Ontario, CA Weather
Ontario, CA climate is warm during summer when temperatures tend to be in the 70's and cool during winter when temperatures tend to be in the 50's.
The warmest month of the year is August with an average maximum temperature of 89.20 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 41.00 degrees Fahrenheit.
Temperature variations between night and day tend to be relatively big during summer with a difference that can reach 30 degrees Fahrenheit, and moderate during winter with an average difference of 26 degrees Fahrenheit.
The annual average precipitation at Ontario is 16.96 Inches. Winter months tend to be wetter than summer months. The wettest month of the year is February with an average rainfall of 4.05 Inches.
Weather Data
Current Conditions
|
Fog And Mist, 53°F | Humidity: 89% | Dewpoint: 50°F |
| Wind Speed: W 4.6 MPH (4 KT) | Heat Index: 53°F | ||
| Barometer: 30.00 in. | Wind Chill: 52°F |
Weather Forecast
 | Tonight: Partly cloudy. Lows 41 to 48. Light winds. | |
| Lo: 45°F | ||
 | Hi: 64°F | Saturday: Partly cloudy. Highs 60 to 67. Light winds. |
| Lo: 45°F | ||
 | Hi: 67°F | Sunday: Mostly sunny. Highs 63 to 70. Light winds. |
| Lo: 47°F | ||
| Hi: 74°F | Monday: Mostly sunny. Highs 70 to 76. |
| Lo: 48°F | ||
| Hi: 77°F | Tuesday: Sunny. Highs 73 to 79. |
| Lo: 49°F | ||
| Hi: 77°F | Wednesday: Sunny. Highs 73 to 80. |
| Lo: 50°F | ||
| Hi: 77°F | Thanksgiving day: Sunny. Highs 73 to 79. |
| Lo: 50°F |
Moon, Sunrise and Sunset
 |
Moon Phase: Waxing Crescent Moon | Civil Twilight: 6:01 AM PST |
Sunrise: 6:28 AM PST |
| Sunset: 4:43 PM PST |
Civil Twilight: 5:10 PM PST |
Normal Climate
Normal Temperatures
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max °F | 67.6 | 69.0 | 69.1 | 74.1 | 76.7 | 82.3 | 88.7 | 89.2 | 86.7 | 80.2 | 73.1 | 68.3 | 77.1 |
| Mean °F | 54.6 | 56.3 | 56.9 | 60.5 | 64.1 | 68.7 | 73.8 | 74.2 | 72.4 | 66.4 | 59.3 | 54.7 | 63.5 |
| Min °F | 41.5 | 43.5 | 44.6 | 46.9 | 51.5 | 55.1 | 58.8 | 59.2 | 58.0 | 52.6 | 45.4 | 41.0 | 49.8 |
Normal Precipitation
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inch | 4.02 | 4.05 | 3.45 | 0.73 | 0.25 | 0.05 | 0.00 | 0.13 | 0.29 | 0.66 | 1.29 | 2.04 | 16.96 |
