Climate averages 1991–2020

Saint Helier weather
in January.

A cool, wet month: the 11th warmest and the 9th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 9.1°C Daytime mean, January

Average low 6.8°C Night-time mean, January

Rainfall 110 mm 16 days with ≥1 mm

Daylight 9 h Sunrise to sunset, per day

January is a cool month in Saint Helier: daytime highs average 9.1°C and nights cool to about 6.8°C. By daytime temperature it is the 11th warmest of the 12 months.

Expect about 110 mm of rain on roughly 16 days, which makes January a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 43 min on an average January day.

The nearest other city in this atlas is Rennes (124 km away). In January its highs average 8.4°C, 0.6°C cooler than Saint Helier, with 64 mm of rain.

From January to February, average highs fall by 0.4°C to 8.7°C, and monthly rainfall falls from 110 mm to 82 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Saint Helier climate table

1991–2020

Monthly climate averages for Saint Helier, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	9.1°C6.8°C	6.8°C	110	15.8	8.79 h
February	8.7°C6.3°C	6.3°C	82	13.0	10.110 h
March	9.7°C7.3°C	7.3°C	69	12.4	11.912 h
April	11.3°C8.6°C	8.6°C	57	10.5	13.714 h
May	13.7°C11.0°C	11.0°C	53	9.4	15.315 h
June	16.1°C13.4°C	13.4°C	50	8.7	16.216 h
July	17.9°C15.4°C	15.4°C	48	9.1	15.816 h
August	18.5°C16.1°C	16.1°C	63	9.8	14.414 h
September	17.5°C15.1°C	15.1°C	77	11.0	12.713 h
October	15.2°C12.9°C	12.9°C	122	15.5	10.811 h
November	12.2°C10.0°C	10.0°C	132	17.6	9.29 h
December	10.0°C7.7°C	7.7°C	138	16.7	8.38 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

January in nearby cities

Distance from Saint Helier

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Saint Helier) is explained once on the Saint Helier year overview and on the Sources, method and limits page.