Home › Cities › United States › Arizona › Tempe

Tempe, Arizona climate

BWh Hot desert

Tempe has a seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 41°C, while the coldest is December averaging around 3°C at night. Precipitation totals about 224 mm a year and is strongly seasonal — August alone averages 33 mm while June barely receives 2 mm.

☀️ Summers

Extreme heat

Highs near 41°C in July.

About 165 days a year above 32 °C

❄️ Winters

Chilly

Lows near 3°C in December.

About 9 freezing nights a year

🌧️ Rain

Very dry

About 224 mm of rain a year.

Wettest in August

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+0.2 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Tempe climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	21	23	27	31	35	40	41	40	38	33	26	21
Avg temp (°C)	13	14	17	21	25	30	33	32	29	23	17	12
Avg low (°C)	4	5	8	11	15	19	24	24	21	14	7	3
Precipitation (mm)	26	28	24	6	5	2	25	33	18	15	17	24

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	21	23	27	31	35	40
Avg temp (°C)	13	14	17	21	25	30
Avg low (°C)	4	5	8	11	15	19
Precipitation (mm)	26	28	24	6	5	2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	41	40	38	33	26	21
Avg temp (°C)	33	32	29	23	17	12
Avg low (°C)	24	24	21	14	7	3
Precipitation (mm)	25	33	18	15	17	24

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	4	3	1	1	0.6	4	4	3	2	2	4
Days with high ≥ 32°C (days)	—	0.0	2	10	22	27	29	29	27	17	2	—
Days with low ≤ 0°C (days)	3	2	0.1	0.0	—	—	—	—	—	—	0.5	4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	4	4	3	1	1	0.6
Days with high ≥ 32°C (days)	—	0.0	2	10	22	27
Days with low ≤ 0°C (days)	3	2	0.1	0.0	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	4	3	2	2	4
Days with high ≥ 32°C (days)	29	29	27	17	2	—
Days with low ≤ 0°C (days)	—	—	—	—	0.5	4

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	42	44	38	30	25	20	46	45	29	27	32	42
Clear days (≤ 30% cloud)	14	12	15	18	21	23	10	11	18	20	17	14
Partly cloudy days (30–70%)	9	8	9	8	8	5	14	14	8	6	7	8
Cloudy days (≥ 70%)	8	8	7	4	3	2	8	7	4	5	5	8
Relative humidity (%)	47	45	40	31	23	16	29	35	32	30	35	45
Wind speed (km/h)	6.9	6.9	7.1	8.0	8.0	8.0	7.3	6.4	6.9	7.1	7.1	6.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	42	44	38	30	25	20
Clear days (≤ 30% cloud)	14	12	15	18	21	23
Partly cloudy days (30–70%)	9	8	9	8	8	5
Cloudy days (≥ 70%)	8	8	7	4	3	2
Relative humidity (%)	47	45	40	31	23	16
Wind speed (km/h)	6.9	6.9	7.1	8.0	8.0	8.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	46	45	29	27	32	42
Clear days (≤ 30% cloud)	10	11	18	20	17	14
Partly cloudy days (30–70%)	14	14	8	6	7	8
Cloudy days (≥ 70%)	8	7	4	5	5	8
Relative humidity (%)	29	35	32	30	35	45
Wind speed (km/h)	7.3	6.4	6.9	7.1	7.1	6.7

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Tempe Asu (NOAA GHCN station USC00028499), about 2 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →