Weather in Coulee Dam, WA
Coulee Dam, Sunday, 9 August, 06:36
Clear. Feels like 56°. High 87°, low 58°.
Monthly outlook for Coulee Dam, WA: average high 94.2°, average low 61.9°. That is 5.1° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 1 days and 0.3 inches. The warmest day looks like 24 August (103.3°), the coolest 11 August (57.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 90.9° | 86.4° | +2.5° |
| 19 August – 28 August | 99.8° | 82.4° | +9.6° |
| 29 August – 7 September | at normal | 80° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Grand Coulee (2 mi).
0
Coulee Dam, Monday, 10 August
Overcast. High 85°, low 59°.
0Coulee Dam, Tuesday, 11 August
Clear. High 91°, low 57°.
0Coulee Dam, Wednesday, 12 August
Clear. High 90°, low 60°.
0Coulee Dam, Thursday, 13 August
Overcast. High 89°, low 59°.
0Coulee Dam, Friday, 14 August
Clear. High 90°, low 59°.
0
Coulee Dam, Saturday, 15 August
Mostly clear. High 95°, low 64°.
0
Coulee Dam, Sunday, 16 August
Partly cloudy. High 99°, low 67°.
0Coulee Dam, Monday, 17 August
Clear. High 93°, low 61°.
0Coulee Dam, Tuesday, 18 August
Clear. High 91°, low 60°.
0Coulee Dam, Wednesday, 19 August
Clear. High 97°, low 63°.
0Coulee Dam, Thursday, 20 August
Clear. High 100°, low 63°.
0Coulee Dam, Friday, 21 August
Partly cloudy. High 97°, low 62°.
0Coulee Dam, Saturday, 22 August
Partly cloudy. High 99°, low 65°.
0Coulee Dam, Sunday, 23 August
Clear. High 102°, low 67°.
0Coulee Dam, Monday, 24 August
Clear. High 103°, low 67°.
0.03Coulee Dam, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.02Coulee Dam, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.01Coulee Dam, Thursday, 27 August
Climate normal for this date — 60-year average.
0.01Coulee Dam, Friday, 28 August
Climate normal for this date — 60-year average.
0.01Coulee Dam, Saturday, 29 August
Climate normal for this date — 60-year average.
0.03Coulee Dam, Sunday, 30 August
Climate normal for this date — 60-year average.
0.02Coulee Dam, Monday, 31 August
Climate normal for this date — 60-year average.
0.02Coulee Dam, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.02Coulee Dam, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.02Coulee Dam, Thursday, 3 September
Climate normal for this date — 60-year average.
0.01Coulee Dam, Friday, 4 September
Climate normal for this date — 60-year average.
0.02Coulee Dam, Saturday, 5 September
Climate normal for this date — 60-year average.
0.03Coulee Dam, Sunday, 6 September
Climate normal for this date — 60-year average.
0.02Coulee Dam, Monday, 7 September
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 Coulee Dam, 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 Coulee Dam, 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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