mm 11.4
Jun. 17 Sunny
Sunny
 32° /19° 0 mm 11.7
Jun. 18 Sunny
Sunny
 30° /18° 0 mm 11.9
Jun. 19 Sunny
Sunny
 29° /18° 0 mm 0
Jun. 20 Sunny
Sunny
 27° /16° 0 mm 6
Jun. 21 Sunny
Sunny
 27° /15° 0 mm 6
Jun. 22 Sunny
Sunny
 30° /16° 0 mm 6
Jun. 23 Sunny
Sunny
 32° /18° 0 mm 6
Jun. 24 Sunny
Sunny
 31° /19° 0 mm 6
Jun. 25 Sunny
Sunny
 29° /19° 0 mm 6
Jun. 26 Sunny
Sunny
 27° /16° 0 mm 6
Jun. 27 Sunny
Sunny
 27° /16° 0 mm 6
Jun. 28 Sunny
Sunny
 30° /17° 0 mm 6
Jun. 29 Sunny
Sunny
 32° /16° 0 mm 8
Jun. 30 Sunny
Sunny
 35° /19° 0 mm 9
Next
Important Notice
Our weather forecast for Ontario in June 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 June - FAQ

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

Enjoy moderate daytime temperatures of up to 28° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Ontario during June?

Rainfall in Ontario during June 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 June?

The average wind speed in Ontario during June is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

UV exposure in Ontario during June

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

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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