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May Weather in Salem, United States

Last updated: June 24, 2025

In Salem, United States, the average temperature in May is a pleasant 20°C (68°F). However, temperatures can fluctuate, with a minimum of 3°C (37°F) and a maximum reaching up to 32°C (90°F). Expect 142 mm (5.6 in) of precipitation spread over 13 days, contributing to an average humidity level of 82%.

May Temperature in Salem

In May in Salem, the average temperature is 20°C (68°F). The maximum can reach 32°C (90°F), and the minimum can be as low as 3°C (37°F). Be prepared for a mix of warm days and chilly nights when traveling to Salem in May.

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 20°C (68°F), with highs reaching up to 32°C (90°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec394350576874797772624844
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 precipitation amount is 142 mm (5.6 in) spread over 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 142 mm (5.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec10219214914714216211912012412284145
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 82%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit sluggish but surprisingly refreshing, as long as you take breaks in shaded areas to cool off.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109753
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 Weather4°C (39°F)102 mm (4.0 inches)87%moderate
February Weather6°C (44°F)192 mm (7.6 inches)86%high
March Weather10°C (50°F)149 mm (5.9 inches)86%high
April Weather14°C (57°F)147 mm (5.8 inches)82%very high
May Weather20°C (68°F)142 mm (5.6 inches)82%very high
June Weather24°C (75°F)162 mm (6.4 inches)83%extreme
July Weather26°C (79°F)119 mm (4.7 inches)80%extreme
August Weather25°C (77°F)120 mm (4.7 inches)74%very high
September Weather22°C (73°F)124 mm (4.9 inches)71%very high
October Weather17°C (63°F)122 mm (4.8 inches)78%high
November Weather9°C (48°F)84 mm (3.3 inches)88%moderate
December Weather7°C (44°F)145 mm (5.7 inches)88%moderate

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