Lake Armstrong Weather Forecast
- 55
- 75
Chance Rain Showers
- 53
- 75
Slight Chance Rain Showers
- 53
- 76
Mostly Cloudy
- 53
- 75
Mostly Cloudy
- 50
- 75
Mostly Sunny
- 51
- 79
Mostly Sunny
- 53
- 82
Mostly Sunny
Today 16 Aug Lowlands of Western Skagit and Northwestern Snohomish Counties
Mostly cloudy. A chance of Showers in the morning. A slight chance of Thunderstorms through the day. Showers likely in the afternoon. Rainfall Amounts less than a tenth of an inch Likely, except higher Amounts possible in Thunderstorms. Highs in the upper 60s to mid 70s. Southeast wind 10 to 15 Mph becoming south in the afternoon.
Tonight 16 Aug Lowlands of Western Skagit and Northwestern Snohomish Counties
Mostly cloudy with a chance of Showers. Lows in the mid to upper 50s. Southwest wind to 10 Mph in the evening becoming light.
Lake Armstrong Temperature Statistics
August Temperature
Arlington Municipal Airport (4.3 miles)
Lowest 8 August, 2025
46.9 °FAverage August
66.1 °FHighest 12 August, 2025
93 °F
Climate (2020–Present)
Arlington Municipal Airport (4.3 miles)
Average Low 2020–2025
42.4 °FAverage 2020–2025
50.6 °FAverage High 2020–2025
59.7 °F