Wellington Weather Forecast
- 39
- 51
Rain Showers Likely
- 40
- 54
Chance Rain Showers
- 44
- 61
Slight Chance Rain
- 45
- 53
Slight Chance Rain
- 46
- 60
Mostly Cloudy
- 49
- 67
Partly Sunny
Today 4 Sep Cascades of Snohomish and Northern King Counties
Partly sunny. A slight chance of rain and snow in the Morning, then Showers Likely, a slight chance of Thunderstorms and Showers likely in the afternoon. Snow level near 7000 feet. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. No snow accumulation. Afternoon pass Temperatures in the lower 50s. Light wind.
Tonight 4 Sep Cascades of Snohomish and Northern King Counties
Mostly cloudy. A chance of rain and snow in the Evening, then a slight chance of rain and snow late in the evening. Snow level near 7000 feet. Lows in the lower 40s. Light wind.
Wellington Temperature Statistics
September Temperature
Stampede Pass (33.6 miles)
Lowest 1 September, 2026
48 °FAverage September
53.3 °FHighest 1 September, 2026
61 °F
Climate (2021–2026)
Stampede Pass (33.6 miles)
Average Low 2021–2026
36.2 °FAverage 2021–2026
41.6 °FAverage High 2021–2026
48.3 °F