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May Weather in Keystone, United States

Last updated: June 24, 2025

In May, the average temperature in Keystone, United States hovers around 16°C (62°F), with a notable range between a chilly -1°C (31°F) and a sweltering 34°C (94°F). Expect 162 mm (6.4 in) of precipitation over approximately 16 days, contributing to an average humidity of 78%. Be prepared for varied weather as you plan your activities!

May Temperature in Keystone

In May in Keystone, the average temperature is 16°C (62°F). Maximum temperatures can reach up to 34°C (94°F), while minimums can drop as low as -1°C (31°F). This variability in weather conditions makes Keystone an ideal destination for travelers seeking a diverse climate experience.

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

The chart illustrates May temperature patterns in Keystone, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keystone, May typically has an average temperature of 16°C (62°F), with highs reaching up to 34°C (94°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec212338486273757267523730
Data source: Temperature data for Keystone 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 Keystone

In Keystone in May, the precipitation amount is 162 mm (6.4 in) spread over 16 days.

May Precipitation Trends in Keystone

The chart displays monthly precipitation patterns in Keystone, 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 Keystone, May typically receives around 162 mm (6.4 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec4552738516214391641211434540
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Keystone

In Keystone in May, humidity is 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.

May Average Humidity in Keystone

This chart illustrates the average monthly humidity levels in Keystone, 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 Keystone is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%81%81%82%78%81%79%77%78%79%87%84%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Keystone

In Keystone in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Keystone.

Maximum UV Index Levels in Keystone for May

The chart shows the monthly maximum UV Index (UVI) for Keystone 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 Keystone typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098633
Data source: Keystone 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 Keystone Compares to Other Months

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

This table compares monthly weather conditions in Keystone, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)45 mm (1.8 inches)81%moderate
February Weather-5°C (23°F)52 mm (2.1 inches)81%moderate
March Weather3°C (38°F)73 mm (2.9 inches)81%high
April Weather9°C (48°F)85 mm (3.3 inches)82%very high
May Weather16°C (62°F)162 mm (6.4 inches)78%very high
June Weather23°C (73°F)143 mm (5.6 inches)81%extreme
July Weather24°C (76°F)91 mm (3.6 inches)79%very high
August Weather22°C (72°F)64 mm (2.5 inches)77%very high
September Weather20°C (67°F)121 mm (4.8 inches)78%very high
October Weather11°C (52°F)143 mm (5.6 inches)78%high
November Weather3°C (38°F)45 mm (1.8 inches)87%moderate
December Weather-1°C (30°F)40 mm (1.6 inches)84%moderate

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