United States · 1991–2020

Best time to visit
Isle of Palms.

April leads for comfortable weather in Isle of Palms: typically 23.9°C by day, 13°C at night, with 76 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortApril

Typical high23.9°C

Typical low13°C

Rain in April76 mm

Comfort

April

April · October · May

88climate match

Beach

May

May · September · June

80climate match

Outdoors

November

November · March · April

87climate match

The weakest month is July, scoring 33 against April’s 88 — days average 32.7°C, 9° above 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

3915.3° / 3.9°

Feb

4816.6° / 5.3°

Mar

6319.8° / 8.5°

Apr

8823.9° / 13°

May

7527.9° / 18°

Jun

4731° / 21.8°

Jul

3332.7° / 23.5°

Aug

3632° / 23.1°

Sep

5629.9° / 20.7°

Oct

8325.8° / 14.9°

Nov

7120.7° / 9.4°

Dec

4917.1° / 5.9°

Monthly climate evidence for Isle of Palms — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 19 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	15.3°C	3.9°C	92 mm	7.8	16.5°C	10 h 12	39	Strong coverage
February	16.6°C	5.3°C	82 mm	6.8	15.4°C	10 h 58	48	Strong coverage
March	19.8°C	8.5°C	88 mm	7.2	16.5°C	11 h 53	63	Strong coverage
April	23.9°C	13°C	76 mm	5.7	18.9°C	12 h 57	88	Strong coverage
May	27.9°C	18°C	65 mm	5.6	22.8°C	13 h 49	75	Strong coverage
June	31°C	21.8°C	124 mm	8.2	26.3°C	14 h 18	47	Strong coverage
July	32.7°C	23.5°C	154 mm	10.5	28.1°C	14 h 07	33	Strong coverage
August	32°C	23.1°C	160 mm	9.6	28.2°C	13 h 21	36	Strong coverage
September	29.9°C	20.7°C	112 mm	7.3	27.0°C	12 h 20	56	Strong coverage
October	25.8°C	14.9°C	91 mm	6.5	23.9°C	11 h 19	83	Strong coverage
November	20.7°C	9.4°C	72 mm	6	20.4°C	10 h 26	71	Strong coverage
December	17.1°C	5.9°C	92 mm	7.1	18.5°C	10 h 00	49	Strong coverage

What has changed

Isle of Palms runs +0.8°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

+1.2

Feb

+1.8

Mar

+0.7

Apr

+1.1

May

+0.7

Jun

+0.9

Jul

+0.9

Aug

+0.4

Sep

+0.8

Oct

+0.8

Nov

-0.8

Dec

+0.8

April daytime highs, 2011–2025. Last recorded: 21.9°C.

Records at SULLIVANS IS, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C12 Jan 1974	-12.8°C21 Jan 1985	104 mm30 Jan 2010	221 mm1987 · driest 11 mm in 2022	73
February	28.3°C24 Feb 2023	-11.1°C12 Feb 1973	153 mm17 Feb 1998	210 mm1998 · driest 11 mm in 1991	73
March	32.2°C10 Mar 1974	-7.8°C15 Mar 1998	102 mm23 Mar 2005	240 mm1965 · driest 13 mm in 2026	72
April	33.9°C30 Apr 2002	-5.0°C9 Apr 2009	118 mm9 Apr 1984	198 mm1982 · driest 0 mm in 1976	71
May	37.2°C26 May 1953	2.8°C30 May 1971	165 mm24 May 1976	364 mm1976 · driest 1 mm in 2021	72
June	40.6°C26 Jun 1952	9.4°C6 Jun 2006	133 mm6 Jun 1997	399 mm1962 · driest 6 mm in 1991	70
July	38.3°C9 Jul 2010	15.0°C12 Jul 1985	154 mm20 Jul 1953	454 mm1964 · driest 24 mm in 2021	73
August	39.4°C2 Aug 1999	12.8°C31 Aug 2010	166 mm22 Aug 2025	440 mm2025 · driest 4 mm in 1954	69
September	37.2°C10 Sep 2010	7.8°C22 Sep 2008	119 mm26 Sep 2002	320 mm2014 · driest 7 mm in 2018	67
October	34.4°C4 Oct 1986	-5.6°C29 Oct 2008	250 mm11 Oct 1990	363 mm1990 · driest 0 mm in 2016	71
November	31.7°C3 Nov 1992	-5.6°C25 Nov 1970	192 mm1 Nov 1969	259 mm1969 · driest 2 mm in 2005	72
December	28.9°C10 Dec 1987	-11.7°C20 Dec 2000	99 mm3 Dec 1971	244 mm2018 · driest 16 mm in 2004	73

Typical days per month at SULLIVANS IS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	<1	0	7	3
February	<1	0	4	2
March	3	<1	1	3
April	12	<1	<1	2
May	25	7	0	2
June	26	19	0	3
July	28	26	0	4
August	27	24	0	4
September	26	15	0	3
October	18	3	0	3
November	4	<1	<1	2
December	<1	0	4	2

How often, not how much — every day in SULLIVANS IS’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	11%	25%	10%	26%	11.9–17.7°C
February	17%	25%	10%	27%	12.7–18.4°C
March	38%	24%	10%	23%	16.6–21.5°C
April	70%	19%	7%	15%	21.8–25.4°C
May	79%	20%	8%	20%	25.8–28.9°C
June	73%	27%	11%	31%	28.7–32.7°C
July	68%	32%	14%	41%	30.7–33.4°C
August	68%	32%	15%	36%	30.2–32.8°C
September	75%	25%	11%	25%	27.9–30.6°C
October	75%	18%	8%	17%	23.4–26.7°C
November	46%	19%	7%	16%	18.4–22.7°C
December	19%	23%	8%	25%	13.6–19.4°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.

1952Each stripe is one year’s mean temperature against the 53-year average. Warmest: 1990. Coolest: 1988.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4583114
NOAA station: USC00388405 · SULLIVANS IS
Station distance: 6.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 32.79°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 19 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 SULLIVANS IS is what differs

Mount Pleasant→Sullivans Island→Avian Park→Brook Green Meadow→Cainhoy→Cassina Heights→

Or put two places side by side: Isle of Palms vs Mount Pleasant

Best time to visitIsle of Palms.

April

May

November

The whole year,without the guesswork.

Isle of Palms runs +0.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Isle of Palms.

The whole year,
without the guesswork.

Isle of Palms runs +0.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.