Live Weather & Forecast
Weather in Monticello
Illinois, United States · Real-time conditions & 3-day outlook
18°C
Feels like 18°C
65°F / Feels 65°F
Cloudy
Monticello, Illinois
🌞 Daytime
Updated: 2026-04-13 07:00
Humidity
84%
Wind
22.7 km/h SSW
Wind Gust
35.1 km/h
Pressure
1015 mb
Visibility
16 km
UV Index
0.1
(Low)
Precipitation
0 mm
Cloud Cover
0%
Dew Point
16.3°C
Wind Degree
206°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
148.9 μg/m³
NO₂
2.6 μg/m³
O₃
83 μg/m³
SO₂
1.6 μg/m³
PM 2.5
4.5 μg/m³
PM 10
5.1 μg/m³
Today's Hourly Forecast
24-hour breakdown for Monticello, Illinois
12 AM
19°
Patchy rain nearby
1 AM
19°
Clear
2 AM
18°
Clear
3 AM
18°
Clear
4 AM
18°
Clear
5 AM
18°
Clear
6 AM
19°
Overcast
7 AM
18°
Cloudy
8 AM
20°
Overcast
9 AM
21°
Cloudy
10 AM
23°
Partly Cloudy
11 AM
24°
Partly Cloudy
12 PM
26°
Partly Cloudy
1 PM
27°
Partly Cloudy
2 PM
28°
Partly Cloudy
3 PM
29°
Partly Cloudy
4 PM
29°
Sunny
5 PM
26°
Sunny
6 PM
25°
Thundery outbreaks in nearby
7 PM
23°
Thundery outbreaks in nearby
8 PM
22°
Thundery outbreaks in nearby
9 PM
23°
Thundery outbreaks in nearby
10 PM
22°
Cloudy
11 PM
21°
Thundery outbreaks in nearby
3-Day Forecast
Daily overview for Monticello, Illinois
Today
Partly Cloudy
30°
/
18°
🌧️ 0% chance of rain
💧 Avg. humidity: 74%
💨 Max wind: 35.3 km/h
🌧️ Total precip: 0.03 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:19 AM
🌇 Sunset: 07:31 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Patchy rain nearby
25°
/
18°
🌧️ 85% chance of rain
💧 Avg. humidity: 83%
💨 Max wind: 33.8 km/h
🌧️ Total precip: 0.54 mm
☀️ UV Index: 1.3
🌅 Sunrise: 06:18 AM
🌇 Sunset: 07:32 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Wed, Apr 15
Patchy rain nearby
22°
/
19°
🌧️ 81% chance of rain
💧 Avg. humidity: 89%
💨 Max wind: 34.2 km/h
🌧️ Total precip: 3.4 mm
☀️ UV Index: 0.6
🌅 Sunrise: 06:16 AM
🌇 Sunset: 07:33 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Best Time to Visit Monticello
Plan your trip to Monticello, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Monticello?
Current conditions in Monticello: Cloudy, temperature 18°C, humidity 84%.
What is the best time to visit Monticello?
The best time to visit Monticello is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Monticello?
Monticello is located at approximately 40° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Monticello?
The wettest period in Monticello is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Monticello?
For visits to Monticello during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Monticello in?
Monticello is located in United States, in the state of Illinois.
What are the public holidays in Monticello in 2026?
View the 2026 public holidays for Monticello on our Holidays page.
What are the GPS coordinates used for the weather forecast in Monticello?
The weather forecast for Monticello uses coordinates 40.0263, -88.568.