Black Diamond Lake Weather Forecast
- 44
- 65
Rain
- 46
- 61
Chance Rain
- 50
- 70
Partly Sunny
- 49
- 75
Mostly Cloudy
- 44
- 60
Chance Rain
- 43
- 62
Partly Sunny
Today 25 May Foothills and Valleys of Pierce and Southern King Counties
Cloudy in the Morning, then a chance of rain early in the afternoon. Cloudy with Showers and a slight chance of Thunderstorms late in the afternoon. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Highs in the 60s. Light wind becoming southwest to 10 Mph in the Afternoon, Gusts to 20 Mph in the afternoon.
Tonight 25 May Foothills and Valleys of Pierce and Southern King Counties
Mostly cloudy. Rain at Times in the Evening, then a chance of rain late in the evening. A slight chance of rain after midnight. Rainfall Amounts less than a tenth of an inch likely. Lows in the 40s. Southwest wind to 10 Mph in the evening becoming light.
Black Diamond Lake Temperature Statistics
May Temperature
Renton Municipal Airport (16.2 miles)
Lowest 17 May, 2026
43 °FAverage May
59.5 °FHighest 12 May, 2026
82 °F
Climate (2021–Present)
Renton Municipal Airport (16.2 miles)
Average Low 2021–2026
47.5 °FAverage 2021–2026
54.7 °FAverage High 2021–2026
62.3 °F