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May Weather in McAllen, United States

Last updated: June 24, 2025

In May, the average temperature in McAllen, United States hovers around 28°C (83°F), with a minimum dipping to 15°C (59°F) and a maximum peaking at 40°C (105°F). Expect some moisture, as the region receives about 87 mm (3.4 in) of precipitation over the course of 7 days. With an average humidity of 80%, you'll definitely feel the tropical vibes! 🌴

May Temperature in McAllen

In May in McAllen, the average temperature is 28°C (83°F). Maximums can reach 40°C (105°F), while minimums can be as low as 15°C (59°F). Travelers should be prepared for warm weather and varying temperatures throughout the day.

May Weather in McAllen: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in McAllen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In McAllen, May typically has an average temperature of 28°C (83°F), with highs reaching up to 40°C (105°F) and lows dropping to around 15°C (59°F).
JanFebMarAprMayJunJulAugSepOctNovDec616572778285868884776964
Data source: Temperature data for McAllen generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in McAllen

In McAllen in May, the precipitation amount is 87 mm (3.4 in) over a span of 7 days.

May Precipitation Trends in McAllen

The chart displays monthly precipitation patterns in McAllen, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In McAllen, May typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec2021313187811002296513021
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in McAllen

In McAllen in May, humidity is 80%. With an average temperature of 28°C (83°F), this humidity feels like a thick blanket enveloping you, making travel feel sluggish and sticky, as every movement generates a sheen of perspiration that clings to your skin.

May Average Humidity in McAllen

This chart illustrates the average monthly humidity levels in McAllen, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in McAllen is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in McAllen

In McAllen in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in McAllen.

Maximum UV Index Levels in McAllen for May

The chart shows the monthly maximum UV Index (UVI) for McAllen in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in McAllen typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6910111212121211976
Data source: McAllen May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in McAllen Compares to Other Months

Weather in McAllen varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in McAllen, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in McAllen, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (62°F)20 mm (0.8 inches)83%high
February Weather18°C (65°F)21 mm (0.8 inches)79%very high
March Weather22°C (72°F)31 mm (1.2 inches)76%very high
April Weather25°C (78°F)31 mm (1.2 inches)77%extreme
May Weather28°C (83°F)87 mm (3.4 inches)80%extreme
June Weather30°C (86°F)81 mm (3.2 inches)73%extreme
July Weather30°C (87°F)100 mm (3.9 inches)66%extreme
August Weather31°C (88°F)22 mm (0.9 inches)65%extreme
September Weather29°C (84°F)96 mm (3.8 inches)73%extreme
October Weather25°C (77°F)51 mm (2.0 inches)76%very high
November Weather20°C (69°F)30 mm (1.2 inches)80%high
December Weather18°C (64°F)21 mm (0.8 inches)86%high

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