United States · 1991–2020

Best time to visit
Riverside.

August leads for comfortable weather in Riverside: typically 26.7°C by day, 2.3°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.7°C

Typical low2.3°C

Rain in August27 mm

Comfort

August

August · July · June

66climate match

Beach

July

July · August · June

47climate match

Outdoors

September

September · June · August

76climate match

The weakest month is January, scoring 5 against August’s 66 — days reach only -2.1°C, 26° below the 24°C the score treats as ideal, and nights drop to -16°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

5-2.1° / -16°

Feb

50.7° / -15.6°

Mar

56.5° / -11.1°

Apr

710.6° / -6.5°

May

3115.6° / -2.3°

Jun

6021.3° / 1.1°

Jul

6527.9° / 3.8°

Aug

6626.7° / 2.3°

Sep

5720.5° / -1.5°

Oct

1411° / -5.6°

Nov

53° / -11.2°

Dec

5-2.9° / -16.2°

Monthly climate evidence for Riverside — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2.1°C	-16°C	61 mm	12.2	9 h 10	5	Good coverage
February	0.7°C	-15.6°C	60 mm	11.7	10 h 21	5	Good coverage
March	6.5°C	-11.1°C	55 mm	10.5	11 h 46	5	Good coverage
April	10.6°C	-6.5°C	61 mm	10.3	13 h 24	7	Good coverage
May	15.6°C	-2.3°C	63 mm	9.8	14 h 47	31	Good coverage
June	21.3°C	1.1°C	50 mm	7.7	15 h 33	60	Good coverage
July	27.9°C	3.8°C	27 mm	5	15 h 15	65	Good coverage
August	26.7°C	2.3°C	27 mm	5	14 h 03	66	Good coverage
September	20.5°C	-1.5°C	33 mm	5	12 h 28	57	Good coverage
October	11°C	-5.6°C	48 mm	8	10 h 53	14	Good coverage
November	3°C	-11.2°C	62 mm	10.3	9 h 31	5	Good coverage
December	-2.9°C	-16.2°C	70 mm	12.3	8 h 50	5	Good coverage

Records at West Yellowstone, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	9.8°C30 Jan 2024	-42.9°C30 Jan 2023	25 mm19 Jan 2018	124 mm2008 · driest 18 mm in 2001	28
February	12.1°C14 Feb 2015	-44.3°C6 Feb 2014	28 mm25 Feb 2019	180 mm2019 · driest 15 mm in 2010	28
March	19.1°C27 Mar 2022	-36.7°C10 Mar 2022	23 mm17 Mar 2012	122 mm2014 · driest 10 mm in 2026	28
April	25.2°C23 Apr 2012	-26.6°C13 Apr 2022	33 mm16 Apr 2026	104 mm2003 · driest 18 mm in 2021	28
May	29.4°C28 May 2003	-13.8°C10 May 2022	38 mm15 May 2001	122 mm2011 · driest 8 mm in 2007	28
June	34.6°C27 Jun 2015	-6.6°C19 Jun 2024	51 mm12 Jun 2022	114 mm2010 · driest 0 mm in 2021	28
July	36.0°C13 Jul 2002	-3.8°C12 Jul 2008	33 mm10 Jul 2005	66 mm2004 · driest 8 mm in 2023	28
August	36.2°C14 Aug 2003	-5.7°C31 Aug 2005	51 mm2 Aug 2022	109 mm2014 · driest 3 mm in 2008	27
September	33.6°C3 Sep 2022	-15.0°C28 Sep 1999	25 mm27 Sep 2014	102 mm2017 · driest 3 mm in 2018	28
October	27.9°C3 Oct 2010	-30.4°C26 Oct 2020	41 mm22 Oct 2022	168 mm2016 · driest 13 mm in 1998	28
November	18.6°C7 Nov 1999	-33.3°C19 Nov 2022	28 mm3 Nov 2015	119 mm1998 · driest 20 mm in 2004	28
December	11.0°C12 Dec 2014	-45.0°C22 Dec 2022	31 mm22 Dec 2025	145 mm2025 · driest 35 mm in 2009	28

Typical days per month at West Yellowstone, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	30	1
February	0	0	28	2
March	0	0	30	2
April	0	0	29	2
May	2	0	24	2
June	9	1	12	2
July	25	10	3	<1
August	23	6	8	<1
September	8	<1	20	1
October	<1	0	28	2
November	0	0	29	2
December	0	0	31	2

How often, not how much — every day in West Yellowstone’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%	37%	4%	51%	-4.2–-0.1°C
February	0%	42%	5%	55%	-1.7–3.1°C
March	0%	33%	5%	42%	4.5–9.2°C
April	4%	32%	7%	37%	8.7–12.3°C
May	24%	30%	6%	38%	12.6–18.0°C
June	55%	24%	6%	26%	19.2–24.6°C
July	84%	14%	2%	11%	26.1–30.3°C
August	79%	18%	3%	13%	24.5–28.4°C
September	57%	17%	4%	19%	18.2–23.3°C
October	8%	27%	5%	32%	9.3–14.1°C
November	0%	34%	7%	46%	0.5–5.5°C
December	0%	41%	8%	57%	-4.6–-0.8°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 27-year average. Warmest: 2015. Coolest: 2002.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5674029
NOAA station: USS0011E07S · West Yellowstone
Station distance: 1.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 44.66°, 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 West Yellowstone is what differs

West Yellowstone→Hebgen Lake Estates→Horse Butte Acres Trailer Court→Lakeshore Summer Home Area→Lonesome Hurst Summer Home Area→Romsett Summer Home Area→

Or put two places side by side: Riverside vs West Yellowstone

Best time to visitRiverside.