Live Weather & Forecast

Weather in Granite City

Illinois, United States · Real-time conditions & 3-day outlook

Flag of United States
Partly cloudy
23°C
Feels like 25°C
74°F / Feels 77°F
Partly cloudy
Granite City, Illinois
🌞 Daytime
Updated: 2026-04-12 10:15
💧
Humidity
53%
💨
Wind
25.6 km/h SSW
🌬️
Wind Gust
31.6 km/h
🌡️
Pressure
1018 mb
👁️
Visibility
16 km
☀️
UV Index
3.3 (Moderate)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
75%
💦
Dew Point
14°C
🌐
Wind Degree
194°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
161.9 μg/m³
NO₂
2.6 μg/m³
O₃
117 μg/m³
SO₂
2.5 μg/m³
PM 2.5
5.7 μg/m³
PM 10
6.2 μg/m³

Weather Alerts 2

Met · Severe · Immediate
Flood Warning issued April 11 at 11:35AM CDT by NWS St Louis MO

...The Flood Warning continues for the following river in Missouri and Illinois... Mississippi River at Clarksville. Mississippi River at Louisiana. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Clarksville. * WHEN...Until further notice....

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx

Effective: 2026-04-11T11:35:00-05:00  ·  Expires: 2026-04-12T23:45:00-05:00
Met · Severe · Immediate
Flood Warning issued April 11 at 9:46PM CDT by NWS St Louis MO

...The Flood Warning continues for the following rivers in Missouri...Illinois... Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Clarksville....

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx

Effective: 2026-04-11T21:46:00-05:00  ·  Expires: 2026-04-13T10:00:00-05:00

Today's Hourly Forecast

24-hour breakdown for Granite City, Illinois

12 AM
Clear
17°
Clear
💧 77% 💨 16.2 km/h
1 AM
Clear
17°
Clear
💧 79% 💨 16.6 km/h
2 AM
Clear
17°
Clear
💧 81% 💨 17.6 km/h
3 AM
Clear
17°
Clear
💧 79% 💨 15.5 km/h
4 AM
Clear
17°
Clear
💧 78% 💨 15.5 km/h
5 AM
Clear
16°
Clear
💧 79% 💨 14.8 km/h
6 AM
Clear
16°
Clear
💧 79% 💨 13.7 km/h
7 AM
Sunny
17°
Sunny
💧 80% 💨 15.1 km/h
8 AM
Sunny
19°
Sunny
💧 71% 💨 18 km/h
9 AM
Sunny
21°
Sunny
💧 62% 💨 22.3 km/h
10 AM
Partly cloudy
23°
Partly cloudy
💧 53% 💨 25.6 km/h
11 AM
Sunny
27°
Sunny
💧 51% 💨 26.6 km/h
12 PM
Sunny
28°
Sunny
💧 45% 💨 28.1 km/h
1 PM
Sunny
28°
Sunny
💧 42% 💨 29.9 km/h
2 PM
Sunny
29°
Sunny
💧 38% 💨 29.9 km/h
3 PM
Sunny
30°
Sunny
💧 35% 💨 27.7 km/h
4 PM
Sunny
28°
Sunny
💧 34% 💨 22.3 km/h
5 PM
Overcast
27°
Overcast
💧 42% 💨 26.3 km/h
6 PM
Overcast
25°
Overcast
💧 44% 💨 25.9 km/h
7 PM
Overcast
24°
Overcast
💧 51% 💨 28.8 km/h
8 PM
Overcast
24°
Overcast
💧 51% 💨 29.2 km/h
9 PM
Cloudy
23°
Cloudy
💧 50% 💨 30.2 km/h
10 PM
Overcast
22°
Overcast
💧 59% 💨 29.5 km/h
11 PM
Overcast
19°
Overcast
💧 52% 💨 29.2 km/h

3-Day Forecast

Daily overview for Granite City, Illinois

Today
Sunny
Sunny
31° / 16°
🌧️ 0% chance of rain
💧 Avg. humidity: 59%
💨 Max wind: 30.2 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:28 AM
🌇 Sunset: 07:35 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Thundery outbreaks in nearby
Thundery outbreaks in nearby
30° / 17°
🌧️ 0% chance of rain
💧 Avg. humidity: 72%
💨 Max wind: 29.2 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 2
🌅 Sunrise: 06:27 AM
🌇 Sunset: 07:36 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Thundery outbreaks in nearby
Thundery outbreaks in nearby
27° / 20°
🌧️ 0% chance of rain
💧 Avg. humidity: 74%
💨 Max wind: 28.8 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.9
🌅 Sunrise: 06:25 AM
🌇 Sunset: 07:37 PM
🌙 Waning Crescent
🌑 Moon: 15% lit

Best Time to Visit Granite City

Plan your trip to Granite City, 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.
← Back to Granite City 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Granite City?
Current conditions in Granite City: Partly cloudy, temperature 23°C, humidity 53%.
What is the best time to visit Granite City?
The best time to visit Granite City is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Granite City?
Granite City is located at approximately 38.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Granite City?
The wettest period in Granite City is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Granite City?
For visits to Granite City during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Granite City in?
Granite City is located in United States, in the state of Illinois.
What are the public holidays in Granite City in 2026?
View the 2026 public holidays for Granite City on our Holidays page.
What are the GPS coordinates used for the weather forecast in Granite City?
The weather forecast for Granite City uses coordinates 38.7014, -90.1487.