Weather in Black Diamond, WA
Black Diamond, Sunday, 18 October, 11:06
Partly cloudy. Feels like 50°. High 60°, low 39°.
Monthly outlook for Black Diamond, WA: average high 55.6°, average low 40.3°. That is 0.2° above the climate normal for October. Precipitation is expected on 6 days (about 2.8 inches), against a normal of 9 days and 3.5 inches. The warmest day looks like 19 October (65.9°), the coolest 31 October (32.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 57.8° | 56.4° | +0.8° |
| 28 October – 6 November | 52° | 52.8° | -0.4° |
| 7 November – 16 November | at normal | 50.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Kent (10 mi).
0
Black Diamond, Monday, 19 October
Overcast. High 66°, low 45°.
0Black Diamond, Tuesday, 20 October
Overcast. High 61°, low 43°.
0
Black Diamond, Wednesday, 21 October
Clear. High 64°, low 39°.
0.14
Black Diamond, Thursday, 22 October
Light rain. High 57°, low 42°.
0Black Diamond, Friday, 23 October
Overcast. High 53°, low 41°.
0Black Diamond, Saturday, 24 October
Overcast. High 60°, low 40°.
0.24Black Diamond, Sunday, 25 October
Light rain. High 51°, low 46°.
0Black Diamond, Monday, 26 October
Overcast. High 51°, low 42°.
0Black Diamond, Tuesday, 27 October
Clear. High 55°, low 37°.
0.08Black Diamond, Wednesday, 28 October
Light rain. High 50°, low 44°.
0.13Black Diamond, Thursday, 29 October
Light rain. High 47°, low 36°.
0Black Diamond, Friday, 30 October
Clear. High 52°, low 33°.
0Black Diamond, Saturday, 31 October
Overcast. High 51°, low 33°.
0.09Black Diamond, Sunday, 1 November
Light rain. High 56°, low 39°.
2.11Black Diamond, Monday, 2 November
Heavy rain. High 57°, low 42°.
0.28Black Diamond, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.34Black Diamond, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.2Black Diamond, Thursday, 5 November
Climate normal for this date — 60-year average.
0.3Black Diamond, Friday, 6 November
Climate normal for this date — 60-year average.
0.28Black Diamond, Saturday, 7 November
Climate normal for this date — 60-year average.
0.19Black Diamond, Sunday, 8 November
Climate normal for this date — 60-year average.
0.24Black Diamond, Monday, 9 November
Climate normal for this date — 60-year average.
0.2Black Diamond, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.24Black Diamond, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.28Black Diamond, Thursday, 12 November
Climate normal for this date — 60-year average.
0.29Black Diamond, Friday, 13 November
Climate normal for this date — 60-year average.
0.31Black Diamond, Saturday, 14 November
Climate normal for this date — 60-year average.
0.24Black Diamond, Sunday, 15 November
Climate normal for this date — 60-year average.
0.23Black Diamond, Monday, 16 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Black Diamond, WA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Black Diamond, WA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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