Rancho Cucamonga city, California

Official LSAD Designation: Rancho Cucamonga city • Census GEOID: 0659451 • San Bernardino County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Rancho Cucamonga city.

Reference Weather Station: ONTARIO INTL AP, CA US (ID: USW00003102) • Located 5.5 miles from community center • Elevation: 289.3 m

Month	Average High (°F)	Average Low (°F)	Mean Temp (°F)	Precipitation (in)
January	67.7°	44.6°	56.1°	2.57"
February	68.1°	46.2°	57.1°	3.07"
March	71.7°	48.7°	60.2°	1.64"
April	75.7°	51.1°	63.4°	0.76"
May	79.8°	55.6°	67.7°	0.30"
June	86.4°	60.0°	73.2°	0.02"
July	93.8°	64.7°	79.2°	0.05"
August	94.9°	65.2°	80.1°	0.03"
September	91.3°	63.8°	77.6°	0.10"
October	82.6°	57.1°	69.8°	0.41"
November	74.7°	49.0°	61.9°	0.80"
December	66.9°	43.6°	55.2°	1.89"

2010–2025, completed calendar years only.

NOAA station ONTARIO INTL AP, CA US (ID: USW00003102) • 5.5 miles from community center .

This is the same reference station used for monthly normals.

Show annual mean of daily highs and lows

Annual mean Annual mean of daily highs Annual mean of daily lows

Annual temperature data table (°F)

Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year	Annual mean (°F)	Annual mean of daily highs (°F)	Annual mean of daily lows (°F)
2010	64.3	76.5	52.1
2011	64.3	76.8	51.8
2012	67.0	79.8	54.1
2013	66.8	79.8	53.8
2014	69.2	82.0	56.5
2015	68.4	81.1	55.6
2016	67.4	80.6	54.2
2017	68.2	81.0	55.3
2018	67.8	80.4	55.1
2019	67.3	79.3	55.3
2020	68.3	81.2	55.3
2021	67.8	80.5	55.1
2022	67.5	80.2	54.8
2023	64.8	76.4	53.3
2024	66.5	78.4	54.6
2025	67.4	79.4	55.4

Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.