Canada · 1991–2020

Best time to visit
St. Thomas.

June leads for comfortable weather in St. Thomas: typically 25.1°C by day, 13.3°C at night, with 80 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high25.1°C

Typical low13.3°C

Rain in June80 mm

Comfort

June

June · August · July

82climate match

Beach

July

July · August · June

66climate match

Outdoors

May

May · September · June

79climate match

The weakest month is January, scoring 5 against June’s 82 — days reach only -0.3°C, 24° 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

5-0.3° / -8.2°

Feb

51° / -8°

Mar

55.9° / -3.6°

Apr

2513° / 1.9°

May

6120.2° / 8.1°

Jun

8225.1° / 13.3°

Jul

7627.2° / 15.8°

Aug

8226.2° / 14.9°

Sep

7622.4° / 11.1°

Oct

4015.5° / 5.7°

Nov

98.4° / 0.3°

Dec

52.8° / -4°

Monthly climate evidence for St. Thomas — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 17 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-0.3°C	-8.2°C	84 mm	12.5	1.8°C	9 h 21	5	Strong coverage
February	1°C	-8°C	61 mm	9.8	0.6°C	10 h 28	5	Strong coverage
March	5.9°C	-3.6°C	65 mm	9.5	1.1°C	11 h 47	5	Strong coverage
April	13°C	1.9°C	89 mm	11.7	4.0°C	13 h 19	25	Strong coverage
May	20.2°C	8.1°C	83 mm	10.5	9.6°C	14 h 36	61	Strong coverage
June	25.1°C	13.3°C	80 mm	8.6	16.9°C	15 h 19	82	Strong coverage
July	27.2°C	15.8°C	78 mm	9.4	21.9°C	15 h 02	76	Strong coverage
August	26.2°C	14.9°C	72 mm	8.6	22.9°C	13 h 55	82	Strong coverage
September	22.4°C	11.1°C	86 mm	8.4	20.7°C	12 h 26	76	Strong coverage
October	15.5°C	5.7°C	91 mm	10.7	16.0°C	10 h 58	40	Strong coverage
November	8.4°C	0.3°C	82 mm	10.5	10.4°C	9 h 41	9	Strong coverage
December	2.8°C	-4°C	68 mm	10.9	5.4°C	9 h 03	5	Strong coverage

Records at ST THOMAS WPCP, 1980–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.5°C13 Jan 2005	-31.0°C16 Jan 1984	44 mm27 Jan 1994	138 mm2020 · driest 21 mm in 2008	39
February	19.0°C23 Feb 2017	-32.0°C20 Feb 2015	42 mm19 Feb 2018	143 mm1990 · driest 4 mm in 2007	39
March	26.0°C21 Mar 2012	-25.5°C3 Mar 2003	43 mm30 Mar 2017	143 mm1985 · driest 14 mm in 2015	40
April	29.5°C25 Apr 1990	-16.0°C7 Apr 1982	56 mm20 Apr 2000	161 mm2023 · driest 18 mm in 2008	42
May	32.5°C30 May 1988	-4.5°C1 May 2021	65 mm27 May 1982	153 mm2004 · driest 18 mm in 2016	41
June	38.0°C25 Jun 1988	1.0°C22 Jun 1992	80 mm25 Jun 2021	221 mm1984 · driest 13 mm in 1988	40
July	37.0°C20 Jul 1987	6.0°C2 Jul 1988	104 mm2 Jul 2023	248 mm2023 · driest 18 mm in 2002	42
August	34.5°C8 Aug 2001	0.0°C29 Aug 1982	57 mm28 Aug 1990	179 mm1985 · driest 12 mm in 2002	41
September	33.0°C9 Sep 2002	-2.0°C28 Sep 1991	90 mm16 Sep 1983	195 mm2014 · driest 28 mm in 2004	40
October	29.0°C1 Oct 2019	-7.0°C31 Oct 1988	72 mm5 Oct 1995	174 mm2021 · driest 19 mm in 1998	40
November	22.0°C6 Nov 2022	-13.5°C21 Nov 1987	52 mm12 Nov 1992	197 mm1985 · driest 14 mm in 2012	40
December	18.5°C3 Dec 1982	-27.5°C24 Dec 1989	43 mm21 Dec 2013	169 mm1990 · driest 19 mm in 2014	39

Typical days per month at ST THOMAS WPCP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	3	8
February	0	0	24	2	6
March	<1	0	22	2	3
April	<1	0	11	3	<1
May	6	<1	2	3	0
June	16	3	0	2	0
July	22	6	0	2	0
August	20	3	0	2	0
September	9	<1	<1	3	0
October	<1	0	4	3	<1
November	0	0	14	2	2
December	0	0	22	2	6

How often, not how much — every day in ST THOMAS WPCP’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%	41%	7%	55%	-3.8–3.0°C
February	0%	35%	8%	46%	-2.0–3.6°C
March	2%	32%	8%	44%	3.6–8.7°C
April	9%	41%	10%	53%	10.9–15.2°C
May	35%	34%	9%	48%	17.9–22.4°C
June	63%	30%	10%	34%	23.1–26.2°C
July	70%	30%	9%	38%	25.5–29.2°C
August	69%	29%	10%	33%	24.5–27.7°C
September	51%	31%	11%	39%	20.5–24.2°C
October	13%	36%	11%	48%	13.2–17.1°C
November	<1%	37%	10%	53%	6.0–10.7°C
December	0%	37%	9%	52%	-0.9–5.8°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.

1981Each stripe is one year’s mean temperature against the 35-year average. Warmest: 1998. Coolest: 2014.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 6158357
NOAA station: CA006137362 · ST THOMAS WPCP
Station distance: 1.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 42.77°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 17 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 ST THOMAS WPCP is what differs

Port Stanley→Belmont→Candyville→Copenhagen→Dexter→Dunboyne→

Or put two places side by side: St. Thomas vs Port Stanley

Best time to visitSt. Thomas.

June

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
St. Thomas.

The whole year,
without the guesswork.

Nearby, measured,
and named.