Ontario, OR Weather & Growing Conditions
Overnight
58°F
Smoke
Smoke. Mostly clear. Low around 58, with temperatures rising to around 62 overnight. North northwest wind around 14 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Smoke | 14 mph NNW | 0% |
| Tuesday | 90°F | Smoke | 2 to 14 mph WSW | 0% |
| Tuesday Night | 62°F | Smoke | 2 to 12 mph NNW | 0% |
| Wednesday | 94°F | Smoke | 2 to 10 mph NE | 0% |
| Wednesday Night | 64°F | Smoke | 1 to 10 mph E | 0% |
| Thursday | 100°F | Areas Of Smoke | 2 to 8 mph E | 0% |
| Thursday Night | 67°F | Areas Of Smoke | 2 to 10 mph NE | 0% |
| Friday | 101°F | Sunny | 3 to 8 mph WNW | 0% |
| Friday Night | 70°F | Mostly Clear | 5 to 14 mph NW | 0% |
| Saturday | 99°F | Sunny | 6 to 12 mph NW | 0% |
| Saturday Night | 69°F | Mostly Clear | 5 to 15 mph NW | 0% |
| Sunday | 96°F | Sunny | 7 to 15 mph NW | 0% |
| Sunday Night | 66°F | Mostly Clear | 6 to 16 mph NNW | 0% |
| Monday | 94°F | Sunny | 6 to 13 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ontario, OR
Last spring frost
Apr 21
First fall frost
Oct 14
Growing season
176 days
Hardiness zone
7a
Explore more for Ontario, OR: full frost dates · planting calendar · Oregon frost dates
Climate data from the nearest NOAA station, Ontario Muni Ap, Or (7.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.