Jersey · 1991–2020

Best time to visit
Saint Helier.

July leads for comfortable weather in Saint Helier: typically 20.6°C by day, 14°C at night, with 47 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high20.6°C

Typical low14°C

Rain in July47 mm

Comfort

July

July · August · June

82climate match

Beach

July

July · August · June

49climate match

Outdoors

June

June · July · August

85climate match

The weakest month is December, scoring 11 against July’s 82 — days reach only 9.8°C, 14° 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

128.8° / 4.6°

Feb

178.9° / 4.2°

Mar

2910.9° / 5.5°

Apr

4113.3° / 6.9°

May

5716.2° / 9.5°

Jun

7118.8° / 12°

Jul

8220.6° / 14°

Aug

8020.7° / 14.5°

Sep

7118.9° / 13.1°

Oct

4515.5° / 10.8°

Nov

2511.9° / 7.8°

Dec

119.8° / 5.3°

Monthly climate evidence for Saint Helier — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 7 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	8.8°C	4.6°C	93 mm	14.9	9.5°C	8 h 37	12	Strong coverage
February	8.9°C	4.2°C	76 mm	12.3	8.7°C	10 h 03	17	Strong coverage
March	10.9°C	5.5°C	62 mm	11	8.7°C	11 h 43	29	Strong coverage
April	13.3°C	6.9°C	56 mm	9.9	10.1°C	13 h 38	41	Strong coverage
May	16.2°C	9.5°C	52 mm	8.3	12.0°C	15 h 17	57	Strong coverage
June	18.8°C	12°C	50 mm	7.8	14.5°C	16 h 12	71	Strong coverage
July	20.6°C	14°C	47 mm	7.2	16.6°C	15 h 50	82	Strong coverage
August	20.7°C	14.5°C	60 mm	8.1	17.9°C	14 h 24	80	Strong coverage
September	18.9°C	13.1°C	61 mm	9.1	17.5°C	12 h 32	71	Strong coverage
October	15.5°C	10.8°C	102 mm	14	15.9°C	10 h 41	45	Strong coverage
November	11.9°C	7.8°C	113 mm	15.9	13.5°C	9 h 03	25	Strong coverage
December	9.8°C	5.3°C	122 mm	16.2	11.2°C	8 h 13	11	Strong coverage

What has changed

Saint Helier runs +1.4°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

+1.1

Feb

+1.3

Mar

+1.5

Apr

+2.2

May

+1.5

Jun

+1.7

Jul

+1.5

Aug

+1.1

Sep

+1.3

Oct

+1.1

Nov

+1.2

Dec

+1.6

July daytime highs, 2011–2025. Last recorded: 21.7°C.

Records at JERSEY: AIRPORT, 1960–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.3°C25 Jan 1983	-10.9°C20 Jan 1963	36 mm29 Jan 2025	184 mm1988 · driest 14 mm in 1992	67
February	16.7°C24 Feb 2026	-8.7°C7 Feb 1991	39 mm27 Feb 2010	165 mm2026 · driest 6 mm in 1965	67
March	22.0°C31 Mar 2021	-4.7°C7 Mar 1971	52 mm10 Mar 2013	167 mm2001 · driest 3 mm in 1961	67
April	25.8°C29 Apr 2025	-1.6°C12 Apr 1986	26 mm27 Apr 2024	164 mm1998 · driest 1 mm in 2011	67
May	34.1°C25 May 2026	0.0°C2 May 1979	48 mm31 May 1983	140 mm2008 · driest 3 mm in 1989	67
June	34.9°C23 Jun 2026	5.5°C4 Jun 1984	40 mm11 Jun 2020	124 mm2020 · driest 1 mm in 1976	67
July	36.0°C22 Jul 2019	8.5°C1 Jul 1972	62 mm6 Jul 1969	107 mm2011 · driest 1 mm in 2022	66
August	34.8°C4 Aug 2003	7.7°C30 Aug 2011	71 mm3 Aug 2008	150 mm2015 · driest 1 mm in 1976	66
September	30.9°C6 Sep 2021	5.6°C28 Sep 1974	47 mm1 Sep 1963	166 mm1993 · driest 3 mm in 1997	66
October	25.6°C2 Oct 2011	0.4°C29 Oct 1997	51 mm11 Oct 2004	225 mm2020 · driest 3 mm in 1969	66
November	17.2°C6 Nov 2015	-3.1°C30 Nov 2016	49 mm30 Nov 2003	217 mm2023 · driest 25 mm in 1978	66
December	15.1°C21 Dec 1977	-8.4°C27 Dec 1970	42 mm30 Dec 1978	269 mm1999 · driest 1 mm in 1995	66

Typical days per month at JERSEY: AIRPORT, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)
January	0	3	3
February	0	3	2
March	0	<1	2
April	<1	0	1
May	<1	0	2
June	2	0	2
July	3	0	1
August	3	0	2
September	1	0	2
October	<1	0	3
November	0	<1	4
December	0	2	4

The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 83); on 2011–2025 it is July (89). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in JERSEY: AIRPORT’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%	50%	9%	65%	6.8–10.1°C
February	0%	43%	7%	59%	6.8–10.6°C
March	<1%	38%	5%	49%	8.8–12.2°C
April	3%	32%	4%	40%	11.0–14.6°C
May	12%	28%	5%	32%	14.0–18.0°C
June	25%	25%	5%	29%	16.4–20.4°C
July	39%	23%	3%	27%	18.3–22.6°C
August	39%	25%	4%	29%	18.8–22.2°C
September	21%	32%	6%	43%	16.9–20.3°C
October	3%	42%	9%	55%	14.0–17.2°C
November	0%	52%	12%	70%	10.5–13.0°C
December	0%	51%	11%	68%	8.1–10.7°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.

1960Each stripe is one year’s mean temperature against the 66-year average. Warmest: 2022. Coolest: 1963.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 3042091
NOAA station: UKE00105880 · JERSEY: AIRPORT
Station distance: 7.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 49.19°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 7 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 JERSEY: AIRPORT is what differs

Saint-Malo→Granville→Dinard→Coutances→Cancale→St Lawrence→

Or put two places side by side: Saint Helier vs Saint-Malo

Best time to visitSaint Helier.

July

July

June

The whole year,without the guesswork.

Saint Helier runs +1.4°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Saint Helier.

The whole year,
without the guesswork.

Saint Helier runs +1.4°C
on the 1961–1990 baseline.

Nearby, measured,
and named.