Oswego, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a community in Kosciusko County, Indiana.
Today
83°F
Sunny
Sunny, with a high near 83. South wind 0 to 5 mph.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 0 to 5 mph S | 0% |
| Tonight | 60°F | Mostly Clear | 0 to 5 mph S | 0% |
| Wednesday | 84°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 65°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 63% |
| Thursday | 81°F | Rain Showers Likely | 0 to 5 mph SW | 70% |
| Thursday Night | 64°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 70% |
| Friday | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 27% |
| Friday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 27% |
| Saturday | 84°F | Mostly Sunny | 0 to 5 mph SW | 12% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 18% |
| Sunday | 86°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph SW | 18% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 37% |
| Monday | 86°F | Chance Rain Showers | 5 to 10 mph SW | 37% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 43% |
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 Aug 4, 2026.