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Weslaco, Texas climate

Cfa Humid subtropical

Weslaco has a seasonal tropical climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 98°F, while the coldest is January averaging around 51°F at night. Precipitation totals about 28 inches a year and is strongly seasonal — September alone averages 5.8 inches while February barely receives 1.19 inches.

☀️ Summers

Very hot

Highs near 98°F in August.

About 138 days a year above 90 °F

❄️ Winters

Mild

Lows near 51°F in January.

About 1 freezing nights a year

🌧️ Rain

Moderate rainfall

About 28 in of rain a year.

Wettest in September

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+2.5 °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

Weslaco climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	72	76	81	86	91	95	97	98	93	88	80	73
Avg temp (°F)	61	65	71	76	82	86	87	87	83	77	69	63
Avg low (°F)	51	55	60	66	72	76	77	77	74	67	59	53
Precipitation (in)	1.2	1.2	1.5	2.3	2.7	2.4	2.4	2.1	5.8	3.1	2.0	1.6
Snowfall (in)	—	—	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	72	76	81	86	91	95
Avg temp (°F)	61	65	71	76	82	86
Avg low (°F)	51	55	60	66	72	76
Precipitation (in)	1.2	1.2	1.5	2.3	2.7	2.4
Snowfall (in)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	97	98	93	88	80	73
Avg temp (°F)	87	87	83	77	69	63
Avg low (°F)	77	77	74	67	59	53
Precipitation (in)	2.4	2.1	5.8	3.1	2.0	1.6
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)	7	5	6	4	5	6	5	6	10	6	6	7
Days with high ≥ 90°F (days)	0.1	0.6	2	7	17	24	27	28	21	10	0.9	—
Days with low ≤ 32°F (days)	0.5	0.4	—	—	0.0	—	—	—	—	—	—	0.3
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	—	—	—	—	—	—	0.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	7	5	6	4	5	6
Days with high ≥ 90°F (days)	0.1	0.6	2	7	17	24
Days with low ≤ 32°F (days)	0.5	0.4	—	—	0.0	—
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	5	6	10	6	6	7
Days with high ≥ 90°F (days)	27	28	21	10	0.9	—
Days with low ≤ 32°F (days)	—	—	—	—	—	0.3
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	0.0

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	67	65	62	59	52	41	38	38	50	45	55	67
Clear days (≤ 30% cloud)	4	5	6	5	8	13	16	15	10	13	8	4
Partly cloudy days (30–70%)	11	9	11	13	13	11	10	11	11	11	11	11
Cloudy days (≥ 70%)	16	15	14	12	9	5	6	5	9	7	11	16
Relative humidity (%)	75	74	72	71	72	70	71	70	74	73	73	75
Wind speed (mph)	8.4	8.9	9.2	9.3	9.0	8.3	8.3	7.2	6.4	7.3	7.7	8.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	67	65	62	59	52	41
Clear days (≤ 30% cloud)	4	5	6	5	8	13
Partly cloudy days (30–70%)	11	9	11	13	13	11
Cloudy days (≥ 70%)	16	15	14	12	9	5
Relative humidity (%)	75	74	72	71	72	70
Wind speed (mph)	8.4	8.9	9.2	9.3	9.0	8.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	38	38	50	45	55	67
Clear days (≤ 30% cloud)	16	15	10	13	8	4
Partly cloudy days (30–70%)	10	11	11	11	11	11
Cloudy days (≥ 70%)	6	5	9	7	11	16
Relative humidity (%)	71	70	74	73	73	75
Wind speed (mph)	8.3	7.2	6.4	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 Harlingen (NOAA GHCN station USC00413943), about 32 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 →