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Port Arthur, Texas climate

Cfa Humid subtropical

Port Arthur 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 65 inches of precipitation falls each year, peaking in September (7.4 inches) and easing off in February (3.7 inches).

☀️ Summers

Hot

Highs near 93°F in August.

About 54 days a year above 90 °F

❄️ Winters

Cool

Lows near 43°F in January.

About 5 freezing nights a year

🌧️ Rain

Very wet

About 65 in of rain a year.

Wettest in September

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+2.8 °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

Port Arthur climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	63	66	72	78	85	90	92	93	89	82	71	64
Avg temp (°F)	53	57	63	69	77	82	84	84	79	71	61	55
Avg low (°F)	43	47	54	59	68	74	76	75	70	61	51	45
Precipitation (in)	5.4	3.7	3.7	3.9	5.2	7.0	6.5	7.2	7.4	5.4	4.4	5.3
Snowfall (in)	—	—	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	63	66	72	78	85	90
Avg temp (°F)	53	57	63	69	77	82
Avg low (°F)	43	47	54	59	68	74
Precipitation (in)	5.4	3.7	3.7	3.9	5.2	7.0
Snowfall (in)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	92	93	89	82	71	64
Avg temp (°F)	84	84	79	71	61	55
Avg low (°F)	76	75	70	61	51	45
Precipitation (in)	6.5	7.2	7.4	5.4	4.4	5.3
Snowfall (in)	—	—	—	—	—	0.1

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	9	8	7	7	11	12	10	9	7	8	10
Days with high ≥ 90°F (days)	—	—	—	0.1	3	12	14	14	9	2	—	—
Days with low ≤ 32°F (days)	2	0.8	0.2	—	—	—	—	—	—	—	0.2	2
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	9	8	7	7	11
Days with high ≥ 90°F (days)	—	—	—	0.1	3	12
Days with low ≤ 32°F (days)	2	0.8	0.2	—	—	—
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	12	10	9	7	8	10
Days with high ≥ 90°F (days)	14	14	9	2	—	—
Days with low ≤ 32°F (days)	—	—	—	—	0.2	2
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	62	66	62	59	59	52	49	47	46	44	53	62
Clear days (≤ 30% cloud)	7	6	7	7	6	8	10	10	11	13	9	6
Partly cloudy days (30–70%)	9	7	8	10	11	13	13	14	11	9	10	9
Cloudy days (≥ 70%)	15	16	16	14	13	9	8	7	8	8	11	15
Relative humidity (%)	84	85	82	79	77	76	76	74	76	77	81	84
Wind speed (mph)	3.9	3.9	4.0	4.2	3.9	3.4	3.0	2.8	3.2	3.5	3.7	3.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	62	66	62	59	59	52
Clear days (≤ 30% cloud)	7	6	7	7	6	8
Partly cloudy days (30–70%)	9	7	8	10	11	13
Cloudy days (≥ 70%)	15	16	16	14	13	9
Relative humidity (%)	84	85	82	79	77	76
Wind speed (mph)	3.9	3.9	4.0	4.2	3.9	3.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	49	47	46	44	53	62
Clear days (≤ 30% cloud)	10	10	11	13	9	6
Partly cloudy days (30–70%)	13	14	11	9	10	9
Cloudy days (≥ 70%)	8	7	8	8	11	15
Relative humidity (%)	76	74	76	77	81	84
Wind speed (mph)	3.0	2.8	3.2	3.5	3.7	3.9

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Beaumont City (NOAA GHCN station USC00410611), about 28 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 →