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May Weather in Grantsville, United States

Last updated: June 24, 2025

In May, the average temperature in Grantsville, United States hovers around 15°C (59°F), with a minimum drop to -4°C (25°F) and soaring to a maximum of 28°C (83°F). Expect about 155 mm (6.1 in) of precipitation spread across 18 days, contributing to an average humidity of 78%. Prepare for a blend of warm and cool days in this vibrant destination!

May Temperature in Grantsville

In May in Grantsville, the average temperature is 15°C (59°F), with maximums reaching up to 28°C (83°F) and minimums dropping as low as -4°C (25°F). Pack appropriately to enjoy the varied weather conditions while exploring the beauty of Grantsville.

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

The chart illustrates May temperature patterns in Grantsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grantsville, May typically has an average temperature of 15°C (59°F), with highs reaching up to 28°C (83°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec283339495966716964543934
Data source: Temperature data for Grantsville 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 Grantsville

In Grantsville in May, the total precipitation amount is 155 mm (6.1 in) spread over 18 days.

May Precipitation Trends in Grantsville

The chart displays monthly precipitation patterns in Grantsville, 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 Grantsville, May typically receives around 155 mm (6.1 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec881321151371551501059911911585121
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Grantsville

In Grantsville in May, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

May Average Humidity in Grantsville

This chart illustrates the average monthly humidity levels in Grantsville, 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 Grantsville is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Grantsville

In Grantsville in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Grantsville.

Maximum UV Index Levels in Grantsville for May

The chart shows the monthly maximum UV Index (UVI) for Grantsville 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 Grantsville typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35710101010108753
Data source: Grantsville 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 Grantsville Compares to Other Months

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

This table compares monthly weather conditions in Grantsville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)88 mm (3.5 inches)86%moderate
February Weather1°C (33°F)132 mm (5.2 inches)86%moderate
March Weather4°C (39°F)115 mm (4.5 inches)86%high
April Weather9°C (49°F)137 mm (5.4 inches)84%very high
May Weather15°C (59°F)155 mm (6.1 inches)78%very high
June Weather19°C (67°F)150 mm (5.9 inches)79%very high
July Weather22°C (71°F)105 mm (4.1 inches)70%very high
August Weather21°C (70°F)99 mm (3.9 inches)59%very high
September Weather18°C (64°F)119 mm (4.7 inches)68%very high
October Weather12°C (54°F)115 mm (4.5 inches)80%high
November Weather4°C (40°F)85 mm (3.3 inches)86%moderate
December Weather1°C (34°F)121 mm (4.8 inches)85%moderate

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