United States · 1991–2020

Best time to visit
Bozeman.

September leads for comfortable weather in Bozeman: typically 22.6°C by day, 5.8°C at night, with 37 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high22.6°C

Typical low5.8°C

Rain in September37 mm

Comfort

September

September · July · August

76climate match

Beach

July

July · August · September

67climate match

Outdoors

September

September · August · June

80climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only 1.9°C, 22° 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

51.9° / -9.3°

Feb

53.3° / -8.4°

Mar

98.5° / -4.4°

Apr

2613.2° / -0.7°

May

4818° / 3.9°

Jun

6922.8° / 7.7°

Jul

7528.5° / 11.1°

Aug

7528.1° / 10.1°

Sep

7622.6° / 5.8°

Oct

3714.6° / 0.3°

Nov

56.3° / -5.4°

Dec

51.4° / -9.7°

Monthly climate evidence for Bozeman — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.9°C	-9.3°C	22 mm	6	9 h 03	5	Strong coverage
February	3.3°C	-8.4°C	21 mm	5.2	10 h 17	5	Strong coverage
March	8.5°C	-4.4°C	35 mm	8.2	11 h 46	9	Strong coverage
April	13.2°C	-0.7°C	64 mm	10.1	13 h 27	26	Strong coverage
May	18°C	3.9°C	74 mm	11	14 h 53	48	Strong coverage
June	22.8°C	7.7°C	83 mm	11.3	15 h 41	69	Strong coverage
July	28.5°C	11.1°C	33 mm	6.4	15 h 22	75	Strong coverage
August	28.1°C	10.1°C	34 mm	6.5	14 h 07	75	Strong coverage
September	22.6°C	5.8°C	37 mm	6.4	12 h 29	76	Strong coverage
October	14.6°C	0.3°C	47 mm	7.2	10 h 51	37	Strong coverage
November	6.3°C	-5.4°C	32 mm	6.2	9 h 25	5	Strong coverage
December	1.4°C	-9.7°C	27 mm	6.3	8 h 42	5	Strong coverage

What has changed

Bozeman runs +0.6°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

+1.3

Feb

-2.0

Mar

+1.4

Apr

+0.4

May

-0.2

Jun

+0.6

Jul

+1.0

Aug

+0.7

Sep

+2.3

Oct

-0.3

Nov

+1.0

Dec

+1.2

September daytime highs, 2011–2025. Last recorded: 26.1°C.

Records at BOZEMAN MONTANA STATE UNIV, 1892–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.3°C8 Jan 1896	-40.0°C13 Jan 2024	20 mm28 Jan 1942	55 mm1942 · driest 3 mm in 1961	132
February	18.3°C5 Feb 2026	-41.7°C8 Feb 1936	22 mm16 Feb 1942	62 mm2003 · driest 1 mm in 1973	132
March	25.6°C20 Mar 2026	-33.9°C4 Mar 2019	31 mm11 Mar 1991	91 mm1938 · driest 1 mm in 1911	132
April	28.3°C26 Apr 1897	-23.3°C1 Apr 1936	41 mm6 Apr 2006	119 mm2009 · driest 5 mm in 1934	134
May	32.8°C22 May 1892	-8.9°C1 May 1954	68 mm7 May 1988	243 mm1908 · driest 9 mm in 1897	134
June	35.6°C30 Jun 1990	-3.3°C3 Jun 1951	58 mm13 Jun 2001	203 mm1944 · driest 2 mm in 1919	133
July	40.6°C31 Jul 1892	0.0°C14 Jul 1913	52 mm3 Jul 1993	126 mm1993 · driest 2 mm in 1936	132
August	37.8°C11 Aug 2018	-3.3°C25 Aug 1910	35 mm20 Aug 2021	97 mm1964 · driest 1 mm in 2001	130
September	37.2°C3 Sep 2022	-11.1°C24 Sep 1926	43 mm10 Sep 1947	141 mm1909 · driest 2 mm in 1904	130
October	31.1°C1 Oct 1992	-23.3°C30 Oct 1935	42 mm15 Oct 1935	113 mm1951 · driest 2 mm in 1902	131
November	22.8°C12 Nov 1999	-32.2°C16 Nov 1959	41 mm12 Nov 2009	83 mm1947 · driest 0 mm in 1894	131
December	17.8°C1 Dec 2021	-39.4°C22 Dec 2022	32 mm26 Dec 2008	72 mm2008 · driest 3 mm in 1986	131

Typical days per month at BOZEMAN MONTANA STATE UNIV, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	9
February	0	0	26	<1	8
March	0	0	25	<1	8
April	<1	0	19	2	7
May	4	<1	6	2	2
June	11	3	<1	3	<1
July	26	12	0	<1	0
August	25	11	<1	<1	0
September	12	2	2	1	<1
October	2	<1	15	1	3
November	0	0	25	<1	7
December	0	0	29	<1	9

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 80); on 2011–2025 it is June (82). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in BOZEMAN MONTANA STATE UNIV’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%	18%	<1%	14%	-3.7–3.5°C
February	0%	17%	<1%	14%	-2.4–6.0°C
March	1%	23%	2%	22%	2.0–10.2°C
April	12%	28%	4%	34%	9.4–15.6°C
May	31%	33%	8%	44%	14.4–20.8°C
June	53%	34%	8%	41%	18.9–25.3°C
July	78%	20%	3%	17%	24.8–30.5°C
August	78%	19%	3%	17%	24.6–29.2°C
September	56%	21%	5%	24%	17.1–24.2°C
October	21%	20%	4%	19%	10.2–17.3°C
November	<1%	20%	2%	16%	2.1–9.2°C
December	0%	18%	1%	15%	-2.3–4.3°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.

1895Each stripe is one year’s mean temperature against the 125-year average. Warmest: 2025. Coolest: 1916.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5641727
NOAA station: USC00241044 · BOZEMAN MONTANA STATE UNIV
Station distance: 2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 45.68°, 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 BOZEMAN MONTANA STATE UNIV is what differs

Alpine Trailer Court→Balmont→Bisel→Bridger View Trailer Court→Canyon View Trailer Court→Catron→

Or put two places side by side: Bozeman vs Alpine Trailer Court

Best time to visitBozeman.

September

July

September

The whole year,without the guesswork.

Bozeman runs +0.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Bozeman.

The whole year,
without the guesswork.

Bozeman runs +0.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.