McAllen, TX Climate & Monthly Averages
The climate of McAllen
McAllen is a humid subtropical city - hot, humid summers and generally mild winters. August is the warmest month at 98°F (36°C) and January the coolest at 71°F (22°C), over 27.7 inches (703 mm) of precipitation a year.
Climate quick facts
- Hottest month: August - highs near 98°F (36°C)
- Coldest month: January - highs near 71°F (22°C)
- Decade extremes (2015-2024): 108°F (42°C) high · 23°F (-5°C) low
- Wettest month: September (12 rainy days) · Sunniest: August (12.2 h sun/day)
- Climate type: humid subtropical
- Annual swing: 14°C between the average warmest and coolest month · day to night: 10°C
- Months averaging 30°C or hotter: 7
- Average humidity: 69%
Temperatures through the year
Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is November through February. August is the warm end of the year, averaging 98°F (36°C) by day and 80°F (26°C) overnight. January bottoms out at 71°F (22°C) in daylight, 53°F (12°C) after dark. The gridded 2015-2024 daily record for this location tops out at 108°F (42°C) and bottoms at 23°F (-5°C) - decade extremes, not all-time station records. The wettest month is September (3.6 inches (92 mm) across 12 days) and the driest February.
Rain, sun and snow
Average highs hold at or above 30°C for 7 months of the year, April through October being the unbroken run.
How McAllen compares
- McAllen sits close to the middle of our dataset on most measures: 76°F (24°C) as an annual average, 27.7 inches (703 mm) of precipitation and 9.7 hours of sun a day.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 71° | 53° | 6 | 1.3 in | 7.4 h/day | 68% |
| February | 76° | 57° | 5 | 1.0 in | 8.2 h/day | 69% |
| March | 82° | 64° | 6 | 1.9 in | 8.5 h/day | 69% |
| April | 87° | 69° | 8 | 2.4 in | 9.7 h/day | 69% |
| May | 91° | 74° | 10 | 3.3 in | 11.2 h/day | 72% |
| June | 94° | 77° | 10 | 3.4 in | 12.0 h/day | 70% |
| July | 96° | 79° | 7 | 3.3 in | 12.1 h/day | 67% |
| August | 98° | 80° | 8 | 1.7 in | 12.2 h/day | 65% |
| September | 92° | 76° | 12 | 3.6 in | 10.4 h/day | 71% |
| October | 88° | 70° | 8 | 2.5 in | 9.7 h/day | 68% |
| November | 79° | 62° | 8 | 2.2 in | 7.9 h/day | 71% |
| December | 75° | 57° | 5 | 1.1 in | 7.5 h/day | 71% |
McAllen month by month
McAllen weather in January
January brings highs around 71°F (22°C), lows near 53°F (12°C), about 6 wet days - typically the coldest month of the year in McAllen.
McAllen weather in February
February brings highs around 76°F (24°C), lows near 57°F (14°C), about 5 wet days - typically the driest month of the year in McAllen.
McAllen weather in March
March brings highs around 82°F (28°C), lows near 64°F (18°C), about 6 wet days.
McAllen weather in April
April brings highs around 87°F (31°C), lows near 69°F (20°C), about 8 wet days.
McAllen weather in May
May brings highs around 91°F (33°C), lows near 74°F (24°C), about 10 wet days.
McAllen weather in June
June brings highs around 94°F (35°C), lows near 77°F (25°C), about 10 wet days.
McAllen weather in July
July brings highs around 96°F (36°C), lows near 79°F (26°C), about 7 wet days.
McAllen weather in August
August brings highs around 98°F (36°C), lows near 80°F (26°C), about 8 wet days - typically the hottest month and the sunniest month of the year in McAllen.
McAllen weather in September
September brings highs around 92°F (34°C), lows near 76°F (25°C), about 12 wet days - typically the wettest month of the year in McAllen.
McAllen weather in October
October brings highs around 88°F (31°C), lows near 70°F (21°C), about 8 wet days.
McAllen weather in November
November brings highs around 79°F (26°C), lows near 62°F (17°C), about 8 wet days.
McAllen weather in December
December brings highs around 75°F (24°C), lows near 57°F (14°C), about 5 wet days.
Seasons in McAllen
Spring (March through May)
Spring is hot here - highs near 87°F (30°C), nights near 69°F (21°C), and expect showers on roughly 24 days across the season. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
Summer (June through August)
Summer in McAllen is punishingly hot, with daytime highs averaging 96°F (36°C) and nights around 79°F (26°C); expect showers on roughly 24 days across the season. Daylight is generous - around 12.1 hours of sun a day.
Fall (September through November)
Fall runs hot here - highs near 86°F (30°C), nights near 70°F (21°C), and expect showers on roughly 28 days across the season.
Winter (December through February)
Through winter, McAllen brings comfortable warmth: 74°F (23°C) by day, 56°F (13°C) after dark, and rain comes on about 17 days over the three months.
Climate questions, answered
What should I wear in McAllen?
How many rainy days does McAllen get in a year?
Is McAllen cold in winter?
How sunny is McAllen?
Best time to visit McAllen
Aim for December to March if you get the choice: warm days, manageable rainfall and plenty of daylight line up, and highs average 76°F (24°C) against roughly 6 wet days a month. For the same question asked the other way round, see where else is warm in December.
Pack for McAllen with lightweight, breathable clothing and serious sun protection and a compact umbrella or rain shell. August nights average 80°F (26°C), so evenings rarely match the afternoons.
McAllen temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.