Weather in Grand Coulee, WA
Grand Coulee, Sunday, 9 August, 12:08
Clear. Feels like 76°. High 84°, low 56°.
Monthly outlook for Grand Coulee, WA: average high 90.1°, average low 61.8°. That is 2.8° 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 (100.8°), the coolest 9 August (56.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 87.3° | 86.4° | +0.5° |
| 19 August – 28 August | 94.7° | 82.4° | +6.8° |
| 29 August – 7 September | at normal | 80° | — |
August records over 66 years
0
Grand Coulee, Monday, 10 August
Mostly clear. High 84°, low 58°.
0Grand Coulee, Tuesday, 11 August
Clear. High 90°, low 57°.
0Grand Coulee, Wednesday, 12 August
Clear. High 88°, low 59°.
0Grand Coulee, Thursday, 13 August
Clear. High 88°, low 58°.
0Grand Coulee, Friday, 14 August
Clear. High 89°, low 59°.
0
Grand Coulee, Saturday, 15 August
Light rain. High 92°, low 63°.
0.04Grand Coulee, Sunday, 16 August
Light rain. High 86°, low 57°.
0
Grand Coulee, Monday, 17 August
Overcast. High 83°, low 59°.
0Grand Coulee, Tuesday, 18 August
Overcast. High 88°, low 69°.
0Grand Coulee, Wednesday, 19 August
Overcast. High 87°, low 63°.
0
Grand Coulee, Thursday, 20 August
Partly cloudy. High 91°, low 63°.
0Grand Coulee, Friday, 21 August
Mostly clear. High 94°, low 66°.
0Grand Coulee, Saturday, 22 August
Clear. High 97°, low 66°.
0Grand Coulee, Sunday, 23 August
Mostly clear. High 99°, low 67°.
0Grand Coulee, Monday, 24 August
Clear. High 101°, low 69°.
0.03Grand Coulee, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.02Grand Coulee, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.01Grand Coulee, Thursday, 27 August
Climate normal for this date — 60-year average.
0.01Grand Coulee, Friday, 28 August
Climate normal for this date — 60-year average.
0.01Grand Coulee, Saturday, 29 August
Climate normal for this date — 60-year average.
0.03Grand Coulee, Sunday, 30 August
Climate normal for this date — 60-year average.
0.02Grand Coulee, Monday, 31 August
Climate normal for this date — 60-year average.
0.02Grand Coulee, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.02Grand Coulee, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.02Grand Coulee, Thursday, 3 September
Climate normal for this date — 60-year average.
0.01Grand Coulee, Friday, 4 September
Climate normal for this date — 60-year average.
0.02Grand Coulee, Saturday, 5 September
Climate normal for this date — 60-year average.
0.03Grand Coulee, Sunday, 6 September
Climate normal for this date — 60-year average.
0.02Grand Coulee, 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 Grand Coulee, 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 Grand Coulee, 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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