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Ottawa
Weather averages
ClimateForecastNovemberDecember >>

Ottawa (IL) Climate by Month

The graphs below provide an overview of the climate in Ottawa (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 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.

Forecast for Ottawa (IL)

Sat   Nov 02
16°C | 0°C
SE 11 km/h
broken clouds and no rain

broken clouds and no rain

hourly forecast
Sun   Nov 03
17°C | 6°C
SE 22 km/h
5.9 mm
overcast and rain

overcast and rain

hourly forecast
Mon   Nov 04
21°C | 15°C
S 29 km/h
14 mm
overcast and thunder

overcast and thunder

hourly forecast
5-Day Forecast 10-Day Forecast

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

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:

  • When is summer in Ottawa?
    The hottest season / summer takes place in June, July, August and September.
  • When is winter in Ottawa?
    The coldest season / winter is in the following months: January, February and December.
  • Which is the warmest month in Ottawa?
    July has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Ottawa?
    The coldest month is January with an average maximum temperature of -1°C.
  • Which is the wettest month in Ottawa?
    June tops the wettest month list with 129 mm of rainfall.
  • Which is the driest month in Ottawa?
    January is the driest month with 46 mm of precipitation.

    • 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.

     

     


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