Ontario Weather Forecast
- 46
- 66
Mostly Sunny
- 48
- 70
Partly Sunny
- 50
- 75
Partly Sunny
- 52
- 79
Mostly Sunny
- 52
- 77
Mostly Sunny
- 49
- 74
Mostly Sunny
- 43
- 65
Partly Sunny
Today 2 Dec San Bernardino and Riverside County Valleys-The Inland Empire
Mostly sunny. Highs 65 to 69. Areas of Winds southeast to 10 Mph becoming west this afternoon.
Ontario Temperature Statistics
December Temperature
Ontario International Airport (3.7 miles)
Lowest
–Average December
–Highest
–
Climate (2018–Present)
Ontario International Airport (3.7 miles)
Average Low 2018–2023
56 °FAverage 2018–2023
66.5 °FAverage High 2018–2023
79.2 °F