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Weather by month

McAllen Weather by Month

Average temperatures, rainfall and humidity for McAllen, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical McAllen month looks like before you travel — then check the live McAllen forecast for the days ahead.

Warmest month

August

37°C average high

Coolest month

January

11°C average low

Wettest month

September

86 mm of rain

Driest month

February

19 mm of rain

Average temperature and rainfall in McAllen by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

Month	Avg high	Avg low	Record low / high	Rainfall	Humidity	Wind
January	22°C	11°C	-3°C / 34°C	29 mm	69%	15 km/h
February	25°C	14°C	-5°C / 37°C	19 mm	69%	17 km/h
March	28°C	17°C	2°C / 39°C	36 mm	68%	18 km/h
April	31°C	20°C	9°C / 41°C	30 mm	70%	19 km/h
May	33°C	23°C	10°C / 44°C	56 mm	71%	19 km/h
June	35°C	25°C	20°C / 42°C	42 mm	69%	17 km/h
July	36°C	26°C	21°C / 42°C	26 mm	67%	18 km/h
August	37°C	26°C	20°C / 41°C	21 mm	65%	17 km/h
September	34°C	24°C	14°C / 40°C	86 mm	72%	13 km/h
October	31°C	20°C	5°C / 39°C	39 mm	69%	14 km/h
November	27°C	16°C	0°C / 35°C	42 mm	72%	14 km/h
December	24°C	14°C	-1°C / 34°C	34 mm	72%	14 km/h

Best time to visit McAllen

The most comfortable time to visit McAllen is generally December to February, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around September, totalling about 460 mm a year.

Travellers who prefer heat should aim for August, when highs average 37°C. September is the month to avoid if rain would spoil your plans — it averages 86 mm, roughly 4× the rainfall of the driest month (February).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the McAllen forecast for what is happening now.