United States · 1991–2020

Best time to visit
Hailey.

August leads for comfortable weather in Hailey: typically 26.3°C by day, 6°C at night, with 14 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.3°C

Typical low6°C

Rain in August14 mm

Comfort

August

August · July · June

76climate match

Beach

July

July · August · June

55climate match

Outdoors

June

June · September · August

84climate match

The weakest month is January, scoring 5 against August’s 76 — days reach only 0°C, 24° below the 24°C the score treats as ideal, and nights drop to -13.6°C.

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

50° / -13.6°

Feb

52.1° / -11.8°

Mar

56.3° / -7.6°

Apr

2411.5° / -3°

May

4716.9° / 1.1°

Jun

7021.3° / 4.2°

Jul

7527.1° / 7°

Aug

7626.3° / 6°

Sep

6621° / 2.1°

Oct

3313.7° / -2.6°

Nov

55.6° / -8.4°

Dec

5-0.6° / -12.9°

Monthly climate evidence for Hailey — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0°C	-13.6°C	57 mm	7.8	9 h 17	5	Strong coverage
February	2.1°C	-11.8°C	42 mm	6.5	10 h 25	5	Strong coverage
March	6.3°C	-7.6°C	51 mm	6.7	11 h 47	5	Strong coverage
April	11.5°C	-3°C	31 mm	5.4	13 h 21	24	Strong coverage
May	16.9°C	1.1°C	40 mm	6.9	14 h 40	47	Strong coverage
June	21.3°C	4.2°C	34 mm	5.1	15 h 24	70	Strong coverage
July	27.1°C	7°C	12 mm	2.9	15 h 07	75	Strong coverage
August	26.3°C	6°C	14 mm	3	13 h 58	76	Strong coverage
September	21°C	2.1°C	26 mm	3.9	12 h 27	66	Strong coverage
October	13.7°C	-2.6°C	36 mm	4.5	10 h 56	33	Strong coverage
November	5.6°C	-8.4°C	33 mm	5.4	9 h 37	5	Strong coverage
December	-0.6°C	-12.9°C	68 mm	9	8 h 58	5	Strong coverage

What has changed

Hailey runs -0.0°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+0.7

Feb

-0.5

Mar

-0.6

Apr

-0.8

May

-0.2

Jun

-0.1

Jul

+0.7

Aug

+0.4

Sep

+0.3

Oct

-1.2

Nov

+0.5

Dec

+0.3

August daytime highs, 2011–2025. Last recorded: 26.6°C.

Records at KETCHUM RS, 1973–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	12.2°C27 Jan 2015	-33.3°C20 Jan 2025	42 mm2 Jan 1997	129 mm1995 · driest 1 mm in 1984	53
February	15.0°C6 Feb 2026	-32.8°C5 Feb 1982	47 mm28 Feb 2006	129 mm1986 · driest 0 mm in 2016	52
March	22.2°C21 Mar 2026	-24.4°C5 Mar 1976	70 mm11 Mar 1995	177 mm1995 · driest 1 mm in 1994	52
April	26.1°C28 Apr 1987	-18.3°C5 Apr 1982	28 mm10 Apr 2006	143 mm2006 · driest 0 mm in 1977	53
May	31.7°C30 May 2003	-11.1°C10 May 1999	36 mm24 May 1976	145 mm2005 · driest 0 mm in 1974	53
June	36.1°C17 Jun 1974	-8.9°C7 Jun 2026	29 mm6 Jun 1993	134 mm2009 · driest 0 mm in 2026	54
July	36.7°C13 Jul 2002	-10.0°C3 Jul 2010	28 mm25 Jul 2006	65 mm1977 · driest 0 mm in 2009	54
August	35.6°C8 Aug 2001	-7.2°C26 Aug 1992	34 mm22 Aug 2014	80 mm1976 · driest 0 mm in 2012	53
September	32.2°C6 Sep 2020	-10.0°C24 Sep 2008	42 mm6 Sep 1978	119 mm1985 · driest 0 mm in 2021	52
October	27.8°C2 Oct 2010	-18.9°C31 Oct 1991	40 mm25 Oct 2010	84 mm2000 · driest 0 mm in 1978	52
November	20.0°C15 Nov 1999	-26.7°C25 Nov 1993	37 mm7 Nov 2022	155 mm1973 · driest 0 mm in 1976	53
December	15.0°C1 Dec 2008	-38.3°C22 Dec 1990	48 mm13 Dec 1995	177 mm1996 · driest 1 mm in 1989	53

Typical days per month at KETCHUM RS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	2	8
February	0	0	28	1	7
March	0	0	30	1	5
April	<1	0	24	<1	2
May	2	<1	12	1	<1
June	8	<1	4	1	0
July	23	8	1	<1	0
August	22	5	1	<1	0
September	7	<1	8	<1	0
October	<1	0	23	1	<1
November	0	0	27	<1	3
December	0	0	29	2	9

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 76); on 2011–2025 it is August (79). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in KETCHUM RS’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%	24%	5%	26%	-2.7–2.3°C
February	0%	25%	6%	30%	-0.3–4.4°C
March	<1%	23%	5%	24%	3.5–9.4°C
April	8%	19%	3%	19%	7.8–14.6°C
May	29%	23%	4%	29%	14.5–19.4°C
June	59%	17%	3%	18%	18.4–24.2°C
July	86%	11%	2%	10%	24.9–29.4°C
August	85%	11%	1%	6%	23.6–27.9°C
September	60%	14%	3%	11%	19.3–23.4°C
October	17%	14%	3%	11%	12.0–17.1°C
November	<1%	21%	5%	24%	2.8–8.5°C
December	0%	27%	6%	33%	-3.3–2.7°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.

1975Each stripe is one year’s mean temperature against the 43-year average. Warmest: 2015. Coolest: 1975.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5594956
NOAA station: USC00104845 · KETCHUM RS
Station distance: 18.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 43.52°, 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 KETCHUM RS is what differs

Ketchum→Sun Valley→Barite→Broadford→Bullion→Clarendon Hot Springs→

Or put two places side by side: Hailey vs Ketchum

Best time to visitHailey.