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May Weather in Salem, United States

Last updated: June 24, 2025

In May, the average temperature in Salem, United States is a moderate 19°C (67°F). However, temperatures can swing between a cool 1°C (35°F) and a warm 33°C (92°F). Expect 137 mm (5.4 in) of precipitation over 11 days, and don’t forget the humidity—averaging a sticky 83%!

May Temperature in Salem

In May in Salem, the average temperature is 19°C (67°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 1°C (35°F). This wide temperature range suggests that travelers should be prepared for both warm and cool weather 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 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec414651586773777671624844
Data source: Temperature data for Salem 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 Salem

In Salem in May, the total precipitation amount reaches 137 mm (5.4 in) over a span of 11 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 137 mm (5.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9712010013713781669512815184116
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Salem

In Salem in May humidity is 83%. With an average temperature of 19°C (67°F), this humidity feels like a warm, tropical blanket wrapping around you, making traveling feel a bit sluggish and sticky, yet still inviting as long as you stay hydrated and take breaks in the shade.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109853
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.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)97 mm (3.8 inches)86%moderate
February Weather8°C (46°F)120 mm (4.7 inches)85%high
March Weather10°C (51°F)100 mm (3.9 inches)84%very high
April Weather15°C (59°F)137 mm (5.4 inches)82%very high
May Weather19°C (67°F)137 mm (5.4 inches)83%very high
June Weather23°C (73°F)81 mm (3.2 inches)82%extreme
July Weather25°C (78°F)66 mm (2.6 inches)80%extreme
August Weather24°C (76°F)95 mm (3.7 inches)74%very high
September Weather22°C (72°F)128 mm (5.0 inches)75%very high
October Weather17°C (62°F)151 mm (5.9 inches)79%very high
November Weather9°C (49°F)84 mm (3.3 inches)87%moderate
December Weather7°C (44°F)116 mm (4.6 inches)87%moderate

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