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Rancho Cucamonga, CA weather and climate

San Bernardino County, CA · population 174,693 · about 1,427 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Rancho Cucamonga's own coordinates.

The year at a glance

Sunny days
285
clear or partly cloudy, per year
Precipitation
12 in
per year
Wet days
35
rain or snow per year
Snowfall
21 in
per year
Hot days
91
above 90 °F
Freezing nights
3
at or below 32 °F
Humidity
59%
average relative
Average temperature
66 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
406080JanMarMayJulSepNovDaily high, Jan: 68 °FDaily high, Feb: 68 °FDaily high, Mar: 72 °FDaily high, Apr: 76 °FDaily high, May: 80 °FDaily high, Jun: 86 °FDaily high, Jul: 93 °FDaily high, Aug: 95 °FDaily high, Sep: 91 °FDaily high, Oct: 83 °FDaily high, Nov: 75 °FDaily high, Dec: 67 °FDaily low, Jan: 44 °FDaily low, Feb: 45 °FDaily low, Mar: 48 °FDaily low, Apr: 51 °FDaily low, May: 55 °FDaily low, Jun: 59 °FDaily low, Jul: 64 °FDaily low, Aug: 64 °FDaily low, Sep: 63 °FDaily low, Oct: 56 °FDaily low, Nov: 48 °FDaily low, Dec: 43 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high686872768086939591837567
Daily low444548515559646463564843

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.01.02.0JanMarMayJulSepNovRancho Cucamonga, Jan: 2.4 inRancho Cucamonga, Feb: 2.7 inRancho Cucamonga, Mar: 1.7 inRancho Cucamonga, Apr: 0.8 inRancho Cucamonga, May: 0.4 inRancho Cucamonga, Jun: 0.1 inRancho Cucamonga, Jul: 0.3 inRancho Cucamonga, Aug: 0.2 inRancho Cucamonga, Sep: 0.2 inRancho Cucamonga, Oct: 0.6 inRancho Cucamonga, Nov: 0.7 inRancho Cucamonga, Dec: 1.7 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Rancho Cucamonga2.42.71.70.80.40.10.30.20.20.60.71.7

Monthly sunny days

Days each month with clear or partly cloudy skies.

0102030JanMarMayJulSepNovRancho Cucamonga, Jan: 19 daysRancho Cucamonga, Feb: 16 daysRancho Cucamonga, Mar: 19 daysRancho Cucamonga, Apr: 22 daysRancho Cucamonga, May: 24 daysRancho Cucamonga, Jun: 28 daysRancho Cucamonga, Jul: 29 daysRancho Cucamonga, Aug: 30 daysRancho Cucamonga, Sep: 29 daysRancho Cucamonga, Oct: 27 daysRancho Cucamonga, Nov: 23 daysRancho Cucamonga, Dec: 21 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Rancho Cucamonga191619222428293029272321

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About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).