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, 56°F | Humidity: 93% | Dewpoint: 54°F |
| Wind Speed: W 5.8 MPH (5 KT) | Heat Index: 56°F | ||
| Barometer: 29.92 in. | Wind Chill: 55°F |
Weather Forecast
| Tonight: Mostly clear. Patchy fog. Visibility one quarter mile or less at Times. Lows 45 to 52. Light winds. | |
| Lo: 49°F | ||
| Hi: 77°F | Sunday: Mostly sunny. Patchy fog in the morning. Visibility one quarter mile or less at Times in the morning. Highs 73 to 79. Light winds. |
| Lo: 51°F | ||
 | Hi: 81°F | Monday: Mostly sunny. Highs 78 to 83. Light winds. |
| Lo: 53°F | ||
| Hi: 82°F | Tuesday: Mostly sunny. Highs 79 to 84. |
| Lo: 52°F | ||
 | Hi: 74°F | Veterans day: Partly cloudy. Highs 70 to 76. |
| Lo: 48°F | ||
| Hi: 69°F | Thursday: Partly cloudy in the morning...Becoming mostly sunny. Highs 65 to 71. |
| Lo: 44°F | ||
| Hi: 70°F | Friday: Mostly sunny. Highs 66 to 72. |
| Lo: 45°F |
Moon, Sunrise and Sunset
 |
Moon Phase: Waning Gibbous Moon | Civil Twilight: 5:49 AM PST |
Sunrise: 6:15 AM PST |
| Sunset: 4:52 PM PST |
Civil Twilight: 5:18 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 |
