Ontario (CA)
January
Weather in Ontario, California for January 2026
Your guide to Ontario weather in January - trends and predictions
In general, the average temperature in Ontario at the beginning of January is 16.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 15.7 °F by the end of January.
Ontario experiences moderate rainfall in January, with an average of 7 rainy days and a total precipitation of 47.9 mm.
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Temperatures
Rain 🌧️
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24
Dry days
7
Rainy days
0
Snow days
16°/7°
Temperatures
11 km/h
Avg max wind
44 %
Avg humidity
Ontario Weather January
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Temperatures trend during January in Ontario
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January weather in Ontario day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Partly cloudy | 18° /8° | 0 mm | 5 | |
| Jan. 2 |  Overcast | 20° /8° | 0 mm | 5 | |
| Jan. 3 |  Light rain shower | 15° /7° | 4.5 mm | 4 | |
| Jan. 4 | Overcast | 16° /3° | 0 mm | 4 | |
| Jan. 5 | Partly cloudy | 17° /9° | 0 mm | 5 | |
| Jan. 6 |  Sunny | 17° /10° | 0 mm | 5 | |
| Jan. 7 | Patchy rain possible | 13° /5° | 1 mm | 3 | |
| Jan. 8 |  Cloudy | 14° /6° | 0.2 mm | 4 | |
| Jan. 9 | Sunny | 17° /6° | 0 mm | 5 | |
| Jan. 10 | Sunny | 16° /5° | 0 mm | 5 | |
| Jan. 11 | Patchy rain possible | 15° /3° | 0 mm | 4 | |
| Jan. 12 | Sunny | 15° /4° | 0 mm | 5 | |
| Jan. 13 | Sunny | 14° /7° | 0 mm | 4 | |
| Jan. 14 | Sunny | 15° /6° | 0 mm | 5 | |
| Jan. 15 | Cloudy | 17° /9° | 0 mm | 5 | |
| Jan. 16 | Sunny | 19° /7° | 0 mm | 5 | |
| Jan. 17 | Partly cloudy | 13° /4° | 0 mm | 4 | |
| Jan. 18 | Sunny | 17° /6° | 0 mm | 5 | |
| Jan. 19 | Overcast | 18° /9° | 0 mm | 5 | |
| Jan. 20 | Light rain shower | 15° /6° | 2.2 mm | 4 | |
| Jan. 21 | Light rain shower | 12° /6° | 5.6 mm | 3 | |
| Jan. 22 | Light rain shower | 16° /9° | 14.1 mm | 4 | |
| Jan. 23 | Patchy rain possible | 16° /7° | 0 mm | 4 | |
| Jan. 24 | Overcast | 18° /7° | 0 mm | 5 | |
| Jan. 25 | Patchy rain possible | 14° /6° | 0 mm | 4 | |
| Jan. 26 | Sunny | 13° /5° | 10.4 mm | 4 | |
| Jan. 27 | Sunny | 16° /8° | 9.8 mm | 4 | |
| Jan. 28 | Overcast | 16° /7° | 0 mm | 4 | |
| Jan. 29 | Overcast | 16° /6° | 0 mm | 4 | |
| Jan. 30 | Overcast | 17° /7° | 0 mm | 4 | |
| Jan. 31 | Partly cloudy | 18° /7° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Ontario in January 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 January - FAQ
What are the expected maximum and minimum temperatures in Ontario during January?
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 January?
In January, Ontario can expect light to moderate rainfall, totaling 47.9 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Ontario during January?
The average wind speed in Ontario during January is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in Ontario
Explore the daily rainfall trends and prepare for Ontarios January weather 💧
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