Rancho Fontana Weather Forecast
- 66
- 95
Sunny
- 68
- 98
Hot
- 73
- 102
Hot
- 73
- 104
Hot
- 71
- 102
Hot
- 69
- 99
Hot
Today 29 Jul San Bernardino and Riverside County Valleys-The Inland Empire
Mostly sunny. Highs 93 to 99. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.
Tonight 29 Jul San Bernardino and Riverside County Valleys-The Inland Empire
Mostly clear. Lows 60 to 66. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.
Rancho Fontana Temperature Statistics
July Temperature
Ontario International Airport (7.5 miles)
Lowest 3 July, 2026
59.6 °FAverage July
81.3 °FHighest 15 July, 2026
102.7 °F
Climate (2021–2026)
Ontario International Airport (7.5 miles)
Average Low 2021–2026
55.8 °FAverage 2021–2026
67.1 °FAverage High 2021–2026
79.3 °F