Live Weather & Forecast

Weather in Chatham

Q: What is the current weather in Chatham?

Current conditions in Chatham: Overcast, temperature 23°C, humidity 50%.

Q: What is the best time to visit Chatham?

The best time to visit Chatham is typically June – September. Warm, dry summers — ideal for outdoor activities.

Q: What are the GPS coordinates used for the weather forecast in Chatham?

The weather forecast for Chatham uses coordinates 39.6762, -89.7045.

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

23^°C

Feels like 25°C

73°F / Feels 77°F

Overcast

Chatham, Illinois

🌙 Nighttime

Updated: 2026-04-12 21:15

💧

Humidity

50%

💨

Wind

39.6 km/h SSW

🌬️

Wind Gust

62.6 km/h

🌡️

Pressure

1010 mb

👁️

Visibility

16 km

☀️

UV Index

0 (Low)

🌧️

Precipitation

0.37 mm

☁️

Cloud Cover

100%

💦

Dew Point

13.4°C

🌐

Wind Degree

208°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)

136.9 μg/m³

NO₂

3.8 μg/m³

O₃

102 μg/m³

SO₂

2.1 μg/m³

PM 2.5

4 μg/m³

PM 10

4.2 μg/m³

Weather Alerts 2

Met · Severe · Immediate

Flood Warning issued April 12 at 11:40AM CDT by NWS Lincoln IL

...The Flood Warning continues for the following rivers in Illinois... Illinois River near Havana affecting Fulton, Cass and Mason Counties. Illinois River at Beardstown affecting Brown, Morgan, Cass and Schuyler Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is occurring and minor flooding i...

Caution is urged when walking near riverbanks. Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Additional information is available at www.weather.gov.

Effective: 2026-04-12T11:40:00-05:00 · Expires: 2026-04-13T03:45:00-05:00

Met · Severe · Immediate

Flood Warning issued April 12 at 11:40AM CDT by NWS Lincoln IL

Effective: 2026-04-12T11:40:00-05:00 · Expires: 2026-04-13T03:45:00-05:00

Today's Hourly Forecast

24-hour breakdown for Chatham, Illinois

12 AM

16°

Clear

💧 81% 💨 19.4 km/h

1 AM

16°

Clear

💧 80% 💨 19.8 km/h

2 AM

16°

Clear

💧 82% 💨 19.8 km/h

3 AM

16°

Clear

💧 84% 💨 20.9 km/h

4 AM

16°

Clear

💧 83% 💨 20.5 km/h

5 AM

16°

Clear

💧 81% 💨 18.7 km/h

6 AM

16°

Clear

💧 80% 💨 19.4 km/h

7 AM

17°

Sunny

💧 80% 💨 21.2 km/h

8 AM

19°

Sunny

💧 70% 💨 22.3 km/h

9 AM

21°

Sunny

💧 59% 💨 24.8 km/h

10 AM

25°

Sunny

💧 49% 💨 28.4 km/h

11 AM

27°

Sunny

💧 44% 💨 31.3 km/h

12 PM

27°

Sunny

💧 40% 💨 33.1 km/h

1 PM

29°

Partly Cloudy

💧 43% 💨 33.1 km/h

2 PM

29°

Sunny

💧 38% 💨 33.8 km/h

3 PM

29°

Sunny

💧 35% 💨 32 km/h

4 PM

28°

Sunny

💧 38% 💨 32.4 km/h

5 PM

27°

Patchy rain nearby

💧 45% 💨 41.4 km/h 🌧️ 69%

6 PM

26°

Patchy rain nearby

💧 50% 💨 32.8 km/h 🌧️ 82%

7 PM

24°

Patchy rain nearby

💧 52% 💨 35.3 km/h 🌧️ 89%

8 PM

22°

Patchy rain nearby

💧 58% 💨 40.3 km/h 🌧️ 80%

9 PM

23°

Overcast

💧 50% 💨 39.6 km/h 🌧️ 100%

10 PM

19°

Patchy light rain

💧 76% 💨 32.8 km/h 🌧️ 100%

11 PM

19°

Patchy rain nearby

💧 86% 💨 31.7 km/h 🌧️ 100%

3-Day Forecast

Daily overview for Chatham, Illinois

Today

Patchy rain nearby

30° / 15°

🌧️ 89% chance of rain

💧 Avg. humidity: 63%

💨 Max wind: 41.4 km/h

🌧️ Total precip: 1.47 mm

☀️ UV Index: 1.6

🌅 Sunrise: 06:25 AM

🌇 Sunset: 07:34 PM

🌙 Waning Crescent

🌑 Moon: 33% lit

Mon, Apr 13

Thundery outbreaks in nearby

25° / 18°

🌧️ 0% chance of rain

💧 Avg. humidity: 85%

💨 Max wind: 31.7 km/h

🌧️ Total precip: 0.06 mm

☀️ UV Index: 1.9

🌅 Sunrise: 06:24 AM

🌇 Sunset: 07:35 PM

🌙 Waning Crescent

🌑 Moon: 23% lit

Tue, Apr 14

Thundery outbreaks in nearby

26° / 20°

🌧️ 0% chance of rain

💧 Avg. humidity: 80%

💨 Max wind: 32.8 km/h

🌧️ Total precip: 0 mm

☀️ UV Index: 1.8

🌅 Sunrise: 06:22 AM

🌇 Sunset: 07:36 PM

🌙 Waning Crescent

🌑 Moon: 15% lit

Best Time to Visit Chatham

Plan your trip to Chatham, 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 Chatham 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Chatham?

Current conditions in Chatham: Overcast, temperature 23°C, humidity 50%.

What is the best time to visit Chatham?

The best time to visit Chatham is typically June – September. Warm, dry summers — ideal for outdoor activities.

What is the climate like in Chatham?

Chatham is located at approximately 39.7° latitude. It has a temperate climate with warm summers and cold winters.

Does it rain a lot in Chatham?

The wettest period in Chatham is typically during November – March. Cooler temperatures; some regions may experience rain or snow.

What should I pack for a trip to Chatham?

For visits to Chatham during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.

What country is Chatham in?

Chatham is located in United States, in the state of Illinois.

What are the public holidays in Chatham in 2026?

View the 2026 public holidays for Chatham on our Holidays page.

What are the GPS coordinates used for the weather forecast in Chatham?

The weather forecast for Chatham uses coordinates 39.6762, -89.7045.