As of 06:35 PDT

Rialto, CA weather in August

81°

Rialto, Sunday, 9 August, 06:35

Clear. Feels like 80°. High 100°, low 71°.

Pressure29.88 inHg

Wind2 mph W

Humidity31%

Visibility6.2 mi

Dew point48°

See detailed hourly forecast

In August, Rialto, CA averages a high of 91.3° and a low of 66.2°. About 0.2 inches of precipitation fall over the month (1 wet days). The record high is 109.6° (2020) and the record low 48.9° (1968). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	92.1°	67.3°	0%	103.1° (2020)	57° (1998)
2	91.9°	67.5°	2%	103.3° (2021)	57.2° (1964)
3	91.8°	67.1°	3%	104.5° (2021)	54.9° (1976)
4	91.9°	66.4°	0%	105.3° (1998)	55.8° (1976)
5	92.8°	66.9°	0%	107.1° (2024)	54.3° (1991)
6	92.1°	66.9°	2%	104.5° (2018)	55.4° (1991)
7	91.9°	66.2°	0%	108.1° (2018)	54.7° (1991)
8	92.3°	66.2°	0%	101.7° (2025)	56.7° (1999)
9	92.1°	66.4°	3%	103.3° (2018)	56.1° (2010)
10	91.4°	66.7°	3%	102.2° (2012)	55.6° (1999)
11	91.6°	66.7°	0%	100.8° (2012)	55.8° (1999)
12	91.2°	66.9°	0%	101.8° (2022)	56.5° (1999)
13	91.6°	66.6°	2%	104.7° (1996)	57° (1985)
14	90.5°	66.2°	0%	104.7° (2020)	54.9° (1968)
15	90.3°	65.8°	3%	109° (2020)	54.3° (1976)
16	90.5°	66°	3%	104.4° (2015)	53.6° (1972)
17	90.3°	65.8°	3%	103.3° (2020)	55.8° (1968)
18	89.1°	65.7°	5%	109.6° (2020)	54.1° (1976)
19	88.7°	65.1°	5%	108° (2020)	55.2° (1980)
20	89.2°	64.6°	5%	105.4° (2020)	56.5° (1972)
21	89.6°	64.6°	2%	105.1° (2025)	55.4° (1979)
22	90°	64.8°	0%	104.2° (2025)	48.9° (1968)
23	91.2°	64.6°	0%	101.5° (2025)	54° (1983)
24	91.2°	65.5°	0%	106.3° (2010)	55.2° (1983)
25	91°	66.4°	2%	104.5° (1985)	55.9° (1983)
26	91.4°	66.4°	3%	102.9° (2011)	54.3° (1990)
27	92.5°	66.4°	3%	104.5° (1981)	53.6° (1973)
28	93.7°	65.8°	0%	106.2° (2017)	54° (1973)
29	93.7°	66.7°	2%	106.7° (2017)	54° (2010)
30	92.5°	66.9°	0%	107.6° (2017)	54.5° (2010)
31	91.4°	66°	3%	107.4° (2022)	52.7° (1964)