Ontario, IN Weather & Growing Conditions
Today
84°F
Sunny
Sunny, with a high near 84. South wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°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 | 1% |
| Wednesday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 70% |
| Thursday | 81°F | Rain Showers Likely | 5 mph SW | 70% |
| Thursday Night | 63°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 68% |
| Friday | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 28% |
| Friday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 28% |
| Saturday | 85°F | Mostly Sunny | 0 to 10 mph SW | 11% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 23% |
| Sunday | 86°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 23% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 10 to 15 mph SW | 39% |
| Monday | 86°F | Chance Rain Showers | 10 mph SW | 39% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 48% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ontario, IN
Last spring frost
Apr 26
First fall frost
Oct 21
Growing season
176 days
Hardiness zone
6a
Explore more for Ontario, IN: full frost dates · planting calendar · Indiana frost dates
Climate data from the nearest NOAA station, Lagrange, In (6.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.