Oswego weather
Loading live data…Latest for Oswego: NWS (National Blend (NBM)): 49° Mainly clear · American (NOAA GFS): 47° Clear · European (ECMWF): 51° Overcast.
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active National Weather Service watches, warnings and advisoriesChecking the National Weather Service for active alerts covering Oswego…
Oswego weather in numbers
measured normals and 10 years of recorded weatherOswego swings 66°F across the year, from 83°F highs in July to 17°F lows in January, and June is usually the wettest month in a year that brings about 42 in of precipitation. Over 10 years of recorded weather it averages 104 days a year at 77°F or above, 29 of them at 86°F or above, 117 frost nights, and rain on 129 days.
Day counts are from the ERA5 reanalysis for Oswego’s grid square, 2016 to 2025, counted the same way for every city so the numbers compare. A reanalysis square is an area, not a weather station, so it is good for counting days and not for a single day’s record.
The weather map: all three models at once
NWS, American, European side by side around Oswego and nearby towns.Live rain radar →Oswego hourly forecast: next 14 hours
consensus of the three modelsRain in the next 24 hours, model by model
each model's own hourly precipitation, side by sideLoading the three models…
Oswego 10-day forecast, out to 14 days
where the models agree, and where they splitOswego, Illinois (IL) is at its warmest in Jul (average highs near 83°F) and coldest in Jan (lows around 17°F), with roughly 42 in of precipitation across the year. Below, compare what NWS, American, European forecast for Oswego right now, and see exactly where they disagree.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.
Oswego climate by month
average daytime high and overnight low across a typical year (1991-2020)Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How the weather around Oswego has changed since 1995
Oswego sits in the same roughly 50 km square of NASA's reanalysis as Joliet. That square shows no clear change in temperature between 1995-2004 and 2015-2024. See the full 30-year picture on the Joliet page.
Which forecast is most accurate in Oswego?
CheckWeather Score, graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy, each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.
What do you think of the forecasts?
your vote countsThe accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.
One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.