Monthly outlook for Chapman, OR: average high 60.1°, average low 41.5°. That is 0.7° above the climate normal for October. Precipitation is expected on 2 days (about 0.6 inches), against a normal of 7 days and 2.7 inches. The warmest day looks like 16 October (72.7°), the coolest 12 October (35.5°).
60.1°/41.5°
Average high / low
+0.7°
Above normal
2 / 7
Wet days / normal
0.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
59.6°
60°
-0.2°
22 October – 31 October
61°
55.6°
+3°
1 November – 10 November
at normal
52.6°
—
October records over 66 years
88.5°1 October 1987All-time high
27.3°28 October 1971All-time low
Climate normals and records are computed from the nearest reference point — Vernonia (10 mi).
Tue, 1361° / 36°0
61 °
Chapman, Tuesday, 13 October
Mostly clear. High 61°, low 36°.
Pressure30.21 inHg
Wind1.7 mph SE
Humidity50%
Visibility6.2 mi
Dew point40°
Wed, 1463° / 45°0
63 °
Chapman, Wednesday, 14 October
Overcast. High 63°, low 45°.
Pressure30.27 inHg
Wind0.5 mph NE
Humidity56%
Visibility6.2 mi
Dew point46°
Thu, 1571° / 47°0
71 °
Chapman, Thursday, 15 October
Clear. High 71°, low 47°.
Pressure30.27 inHg
Wind8.2 mph E
Humidity41%
Visibility6.2 mi
Dew point44°
Fri, 1673° / 51°0
73 °
Chapman, Friday, 16 October
Clear. High 73°, low 51°.
Pressure30.15 inHg
Wind7.2 mph NW
Humidity38%
Visibility—
Dew point39°
Sat, 1759° / 44°0.03
59 °
Chapman, Saturday, 17 October
Light rain. High 59°, low 44°.
Pressure30.12 inHg
Wind7.9 mph NW
Humidity76%
Visibility—
Dew point48°
Sun, 1860° / 41°0
60 °
Chapman, Sunday, 18 October
Partly cloudy. High 60°, low 41°.
Pressure30.15 inHg
Wind3.4 mph NW
Humidity67%
Visibility—
Dew point41°
Mon, 1945° / 43°0.46
45 °
Chapman, Monday, 19 October
Rain. High 45°, low 43°.
Pressure29.85 inHg
Wind6.5 mph SE
Humidity98%
Visibility—
Dew point43°
Tue, 2050° / 40°0.17
50 °
Chapman, Tuesday, 20 October
Light rain. High 50°, low 40°.
Pressure29.91 inHg
Wind4.1 mph S
Humidity84%
Visibility—
Dew point42°
Wed, 2155° / 38°0
55 °
Chapman, Wednesday, 21 October
Clear. High 55°, low 38°.
Pressure30.15 inHg
Wind6.5 mph N
Humidity83%
Visibility—
Dew point42°
Thu, 2257° / 36°0
57 °
Chapman, Thursday, 22 October
Clear. High 57°, low 36°.
Pressure30.18 inHg
Wind4.9 mph N
Humidity59%
Visibility—
Dew point35°
Fri, 2351° / 38°0
51 °
Chapman, Friday, 23 October
Overcast. High 51°, low 38°.
Pressure30.24 inHg
Wind3.4 mph S
Humidity71%
Visibility—
Dew point38°
Sat, 2460° / 42°0
60 °
Chapman, Saturday, 24 October
Partly cloudy. High 60°, low 42°.
Pressure30.45 inHg
Wind5.5 mph NW
Humidity63%
Visibility—
Dew point42°
Sun, 2566° / 41°0
66 °
Chapman, Sunday, 25 October
Partly cloudy. High 66°, low 41°.
Pressure30.39 inHg
Wind6.4 mph NE
Humidity55%
Visibility—
Dew point38°
Mon, 2668° / 43°0
68 °
Chapman, Monday, 26 October
Partly cloudy. High 68°, low 43°.
Pressure30.24 inHg
Wind3.8 mph N
Humidity46%
Visibility—
Dew point37°
Tue, 2763° / 45°0
63 °
Chapman, Tuesday, 27 October
Overcast. High 63°, low 45°.
Pressure30.09 inHg
Wind4.5 mph SE
Humidity51%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2854° / 42°0.24
54 °
Chapman, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.24 in
Chance of precipitation57%
Record high71° (1987)
Record low27° (1971)
Thu, 2954° / 42°0.17
54 °
Chapman, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.17 in
Chance of precipitation45%
Record high70° (1962)
Record low30° (1971)
Fri, 3054° / 42°0.21
54 °
Chapman, Friday, 30 October
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.21 in
Chance of precipitation47%
Record high66° (1993)
Record low30° (1972)
Sat, 3154° / 42°0.28
54 °
Chapman, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.28 in
Chance of precipitation52%
Record high68° (1966)
Record low30° (2003)
Sun, 0154° / 42°0.24
54 °
Chapman, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.24 in
Chance of precipitation47%
Record high68° (1962)
Record low29° (2003)
Mon, 0254° / 42°0.2
54 °
Chapman, Monday, 2 November
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.2 in
Chance of precipitation50%
Record high66° (1981)
Record low30° (2002)
Tue, 0354° / 43°0.22
54 °
Chapman, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high54°
Average low43°
Average precipitation0.22 in
Chance of precipitation57%
Record high66° (2010)
Record low28° (2003)
Wed, 0454° / 43°0.29
54 °
Chapman, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high54°
Average low43°
Average precipitation0.29 in
Chance of precipitation63%
Record high68° (1980)
Record low30° (2003)
Thu, 0552° / 42°0.24
52 °
Chapman, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high52°
Average low42°
Average precipitation0.24 in
Chance of precipitation70%
Record high65° (1987)
Record low28° (1971)
Fri, 0652° / 42°0.31
52 °
Chapman, Friday, 6 November
Climate normal for this date — 60-year average.
Average high52°
Average low42°
Average precipitation0.31 in
Chance of precipitation65%
Record high62° (2012)
Record low30° (2003)
Sat, 0752° / 42°0.26
52 °
Chapman, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high52°
Average low42°
Average precipitation0.26 in
Chance of precipitation62%
Record high61° (1978)
Record low33° (1973)
Sun, 0852° / 40°0.21
52 °
Chapman, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.21 in
Chance of precipitation53%
Record high66° (1976)
Record low31° (1977)
Mon, 0951° / 41°0.22
51 °
Chapman, Monday, 9 November
Climate normal for this date — 60-year average.
Average high51°
Average low41°
Average precipitation0.22 in
Chance of precipitation62%
Record high64° (1996)
Record low27° (2020)
Tue, 1051° / 40°0.2
51 °
Chapman, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.2 in
Chance of precipitation50%
Record high65° (2016)
Record low29° (1978)
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 Chapman, OR 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 Chapman, OR 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.