Galena weather in August 2026

Q: How hot is it in Galena in August?

Daytime temperatures usually reach 28°C in Galena in August with moderate heat and humidity, falling to 16°C at night.

Q: How sunny is it in Galena in August?

There are normally 9 hours of bright sunshine each day in Galena in August - that's 67% of daylight hours.

Q: How warm is the sea around Galena in August?

The average sea temperature around Galena in August is 21°C.

Q: Does it rain in Galena in August?

There are usually 9 days with some rain in Galena in August and the average monthly rainfall is 97mm.

Expect daytime maximum temperatures of 27°C in Galena, Illinois in August based on long-term weather averages. There are 10 hours of sunshine per day on average with typically 111 mm of rainfall in the month.

27
27°C max day temperature
10
10 hours of sunshine per day
9
9 days with some rainfall
15
15°C min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
111
111 mm of monthly rainfall
8
8 (Very High) UV index

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The August weather guide for Illinois (Galena) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)