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April Weather in Lewiston, United States

Last updated: June 24, 2025

In April, the average temperature in Lewiston, United States hovers around 4°C (40°F). While you might experience chilly lows of -12°C (10°F), the weather can pleasantly warm up to a maximum of 22°C (71°F). Expect 78 mm (3.1 in) of precipitation spread over 12 days, contributing to an average humidity of 74%. Get ready for a varied climate that keeps you on your toes!

April Temperature in Lewiston

In April in Lewiston, the average temperature is 4°C (40°F). Maximums can reach 22°C (71°F), while minimums can drop as low as -12°C (10°F). Be prepared for a wide range of temperatures when traveling to Lewiston during this month.

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

The chart illustrates April 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, April typically has an average temperature of 4°C (40°F), with highs reaching up to 22°C (71°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec232534404962716959433323
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.

April Precipitation in Lewiston

In Lewiston in April, the precipitation amount is 78 mm (3.1 in), occurring over a span of 12 days.

April Precipitation Trends in Lewiston

The chart displays monthly precipitation patterns in Lewiston, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Lewiston, April typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec698963786631182336495659
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Lewiston

In Lewiston in April humidity is 74%. With an average temperature of 4°C (40°F), this humidity feels like a chilly embrace that makes every breath a little heavier, which can be quite uncomfortable for traveling.

April Average Humidity in Lewiston

This chart illustrates the average monthly humidity levels in Lewiston, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Lewiston is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%84%75%62%56%44%37%46%67%84%88%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Lewiston

In Lewiston in April, 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 Lewiston.

Maximum UV Index Levels in Lewiston for April

The chart shows the monthly maximum UV Index (UVI) for Lewiston in April, 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 April, the maximum UV index in Lewiston typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35810111211119653
Data source: Lewiston April 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 April 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 April’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 April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)68 mm (2.7 inches)91%moderate
February Weather-4°C (25°F)89 mm (3.5 inches)92%moderate
March Weather1°C (34°F)63 mm (2.5 inches)84%very high
April Weather4°C (40°F)78 mm (3.1 inches)74%very high
May Weather9°C (49°F)66 mm (2.6 inches)62%extreme
June Weather17°C (62°F)31 mm (1.2 inches)56%extreme
July Weather22°C (71°F)17 mm (0.7 inches)44%extreme
August Weather20°C (69°F)23 mm (0.9 inches)37%extreme
September Weather15°C (59°F)36 mm (1.4 inches)46%very high
October Weather6°C (43°F)49 mm (1.9 inches)67%high
November Weather0°C (33°F)56 mm (2.2 inches)84%moderate
December Weather-5°C (23°F)59 mm (2.3 inches)88%moderate

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