Monthly outlook for Custer, WA: average high 71.9°, average low 54.6°. That is 0.3° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 8 August (81°), the coolest 9 August (51.8°).
71.9°/54.6°
Average high / low
+0.3°
Above normal
0 / 3
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
74°
72°
+1.1°
18 August – 27 August
68.4°
70.2°
-1°
28 August – 6 September
at normal
68.6°
—
August records over 66 years
95.2°12 August 2021All-time high
44.2°28 August 1969All-time low
Climate normals and records are computed from the nearest reference point — Bellingham (13 mi).
Sun, 0977° / 52°0
77 °
Custer, Sunday, 9 August
Overcast. High 77°, low 52°.
Pressure30.06 inHg
Wind9.1 mph S
Humidity66%
Visibility6.2 mi
Dew point52°
Mon, 1069° / 52°0
69 °
Custer, Monday, 10 August
Clear. High 69°, low 52°.
Pressure30.09 inHg
Wind8.3 mph S
Humidity67%
Visibility6.2 mi
Dew point53°
Tue, 1170° / 53°0
70 °
Custer, Tuesday, 11 August
Clear. High 70°, low 53°.
Pressure30.09 inHg
Wind7.1 mph S
Humidity62%
Visibility6.2 mi
Dew point53°
Wed, 1269° / 54°0
69 °
Custer, Wednesday, 12 August
Clear. High 69°, low 54°.
Pressure30.00 inHg
Wind8.5 mph S
Humidity68%
Visibility6.2 mi
Dew point54°
Thu, 1373° / 54°0
73 °
Custer, Thursday, 13 August
Clear. High 73°, low 54°.
Pressure29.97 inHg
Wind5.7 mph W
Humidity60%
Visibility—
Dew point54°
Fri, 1478° / 56°0
78 °
Custer, Friday, 14 August
Mostly clear. High 78°, low 56°.
Pressure29.97 inHg
Wind8.1 mph W
Humidity46%
Visibility—
Dew point53°
Sat, 1577° / 58°0
77 °
Custer, Saturday, 15 August
Clear. High 77°, low 58°.
Pressure30.00 inHg
Wind5.6 mph SW
Humidity47%
Visibility—
Dew point52°
Sun, 1675° / 58°0
75 °
Custer, Sunday, 16 August
Overcast. High 75°, low 58°.
Pressure30.03 inHg
Wind6.6 mph SE
Humidity51%
Visibility—
Dew point53°
Mon, 1772° / 55°0
72 °
Custer, Monday, 17 August
Partly cloudy. High 72°, low 55°.
Pressure30.00 inHg
Wind6.6 mph S
Humidity52%
Visibility—
Dew point52°
Tue, 1870° / 55°0
70 °
Custer, Tuesday, 18 August
Overcast. High 70°, low 55°.
Pressure30.03 inHg
Wind7.8 mph S
Humidity59%
Visibility—
Dew point53°
Wed, 1967° / 55°0
67 °
Custer, Wednesday, 19 August
Overcast. High 67°, low 55°.
Pressure30.09 inHg
Wind9.7 mph SE
Humidity65%
Visibility—
Dew point54°
Thu, 2068° / 54°0
68 °
Custer, Thursday, 20 August
Mostly clear. High 68°, low 54°.
Pressure30.06 inHg
Wind7.9 mph S
Humidity65%
Visibility—
Dew point54°
Fri, 2169° / 54°0
69 °
Custer, Friday, 21 August
Mostly clear. High 69°, low 54°.
Pressure30.03 inHg
Wind5.8 mph SW
Humidity63%
Visibility—
Dew point53°
Sat, 2270° / 55°0
70 °
Custer, Saturday, 22 August
Partly cloudy. High 70°, low 55°.
Pressure29.97 inHg
Wind10.8 mph SE
Humidity55%
Visibility—
Dew point51°
Sun, 2366° / 53°0
66 °
Custer, Sunday, 23 August
Overcast. High 66°, low 53°.
Pressure30.06 inHg
Wind10.5 mph SE
Humidity64%
Visibility—
Dew point51°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2470° / 56°0.08
70 °
Custer, Monday, 24 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.08 in
Chance of precipitation25%
Record high84° (1996)
Record low51° (1995)
Tue, 2570° / 56°0.07
70 °
Custer, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.07 in
Chance of precipitation22%
Record high90° (1996)
Record low48° (1995)
Wed, 2671° / 56°0.07
71 °
Custer, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high71°
Average low56°
Average precipitation0.07 in
Chance of precipitation25%
Record high87° (1986)
Record low49° (1977)
Thu, 2770° / 56°0.13
70 °
Custer, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.13 in
Chance of precipitation28%
Record high90° (1986)
Record low48° (1965)
Fri, 2870° / 56°0.07
70 °
Custer, Friday, 28 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.07 in
Chance of precipitation22%
Record high88° (1967)
Record low44° (1969)
Sat, 2970° / 56°0.1
70 °
Custer, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.1 in
Chance of precipitation30%
Record high87° (1996)
Record low47° (1965)
Sun, 3068° / 56°0.12
68 °
Custer, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high68°
Average low56°
Average precipitation0.12 in
Chance of precipitation27%
Record high83° (2022)
Record low47° (1965)
Mon, 3168° / 56°0.1
68 °
Custer, Monday, 31 August
Climate normal for this date — 60-year average.
Average high68°
Average low56°
Average precipitation0.1 in
Chance of precipitation27%
Record high89° (1987)
Record low48° (1964)
Tue, 0168° / 55°0.12
68 °
Custer, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.12 in
Chance of precipitation27%
Record high84° (1987)
Record low45° (1973)
Wed, 0269° / 55°0.07
69 °
Custer, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high69°
Average low55°
Average precipitation0.07 in
Chance of precipitation25%
Record high88° (1988)
Record low46° (1960)
Thu, 0369° / 55°0.08
69 °
Custer, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high69°
Average low55°
Average precipitation0.08 in
Chance of precipitation25%
Record high88° (1988)
Record low46° (1975)
Fri, 0468° / 55°0.08
68 °
Custer, Friday, 4 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.08 in
Chance of precipitation28%
Record high87° (2017)
Record low44° (1970)
Sat, 0568° / 55°0.11
68 °
Custer, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.11 in
Chance of precipitation25%
Record high94° (2017)
Record low47° (1969)
Sun, 0668° / 55°0.09
68 °
Custer, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.09 in
Chance of precipitation33%
Record high83° (1987)
Record low46° (1992)
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 Custer, 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 Custer, 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.