Oswego, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a village in Kendall County, Illinois.
This Afternoon
70°F
Chance Rain
A chance of rain and a slight chance of thunderstorms. Mostly cloudy. High near 70, with temperatures falling to around 67 in the afternoon. South southeast wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Rain | 15 to 20 mph SSE | 54% |
| Tonight | 59°F | Rain | 15 mph SSE | 87% |
| Wednesday | 62°F | Chance Rain | 15 mph SSW | 51% |
| Wednesday Night | 47°F | Slight Chance Rain then Mostly Cloudy | 15 mph SW | 16% |
| Thursday | 57°F | Chance Rain | 10 to 15 mph WSW | 30% |
| Thursday Night | 42°F | Chance Rain | 5 to 10 mph WNW | 36% |
| Friday | 53°F | Slight Chance Rain | 10 to 15 mph N | 23% |
| Friday Night | 35°F | Partly Cloudy | 5 to 10 mph NNW | 4% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 5% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph WSW | 3% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 14% |
| Sunday Night | 34°F | Mostly Clear | 5 to 10 mph WNW | 6% |
| Monday | 61°F | Sunny | 5 to 10 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Oswego (41.683, -88.339). Updated through the day.
Growing snapshot for Oswego
Last spring frost
Apr 19
First fall frost
Oct 23
Growing season
185 days
Hardiness zone
5b
More local growing data for Oswego: nearby ZIP 60543 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Aurora, Il (7.8 mi from Oswego). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.