May Weather in Saint Helen, United States

Last updated: June 24, 2025

In Saint Helen, United States during May, the average temperature hovers around 13°C (56°F), offering a mild climate. Expect a minimum of -3°C (26°F) on chillier days, while maximum temperatures can reach a warm 34°C (93°F). This month typically sees precipitation of 111 mm (4.4 in) over approximately 12 days, contributing to an average humidity level of 79%. Stay prepared for a blend of comforting warmth and the occasional shower!

May Temperature in Saint Helen

In May in Saint Helen, the average temperature is 13°C (56°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop as low as -3°C (26°F). Be prepared for a wide range of weather conditions when traveling to Saint Helen during this month.

May Weather in Saint Helen: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Saint Helen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Helen, May typically has an average temperature of 13°C (56°F), with highs reaching up to 34°C (93°F) and lows dropping to around -3°C (26°F).

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

May Precipitation in Saint Helen

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

May Precipitation Trends in Saint Helen

The chart displays monthly precipitation patterns in Saint Helen, 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 Saint Helen, May typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Saint Helen

In Saint Helen in May, humidity is 79%. With an average temperature of 13°C (56°F), this humidity feels like a damp, cool blanket wrapping around you, making traveling slightly uncomfortable and requiring you to dress in layers to stay comfortable while exploring.

May Average Humidity in Saint Helen

This chart illustrates the average monthly humidity levels in Saint Helen, 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 Saint Helen is approximately 79%, 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 Saint Helen

In Saint Helen 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 Saint Helen.

Maximum UV Index Levels in Saint Helen for May

The chart shows the monthly maximum UV Index (UVI) for Saint Helen 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 Saint Helen typically reaches 9, which falls under the very high exposure category.

Data source: Saint Helen 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 Saint Helen Compares to Other Months

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

This table compares monthly weather conditions in Saint Helen, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	51 mm (2.0 inches)	92%	low
February Weather	-6°C (22°F)	51 mm (2.0 inches)	91%	moderate
March Weather	0°C (32°F)	54 mm (2.1 inches)	87%	moderate
April Weather	6°C (43°F)	94 mm (3.7 inches)	85%	very high
May Weather	13°C (56°F)	111 mm (4.4 inches)	79%	very high
June Weather	19°C (66°F)	114 mm (4.5 inches)	75%	very high
July Weather	22°C (72°F)	91 mm (3.6 inches)	75%	very high
August Weather	20°C (69°F)	89 mm (3.5 inches)	75%	very high
September Weather	16°C (61°F)	76 mm (3.0 inches)	79%	high
October Weather	10°C (49°F)	124 mm (4.9 inches)	85%	moderate
November Weather	2°C (35°F)	58 mm (2.3 inches)	88%	moderate
December Weather	-2°C (28°F)	62 mm (2.4 inches)	89%	low