Oswego, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a community in Kosciusko County, Indiana.
This Afternoon
68°F
Mostly Cloudy
Mostly cloudy. High near 68, with temperatures falling to around 62 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Mostly Cloudy | 15 mph SW | 3% |
| Tonight | 48°F | Mostly Cloudy | 10 mph SW | 9% |
| Thursday | 57°F | Mostly Cloudy | 10 to 15 mph SW | 13% |
| Thursday Night | 41°F | Rain Showers Likely | 5 to 10 mph W | 56% |
| Friday | 51°F | Chance Rain Showers | 5 to 15 mph NW | 46% |
| Friday Night | 34°F | Chance Rain Showers | 0 to 10 mph NW | 30% |
| Saturday | 52°F | Partly Sunny | 0 to 10 mph NW | 7% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 5 mph W | 1% |
| Sunday | 55°F | Sunny | 0 to 10 mph W | 1% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 1% |
| Monday | 59°F | Sunny | 0 to 10 mph W | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 61°F | Sunny | 5 to 10 mph W | 0% |
| Tuesday Night | 36°F | Mostly Clear | 0 to 5 mph NW | 2% |
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 Nov 5, 2026.