August Weather in Evanston, United States

Last updated: June 24, 2025

In Evanston, United States, the average temperature in August hovers around 19°C (67°F). During this time, you can expect a minimum drop to 4°C (40°F) and a peak of 33°C (92°F). The weather brings about 21 mm (0.8 in) of precipitation spread over 5 days, complemented by an average humidity of 37%. Enjoy the delightful mix of warmth and crispness that this season offers!

August Temperature in Evanston

In August in Evanston, the average temperature is 19°C (67°F). Maximums can reach 33°C (92°F) while minimums can be as low as 4°C (40°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities while also being prepared for cooler evenings.

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

The chart illustrates August temperature patterns in Evanston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Evanston, August typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).

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

August Precipitation in Evanston

In Evanston in August, the precipitation amount is 21 mm (0.8 in) spread over a period of 5 days.

August Precipitation Trends in Evanston

The chart displays monthly precipitation patterns in Evanston, 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 Evanston, August typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 5 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 Evanston

In Evanston in August humidity is 37%. With an average temperature of 19°C (67°F), this humidity feels like a refreshing breeze, making it an ideal environment for exploring the local sights and enjoying outdoor activities comfortably.

August Average Humidity in Evanston

This chart illustrates the average monthly humidity levels in Evanston, 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 Evanston 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 Evanston

In Evanston 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 Evanston.

Maximum UV Index Levels in Evanston for August

The chart shows the monthly maximum UV Index (UVI) for Evanston 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 Evanston typically reaches 11, which falls under the extreme exposure category.

Data source: Evanston 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 Evanston Compares to Other Months

Weather in Evanston varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Evanston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Evanston, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	43 mm (1.7 inches)	91%	moderate
February Weather	-5°C (24°F)	52 mm (2.1 inches)	92%	high
March Weather	0°C (32°F)	55 mm (2.2 inches)	84%	very high
April Weather	3°C (38°F)	50 mm (2.0 inches)	74%	very high
May Weather	9°C (48°F)	61 mm (2.4 inches)	62%	extreme
June Weather	16°C (61°F)	21 mm (0.8 inches)	56%	extreme
July Weather	21°C (70°F)	23 mm (0.9 inches)	44%	extreme
August Weather	19°C (67°F)	21 mm (0.8 inches)	37%	extreme
September Weather	14°C (58°F)	27 mm (1.0 inches)	46%	very high
October Weather	5°C (41°F)	35 mm (1.4 inches)	67%	high
November Weather	0°C (33°F)	43 mm (1.7 inches)	84%	moderate
December Weather	-5°C (23°F)	42 mm (1.7 inches)	88%	moderate