Phoenix · United States

Phoenix in September: every year compared

In September, Phoenix averages highs of 37.7 °C and lows of 24.6 °C, with 24 mm of precipitation. The warmest September was 2024 (33.4 °C), the coldest 1986 (26.8 °C).

Avg. highAvg. high 37.7 °C

Avg. lowAvg. low 24.6 °C

PrecipitationPrecipitation 24 mm

Rainy daysRainy days 3

Day by day through September

Normal high and low for each day of September in Phoenix.

Normal high and low, day by dayNormal 1991–2020

Every September in Phoenix, ranked

86 months of September since 1940. The last one, 2025, ranks 24 of 86 (−0.1 °C vs normal).

194019832025

2025 · 31.2 °C · −0.1 °C vs normal · rank 24 of 86

Warmest years

1202433.4 °C
2201833.1 °C
3200132.9 °C
4202032.9 °C
5197932.8 °C

Coldest years

1198626.8 °C
2197026.9 °C
3198527.1 °C
4196127.2 °C
5196527.4 °C

All 86 years in a table

Year	Mean temperature	Daytime highs	Night lows	Precipitation	Hot days (30 °C+)	Rainy days
2025	31.2 °C	36.8 °C	25.5 °C	46 mm	27 days	7 days
2024	33.4 °C	40.0 °C	26.2 °C	1 mm	30 days	0 days
2023	31.5 °C	37.9 °C	24.4 °C	27 mm	30 days	4 days
2022	32.4 °C	37.9 °C	26.5 °C	26 mm	29 days	5 days
2021	31.2 °C	37.2 °C	25.2 °C	52 mm	26 days	3 days
2020	32.9 °C	39.6 °C	25.4 °C	1 mm	30 days	0 days
2019	31.1 °C	36.6 °C	25.6 °C	64 mm	28 days	8 days
2018	33.1 °C	39.4 °C	26.0 °C	9 mm	30 days	1 day
2017	30.6 °C	37.0 °C	23.6 °C	5 mm	28 days	2 days
2016	30.1 °C	36.1 °C	24.0 °C	15 mm	30 days	5 days
2015	31.8 °C	37.5 °C	25.9 °C	22 mm	30 days	2 days
2014	31.0 °C	36.6 °C	25.5 °C	86 mm	29 days	8 days
2013	30.9 °C	36.9 °C	24.8 °C	24 mm	28 days	3 days
2012	31.2 °C	37.5 °C	25.0 °C	30 mm	29 days	4 days
2011	32.3 °C	38.9 °C	25.5 °C	11 mm	30 days	5 days
2010	32.5 °C	39.5 °C	24.7 °C	10 mm	30 days	2 days
2009	32.3 °C	38.5 °C	25.7 °C	2 mm	30 days	1 day
2008	31.6 °C	37.9 °C	25.0 °C	27 mm	30 days	3 days
2007	31.8 °C	37.7 °C	25.5 °C	10 mm	29 days	2 days
2006	29.8 °C	35.7 °C	23.5 °C	14 mm	30 days	3 days
2005	31.8 °C	38.3 °C	24.7 °C	0 mm	30 days	0 days
2004	29.9 °C	36.4 °C	23.3 °C	69 mm	26 days	3 days
2003	31.2 °C	38.3 °C	24.5 °C	38 mm	30 days	2 days
2002	30.6 °C	37.1 °C	24.0 °C	59 mm	29 days	6 days
2001	32.9 °C	39.5 °C	25.7 °C	2 mm	30 days	1 day
2000	32.5 °C	39.1 °C	25.4 °C	0 mm	30 days	0 days
1999	30.6 °C	37.3 °C	24.1 °C	23 mm	30 days	4 days
1998	31.2 °C	37.7 °C	24.4 °C	18 mm	29 days	3 days
1997	32.6 °C	38.6 °C	26.3 °C	12 mm	30 days	4 days
1996	28.2 °C	34.0 °C	22.3 °C	78 mm	27 days	8 days
1995	32.1 °C	38.0 °C	25.9 °C	27 mm	27 days	2 days
1994	31.5 °C	37.9 °C	24.9 °C	12 mm	30 days	4 days
1993	30.4 °C	38.0 °C	22.6 °C	5 mm	30 days	2 days
1992	29.8 °C	37.4 °C	22.2 °C	47 mm	30 days	2 days
1991	30.4 °C	37.0 °C	23.5 °C	13 mm	30 days	4 days
1990	29.8 °C	36.3 °C	23.8 °C	48 mm	29 days	6 days
1989	31.4 °C	38.4 °C	24.1 °C	3 mm	30 days	1 day
1988	29.5 °C	37.3 °C	21.6 °C	12 mm	29 days	3 days
1987	29.8 °C	36.6 °C	22.9 °C	11 mm	30 days	4 days
1986	26.8 °C	33.5 °C	20.1 °C	65 mm	24 days	5 days
1985	27.1 °C	33.8 °C	20.6 °C	49 mm	24 days	5 days
1984	30.0 °C	36.2 °C	23.8 °C	71 mm	29 days	8 days
1983	30.9 °C	36.6 °C	25.7 °C	120 mm	27 days	8 days
