Summerville Weather Forecast
- 31
- 67
Mostly Sunny
- 39
- 70
Sunny
- 42
- 72
Breezy
- 32
- 70
Mostly Sunny
- 35
- 68
Partly Sunny
- 31
- 60
Rain Showers Likely
Today 14 Oct Grande Ronde Valley
Mostly sunny. Widespread frost in the morning. Highs in the upper 60s. Light wind.
Tonight 14 Oct Grande Ronde Valley
Mostly clear. Areas of frost overnight. Lows in the upper 20s to mid 30s. Northwest wind 5 to 10 Mph in the Evening, becoming light.
Summerville Temperature Statistics
October Temperature
La Grande/Union County Airport (13 miles)
Lowest 3 October, 2026
35.1 °FAverage October
55 °FHighest 4 October, 2026
89.1 °F
Climate (2021–2026)
La Grande/Union County Airport (13 miles)
Average Low 2021–2026
38.3 °FAverage 2021–2026
50.6 °FAverage High 2021–2026
62.8 °F