Monticello Weather in October

What's the weather like in Monticello (Illinois) in October 2025?

The climate in Monticello during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Monticello and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 19°C (66°F), whilst at night 7°C (44°F) is normal.

Monticello weather averages (imperial / metric)
Daytime temperature 19°C 66.1°F
Nightly temperature 6.5°C 43.6°F
Average temperature 12.7°C 54.9°F
Daily sunshine 7.3 hrs
Avg rainfall 70 mm 2.7 ins
Rainy days 8 days
Sea temperature 15.2°C 59.4°F
Humidity 69%
Windspeed 15.8kph 10 mph

On average October is the 4th driest month of the year in Monticello with around 70mm 2.7 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.3 hours of sunshine per day.

October temperatures in Monticello

Monticello average temperature in October

October rainfall

Monticello average rain in October

October hourly sunshine

Monticello average rain in October

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Monticello in October 2025.

Other monthly averages

Best places to visit in October

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Monticello weather stats

Monticello weather statistics
Hottest month: July 29.9°C 85.8°F
Driest month: February 46mm 1.8ins
Sunniest month: July 10.9hrs
Coldest month: January -0.2°C 31.6°F
Wettest month: July 110mm 4.3ins
Map showing location of Monticello (40.02781, -88.5734) Monticello map pin © Google

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