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May Weather in Lewiston, United States

Last updated: June 24, 2025

In Lewiston, United States, the average temperature in May hovers around 11°C (53°F), with a minimum of 1°C (33°F) and a maximum reaching up to 23°C (74°F). Expect 99 mm (3.9 in) of precipitation spread over approximately 13 days, accompanied by an average humidity of 82%. Enjoy the unique climate as you explore this vibrant locale!

May Temperature in Lewiston

In May in Lewiston, the average temperature is 11°C (53°F), with maximums reaching 23°C (74°F) and minimums dropping to as low as 1°C (33°F). This pleasant yet variable climate makes it an ideal time for exploring the area while being prepared for both warm afternoons and cool evenings.

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

The chart illustrates May temperature patterns in Lewiston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lewiston, May typically has an average temperature of 11°C (53°F), with highs reaching up to 23°C (74°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec293035435264737266564235
Data source: Temperature data for Lewiston 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 Lewiston

In Lewiston in May, the precipitation amount is 99 mm (3.9 in) over the course of 13 days.

May Precipitation Trends in Lewiston

The chart displays monthly precipitation patterns in Lewiston, 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 Lewiston, May typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec788772118998111585731288990
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Lewiston

In Lewiston in May humidity is 82%. With an average temperature of 11°C (53°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities uncomfortable and sticky, often requiring frequent breaks to escape the muggy atmosphere.

May Average Humidity in Lewiston

This chart illustrates the average monthly humidity levels in Lewiston, 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 Lewiston is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Lewiston

In Lewiston 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 Lewiston.

Maximum UV Index Levels in Lewiston for May

The chart shows the monthly maximum UV Index (UVI) for Lewiston 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 Lewiston typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Lewiston 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 Lewiston Compares to Other Months

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

This table compares monthly weather conditions in Lewiston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)78 mm (3.1 inches)91%low
February Weather-1°C (30°F)87 mm (3.4 inches)91%moderate
March Weather2°C (35°F)71 mm (2.8 inches)88%moderate
April Weather6°C (43°F)118 mm (4.6 inches)88%very high
May Weather11°C (53°F)99 mm (3.9 inches)82%very high
June Weather18°C (64°F)81 mm (3.2 inches)79%very high
July Weather23°C (73°F)115 mm (4.5 inches)77%very high
August Weather22°C (73°F)85 mm (3.3 inches)72%very high
September Weather19°C (66°F)73 mm (2.9 inches)76%high
October Weather13°C (56°F)128 mm (5.0 inches)83%moderate
November Weather6°C (42°F)89 mm (3.5 inches)88%moderate
December Weather1°C (35°F)90 mm (3.5 inches)87%low

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