United States of AmericaCountries United States of America Illinois Decatur
United States of AmericaUnited States of America Illinois Decatur
Decatur
Weather averages
ClimateForecastNovemberDecember >>

Decatur (IL) Climate by Month

The graphs below provide an overview of the climate in Decatur (Illinois), the United States of America. They present long-term patterns and averages of weather conditions over a 30-year period.

Average day and night temperature

The mean minimum and maximum temperatures over the year.

Monthly hours of sunshine

The average monthly total hours of sunshine over the year
* Data from: Springfield, the United States of America (59 KM, 36 Miles).

Daily percent of sunshine

The mean percent of hours of sunhours during the day over the year
* Data from: Springfield, the United States of America (59 KM, 36 Miles).

Monthly precipitation

The mean monthly precipitation over the year, including rain, snow, hail etc.

Monthly rainy days

The average number of days each month with rain, snow, hail etc.

Average humidity

The mean monthly relative humidity over the year
* Data from: Springfield, the United States of America (59 KM, 36 Miles).

Forecast for Decatur (IL)

Sat   Nov 02
17°C | 2°C
SE 14 km/h
almost clear and no rain

almost clear and no rain

hourly forecast
Sun   Nov 03
19°C | 7°C
SE 22 km/h
3.4 mm
overcast and rain

overcast and rain

hourly forecast
Mon   Nov 04
22°C | 16°C
S 32 km/h
23 mm
overcast and heavy rain

overcast and heavy rain

hourly forecast
5-Day Forecast 10-Day Forecast

The best time of year to visit Decatur in the United States of America

Other facts from our historical weather data:

  • When is summer in Decatur?
    The hottest season / summer takes place in June, July, August and September.
  • Which is the warmest month in Decatur?
    July has an average maximum temperature of 30°C and is the warmest month of the year.
  • Which is the coldest month in Decatur?
    The coldest month is January with an average maximum temperature of 2°C.
  • Which is the wettest month in Decatur?
    June tops the wettest month list with 149 mm of rainfall.
  • Which is the driest month in Decatur?
    January is the driest month with 43 mm of precipitation.
  • Which is the sunniest month in Decatur?
    July is the sunniest month with an average of 320 hours of sunshine.

    • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

     

     


    Travel Inspiration