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May Weather in Grand Junction, United States

Last updated: June 24, 2025

In May, the average temperature in Grand Junction, United States hovers around 17°C (62°F). During this month, temperatures can range from a cool 1°C (34°F) to a sweltering 36°C (98°F). Expect a significant precipitation amount of 163 mm (6.4 in) spread over 15 days, coupled with an average humidity level of 77%. Stay prepared for a blend of warm and wet weather!

May Temperature in Grand Junction

In May in Grand Junction, the average temperature is 17°C (62°F). Maximums can reach 36°C (98°F), while minimums can drop as low as 1°C (34°F). Be sure to pack layers to stay comfortable in the diverse weather conditions!

May Weather in Grand Junction: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Grand Junction, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Junction, May typically has an average temperature of 17°C (62°F), with highs reaching up to 36°C (98°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec222339496274777368523830
Data source: Temperature data for Grand Junction 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 Grand Junction

In Grand Junction in May, the total precipitation amount is 163 mm (6.4 in) spread over 15 days.

May Precipitation Trends in Grand Junction

The chart displays monthly precipitation patterns in Grand Junction, 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 Grand Junction, May typically receives around 163 mm (6.4 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec3239766616310184901081233637
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Grand Junction

In Grand Junction in May humidity is 77%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, creating a lush, almost tropical atmosphere that can be quite stifling for traveling, making it essential to stay hydrated and take frequent breaks in the shade.

May Average Humidity in Grand Junction

This chart illustrates the average monthly humidity levels in Grand Junction, 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 Grand Junction is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Grand Junction

In Grand Junction 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 Grand Junction.

Maximum UV Index Levels in Grand Junction for May

The chart shows the monthly maximum UV Index (UVI) for Grand Junction 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 Grand Junction typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35589111098643
Data source: Grand Junction 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 Grand Junction Compares to Other Months

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

This table compares monthly weather conditions in Grand Junction, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)32 mm (1.3 inches)78%moderate
February Weather-5°C (23°F)39 mm (1.5 inches)80%moderate
March Weather4°C (39°F)76 mm (3.0 inches)77%moderate
April Weather9°C (49°F)66 mm (2.6 inches)77%very high
May Weather17°C (62°F)163 mm (6.4 inches)77%very high
June Weather23°C (74°F)101 mm (4.0 inches)81%extreme
July Weather25°C (77°F)84 mm (3.3 inches)81%very high
August Weather23°C (74°F)90 mm (3.5 inches)77%very high
September Weather20°C (68°F)108 mm (4.2 inches)73%very high
October Weather11°C (52°F)122 mm (4.8 inches)75%high
November Weather3°C (38°F)36 mm (1.4 inches)85%moderate
December Weather-1°C (30°F)37 mm (1.4 inches)83%moderate

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