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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 20°C (68°F), making it a pleasant time to visit. Temperatures can range from a cool 5°C (41°F) to a warm 32°C (90°F). Visitors should be prepared for some rain, as 95 mm (3.7 in) of precipitation typically falls over 12 days. The average humidity sits at a comfortable 75%, adding to the overall atmosphere of the season.

August Temperature in Lewiston

In August in Lewiston, the average temperature is 20°C (68°F). Maximums can reach 32°C (90°F), and minimums can dip as low as 5°C (41°F). This variety in temperatures makes it a great time for travelers to enjoy both warm days and cooler nights.

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 20°C (68°F), with highs reaching up to 32°C (90°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec202030415565706760483427
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 95 mm (3.7 in) over the course of 12 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 95 mm (3.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec495555941011058795691166264
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 75%. With an average temperature of 20°C (68°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and exhausted.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%91%87%86%79%75%75%75%79%85%88%89%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
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 Weather-7°C (20°F)49 mm (1.9 inches)92%low
February Weather-6°C (21°F)55 mm (2.1 inches)91%moderate
March Weather-1°C (30°F)55 mm (2.2 inches)87%moderate
April Weather5°C (41°F)94 mm (3.7 inches)85%high
May Weather13°C (55°F)101 mm (4.0 inches)79%very high
June Weather18°C (65°F)105 mm (4.1 inches)75%very high
July Weather21°C (70°F)87 mm (3.4 inches)75%very high
August Weather20°C (68°F)95 mm (3.7 inches)75%very high
September Weather16°C (60°F)69 mm (2.7 inches)79%high
October Weather9°C (48°F)116 mm (4.6 inches)85%moderate
November Weather1°C (34°F)62 mm (2.4 inches)88%moderate
December Weather-3°C (27°F)64 mm (2.5 inches)89%low

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