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August Weather in Lewiston, United States

Last updated: June 24, 2025

In August, the average temperature in Lewiston, United States hovers around 24°C (75°F). Expect a wide temperature range, with minimums dipping to 9°C (48°F) and maximums soaring to 40°C (105°F). Rain is light, with an average precipitation of 8 mm (0.3 in) over just 2 days. You can also anticipate a comfortable average humidity of 64%.

August Temperature in Lewiston

In August in Lewiston, the average temperature is 24°C (75°F). Maximum can reach 40°C (105°F), and the minimum can be as low as 9°C (48°F). Be prepared for a wide range of temperatures when traveling, so pack accordingly!

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

The chart illustrates August 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, August typically has an average temperature of 24°C (75°F), with highs reaching up to 40°C (105°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec323341495866757564504033
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.

August Precipitation in Lewiston

In Lewiston in August, the precipitation amount is 8 mm (0.3 in) over the course of 2 days.

August Precipitation Trends in Lewiston

The chart displays monthly precipitation patterns in Lewiston, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Lewiston, August typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec5895645147283822526574
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Lewiston

In Lewiston in August humidity is 64%. With average temperature 24°C (75°F), this humidity feels like a warm blanket enveloping you, making outdoor exploration both refreshing and a little sticky, perfect for leisurely strolls and shaded cafes but with a need for frequent water breaks.

August Average Humidity in Lewiston

This chart illustrates the average monthly humidity levels in Lewiston, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Lewiston is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Lewiston

In Lewiston in August, 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 August

The chart shows the monthly maximum UV Index (UVI) for Lewiston in August, 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 August, the maximum UV index in Lewiston typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689101097532
Data source: Lewiston August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)58 mm (2.3 inches)89%low
February Weather1°C (33°F)95 mm (3.7 inches)89%moderate
March Weather5°C (41°F)64 mm (2.5 inches)87%high
April Weather9°C (49°F)51 mm (2.0 inches)84%very high
May Weather14°C (58°F)47 mm (1.8 inches)77%very high
June Weather19°C (66°F)28 mm (1.1 inches)78%very high
July Weather24°C (76°F)3 mm (0.1 inches)77%very high
August Weather24°C (75°F)8 mm (0.3 inches)64%very high
September Weather18°C (64°F)22 mm (0.9 inches)62%high
October Weather10°C (50°F)52 mm (2.1 inches)79%moderate
November Weather4°C (40°F)65 mm (2.6 inches)87%moderate
December Weather1°C (33°F)74 mm (2.9 inches)90%low

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