Black Diamond, WA Weather & Growing Conditions
Today
72°F
Mostly Sunny
Mostly sunny, with a high near 72. North northwest wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Mostly Sunny | 1 mph NNW | 0% |
| Tonight | 51°F | Mostly Clear | 1 mph NE | 0% |
| Sunday | 74°F | Mostly Sunny | 1 mph NNW | 0% |
| Sunday Night | 50°F | Mostly Clear | 1 mph NNE | 0% |
| Monday | 71°F | Mostly Sunny | 2 mph NW | 0% |
| Monday Night | 50°F | Partly Cloudy | 2 mph ENE | 0% |
| Tuesday | 67°F | Partly Sunny | 1 mph WSW | 1% |
| Tuesday Night | 48°F | Mostly Cloudy | 1 mph S | 4% |
| Wednesday | 66°F | Partly Sunny | 1 mph W | 14% |
| Wednesday Night | 49°F | Mostly Cloudy | 1 mph ENE | 14% |
| Thursday | 64°F | Mostly Cloudy then Slight Chance Light Rain | 2 mph NNE | 19% |
| Thursday Night | 48°F | Slight Chance Light Rain | 2 mph ENE | 19% |
| Friday | 62°F | Slight Chance Light Rain | 2 mph WNW | 16% |
| Friday Night | 46°F | Slight Chance Light Rain then Partly Cloudy | 2 mph NE | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Black Diamond, WA
Last spring frost
Apr 20
First fall frost
Oct 25
Growing season
187 days
Hardiness zone
8b
Explore more for Black Diamond, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Landsburg, Wa (4.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.