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May Weather in Plains, United States

Last updated: June 24, 2025

In May, the average temperature in Plains, United States is a comfortable 18°C (65°F), but it can swing dramatically with a minimum of 0°C (32°F) and a maximum reaching up to 38°C (100°F). Visitors should be prepared for a wet experience, as precipitation averages around 111 mm (4.4 in) over the course of 12 days. Additionally, humidity levels are relatively high, averaging at 81%, contributing to a tropical feel during this month.

May Temperature in Plains

In May in Plains, the average temperature is 18°C (65°F). Maximums can reach up to 38°C (100°F), while minimums can drop as low as 0°C (32°F). This climate offers a diverse range of experiences for travelers, so be sure to pack accordingly!

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

The chart illustrates May temperature patterns in Plains, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plains, May typically has an average temperature of 18°C (65°F), with highs reaching up to 38°C (100°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec343548556576807873574638
Data source: Temperature data for Plains 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 Plains

In Plains, in May, the precipitation amount is 111 mm (4.4 in) over a span of 12 days.

May Precipitation Trends in Plains

The chart displays monthly precipitation patterns in Plains, 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 Plains, May typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1913634411153435337571026
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Plains

In Plains in May, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

May Average Humidity in Plains

This chart illustrates the average monthly humidity levels in Plains, 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 Plains is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%77%65%67%81%82%82%84%79%75%79%83%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Plains

In Plains in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Plains.

Maximum UV Index Levels in Plains for May

The chart shows the monthly maximum UV Index (UVI) for Plains 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 Plains typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111211119753
Data source: Plains 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 Plains Compares to Other Months

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

This table compares monthly weather conditions in Plains, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)19 mm (0.8 inches)74%moderate
February Weather2°C (35°F)13 mm (0.5 inches)77%high
March Weather9°C (48°F)63 mm (2.5 inches)65%high
April Weather13°C (55°F)43 mm (1.7 inches)67%very high
May Weather18°C (65°F)111 mm (4.4 inches)81%extreme
June Weather25°C (77°F)53 mm (2.1 inches)82%extreme
July Weather27°C (80°F)43 mm (1.7 inches)82%extreme
August Weather25°C (78°F)53 mm (2.1 inches)84%extreme
September Weather23°C (73°F)37 mm (1.5 inches)79%very high
October Weather14°C (57°F)57 mm (2.2 inches)75%high
November Weather8°C (46°F)10 mm (0.4 inches)79%moderate
December Weather3°C (38°F)26 mm (1.0 inches)83%moderate

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