Guasti Weather Forecast
- 58
- 79
Increasing Clouds
- 57
- 79
Partly Sunny
- 57
- 81
Mostly Sunny
- 59
- 83
Partly Sunny
- 60
- 87
Partly Sunny
- 62
- 89
Mostly Sunny
Today 29 Jun San Bernardino and Riverside County Valleys-The Inland Empire
Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 76 to 82. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.
Tonight 29 Jun San Bernardino and Riverside County Valleys-The Inland Empire
Partly cloudy in the evening. Becoming mostly cloudy overnight with patchy fog. Lows 51 to 57. Areas of Winds southwest 10 to 15 Mph with Gusts to 25 Mph becoming south overnight.
Guasti Temperature Statistics
June Temperature
Ontario International Airport (0.6 miles)
Lowest 21 June, 2026
56.6 °FAverage June
74.5 °FHighest 12 June, 2026
99.6 °F
Climate (2021–2026)
Ontario International Airport (0.6 miles)
Average Low 2021–2026
55.8 °FAverage 2021–2026
67.1 °FAverage High 2021–2026
79.3 °F