Lake Ketchum Weather Forecast
- 51
- 67
Mostly Sunny
- 52
- 71
Mostly Sunny
- 53
- 72
Mostly Sunny
- 53
- 71
Mostly Sunny
- 52
- 69
Partly Sunny
- 52
- 70
Partly Sunny
- 53
- 69
Chance Rain
Today 15 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties
Patchy fog in the morning. Mostly cloudy with a slight chance of Showers until late Afternoon, then mostly sunny late in the afternoon. Highs in the 60s. Light wind becoming northwest to 10 Mph in the afternoon.
Tonight 15 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties
Mostly clear. Patchy fog late in the night. Lows in the upper 40s to mid 50s. Northwest wind to 10 Mph in the evening becoming light.
Lake Ketchum Temperature Statistics
September Temperature
Arlington Municipal Airport (11.8 miles)
Lowest 8 September, 2026
46 °FAverage September
60.1 °FHighest 9 September, 2026
78.1 °F
Climate (2021–2026)
Arlington Municipal Airport (11.8 miles)
Average Low 2021–2026
42.6 °FAverage 2021–2026
50.9 °FAverage High 2021–2026
59.9 °F