United States · 1991–2020

Best time to visit
Irrigon.

May leads for comfortable weather in Irrigon: typically 23.7°C by day, 7.7°C at night, with 24 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.7°C

Typical low7.7°C

Rain in May24 mm

Comfort

May

May · June · September

84climate match

Beach

July

July · June · August

69climate match

Outdoors

April

April · May · October

83climate match

The weakest month is January, scoring 5 against May’s 84 — days reach only 5.7°C, 18° 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

55.7° / -2.8°

Feb

158.9° / -3.1°

Mar

4014.8° / 0°

Apr

6119° / 3.3°

May

8423.7° / 7.7°

Jun

8127.6° / 11.3°

Jul

7032.5° / 13.7°

Aug

6932° / 12.7°

Sep

7826.7° / 7.9°

Oct

5918.8° / 2.7°

Nov

2410.5° / -1.3°

Dec

55.2° / -3.2°

Monthly climate evidence for Irrigon — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.7°C	-2.8°C	30 mm	6.6	9 h 01	5	Good coverage
February	8.9°C	-3.1°C	23 mm	6.1	10 h 17	15	Good coverage
March	14.8°C	0°C	21 mm	6.3	11 h 45	40	Good coverage
April	19°C	3.3°C	19 mm	4.8	13 h 28	61	Good coverage
May	23.7°C	7.7°C	24 mm	5.1	14 h 55	84	Good coverage
June	27.6°C	11.3°C	15 mm	3.3	15 h 43	81	Good coverage
July	32.5°C	13.7°C	3 mm	0.5	15 h 24	70	Good coverage
August	32°C	12.7°C	5 mm	1.1	14 h 08	69	Good coverage
September	26.7°C	7.9°C	8 mm	2.1	12 h 29	78	Good coverage
October	18.8°C	2.7°C	22 mm	4.8	10 h 50	59	Good coverage
November	10.5°C	-1.3°C	23 mm	5.8	9 h 24	24	Good coverage
December	5.2°C	-3.2°C	33 mm	8	8 h 40	5	Good coverage

Records at HERMISTON 2 NW, 1999–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C13 Jan 2021	-24.4°C5 Jan 2004	29 mm22 Jan 2000	64 mm2000 · driest 7 mm in 2002	27
February	20.6°C11 Feb 2022	-20.6°C23 Feb 2022	23 mm7 Feb 2025	68 mm2025 · driest 3 mm in 2005	25
March	28.9°C28 Mar 2015	-17.2°C5 Mar 2019	14 mm22 Mar 2012	43 mm2011 · driest 2 mm in 2021	27
April	33.3°C30 Apr 2023	-6.7°C1 Apr 2008	16 mm25 Apr 2005	38 mm2018 · driest 1 mm in 2021	27
May	38.3°C31 May 2015	-3.3°C11 May 2022	33 mm13 May 2015	72 mm2022 · driest 3 mm in 2023	26
June	47.2°C30 Jun 2021	-1.7°C10 Jun 2018	22 mm5 Jun 2007	48 mm2012 · driest 0 mm in 2003	27
July	46.1°C17 Jul 2014	0.6°C5 Jul 2018	13 mm14 Jul 2012	21 mm2012 · driest 0 mm in 2003	27
August	43.9°C5 Aug 2014	-1.1°C6 Aug 2018	19 mm14 Aug 2014	27 mm2014 · driest 0 mm in 2020	26
September	39.4°C4 Sep 2020	-1.7°C24 Sep 2000	16 mm16 Sep 2013	49 mm2013 · driest 0 mm in 2018	26
October	35.0°C7 Oct 2014	-12.2°C31 Oct 2002	23 mm22 Oct 2022	54 mm2016 · driest 1 mm in 2013	25
November	24.4°C6 Nov 2014	-16.7°C24 Nov 2010	16 mm6 Nov 2020	48 mm2025 · driest 6 mm in 2019	26
December	23.9°C12 Dec 2014	-23.3°C16 Dec 2008	31 mm29 Dec 2010	75 mm2010 · driest 4 mm in 2011	27

Typical days per month at HERMISTON 2 NW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	23	<1	1
February	0	0	21	<1	2
March	<1	0	16	<1	<1
April	3	<1	6	<1	0
May	11	4	1	<1	0
June	20	10	0	<1	0
July	30	22	0	0	0
August	29	22	0	0	0
September	19	8	<1	<1	0
October	3	<1	9	<1	0
November	0	0	19	<1	<1
December	0	0	24	<1	2

How often, not how much — every day in HERMISTON 2 NW’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%	21%	2%	20%	3.2–8.8°C
February	<1%	21%	1%	19%	7.2–11.9°C
March	12%	19%	<1%	16%	12.6–17.7°C
April	38%	15%	1%	15%	17.2–21.3°C
May	70%	15%	2%	13%	21.5–26.0°C
June	88%	10%	<1%	5%	25.5–31.5°C
July	98%	2%	<1%	0%	30.7–35.9°C
August	97%	3%	<1%	<1%	30.7–34.0°C
September	90%	7%	<1%	4%	25.3–29.3°C
October	40%	15%	1%	11%	17.4–22.0°C
November	4%	21%	2%	21%	9.2–12.8°C
December	<1%	27%	2%	33%	2.5–8.6°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.

2000Each stripe is one year’s mean temperature against the 23-year average. Warmest: 2025. Coolest: 2019.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5733120
NOAA station: USC00353818 · HERMISTON 2 NW
Station distance: 14.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 45.90°, 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 HERMISTON 2 NW is what differs

Charlestown→Ordnance (historical)→

Or put two places side by side: Irrigon vs Charlestown

Best time to visitIrrigon.

May

July

April

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Irrigon.

The whole year,
without the guesswork.

Nearby, measured,
and named.