August Weather in Lewiston, United States

Last updated: June 24, 2025

In Lewiston, United States, the average temperature in August is a pleasant 24°C (76°F). However, temperatures can vary significantly, with a minimum of 11°C (51°F) and soaring to a maximum of 39°C (102°F). Expect a slight chance of rain, with an average precipitation of 4 mm (0.1 in) over just 1 day. The average humidity is a comfortable 60%, making it a great time to explore the area!

August Temperature in Lewiston

In August in Lewiston, the average temperature is 24°C (76°F). Maximum temperatures can reach 39°C (102°F), while minimums can dip as low as 11°C (51°F). This makes Lewiston a great destination for travelers seeking warm weather, but be prepared for the possibility of 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 24°C (76°F), with highs reaching up to 39°C (102°F) and lows dropping to around 11°C (51°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 precipitation amount is 4 mm (0.1 in) over the course of 1 day.

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 4 mm (0.1 inches) of precipitation spread over approximately 1 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 60%. With an average temperature of 24°C (76°F), this humidity feels like a warm, enveloping blanket, making it essential to stay hydrated as you explore. The air is thick, and you may find yourself feeling slightly sticky, but the pleasant warmth allows for enjoyable outdoor activities and leisurely strolls.

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 60%, 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 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 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 10, which falls under the very high 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	4°C (40°F)	163 mm (6.4 inches)	86%	moderate
February Weather	5°C (41°F)	156 mm (6.1 inches)	85%	moderate
March Weather	7°C (44°F)	137 mm (5.4 inches)	85%	high
April Weather	11°C (51°F)	82 mm (3.2 inches)	82%	very high
May Weather	15°C (59°F)	62 mm (2.4 inches)	81%	extreme
June Weather	20°C (69°F)	15 mm (0.6 inches)	79%	extreme
July Weather	25°C (77°F)	2 mm (0.1 inches)	70%	extreme
August Weather	24°C (76°F)	4 mm (0.1 inches)	60%	very high
September Weather	20°C (68°F)	12 mm (0.5 inches)	62%	very high
October Weather	13°C (56°F)	52 mm (2.0 inches)	72%	high
November Weather	8°C (46°F)	97 mm (3.8 inches)	87%	moderate
December Weather	4°C (39°F)	118 mm (4.6 inches)	86%	moderate