Decatur weather
At 7:15 PM local time it was cloudy and 16°C (60°F). Light rain for 2 of the next 24 hours (under 1 mm/h, 1.1 mm total) — cloudy, but fine to be out. Best months for weather: May–Oct. Decatur sits 206 m (676 ft) above sea level, which keeps it cooler than the coast. Below: today's sky, the hour-by-hour rain chance and the 16-day forecast for Decatur, Illinois, United States.
Current conditions
- Clouds
- 100%
- Chance of rain
- 5%
- Rain
- 0.0 mm/h
Hourly Forecast
Light rain for 2 of the next 24 hours (under 1 mm/h, 1.1 mm total) — cloudy, but fine to be out
Daily Forecast
Best Time to Visit
Peak season May–OctOff season Dec–Mar
About Decatur weather
Is it raining in Decatur right now?
No. It’s cloudy and 16° right now. Light rain for 2 of the next 24 hours (under 1 mm/h, 1.1 mm total) — cloudy, but fine to be out.
What’s the weather like in Decatur this week?
Over the next 7 days, expect highs of 11–24° and lows of 10–16°. Rain is likely on 5 of 7 days (Sunday, Tuesday, Wednesday, Thursday, Friday). The driest day looks like Saturday.
Has it been raining in Decatur lately?
Barely. The past 7 days were mostly dry, with 0.3 mm of rain in total.
What should I pack for Decatur?
For the coming week, bring an umbrella or rain jacket and a warm layer for the evenings.
Decatur weather by month
When is the best time to visit Decatur?
Based on weather alone, the best time to visit Decatur is May–Oct, according to NASA's 2001–2025 climate averages. Dec–Mar tends to be the least pleasant. Average highs run from 1°C (34°F) in January to 29°C (85°F) in July.
What is the rainiest month in Decatur?
June is the wettest month, with about 120 mm (4.7 in) of rain on average. February is the driest, with about 56 mm (2.2 in).
What is the hottest month in Decatur?
July is the warmest, with average highs of 29°C (85°F) and lows of 19°C (66°F). January is the coolest, with highs of 1°C (34°F) and lows of -8°C (18°F).
Does Decatur have a rainy season?
Not a strong one. No month averages more than 150 mm of rain; the wettest is June at about 120 mm (4.7 in).
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), forecast and current conditions from Open-Meteo. Page updated . How we rate months