Historical Weather in Rancho Cucamonga, CA
See 55+ years of weather history for any date in Rancho Cucamonga going back to 1970.
Part of California weather history
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Today in Rancho Cucamonga Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for Rancho Cucamonga, CA, based on 55+ years of weather data.
Warmest MonthAugustAvg High: 93°F / Low: 63°F
Coldest MonthJanuaryAvg High: 66°F / Low: 43°F
Jan
66°/ 43°
💧 12.9"
Feb
68°/ 44°
💧 14.7"
Mar
70°/ 47°
💧 10.7"
Apr
74°/ 49°
💧 5.7"
May
79°/ 53°
💧 4.6"
Jun
87°/ 58°
💧 1.5"
Jul
93°/ 63°
💧 2.4"
Aug
93°/ 63°
💧 8.4"
Sep
90°/ 62°
💧 6.3"
Oct
81°/ 55°
💧 5.8"
Nov
73°/ 47°
💧 8.1"
Dec
67°/ 43°
💧 10.9"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Rancho Cucamonga Temperature Records
- Record High: The hottest temperature ever recorded in Rancho Cucamonga, CA is 121°F, set on September 6, 2020.
- Record Low: The coldest temperature ever recorded in Rancho Cucamonga, CA is 19°F, set on March 12, 1986.
- Data Coverage: Based on 29 years of data from NOAA weather station: ONTARIO INTL AP.
All-Time Record High
121°F
September 6, 2020
All-Time Record Low
19°F
March 12, 1986
Monthly Temperature Records in Rancho Cucamonga
| Month | Record High | Record Low |
|---|---|---|
| January | 93°F(2021) | 20°F(2007) |
| February | 95°F(2016) | 23°F(1990) |
| March | 97°F(2007) | 19°F(1986) |
| April | 106°F(2004) | 28°F(1999) |
| May | 106°F(2003) | 32°F(1988) |
| June | 115°F(2016) | 36°F(1988) |
| July | 120°F(2018) | 42°F(2010) |
| August | 115°F(2017) | 45°F(2010) |
| September | 121°F(2020) | 41°F(2007) |
| October | 111°F(2020) | 33°F(2009) |
| November | 100°F(2010) | 27°F(2000) |
| December | 92°F(2021) | 20°F(1987) |
Rancho Cucamonga Snow RecordsSee the top 10 snowiest days ever recorded
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