Olo Mountain Weather Forecast
- 33
- 41
Rain/Snow
- 25
- 37
Snow
- 24
- 31
Mostly Cloudy
- 28
- 36
Mostly Cloudy
- 31
- 39
Mostly Cloudy
- 34
- 42
Mostly Cloudy
Today 25 Dec Cascades of Snohomish and Northern King Counties
Mostly cloudy. A slight chance of Showers in the Morning, then a chance of Showers early in the afternoon. Rain Showers and snow Showers late in the afternoon. Patchy fog in the afternoon. Areas of freezing fog late in the afternoon. Snow level near 3500 feet. Snow accumulation up to 1 inch. Afternoon pass Temperatures in the lower 30s. Northeast wind in the Passes around 10 Mph becoming east in the afternoon. Gusts to 20 Mph.
Tonight 25 Dec Cascades of Snohomish and Northern King Counties
Mostly cloudy. Widespread dense fog in the evening. Widespread dense freezing fog. Patchy dense fog after midnight. Showers likely in the evening. A chance of Showers after midnight. Snow level near 3500 feet. Lows in the mid 20s. Light wind.
Olo Mountain Temperature Statistics
December Temperature
Arlington Municipal Airport (13.7 miles)
Lowest 1 December, 2025
30 °FAverage December
46.7 °FHighest 15 December, 2025
60.1 °F
Climate (2020–Present)
Arlington Municipal Airport (13.7 miles)
Average Low 2020–2025
42.5 °FAverage 2020–2025
50.8 °FAverage High 2020–2025
59.8 °F