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Oswego, IN Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a community in Kosciusko County, Indiana.

Today
75°F
Showers And Thunderstorms Likely then Showers And Thunderstorms
Showers and thunderstorms likely before 11am, then showers and thunderstorms between 11am and 2pm, then a chance of showers and thunderstorms. Cloudy, with a high near 75. Southeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast for Oswego

WhenTempForecastWindPrecip
Today 75°F Showers And Thunderstorms Likely then Showers And Thunderstorms 5 to 10 mph SE 90%
Tonight 65°F Showers And Thunderstorms Likely 0 to 5 mph S 79%
Sunday 73°F Showers And Thunderstorms 0 to 10 mph NW 80%
Sunday Night 53°F Chance Showers And Thunderstorms 10 mph NE 48%
Monday 66°F Chance Rain Showers 10 to 15 mph NE 41%
Monday Night 49°F Slight Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 20%
Tuesday 65°F Mostly Cloudy then Slight Chance Rain Showers 10 to 15 mph NE 18%
Tuesday Night 51°F Chance Rain Showers 10 to 15 mph NE 37%
Wednesday 66°F Chance Rain Showers 10 mph NE 37%
Wednesday Night 51°F Slight Chance Rain Showers then Mostly Cloudy 5 to 10 mph NE 19%
Thursday 68°F Partly Sunny 5 to 10 mph NE 2%
Thursday Night 51°F Mostly Cloudy 5 to 10 mph NE 3%
Friday 71°F Mostly Sunny 5 to 10 mph NE 4%
Friday Night 50°F Partly Cloudy 0 to 5 mph NE 4%

Forecast source: National Weather Service (api.weather.gov) for Oswego (41.322, -85.787). Updated through the day.

Growing snapshot for Oswego

Last spring frost
Apr 28
First fall frost
Oct 18
Growing season
170 days
Hardiness zone
6a

More local growing data for Oswego: nearby ZIP 46538 weather · frost dates · planting calendar · Indiana frost dates

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Climate data from the nearest NOAA station, Warsaw, In (5.2 mi from Oswego). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.