May Weather in Grantsville, United States

Last updated: June 24, 2025

In May, the average temperature in Grantsville, United States hovers around 18°C (65°F), offering a mild climate for visitors. However, prepare for a range of temperatures, as it can dip to a chilly 0°C (33°F) and peak at a warm 32°C (89°F). During this month, expect approximately 160 mm (6.3 in) of precipitation spread over 18 days, contributing to an average humidity level of 82%.

May Temperature in Grantsville

In May in Grantsville, the average temperature is 18°C (65°F). Maximums can reach 32°C (89°F), while minimums can dip as low as 0°C (33°F). This climate makes Grantsville an ideal destination for travelers seeking a mix of warm and cool experiences.

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 18°C (65°F), with highs reaching up to 32°C (89°F) and lows dropping to around 0°C (33°F).

Data source: Temperature data for Grantsville generated using information from the Copernicus Climate Change Service.

May Precipitation in Grantsville

In Grantsville in May, the precipitation amount is 160 mm (6.3 in) spread across 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 160 mm (6.3 inches) of precipitation spread over approximately 18 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Grantsville

In Grantsville in May, humidity is 82%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can quickly leave travelers feeling fatigued and in need of frequent breaks to stay refreshed and hydrated.

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 82%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (35°F)	98 mm (3.9 inches)	88%	moderate
February Weather	4°C (40°F)	142 mm (5.6 inches)	88%	moderate
March Weather	8°C (46°F)	115 mm (4.5 inches)	88%	high
April Weather	13°C (55°F)	142 mm (5.6 inches)	86%	very high
May Weather	18°C (65°F)	160 mm (6.3 inches)	82%	very high
June Weather	22°C (72°F)	172 mm (6.8 inches)	84%	very high
July Weather	24°C (76°F)	129 mm (5.1 inches)	82%	very high
August Weather	23°C (74°F)	120 mm (4.7 inches)	73%	very high
September Weather	21°C (70°F)	106 mm (4.2 inches)	73%	very high
October Weather	15°C (60°F)	116 mm (4.6 inches)	81%	high
November Weather	7°C (45°F)	81 mm (3.2 inches)	89%	moderate
December Weather	4°C (40°F)	122 mm (4.8 inches)	86%	moderate