United States · 1991–2020

Best time to visit
Chapman Landing.

September leads for comfortable weather in Chapman Landing: typically 24.3°C by day, 9.7°C at night, with 39 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.3°C

Typical low9.7°C

Rain in September39 mm

Comfort

September

September · July · June

87climate match

Beach

August

August · July · September

72climate match

Outdoors

June

June · May · September

87climate match

The weakest month is January, scoring 5 against September’s 87 — days reach only 8°C, 16° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

58° / 0.8°

Feb

910.2° / 0.9°

Mar

1813° / 2.4°

Apr

4016° / 4.2°

May

6419.9° / 7.5°

Jun

8422.7° / 10.2°

Jul

8527.1° / 12.4°

Aug

8327.6° / 12.4°

Sep

8724.3° / 9.7°

Oct

4717.3° / 5.9°

Nov

911.3° / 2.6°

Dec

57.5° / 0.7°

Monthly climate evidence for Chapman Landing — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8°C	0.8°C	154 mm	16.5	9 h 02	5	Good coverage
February	10.2°C	0.9°C	112 mm	13.4	10 h 17	9	Good coverage
March	13°C	2.4°C	118 mm	15.3	11 h 46	18	Good coverage
April	16°C	4.2°C	73 mm	13	13 h 27	40	Good coverage
May	19.9°C	7.5°C	57 mm	9.7	14 h 54	64	Good coverage
June	22.7°C	10.2°C	34 mm	6.7	15 h 41	84	Good coverage
July	27.1°C	12.4°C	8 mm	1.9	15 h 23	85	Good coverage
August	27.6°C	12.4°C	13 mm	2.4	14 h 08	83	Good coverage
September	24.3°C	9.7°C	39 mm	5.7	12 h 29	87	Good coverage
October	17.3°C	5.9°C	90 mm	10.8	10 h 51	47	Good coverage
November	11.3°C	2.6°C	147 mm	15.3	9 h 24	9	Good coverage
December	7.5°C	0.7°C	176 mm	16.2	8 h 41	5	Good coverage

Records at SCAPPOOSE IND AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C18 Jan 2005	-12.7°C14 Jan 2017	54 mm12 Jan 2021	372 mm2006 · driest 49 mm in 2025	28
February	20.0°C11 Feb 2022	-9.9°C24 Feb 2023	59 mm28 Feb 2022	342 mm1999 · driest 33 mm in 2005	28
March	26.1°C25 Mar 2025	-5.5°C5 Mar 2019	49 mm5 Mar 2014	251 mm2012 · driest 29 mm in 2019	28
April	31.7°C28 Apr 2023	-2.7°C7 Apr 2012	34 mm12 Apr 2003	149 mm2003 · driest 10 mm in 2021	28
May	35.6°C16 May 2008	-0.5°C10 May 2012	28 mm3 May 2012	147 mm2005 · driest 1 mm in 2018	28
June	46.7°C28 Jun 2021	2.8°C6 Jun 2012	27 mm6 Jun 2010	78 mm2010 · driest 4 mm in 2003	27
July	41.7°C29 Jul 2009	6.1°C22 Jul 2011	12 mm23 Jul 2014	30 mm2011 · driest 0 mm in 2013	27
August	42.2°C12 Aug 2021	5.6°C29 Aug 2010	20 mm22 Aug 2004	54 mm2004 · driest 0 mm in 2017	26
September	37.2°C2 Sep 2017	0.6°C27 Sep 1999	58 mm18 Sep 2021	181 mm2013 · driest 0 mm in 2012	28
October	32.2°C2 Oct 2022	-7.2°C31 Oct 2002	69 mm13 Oct 2016	271 mm2016 · driest 12 mm in 2002	28
November	22.8°C3 Nov 2010	-9.9°C24 Nov 2010	79 mm4 Nov 2022	363 mm2006 · driest 14 mm in 2019	27
December	17.8°C4 Dec 2007	-14.9°C8 Dec 2013	81 mm2 Dec 2007	351 mm2015 · driest 34 mm in 2013	28

Typical days per month at SCAPPOOSE IND AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	13	5
February	0	0	13	3
March	<1	0	8	4
April	2	<1	3	2
May	5	1	<1	2
June	9	3	0	<1
July	21	9	0	0
August	22	10	0	<1
September	12	4	0	1
October	1	<1	2	3
November	0	0	9	5
December	0	0	13	6

How often, not how much — every day in SCAPPOOSE IND AP’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	51%	17%	66%	6.3–9.9°C
February	<1%	46%	11%	61%	7.8–12.1°C
March	6%	48%	11%	66%	11.0–15.2°C
April	21%	41%	6%	58%	14.0–18.4°C
May	43%	30%	4%	36%	17.6–21.9°C
June	65%	21%	3%	23%	20.2–24.8°C
July	92%	5%	<1%	2%	25.0–29.9°C
August	92%	7%	<1%	6%	26.1–30.1°C
September	75%	18%	4%	22%	22.5–26.2°C
October	25%	35%	9%	49%	16.2–19.2°C
November	<1%	51%	17%	67%	9.9–12.9°C
December	0%	53%	20%	71%	5.0–9.7°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1999Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2015. Coolest: 2011.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5718726
NOAA station: USW00004201 · SCAPPOOSE IND AP
Station distance: 3.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 45.75°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from SCAPPOOSE IND AP is what differs

Scappoose→Ridgefield→Burlington→Holbrook→Johnson Crossing→Riverview (historical)→

Or put two places side by side: Chapman Landing vs Scappoose

Best time to visitChapman Landing.