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Summerlin South, Nevada climate

BWh Hot desert

Summerlin South has a strongly seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 106°F, while the coldest is December averaging around 37°F at night. Precipitation totals about 5 inches a year and is strongly seasonal — February alone averages 0.9 inches while May barely receives 0.07 inches.

☀️ Summers

Extreme heat

Highs near 106°F in July.

About 133 days a year above 90 °F

❄️ Winters

Chilly

Lows near 37°F in December.

About 18 freezing nights a year

🌧️ Rain

Very dry

About 5 in of rain a year.

Wettest in February

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+2.1 °F 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

Summerlin South climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	59	64	72	80	90	101	106	104	96	82	67	57
Avg temp (°F)	48	53	60	67	76	87	93	91	83	69	56	47
Avg low (°F)	38	41	48	54	63	73	80	78	69	57	44	37
Precipitation (in)	0.6	0.9	0.5	0.3	0.1	0.1	0.4	0.4	0.4	0.4	0.3	0.5
Snowfall (in)	—	—	—	—	—	—	—	—	—	—	—	0.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	59	64	72	80	90	101
Avg temp (°F)	48	53	60	67	76	87
Avg low (°F)	38	41	48	54	63	73
Precipitation (in)	0.6	0.9	0.5	0.3	0.1	0.1
Snowfall (in)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	106	104	96	82	67	57
Avg temp (°F)	93	91	83	69	56	47
Avg low (°F)	80	78	69	57	44	37
Precipitation (in)	0.4	0.4	0.4	0.4	0.3	0.5
Snowfall (in)	—	—	—	—	—	0.2

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	4	3	2	0.9	0.5	3	3	2	2	2	3
Days with high ≥ 90°F (days)	—	—	0.4	4	16	26	29	29	24	5	—	—
Days with low ≤ 32°F (days)	6	3	0.2	—	—	—	—	—	—	0.0	1	8
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	3	4	3	2	0.9	0.5
Days with high ≥ 90°F (days)	—	—	0.4	4	16	26
Days with low ≤ 32°F (days)	6	3	0.2	—	—	—
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	3	2	2	2	3
Days with high ≥ 90°F (days)	29	29	24	5	—	—
Days with low ≤ 32°F (days)	—	—	—	0.0	1	8
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	48	49	46	41	38	27	36	33	25	31	38	47
Clear days (≤ 30% cloud)	11	10	12	13	15	20	16	18	21	19	15	12
Partly cloudy days (30–70%)	11	10	12	10	11	7	10	10	7	7	10	11
Cloudy days (≥ 70%)	9	8	8	6	5	3	5	4	2	5	6	8
Relative humidity (%)	48	45	39	30	24	16	21	24	24	28	36	45
Wind speed (mph)	5.3	5.5	6.0	6.8	6.7	6.9	5.9	5.5	5.3	5.4	5.2	5.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	48	49	46	41	38	27
Clear days (≤ 30% cloud)	11	10	12	13	15	20
Partly cloudy days (30–70%)	11	10	12	10	11	7
Cloudy days (≥ 70%)	9	8	8	6	5	3
Relative humidity (%)	48	45	39	30	24	16
Wind speed (mph)	5.3	5.5	6.0	6.8	6.7	6.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	36	33	25	31	38	47
Clear days (≤ 30% cloud)	16	18	21	19	15	12
Partly cloudy days (30–70%)	10	10	7	7	10	11
Cloudy days (≥ 70%)	5	4	2	5	6	8
Relative humidity (%)	21	24	24	28	36	45
Wind speed (mph)	5.9	5.5	5.3	5.4	5.2	5.3

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Las Vegas Wfo (NOAA GHCN station USC00264439), about 15 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 →