Cucamonga-Guasti Regional Park Weather Forecast
- 61
- 86
Mostly Sunny
- 63
- 89
Becoming Sunny
- 63
- 92
Sunny
- 63
- 93
Mostly Sunny
- 67
- 94
Mostly Sunny
- 71
- 97
Hot
- 73
- 100
Hot
Today 3 Jul San Bernardino and Riverside County Valleys-The Inland Empire
Patchy fog this morning. Mostly sunny. Highs 86 to 93. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph this afternoon.
Tonight 3 Jul San Bernardino and Riverside County Valleys-The Inland Empire
Mostly clear. Lows 53 to 61. Areas of Winds west to 10 Mph this evening becoming light.
Cucamonga-Guasti Regional Park Temperature Statistics
July Temperature
Ontario International Airport (1.2 miles)
Lowest 1 July, 2025
61 °FAverage July
74 °FHighest 1 July, 2025
90 °F
Climate (2020–Present)
Ontario International Airport (1.2 miles)
Average Low 2020–2025
55.5 °FAverage 2020–2025
66.7 °FAverage High 2020–2025
79.2 °F