August Weather in Lewiston, United States

Last updated: June 24, 2025

In August, the average temperature in Lewiston, United States is a pleasant 20°C (69°F), with daily highs reaching up to 34°C (94°F) and occasional lows dipping to 3°C (38°F). Expect a modest precipitation of 23 mm (0.9 in) over approximately 4 days, and enjoy the comfortable average humidity of around 37%. 🌦️

August Temperature in Lewiston

In August in Lewiston, the average temperature is 20°C (69°F). Maximum temperatures can reach 34°C (94°F), while minimum temperatures can drop as low as 3°C (38°F). Overall, this month offers a pleasant climate for travelers, making it an ideal time to explore Lewiston.

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 (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (38°F).

Data source: Temperature data for Lewiston generated using information from the Copernicus Climate Change Service.

August Precipitation in Lewiston

In Lewiston in August, the total precipitation amount is 23 mm (0.9 in) over a span of 4 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 23 mm (0.9 inches) of precipitation spread over approximately 4 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

August Humidity in Lewiston

In Lewiston in August, humidity is 37%. With an average temperature of 20°C (69°F), this humidity feels like a refreshing embrace, making it quite pleasant for traveling and exploring the sights without feeling weighed down by muggy air.

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 37%, offering insight into how humid the weather typically is during this month.

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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
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 Weather	1°C (34°F)	63 mm (2.5 inches)	84%	very high
April Weather	4°C (40°F)	78 mm (3.1 inches)	74%	very high
May Weather	9°C (49°F)	66 mm (2.6 inches)	62%	extreme
June Weather	17°C (62°F)	31 mm (1.2 inches)	56%	extreme
July Weather	22°C (71°F)	17 mm (0.7 inches)	44%	extreme
August Weather	20°C (69°F)	23 mm (0.9 inches)	37%	extreme
September Weather	15°C (59°F)	36 mm (1.4 inches)	46%	very high
October Weather	6°C (43°F)	49 mm (1.9 inches)	67%	high
November Weather	0°C (33°F)	56 mm (2.2 inches)	84%	moderate
December Weather	-5°C (23°F)	59 mm (2.3 inches)	88%	moderate