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 | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 71° | 53° | 6 | 1.3 in | 7.4 h/day | 10.7 h | 21% | 68% |
| February | 76° | 57° | 5 | 1.0 in | 8.2 h/day | 11.2 h | 19% | 69% |
| March | 82° | 64° | 6 | 1.9 in | 8.5 h/day | 11.9 h | 20% | 69% |
| April | 87° | 69° | 8 | 2.4 in | 9.7 h/day | 12.7 h | 27% | 69% |
| May | 91° | 74° | 10 | 3.3 in | 11.2 h/day | 13.4 h | 32% | 72% |
| June | 94° | 77° | 10 | 3.4 in | 12.0 h/day | 13.8 h | 32% | 70% |
| July | 96° | 79° | 7 | 3.3 in | 12.1 h/day | 13.6 h | 22% | 67% |
| August | 98° | 80° | 8 | 1.7 in | 12.2 h/day | 13.1 h | 25% | 65% |
| September | 92° | 76° | 12 | 3.6 in | 10.4 h/day | 12.3 h | 39% | 71% |
| October | 88° | 70° | 8 | 2.5 in | 9.7 h/day | 11.5 h | 26% | 68% |
| November | 79° | 62° | 8 | 2.2 in | 7.9 h/day | 10.8 h | 27% | 71% |
| December | 75° | 57° | 5 | 1.1 in | 7.5 h/day | 10.5 h | 15% | 71% |
McAllen month by month
Average high and low for each month, with the bar showing where it sits in McAllen's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 6 days
- Sunshine
- 7.4 h
- Daylight
- 10.7 h
February
- Rain
- 5 days
- Sunshine
- 8.2 h
- Daylight
- 11.2 h
March
- Rain
- 6 days
- Sunshine
- 8.5 h
- Daylight
- 11.9 h
April
- Rain
- 8 days
- Sunshine
- 9.7 h
- Daylight
- 12.7 h
May
- Rain
- 10 days
- Sunshine
- 11.2 h
- Daylight
- 13.4 h
June
- Rain
- 10 days
- Sunshine
- 12.0 h
- Daylight
- 13.8 h
July
- Rain
- 7 days
- Sunshine
- 12.1 h
- Daylight
- 13.6 h
August
- Rain
- 8 days
- Sunshine
- 12.2 h
- Daylight
- 13.1 h
September
- Rain
- 12 days
- Sunshine
- 10.4 h
- Daylight
- 12.3 h
October
- Rain
- 8 days
- Sunshine
- 9.7 h
- Daylight
- 11.5 h
November
- Rain
- 8 days
- Sunshine
- 7.9 h
- Daylight
- 10.8 h
December
- Rain
- 5 days
- Sunshine
- 7.5 h
- Daylight
- 10.5 h
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
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. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.