United States · 1991–2020

Best time to visit
Gresham.

September leads for comfortable weather in Gresham: typically 24.4°C by day, 11°C at night, with 46 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.4°C

Typical low11°C

Rain in September46 mm

Comfort

September

September · June · July

88climate match

Beach

July

July · August · September

76climate match

Outdoors

May

May · September · June

82climate match

The weakest month is January, scoring 5 against September’s 88 — days reach only 7.9°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

57.9° / 2.6°

Feb

159.9° / 2.8°

Mar

2213.2° / 4.1°

Apr

4216.4° / 5.9°

May

6520.3° / 8.9°

Jun

8523.3° / 11.5°

Jul

8527.7° / 13.6°

Aug

8428° / 13.6°

Sep

8824.4° / 11°

Oct

4917.6° / 7.8°

Nov

1511.5° / 5.2°

Dec

57.5° / 2.5°

Monthly climate evidence for Gresham — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	7.9°C	2.6°C	129 mm	15.7	9 h 04	5	Good coverage
February	9.9°C	2.8°C	90 mm	12.9	10 h 18	15	Good coverage
March	13.2°C	4.1°C	116 mm	15.9	11 h 46	22	Good coverage
April	16.4°C	5.9°C	84 mm	13.7	13 h 27	42	Good coverage
May	20.3°C	8.9°C	68 mm	10.6	14 h 52	65	Good coverage
June	23.3°C	11.5°C	54 mm	7.3	15 h 39	85	Good coverage
July	27.7°C	13.6°C	11 mm	2.6	15 h 21	85	Good coverage
August	28°C	13.6°C	16 mm	2.4	14 h 06	84	Good coverage
September	24.4°C	11°C	46 mm	5.1	12 h 28	88	Good coverage
October	17.6°C	7.8°C	100 mm	11.6	10 h 51	49	Good coverage
November	11.5°C	5.2°C	143 mm	15.8	9 h 26	15	Good coverage
December	7.5°C	2.5°C	142 mm	15.6	8 h 43	5	Good coverage

Records at PORTLAND TROUTDALE AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C18 Jan 2005	-9.9°C13 Jan 2024	65 mm1 Jan 2009	269 mm2006 · driest 54 mm in 2005	28
February	18.9°C22 Feb 2002	-7.7°C20 Feb 2006	52 mm5 Feb 2017	222 mm1999 · driest 31 mm in 2013	28
March	25.6°C26 Mar 2025	-3.3°C1 Mar 2002	46 mm12 Mar 2026	203 mm2012 · driest 43 mm in 2019	28
April	31.1°C19 Apr 2016	-2.7°C2 Apr 2008	34 mm7 Apr 2018	163 mm2022 · driest 12 mm in 2021	28
May	35.6°C22 May 2001	1.1°C2 May 2006	33 mm27 May 2013	141 mm2005 · driest 11 mm in 2018	28
June	46.7°C28 Jun 2021	4.4°C14 Jun 2025	54 mm10 Jun 2022	135 mm2010 · driest 10 mm in 2003	28
July	40.6°C9 Jul 2024	7.2°C24 Jul 2008	17 mm22 Jul 2014	27 mm2014 · driest 0 mm in 2021	29
August	43.3°C14 Aug 2023	6.7°C31 Aug 2006	41 mm29 Aug 2005	84 mm2004 · driest 0 mm in 1998	28
September	36.7°C11 Sep 2013	2.8°C27 Sep 1999	53 mm30 Sep 2005	105 mm2013 · driest 2 mm in 2012	28
October	31.1°C2 Oct 2022	-1.6°C28 Oct 2019	62 mm31 Oct 2015	287 mm2016 · driest 25 mm in 2002	28
November	21.7°C13 Nov 1999	-9.3°C24 Nov 2010	50 mm19 Nov 2012	330 mm2006 · driest 41 mm in 2019	28
December	20.6°C4 Dec 2023	-10.5°C9 Dec 2013	61 mm7 Dec 2015	280 mm2015 · driest 33 mm in 2008	28

Typical days per month at PORTLAND TROUTDALE AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	7	4
February	0	0	6	3
March	0	0	4	4
April	2	<1	<1	2
May	6	2	0	2
June	11	4	0	2
July	23	10	0	<1
August	23	11	0	<1
September	13	4	0	1
October	1	0	<1	3
November	0	0	3	5
December	0	0	7	5

How often, not how much — every day in PORTLAND TROUTDALE 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%	50%	14%	65%	5.8–10.0°C
February	0%	46%	10%	62%	8.2–11.6°C
March	6%	51%	11%	70%	11.1–15.1°C
April	21%	44%	8%	60%	14.6–18.7°C
May	45%	33%	6%	41%	18.0–22.4°C
June	68%	23%	5%	25%	20.8–25.7°C
July	91%	7%	<1%	3%	25.8–30.6°C
August	92%	7%	1%	5%	26.6–30.8°C
September	77%	18%	5%	22%	22.7–26.1°C
October	25%	37%	11%	54%	16.3–19.6°C
November	<1%	53%	17%	72%	10.0–13.3°C
December	0%	51%	17%	69%	5.8–9.5°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 5729485
NOAA station: USW00024242 · PORTLAND TROUTDALE AP
Station distance: 6.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 45.50°, 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 PORTLAND TROUTDALE AP is what differs

Fairview→Wood Village→Boring→Hillsview→Interlachen→Powell Valley→

Or put two places side by side: Gresham vs Fairview

Best time to visitGresham.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Gresham.

The whole year,
without the guesswork.

Nearby, measured,
and named.