Saint Helier weather in January

In January, Saint Helier sees average daytime highs of 9°C and overnight lows near 7°C, with 110 mm of precipitation across 15.8 wet days and about 8.5 hours of daylight. It is the 11th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 9°C through the month. The sky is clear or mostly clear about 13% of the time in January, and the air most often feels dry.

Daylight stretches from about 8 h 06 min at the start of January to 9 hours by month's end. Set against the rest of the year, January is Saint Helier's 12th-clearest and 1st-windiest month. For the whole year in context, see Saint Helier's year-round climate.

Daytime high
11th warmest
Overnight low
2nd coldest
Precipitation
110 mm
15.8 wet days
Daylight
8 h 24 min
8:05 AM – 4:30 PM
Cloud cover
74%
12th clearest
Wind
31 km/h
1st windiest
Solar energy
1.01 kWh/m²
Travel score
1.5
out of 10

Saint Helier is one of the twelve parishes and capital of Jersey in the Channel Islands.

Density
2,642/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 9°C through the month.

A typical January day in Saint Helier reaches about 9°C in the afternoon and slips back to 7°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 12°C. Set against its neighbours, January runs about 1°C cooler than December and on par with February.

10°15°151015202531
Avg high (°C)Avg low (°C)
1107
297
397
497
597
697
797
897
997
1097
1197
1297
1397
1497
1597
1697
1797
1897
1997
2097
2197
2297
2397
2497
2597
2697
2797
2897
2997
3096
3196

Saint Helier weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan / 11015.88.51.5
Feb / 8112.99.81.4
Mar / 6912.411.61.9
Apr11° / 5710.513.42.7
May13° / 11°539.4153.8
Jun16° / 14°508.715.95.0
Jul18° / 16°489.115.66.0
Aug18° / 17°639.814.26.1
Sep17° / 16°771112.45.5
Oct15° / 13°12215.510.54.0
Nov12° / 10°13217.68.92.7
Dec10° / 13816.78.11.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of January, with mostly cloudy or overcast conditions the remaining 73%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22872
32872
42872
52773
62773
72773
82773
92773
102773
112773
122674
132674
142674
152674
162773
172773
182674
192674
202674
212674
222773
232674
242674
252674
262773
272674
282674
292674
302674
312773

Chance of precipitation in January

Any precipitation

Saint Helier gets around 110 mm of rain and snow over 15.8 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 51% and peaks near 53% on the wettest days, and about 0 day brings snow.

0%20%40%60%151015202531
Rain chance (%)
153
253
353
453
553
653
753
852
952
1052
1152
1252
1352
1452
1552
1652
1751
1851
1951
2051
2151
2250
2350
2449
2549
2648
2748
2847
2947
3047
3147

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 31 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 29 km/h on the calmest days to 32 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
132windy
232windy
332windy
432windy
532windy
632windy
732windy
832windy
932windy
1032windy
1132windy
1231windy
1331windy
1431windy
1531windy
1631windy
1731windy
1831windy
1931windy
2030windy
2130windy
2230windy
2330windy
2430windy
2530windy
2630windy
2730windy
2830windy
2930windy
3029windy
3129windy

Sunrise & sunset in January

DaylightNight

Daylight runs from about 8 h 06 min at the start of January to 9 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over January. Sunrise moves from 8:10 AM to 7:51 AM, and sunset from 4:13 PM to 4:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.18:104:13
28.18:104:14
38.18:104:15
48.18:104:16
58.18:104:17
68.18:094:18
78.28:094:19
88.28:094:20
98.28:094:21
108.28:084:23
118.38:084:24
128.38:074:25
138.38:074:26
148.48:064:28
158.48:064:29
168.48:054:30
178.58:044:32
188.58:044:33
198.58:034:35
208.68:024:36
218.68:014:37
228.68:004:39
238.77:594:40
248.77:594:42
258.87:584:43
268.87:564:45
278.97:554:46
288.97:544:48
298.97:534:50
309.07:524:51
319.07:514:53

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1.01 kWh/m².

For context, solar energy here swings from a low near 0.83 kWh/m² to a high of 6.27 kWh/m² in June across the year — January's 1.01 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.8Dim
20.8Dim
30.8Dim
40.9Dim
50.9Dim
60.9Dim
70.9Dim
80.9Dim
90.9Dim
100.9Dim
110.9Dim
120.9Dim
131.0Dim
141.0Dim
151.0Dim
161.0Dim
171.0Dim
181.0Dim
191.1Dim
201.1Dim
211.1Dim
221.1Dim
231.1Dim
241.1Dim
251.2Dim
261.2Dim
271.2Dim
281.3Dim
291.3Dim
301.3Dim
311.3Dim
Planning a trip in January

Hazard calendar for Saint Helier

In seasonPeak

In January, Saint Helier sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Saint Helier's rainy season runs August–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Saint Helier?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

1.5
Sightseeing
11th-best month of the year
0.0
Beach & pool
8th-best month of the year

January is a weaker month for outdoor sightseeing in Saint Helier.

What to pack for Saint Helier in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Saint Helier sees daytime highs around 9°C and nights near 7°C. Pack a warm layer, rain gear and a windbreaker. About 16 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Saint Helier in January

The nearest coast averages about 10°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 18°C and coldest in February near 9°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan10Bracing
Feb9Bracing
Mar9Bracing
Apr10Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep18Cool
Oct16Cool
Nov14Bracing
Dec11Bracing

UV index in Saint Helier in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saint Helier peaks around August 13 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 13UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7High
Jul6High
Aug7High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Saint Helier?

Saint Helier sits at 49.2°N, 2.1°W, 11 m above sea level, in Jersey. The nearest listed city is Saint Peter Port, 43 km away.

Topography around Saint Helier

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint Helier.

Within 3 km, the terrain around Saint Helier has only modest variations in elevation — a maximum elevation change of 100 m around an average of 31 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 137 m; within 80 km, significant variations in elevation — a maximum elevation change of 290 m.

The land around Saint Helier is covered by water (32%), trees (22%) and artificial surfaces (21%) within 3 km, water (85%) within 16 km, and water (68%) within 80 km.

3 km
100 m
16 km
137 m
80 km
290 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Saint Peter Port 43 km · Octeville 59 km · Saint-Malo 61 km · Équeurdreville-Hainneville 61 km · Cherbourg 61 km · Tourlaville 63 km · Saint-Lô 74 km · Saint-Brieuc 89 km

Jersey travel facts

Power plugs
Type G
230 V · 50 Hz
Religion
Christian 85%agnostic 13%atheist 1%Baha'i 0%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Saint Helier (49.188°, -2.1049°, elevation 11 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).