Climate averages 1991–2020
Saint Helier weather
in October.
A mild, wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Saint Helier: daytime highs average 15.2°C and nights cool to about 12.9°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 122 mm of rain on roughly 16 days, which makes October a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 50 min on an average October day.
The nearest other city in this atlas is Rennes (124 km away). In October its highs average 16.3°C, 1.1°C warmer than Saint Helier, with 69 mm of rain.
From October to November, average highs fall by 3.0°C to 12.2°C, and monthly rainfall rises from 122 mm to 132 mm.
The annual picture
October in context
Monthly rainfall
Average total · mmAverages 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
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 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, selected | 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
October in nearby cities
- Rennes in OctoberFrance · 124 kmHigh 16.3°C · Low 9.7°C · 69 mm rain
- Caen in OctoberFrance · 127 kmHigh 15.9°C · Low 9.9°C · 65 mm rain
- Le Havre in OctoberFrance · 164 kmHigh 15.6°C · Low 10.8°C · 104 mm rain
- Poole in OctoberUnited Kingdom · 170 kmHigh 14.6°C · Low 10.6°C · 82 mm rain
- Bournemouth in OctoberUnited Kingdom · 171 kmHigh 14.5°C · Low 10.6°C · 82 mm rain
- Portsmouth in OctoberUnited Kingdom · 193 kmHigh 14.7°C · Low 9.7°C · 96 mm rain
- Brest, France in OctoberFrance · 196 kmHigh 15.2°C · Low 11.8°C · 92 mm rain
- Plymouth in OctoberUnited Kingdom · 197 kmHigh 14.4°C · Low 10.3°C · 104 mm rain
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 limitsHow 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.