As of 05:19 PDT

Rancho Cucamonga, CA weather in May

81°

Rancho Cucamonga, Sunday, 9 August, 05:19

Mostly clear. Feels like 80°. High 100°, low 73°.

Pressure29.88 inHg

Wind3.1 mph W

Humidity25%

Visibility6.2 mi

Dew point46°

See detailed hourly forecast

In May, Rancho Cucamonga, CA averages a high of 76.1° and a low of 53.5°. About 0.7 inches of precipitation fall over the month (3 wet days). The record high is 103.1° (1984) and the record low 38.5° (1967). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	74.5°	51.4°	7%	91.2° (2014)	38.5° (1967)
2	75.4°	51.6°	7%	95.4° (2004)	41.7° (1967)
3	75.6°	52.3°	7%	96.4° (2004)	42.6° (1967)
4	74.3°	52.5°	15%	92.1° (1987)	42.8° (1969)
5	72.5°	52.3°	23%	95.7° (1990)	40.8° (1964)
6	72.3°	51.6°	22%	95° (1987)	39.9° (1975)
7	73.4°	51.8°	17%	95° (2020)	38.7° (1964)
8	74.3°	52.3°	13%	93.9° (1984)	40.6° (1965)
9	74.3°	52.3°	12%	95° (2025)	43.2° (1979)
10	74.3°	52.7°	8%	98.2° (2025)	40.5° (2003)
11	75.7°	52.3°	2%	95.9° (1988)	44.4° (2022)
12	77.2°	52.7°	8%	95.2° (1976)	42.6° (1967)
13	77.7°	53.4°	12%	97° (2013)	42.1° (1998)
14	77.2°	54.1°	3%	95° (2014)	44.8° (1968)
15	76.3°	53.8°	8%	99.3° (2014)	42.8° (1998)
16	77°	53.8°	15%	95.5° (2014)	44.6° (1962)
17	77.2°	54°	8%	98.1° (2008)	42.4° (1962)
18	77.2°	54°	8%	97.7° (2008)	41.7° (1977)
19	77.4°	53.6°	8%	94.5° (2008)	41.9° (1974)
20	76.3°	54.1°	12%	92.8° (1988)	42.8° (1974)
21	76.3°	54°	10%	96.8° (2000)	43.3° (1972)
22	76.1°	54°	8%	93° (1988)	43.7° (1975)
23	75.6°	54.3°	8%	95° (2001)	45.9° (1971)
24	76.3°	54.3°	3%	90.5° (2021)	42.6° (1980)
25	75.6°	54.5°	8%	96.6° (1974)	43.7° (1980)
26	76.3°	54.3°	7%	95.9° (1974)	43.9° (1980)
27	77.4°	54.1°	7%	96.3° (1968)	44.1° (2019)
28	78.8°	54.9°	5%	99.9° (1973)	45.3° (1971)
29	79°	55.4°	5%	103.1° (1984)	45.3° (1980)
30	79.7°	55.8°	3%	95.5° (2025)	44.8° (2011)
31	79.5°	55.8°	5%	94.8° (2025)	47.7° (1988)