May Weather in Salem, United States

Last updated: June 24, 2025

In Salem, United States, the month of May brings an average temperature of 15°C (59°F). Throughout this time, temperatures may dip to a chilly 0°C (32°F) or soar to a warm 34°C (93°F). Expect precipitation of approximately 104 mm (4.1 in) over 13 days, contributing to an average humidity level of 74%. Enjoy the varied climate as you explore!

May Temperature in Salem

In May in Salem, the average temperature is 15°C (59°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop to as low as 0°C (32°F). Travelers should be prepared for a wide range of temperatures during their visit.

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

The chart illustrates May temperature patterns in Salem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Salem, May typically has an average temperature of 15°C (59°F), with highs reaching up to 34°C (93°F) and lows dropping to around 0°C (32°F).

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

May Precipitation in Salem

In Salem in May, the precipitation amount is 104 mm (4.1 in) over the course of 13 days.

May Precipitation Trends in Salem

The chart displays monthly precipitation patterns in Salem, 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 Salem, May typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 13 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 Salem

In Salem in May, humidity is 74%. With an average temperature of 15°C (59°F), this humidity feels like traveling through a warm, sticky blanket that clings to your skin, making outdoor activities a bit uncomfortable and prompting you to seek out shaded areas or cool breezes.

May Average Humidity in Salem

This chart illustrates the average monthly humidity levels in Salem, 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 Salem is approximately 74%, 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 Salem

In Salem 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 Salem.

Maximum UV Index Levels in Salem for May

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

Data source: Salem 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 Salem Compares to Other Months

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

This table compares monthly weather conditions in Salem, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	18 mm (0.7 inches)	77%	low
February Weather	-7°C (19°F)	20 mm (0.8 inches)	81%	moderate
March Weather	1°C (35°F)	60 mm (2.4 inches)	71%	moderate
April Weather	7°C (44°F)	76 mm (3.0 inches)	75%	very high
May Weather	15°C (59°F)	104 mm (4.1 inches)	74%	very high
June Weather	23°C (73°F)	75 mm (2.9 inches)	82%	extreme
July Weather	24°C (76°F)	85 mm (3.4 inches)	84%	very high
August Weather	22°C (72°F)	90 mm (3.6 inches)	82%	very high
September Weather	18°C (65°F)	86 mm (3.4 inches)	75%	very high
October Weather	9°C (48°F)	77 mm (3.0 inches)	72%	moderate
November Weather	1°C (35°F)	23 mm (0.9 inches)	81%	moderate
December Weather	-4°C (26°F)	35 mm (1.4 inches)	79%	low