1982	29.4 °C	35.7 °C	23.2 °C	38 mm	25 days	6 days
1981	30.7 °C	37.0 °C	24.4 °C	24 mm	30 days	4 days
1980	31.2 °C	38.1 °C	23.9 °C	6 mm	30 days	3 days
1979	32.8 °C	39.6 °C	25.2 °C	4 mm	30 days	2 days
1978	30.3 °C	36.5 °C	23.9 °C	4 mm	29 days	1 day
1977	30.6 °C	36.7 °C	24.6 °C	19 mm	29 days	2 days
1976	27.7 °C	33.9 °C	22.0 °C	84 mm	26 days	8 days
1975	30.5 °C	37.1 °C	23.7 °C	13 mm	30 days	3 days
1974	30.3 °C	36.9 °C	24.0 °C	9 mm	30 days	3 days
1973	30.1 °C	37.8 °C	21.2 °C	0 mm	30 days	0 days
1972	29.8 °C	36.8 °C	22.6 °C	6 mm	30 days	3 days
1971	30.0 °C	37.1 °C	22.9 °C	39 mm	29 days	4 days
1970	26.9 °C	33.7 °C	20.3 °C	161 mm	27 days	3 days
1969	30.8 °C	37.7 °C	23.6 °C	21 mm	30 days	2 days
1968	30.3 °C	37.8 °C	22.3 °C	0 mm	30 days	0 days
1967	29.4 °C	35.8 °C	23.0 °C	60 mm	29 days	1 day
1966	28.8 °C	35.3 °C	22.5 °C	47 mm	26 days	5 days
1965	27.4 °C	34.3 °C	20.3 °C	33 mm	24 days	4 days
1964	28.5 °C	35.1 °C	22.2 °C	36 mm	29 days	6 days
1963	31.1 °C	38.2 °C	24.0 °C	23 mm	30 days	6 days
1962	30.0 °C	36.3 °C	23.7 °C	42 mm	28 days	7 days
1961	27.2 °C	33.9 °C	20.3 °C	73 mm	25 days	4 days
1960	31.3 °C	38.5 °C	23.8 °C	4 mm	30 days	1 day
1959	29.9 °C	36.3 °C	23.2 °C	11 mm	29 days	2 days
1958	29.7 °C	36.0 °C	23.3 °C	44 mm	28 days	5 days
1957	30.5 °C	37.9 °C	22.3 °C	1 mm	30 days	0 days
1956	31.5 °C	39.3 °C	22.6 °C	2 mm	30 days	1 day
1955	30.1 °C	37.8 °C	21.1 °C	1 mm	30 days	0 days
1954	31.3 °C	37.8 °C	23.7 °C	4 mm	30 days	1 day
1953	30.1 °C	38.6 °C	20.5 °C	0 mm	30 days	0 days
1952	31.0 °C	38.0 °C	23.4 °C	24 mm	29 days	2 days
1951	29.2 °C	37.6 °C	20.5 °C	0 mm	30 days	0 days
1950	28.4 °C	36.0 °C	20.3 °C	3 mm	30 days	1 day
1949	30.1 °C	36.6 °C	24.0 °C	90 mm	30 days	7 days
1948	31.1 °C	38.0 °C	23.3 °C	1 mm	30 days	0 days
1947	31.1 °C	38.0 °C	23.4 °C	15 mm	29 days	5 days
1946	30.7 °C	37.1 °C	23.9 °C	20 mm	29 days	2 days
1945	31.3 °C	37.5 °C	24.4 °C	8 mm	29 days	2 days
1944	30.0 °C	36.3 °C	23.5 °C	36 mm	27 days	5 days
1943	31.2 °C	37.7 °C	23.4 °C	9 mm	27 days	1 day
1942	31.0 °C	37.4 °C	23.9 °C	3 mm	30 days	1 day
1941	28.2 °C	34.9 °C	20.7 °C	18 mm	27 days	2 days
1940	30.2 °C	36.2 °C	23.5 °C	4 mm	30 days	2 days

September records

Hottest day

46.3 °C

September 1, 1950 estimate

Nearby station: 47.8 °C on September 1, 1950 measured

Coldest night

12.1 °C

September 21, 1965 estimate

Nearby station: 8.3 °C on September 20, 1965 measured

Wettest day

87 mm

September 5, 1970 estimate

The weather on your birthday in Phoenix

Any day since 1940: high, low, rain, snow, and how warm it was compared with the same date in every other year.

Questions & answers

How warm is Phoenix in September?

Highs average 37.7 °C and lows 24.6 °C. A typical September brings 29 hot days (30 °C or more) and 0 frost days.

Does it rain a lot in Phoenix in September?

About 24 mm falls in September, over some 3 days with at least 1 mm. The wettest September was 1970 (161 mm), the driest 1951 (0 mm).

What was the warmest September in Phoenix?

2024, with a mean temperature of 33.4 °C. The coldest was 1986 (26.8 °C). The last one, 2025, ranks 24 of 86.