Black Diamond, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Black Diamond, a city in King County, Washington.
Overnight
53°F
Patchy Smoke
Patchy smoke. Clear, with a low around 53. East southeast wind around 2 mph.
7-day forecast for Black Diamond
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Patchy Smoke | 2 mph ESE | 0% |
| Tuesday | 87°F | Smoke | 1 to 5 mph NW | 0% |
| Tuesday Night | 57°F | Smoke | 3 mph NE | 0% |
| Wednesday | 92°F | Areas Of Smoke | 2 mph N | 0% |
| Wednesday Night | 59°F | Mostly Clear | 2 mph ENE | 0% |
| Thursday | 91°F | Sunny | 2 mph NW | 0% |
| Thursday Night | 59°F | Mostly Clear | 2 mph S | 0% |
| Friday | 87°F | Sunny | 2 mph WSW | 0% |
| Friday Night | 58°F | Mostly Clear | 2 mph W | 0% |
| Saturday | 83°F | Sunny | 2 mph SW | 0% |
| Saturday Night | 56°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 78°F | Mostly Sunny | 2 mph WNW | 1% |
| Sunday Night | 54°F | Partly Cloudy | 2 mph SSE | 0% |
| Monday | 77°F | Mostly Sunny | 2 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Black Diamond (47.315, -122.018). Updated through the day.
Growing snapshot for Black Diamond
Last spring frost
Apr 20
First fall frost
Oct 25
Growing season
187 days
Hardiness zone
8b
More local growing data for Black Diamond: nearby ZIP 98010 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Algona
Ames Lake
Auburn
Baring
Beaux Arts Village
Bellevue
Bothell
Boulevard Park
Bryn Mawr-Skyway
Burien
Carnation
Clyde Hill
Cottage Lake
Covington
Des Moines
Duvall
East Renton Highlands
Fairwood
Fall City
Federal Way
Greenwater
High Bridge
Hobart
Hunts Point
Index
Issaquah
Kenmore
Kent
Kirkland
Lake Forest Park
Climate data from the nearest NOAA station, Landsburg, Wa (4.6 mi from Black Diamond). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.