Monthly outlook for Coulee Dam, WA: average high 50.6°, average low 37.9°. That is 0° below the climate normal for October. Precipitation is expected on 6 days (about 1.0 inches), against a normal of 5 days and 1.0 inches. The warmest day looks like 3 November (56.6°), the coolest 29 October (29.1°).
50.6°/37.9°
Average high / low
−0°
Below normal
6 / 5
Wet days / normal
1.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
24 October – 2 November
49.1°
52°
-1.6°
3 November – 12 November
53°
47.3°
+3.2°
13 November – 22 November
at normal
42.9°
—
October records over 66 years
86°1 October 1992All-time high
15.4°31 October 1984All-time low
Climate normals and records are computed from the nearest reference point — Grand Coulee (2 mi).
Sun, 2554° / 39°0
54 °
Coulee Dam, Sunday, 25 October
Overcast. High 54°, low 39°.
Pressure30.03 inHg
Wind1.4 mph N
Humidity46%
Visibility6.2 mi
Dew point28°
Mon, 2653° / 38°0.24
53 °
Coulee Dam, Monday, 26 October
Rain. High 53°, low 38°.
Pressure30.00 inHg
Wind4.4 mph W
Humidity63%
Visibility6.2 mi
Dew point36°
Tue, 2750° / 36°0
50 °
Coulee Dam, Tuesday, 27 October
Overcast. High 50°, low 36°.
Pressure30.00 inHg
Wind2.7 mph SE
Humidity78%
Visibility6.2 mi
Dew point38°
Wed, 2849° / 37°0.08
49 °
Coulee Dam, Wednesday, 28 October
Light rain. High 49°, low 37°.
Pressure29.97 inHg
Wind8 mph S
Humidity76%
Visibility—
Dew point36°
Thu, 2944° / 29°0.24
44 °
Coulee Dam, Thursday, 29 October
Snow. High 44°, low 29°.
Pressure30.00 inHg
Wind3.3 mph NE
Humidity84%
Visibility—
Dew point33°
Fri, 3046° / 33°0
46 °
Coulee Dam, Friday, 30 October
Clear. High 46°, low 33°.
Pressure29.97 inHg
Wind4.1 mph NE
Humidity73%
Visibility—
Dew point33°
Sat, 3144° / 33°0
44 °
Coulee Dam, Saturday, 31 October
Partly cloudy. High 44°, low 33°.
Pressure30.15 inHg
Wind3.1 mph S
Humidity68%
Visibility—
Dew point29°
Sun, 0144° / 37°0
44 °
Coulee Dam, Sunday, 1 November
Overcast. High 44°, low 37°.
Pressure30.42 inHg
Wind4.6 mph E
Humidity59%
Visibility—
Dew point29°
Mon, 0256° / 39°0
56 °
Coulee Dam, Monday, 2 November
Clear. High 56°, low 39°.
Pressure30.39 inHg
Wind4 mph N
Humidity55%
Visibility—
Dew point32°
Tue, 0357° / 42°0
57 °
Coulee Dam, Tuesday, 3 November
Partly cloudy. High 57°, low 42°.
Pressure30.09 inHg
Wind6.1 mph S
Humidity62%
Visibility—
Dew point37°
Wed, 0452° / 44°0.03
52 °
Coulee Dam, Wednesday, 4 November
Light rain. High 52°, low 44°.
Pressure29.77 inHg
Wind7.6 mph SW
Humidity86%
Visibility—
Dew point41°
Thu, 0552° / 45°0.34
52 °
Coulee Dam, Thursday, 5 November
Rain. High 52°, low 45°.
Pressure29.65 inHg
Wind16.2 mph S
Humidity80%
Visibility—
Dew point44°
Fri, 0651° / 40°0.05
51 °
Coulee Dam, Friday, 6 November
Light rain. High 51°, low 40°.
Pressure29.71 inHg
Wind19.7 mph S
Humidity68%
Visibility—
Dew point37°
Sat, 0753° / 37°0
53 °
Coulee Dam, Saturday, 7 November
Mostly clear. High 53°, low 37°.
Pressure30.09 inHg
Wind14.2 mph S
Humidity71%
Visibility—
Dew point36°
Sun, 0854° / 45°0.05
54 °
Coulee Dam, Sunday, 8 November
Light rain. High 54°, low 45°.
Pressure29.65 inHg
Wind17.2 mph S
Humidity58%
Visibility—
Dew point38°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0946° / 35°0.07
46 °
Coulee Dam, Monday, 9 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.07 in
Chance of precipitation37%
Record high62° (1989)
Record low13° (2022)
Tue, 1046° / 35°0.06
46 °
Coulee Dam, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.06 in
Chance of precipitation32%
Record high61° (1989)
Record low13° (2022)
Wed, 1146° / 34°0.07
46 °
Coulee Dam, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high46°
Average low34°
Average precipitation0.07 in
Chance of precipitation33%
Record high59° (1990)
Record low15° (2000)
Thu, 1246° / 35°0.06
46 °
Coulee Dam, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.06 in
Chance of precipitation32%
Record high62° (1999)
Record low21° (1985)
Fri, 1345° / 35°0.1
45 °
Coulee Dam, Friday, 13 November
Climate normal for this date — 60-year average.
Average high45°
Average low35°
Average precipitation0.1 in
Chance of precipitation38%
Record high56° (1967)
Record low16° (2000)
Sat, 1445° / 35°0.05
45 °
Coulee Dam, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high45°
Average low35°
Average precipitation0.05 in
Chance of precipitation23%
Record high62° (2021)
Record low19° (2000)
Sun, 1545° / 34°0.08
45 °
Coulee Dam, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high45°
Average low34°
Average precipitation0.08 in
Chance of precipitation37%
Record high59° (2021)
Record low19° (2000)
Mon, 1644° / 34°0.08
44 °
Coulee Dam, Monday, 16 November
Climate normal for this date — 60-year average.
Average high44°
Average low34°
Average precipitation0.08 in
Chance of precipitation43%
Record high57° (1999)
Record low21° (2022)
Tue, 1744° / 34°0.09
44 °
Coulee Dam, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high44°
Average low34°
Average precipitation0.09 in
Chance of precipitation37%
Record high56° (1976)
Record low19° (2000)
Wed, 1843° / 32°0.05
43 °
Coulee Dam, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high43°
Average low32°
Average precipitation0.05 in
Chance of precipitation32%
Record high53° (2003)
Record low16° (1985)
Thu, 1942° / 32°0.1
42 °
Coulee Dam, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high42°
Average low32°
Average precipitation0.1 in
Chance of precipitation43%
Record high52° (2002)
Record low7° (1985)
Fri, 2042° / 32°0.09
42 °
Coulee Dam, Friday, 20 November
Climate normal for this date — 60-year average.
Average high42°
Average low32°
Average precipitation0.09 in
Chance of precipitation42%
Record high52° (1962)
Record low13° (1985)
Sat, 2140° / 31°0.09
40 °
Coulee Dam, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high40°
Average low31°
Average precipitation0.09 in
Chance of precipitation35%
Record high54° (1974)
Record low-1° (1985)
Sun, 2240° / 30°0.09
40 °
Coulee Dam, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high40°
Average low30°
Average precipitation0.09 in
Chance of precipitation35%
Record high53° (2017)
Record low4° (1985)
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.