As of 15:47 PDT

Rancho Cucamonga, CA weather in August

96°

Rancho Cucamonga, Sunday, 9 August, 15:47

Clear. Feels like 100°. High 96°, low 69°.

Pressure29.80 inHg

Wind6 mph NW

Humidity37%

Visibility6.2 mi

Dew point66°

See detailed hourly forecast

In August, Rancho Cucamonga, CA averages a high of 90.9° and a low of 66.3°. About 0.2 inches of precipitation fall over the month (1 wet days). The record high is 109.2° (2020) and the record low 50° (1968). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	91.8°	67.3°	0%	101.5° (2017)	59° (1964)
2	91.4°	67.6°	2%	101.5° (2021)	57.6° (1964)
3	91.2°	66.9°	3%	103.1° (2021)	56.5° (1976)
4	91.4°	66.4°	0%	103.6° (1998)	56.5° (1976)
5	92.3°	66.7°	0%	104.9° (1997)	55.9° (1991)
6	91.6°	66.9°	2%	102.6° (2018)	56.8° (1991)
7	91.4°	66.6°	0%	105.6° (2018)	55.6° (1976)
8	91.8°	66°	0%	99.5° (2025)	57.9° (1999)
9	91.6°	66.6°	3%	101.8° (2018)	56.3° (2010)
10	90.9°	66.7°	3%	100° (2012)	57° (1999)
11	91°	66.7°	0%	99.3° (2000)	55.8° (2010)
12	90.9°	66.9°	0%	100.4° (2012)	55.8° (2010)
13	91°	66.7°	2%	104° (1996)	56.7° (1988)
14	90.1°	66.6°	0%	104° (2020)	56.8° (1968)
15	90.1°	66°	3%	109.2° (2020)	55.8° (1976)
16	90.1°	66°	3%	102.6° (2015)	54.7° (1972)
17	89.8°	65.8°	3%	102.9° (2020)	56.3° (2006)
18	88.7°	65.8°	5%	108.5° (2020)	55.6° (1978)
19	88.3°	65.3°	5%	106.7° (2020)	57° (1976)
20	88.9°	64.6°	5%	103.8° (2020)	56.7° (1972)
21	89.1°	64.9°	2%	102.2° (2025)	56.1° (1979)
22	89.6°	64.8°	0%	102° (2025)	50° (1968)
23	90.7°	64.8°	0%	100.6° (1998)	56.1° (1983)
24	90.7°	65.3°	0%	104.2° (2010)	55.4° (1978)
25	90.7°	66.2°	2%	104.7° (1985)	56.8° (1960)
26	91°	66.4°	3%	103.1° (1981)	55.2° (1990)
27	92.1°	66.4°	3%	104.5° (1981)	53.6° (1973)
28	93°	66.6°	0%	104.2° (1981)	55.4° (1973)
29	93°	67.3°	2%	104.2° (1998)	55° (2010)
30	91.9°	67.6°	0%	106° (2017)	55.8° (2010)
31	90.9°	66.2°	3%	105.8° (2022)	55° (1964)