Diablo Lake Weather Forecast
- 51
- 62
Rain Likely
- 51
- 61
Mostly Cloudy
- 49
- 65
Slight Chance Rain
- 52
- 74
Sunny
- 55
- 79
Sunny
- 55
- 77
Mostly Sunny
- 53
- 74
Partly Sunny
Today 13 Sep Foothills and Valleys of the North Cascades
Mostly cloudy. A chance of rain in the late morning and early Afternoon, then a slight chance of rain late in the afternoon. Highs in the mid 60s to lower 70s. Light wind becoming south to 10 Mph with Gusts to 20 Mph in the afternoon.
Tonight 13 Sep Foothills and Valleys of the North Cascades
Mostly cloudy with a chance of rain. Lows in the lower to mid 50s. South wind 10 to 15 Mph with Gusts to 25 Mph.
Diablo Lake Temperature Statistics
September Temperature
Arlington Municipal Airport (60.9 miles)
Lowest 8 September, 2026
46 °FAverage September
60.5 °FHighest 9 September, 2026
78.1 °F
Climate (2021–2026)
Arlington Municipal Airport (60.9 miles)
Average Low 2021–2026
42.6 °FAverage 2021–2026
50.9 °FAverage High 2021–2026
59.9 °F