As of 02:45 PDT

Rosemont, CA weather in September

68°

Rosemont, Sunday, 9 August, 02:45

Clear. Feels like 67°. High 104°, low 68°.

Pressure29.80 inHg

Wind6.2 mph S

Humidity67%

Visibility6.2 mi

Dew point57°

See detailed hourly forecast

In September, Rosemont, CA averages a high of 86.8° and a low of 59°. About 0.4 inches of precipitation fall over the month (1 wet days). The record high is 117.3° (2022) and the record low 46.9° (2019). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	90.9°	60.6°	3%	109.4° (2017)	53.4° (1970)
2	90.7°	61°	7%	107.2° (2017)	53.1° (1960)
3	90.5°	60.8°	2%	104.9° (2017)	51.8° (2000)
4	90.7°	60.4°	0%	107.8° (2022)	50.7° (2000)
5	90.7°	61°	3%	116.2° (2022)	53.2° (1965)
6	90.5°	61°	2%	117.3° (2022)	52° (1973)
7	90.3°	61°	0%	114.6° (2020)	52.2° (1964)
8	89.4°	60.8°	2%	112.5° (2022)	52.7° (1965)
9	88.3°	59.9°	5%	111.2° (2022)	51.6° (1964)
10	87.6°	59.2°	5%	103.8° (2015)	51.8° (1985)
11	88°	59.4°	0%	100.9° (1979)	48.2° (1985)
12	87.4°	59.4°	0%	104.5° (1979)	50.4° (1985)
13	86.4°	59°	0%	104.2° (1971)	51.1° (2005)
14	85.5°	58.5°	3%	104.7° (1971)	50.4° (1970)
15	84.6°	57.6°	7%	102° (1971)	51.4° (1986)
16	84.2°	57.6°	8%	97.3° (1971)	50.7° (2006)
17	84.9°	57.7°	5%	101.8° (1984)	52° (1977)
18	84.2°	58.8°	10%	101.3° (1984)	49.5° (1986)
19	84.2°	58.1°	8%	97.5° (2000)	52.2° (1989)
20	85.6°	58.3°	3%	100.4° (1990)	50.4° (1965)
21	86°	57.7°	3%	98.2° (1987)	50.5° (2004)
22	85.1°	57.9°	8%	99.9° (2009)	50.9° (2013)
23	85.8°	57.6°	3%	99.7° (2021)	51.3° (1968)
24	85.5°	58.5°	5%	101.1° (2024)	52.3° (2023)
25	84.6°	58.5°	10%	95.7° (2019)	51.4° (1986)
26	85.1°	58.3°	7%	98.2° (2009)	50.9° (1982)
27	84.4°	57.9°	3%	99.9° (2020)	48.2° (1971)
28	84.4°	57.7°	7%	101.5° (2020)	48° (1971)
29	84°	57.6°	3%	101.8° (2010)	46.9° (2019)
30	83.3°	57.4°	7%	103.3° (2020)	47.8° (1971)