United States · 1991–2020

Best time to visit
Three Rivers.

September leads for comfortable weather in Three Rivers: typically 24.2°C by day, 0.7°C at night, with 18 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.2°C

Typical low0.7°C

Rain in September18 mm

Comfort

September

September · June · July

74climate match

Beach

July

July · August · June

56climate match

Outdoors

June

June · May · September

80climate match

The weakest month is January, scoring 5 against September’s 74 — days reach only 3.6°C, 20° 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

53.6° / -6.8°

Feb

55.7° / -6.4°

Mar

119.5° / -4.5°

Apr

2913.5° / -3.1°

May

5017.8° / 0.2°

Jun

7322.5° / 3.2°

Jul

6629° / 5.3°

Aug

6628.5° / 4.6°

Sep

7424.2° / 0.7°

Oct

4016.4° / -2.6°

Nov

58° / -4.3°

Dec

53° / -7.5°

Monthly climate evidence for Three Rivers — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.6°C	-6.8°C	70 mm	10.6	9 h 15	5	Good coverage
February	5.7°C	-6.4°C	48 mm	8.7	10 h 24	5	Good coverage
March	9.5°C	-4.5°C	38 mm	9	11 h 47	11	Good coverage
April	13.5°C	-3.1°C	29 mm	7.1	13 h 22	29	Good coverage
May	17.8°C	0.2°C	36 mm	6.4	14 h 42	50	Good coverage
June	22.5°C	3.2°C	21 mm	3.8	15 h 26	73	Good coverage
July	29°C	5.3°C	10 mm	1.8	15 h 09	66	Good coverage
August	28.5°C	4.6°C	14 mm	2.4	13 h 59	66	Good coverage
September	24.2°C	0.7°C	18 mm	2.9	12 h 27	74	Good coverage
October	16.4°C	-2.6°C	37 mm	5.8	10 h 56	40	Good coverage
November	8°C	-4.3°C	60 mm	8.6	9 h 35	5	Good coverage
December	3°C	-7.5°C	82 mm	11.5	8 h 56	5	Good coverage

Records at SUNRIVER, 1998–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C30 Jan 2024	-26.1°C22 Jan 2008	58 mm10 Jan 2024	158 mm2024 · driest 7 mm in 2018	23
February	17.2°C11 Feb 2022	-26.7°C26 Feb 2011	36 mm12 Feb 2014	202 mm2014 · driest 4 mm in 2022	22
March	25.6°C28 Mar 2015	-19.4°C1 Mar 2019	23 mm26 Mar 2003	99 mm2012 · driest 11 mm in 2007	23
April	28.9°C23 Apr 2012	-12.2°C1 Apr 2008	39 mm8 Apr 2019	79 mm2019 · driest 1 mm in 2021	22
May	33.9°C24 May 2001	-11.7°C2 May 2003	38 mm22 May 2013	106 mm1998 · driest 5 mm in 2002	25
June	38.3°C29 Jun 2021	-8.9°C11 Jun 2005	21 mm10 Jun 2004	77 mm2006 · driest 0 mm in 2003	26
July	38.9°C23 Jul 2003	-7.2°C2 Jul 2005	18 mm12 Jul 2001	46 mm1998 · driest 0 mm in 2013	25
August	38.3°C17 Aug 2008	-4.4°C31 Aug 2008	24 mm15 Aug 2004	83 mm2004 · driest 0 mm in 2011	25
September	38.9°C3 Sep 2017	-11.1°C18 Sep 2005	33 mm30 Sep 2013	90 mm2013 · driest 0 mm in 2009	25
October	31.7°C2 Oct 2020	-22.2°C31 Oct 2002	56 mm19 Oct 2007	133 mm2016 · driest 0 mm in 2020	25
November	22.2°C3 Nov 2020	-21.1°C29 Nov 2006	45 mm21 Nov 1998	140 mm1998 · driest 8 mm in 2019	24
December	17.8°C2 Dec 2021	-32.8°C8 Dec 2013	58 mm7 Dec 2013	168 mm2005 · driest 7 mm in 2017	25

Typical days per month at SUNRIVER, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	2	8
February	0	0	26	1	7
March	<1	0	28	<1	5
April	2	0	25	<1	3
May	4	<1	16	<1	<1
June	11	2	6	<1	0
July	25	14	2	<1	0
August	24	13	3	<1	0
September	14	6	14	<1	0
October	3	<1	24	1	<1
November	0	0	25	1	5
December	0	0	28	2	9

How often, not how much — every day in SUNRIVER’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%	35%	7%	46%	2.5–5.3°C
February	0%	30%	4%	35%	3.9–7.9°C
March	5%	28%	2%	31%	6.5–12.2°C
April	18%	22%	<1%	24%	10.8–16.4°C
May	36%	20%	3%	21%	14.9–20.0°C
June	66%	13%	2%	11%	19.5–25.3°C
July	92%	6%	<1%	<1%	26.9–31.7°C
August	90%	8%	<1%	4%	26.9–30.1°C
September	73%	9%	2%	8%	22.1–25.9°C
October	32%	19%	3%	21%	14.0–19.9°C
November	2%	28%	5%	37%	5.8–10.2°C
December	0%	38%	8%	53%	1.4–5.0°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.

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5756628
NOAA station: USC00358246 · SUNRIVER
Station distance: 7.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 18 usable years
Daylight: Calculated from latitude 43.82°, 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 SUNRIVER is what differs

Sunriver→

Or put two places side by side: Three Rivers vs Sunriver

Best time to visitThree Rivers.