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Sulphur, Louisiana climate

Cfa Humid subtropical

Sulphur has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 93°F, while the coldest is January averaging around 43°F at night. Around 60 inches of precipitation falls each year, peaking in June (6.5 inches) and easing off in February (3.3 inches).

☀️ Summers

Hot

Highs near 93°F in August.

About 88 days a year above 90 °F

❄️ Winters

Cool

Lows near 43°F in January.

About 11 freezing nights a year

🌧️ Rain

Wet

About 60 in of rain a year.

Wettest in June

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+1.6 °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

Sulphur climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	63	67	73	79	85	91	92	93	89	82	72	65
Avg temp (°F)	53	57	63	69	76	82	84	84	80	71	61	55
Avg low (°F)	43	47	53	59	67	74	76	75	71	60	51	45
Precipitation (in)	5.9	3.3	3.7	4.4	5.4	6.5	5.7	6.2	5.2	4.8	4.1	4.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	63	67	73	79	85	91
Avg temp (°F)	53	57	63	69	76	82
Avg low (°F)	43	47	53	59	67	74
Precipitation (in)	5.9	3.3	3.7	4.4	5.4	6.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	92	93	89	82	72	65
Avg temp (°F)	84	84	80	71	61	55
Avg low (°F)	76	75	71	60	51	45
Precipitation (in)	5.7	6.2	5.2	4.8	4.1	4.6

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	9	8	7	8	11	11	11	9	8	8	10
Days with high ≥ 90°F (days)	—	—	0.0	0.1	4	17	24	25	16	2	—	—
Days with low ≤ 32°F (days)	5	2	0.6	—	—	—	—	—	—	0.0	1.0	3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	9	8	7	8	11
Days with high ≥ 90°F (days)	—	—	0.0	0.1	4	17
Days with low ≤ 32°F (days)	5	2	0.6	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	11	9	8	8	10
Days with high ≥ 90°F (days)	24	25	16	2	—	—
Days with low ≤ 32°F (days)	—	—	—	0.0	1.0	3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	62	65	62	59	57	53	52	50	47	43	52	62
Clear days (≤ 30% cloud)	7	6	7	7	7	8	8	9	11	13	9	6
Partly cloudy days (30–70%)	9	7	9	10	11	13	13	15	11	10	11	9
Cloudy days (≥ 70%)	15	15	15	13	12	9	9	8	9	8	11	15
Relative humidity (%)	84	84	83	80	79	77	78	76	77	77	80	84
Wind speed (mph)	8.1	8.2	8.3	8.6	7.8	6.7	5.8	5.5	6.7	7.3	7.7	8.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	62	65	62	59	57	53
Clear days (≤ 30% cloud)	7	6	7	7	7	8
Partly cloudy days (30–70%)	9	7	9	10	11	13
Cloudy days (≥ 70%)	15	15	15	13	12	9
Relative humidity (%)	84	84	83	80	79	77
Wind speed (mph)	8.1	8.2	8.3	8.6	7.8	6.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	52	50	47	43	52	62
Clear days (≤ 30% cloud)	8	9	11	13	9	6
Partly cloudy days (30–70%)	13	15	11	10	11	9
Cloudy days (≥ 70%)	9	8	9	8	11	15
Relative humidity (%)	78	76	77	77	80	84
Wind speed (mph)	5.8	5.5	6.7	7.3	7.7	8.0

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Lake Charles (NOAA GHCN station USW00003937), about 20 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 →