Galena weather in May 2026

Q: How hot is it in Galena in May?

Daytime temperatures usually reach 21°C in Galena in May, falling to 9°C at night.

Q: How sunny is it in Galena in May?

There are normally 9 hours of bright sunshine each day in Galena in May - that's 62% of daylight hours.

Q: Is the sea cold around Galena in May?

The average sea temperature around Galena in May is 6°C.

Q: Does it rain in Galena in May?

There are usually 11 days with some rain in Galena in May and the average monthly rainfall is 84mm.

Expect daytime maximum temperatures of 70°F in Galena, Illinois in May based on long-term weather averages. There are 10 hours of sunshine per day on average with 11 days with some rainfall and typically 3.9 inches of rainfall in the month.

70
70°F max day temperature
10
10 hours of sunshine per day
11
11 days with some rainfall
48
48°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
3.9
3.9 inches of monthly rainfall
7
7 (High) UV index

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The May 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) | Imperial (°F)