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Sumpter, OR Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Sumpter, a city in Grant County, Oregon.

This Afternoon
73°F
Sunny
Sunny, with a high near 73. East northeast wind around 2 mph.

7-day forecast for Sumpter

WhenTempForecastWindPrecip
This Afternoon 73°F Sunny 2 mph ENE 1%
Tonight 45°F Partly Cloudy 1 mph NE 1%
Sunday 76°F Sunny 2 mph ESE 1%
Sunday Night 46°F Mostly Clear 1 mph NE 0%
Monday 76°F Sunny 0 to 3 mph SE 0%
Monday Night 47°F Partly Cloudy 1 mph ENE 0%
Tuesday 77°F Mostly Sunny 2 mph W 5%
Tuesday Night 45°F Partly Cloudy 1 mph NNW 5%
Wednesday 74°F Sunny 0 to 5 mph WNW 1%
Wednesday Night 43°F Partly Cloudy 0 to 3 mph NNW 2%
Thursday 74°F Mostly Sunny 0 to 5 mph SE 2%
Thursday Night 44°F Partly Cloudy 0 to 3 mph NE 6%
Friday 69°F Mostly Sunny 0 to 5 mph W 8%
Friday Night 40°F Mostly Cloudy 0 to 5 mph NW 8%

Forecast source: National Weather Service (api.weather.gov) for Sumpter (44.744, -118.197). Updated through the day.

Growing snapshot for Sumpter

Growing season
74 days
Hardiness zone
6b

More local growing data for Sumpter: nearby ZIP 97877 weather · frost dates · planting calendar · Oregon frost dates

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Climate data from the nearest NOAA station, Austin 3 S, Or (17 mi from Sumpter). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.