Canada · 1991–2020

Best time to visit
Rapid City.

August leads for comfortable weather in Rapid City: typically 24.9°C by day, 10.4°C at night, with 56 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high24.9°C

Typical low10.4°C

Rain in August56 mm

Comfort

August

August · July · June

82climate match

Beach

July

July · August · June

50climate match

Outdoors

September

September · August · June

86climate match

The weakest month is January, scoring 5 against August’s 82 — days reach only -11.7°C, 36° 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

5-11.7° / -22.3°

Feb

5-8.1° / -19.1°

Mar

5-1.2° / -11.8°

Apr

2210.3° / -2.4°

May

4717.2° / 3.3°

Jun

6922.1° / 9.6°

Jul

8124.9° / 11.9°

Aug

8224.9° / 10.4°

Sep

6419.5° / 4.8°

Oct

2210.3° / -2.1°

Nov

5-0.4° / -10.5°

Dec

5-8.6° / -18.5°

Monthly climate evidence for Rapid City — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-11.7°C	-22.3°C	18 mm	5.6	8 h 30	5	Good coverage
February	-8.1°C	-19.1°C	14 mm	3.3	9 h 59	5	Good coverage
March	-1.2°C	-11.8°C	25 mm	4.6	11 h 42	5	Good coverage
April	10.3°C	-2.4°C	27 mm	4.9	13 h 41	22	Good coverage
May	17.2°C	3.3°C	68 mm	8.4	15 h 24	47	Good coverage
June	22.1°C	9.6°C	90 mm	10.7	16 h 21	69	Good coverage
July	24.9°C	11.9°C	72 mm	8.2	15 h 58	81	Good coverage
August	24.9°C	10.4°C	56 mm	7.3	14 h 29	82	Good coverage
September	19.5°C	4.8°C	38 mm	5.6	12 h 33	64	Good coverage
October	10.3°C	-2.1°C	32 mm	4.7	10 h 38	22	Good coverage
November	-0.4°C	-10.5°C	21 mm	4.7	8 h 56	5	Good coverage
December	-8.6°C	-18.5°C	24 mm	6.1	8 h 05	5	Good coverage

Records at BRANDON A, 1941–2012
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	7.3°C5 Jan 2012	-45.6°C7 Jan 1966	22 mm1 Jan 1960	44 mm1969 · driest 3 mm in 1973	66
February	13.4°C27 Feb 1988	-41.7°C18 Feb 1966	35 mm26 Feb 1969	63 mm1969 · driest 1 mm in 1971	66
March	22.6°C19 Mar 2012	-41.7°C1 Mar 1962	31 mm28 Mar 1956	70 mm1953 · driest 3 mm in 1977	67
April	35.1°C21 Apr 1980	-26.5°C6 Apr 1979	37 mm27 Apr 1975	107 mm1975 · driest 0 mm in 1980	67
May	37.5°C22 May 1980	-12.3°C14 May 2004	86 mm6 May 1964	201 mm1999 · driest 1 mm in 1958	67
June	37.7°C13 Jun 1979	-3.9°C13 Jun 1969	80 mm2 Jun 1953	216 mm2005 · driest 7 mm in 1961	68
July	37.8°C20 Jul 1941	2.0°C5 Jul 1983	82 mm24 Jul 1973	155 mm1965 · driest 6 mm in 1951	68
August	38.5°C6 Aug 1988	-2.6°C27 Aug 1982	80 mm3 Aug 1985	217 mm1980 · driest 1 mm in 1961	70
September	36.7°C6 Sep 1976	-8.3°C28 Sep 1942	48 mm4 Sep 1941	111 mm1941 · driest 3 mm in 2012	69
October	30.9°C1 Oct 1992	-24.4°C31 Oct 1991	34 mm10 Oct 1959	145 mm1959 · driest 0 mm in 1952	68
November	20.6°C2 Nov 1978	-35.0°C20 Nov 1978	25 mm1 Nov 2000	71 mm2000 · driest 0 mm in 2009	67
December	10.0°C1 Dec 1969	-40.4°C23 Dec 1983	18 mm25 Dec 1942	81 mm1948 · driest 3 mm in 1954	67

Typical days per month at BRANDON A, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	12
February	0	0	28	<1	9
March	0	0	30	<1	8
April	<1	0	21	<1	4
May	3	<1	8	3	1
June	9	1	<1	3	0
July	15	3	0	2	0
August	16	4	0	2	0
September	6	<1	4	1	0
October	<1	<1	21	1	2
November	0	0	29	<1	7
December	0	0	30	<1	11

How often, not how much — every day in BRANDON A’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%	17%	<1%	14%	-17.9–-6.8°C
February	0%	15%	<1%	11%	-12.8–-4.3°C
March	<1%	15%	2%	10%	-6.3–3.3°C
April	9%	16%	3%	16%	4.7–14.2°C
May	33%	24%	6%	26%	14.7–20.5°C
June	52%	31%	9%	38%	20.1–25.0°C
July	70%	26%	7%	28%	23.3–27.7°C
August	68%	24%	6%	26%	22.1–27.1°C
September	38%	19%	5%	17%	16.1–21.2°C
October	11%	13%	2%	8%	8.3–14.2°C
November	<1%	16%	1%	14%	-4.9–4.3°C
December	0%	18%	1%	15%	-14.0–-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.

1942Each stripe is one year’s mean temperature against the 58-year average. Warmest: 1987. Coolest: 1996.2011

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 6116615
NOAA station: CA005010480 · BRANDON A
Station distance: 23.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 50.12°, 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 BRANDON A is what differs

Rivers→Carnegie→Douglas Station→Levine→Pendennis→Tremaine→

Or put two places side by side: Rapid City vs Rivers

Best time to visitRapid City.