Saint Helier in Fall
In fall (September, October and November), Saint Helier sees average daytime highs around 15°C and overnight lows near 13°C, with 331 mm of rain over about 44 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 18°C in early September to 11°C by late November. The sky is clear or mostly clear about 20% of the time across fall, and the air most often feels dry.
Fall is Saint Helier's 2nd-best season to visit on our travel score. For the whole year in context, see Saint Helier's year-round climate.
- Avg daytime high
- 15°C
- 2nd-warmest season
- Avg overnight low
- 13°C
- Rainfall
- 331 mm
- 44 wet days
- Avg wind
- 27 km/h
- Travel score
- 4.1
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Saint Helier in Fall
Over the season highs ease from about 18°C in early September to 11°C by late November.
A typical fall day in Saint Helier reaches about 15°C and drops to 13°C overnight. The warmest of the three months is September, the coolest November.
Saint Helier weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 9° / 7° | 110 | 15.8 | 8.5 | 1.5 |
| Feb | 9° / 7° | 81 | 12.9 | 9.8 | 1.4 |
| Mar | 9° / 8° | 69 | 12.4 | 11.6 | 1.9 |
| Apr | 11° / 9° | 57 | 10.5 | 13.4 | 2.7 |
| May | 13° / 11° | 53 | 9.4 | 15 | 3.8 |
| Jun | 16° / 14° | 50 | 8.7 | 15.9 | 5.0 |
| Jul | 18° / 16° | 48 | 9.1 | 15.6 | 6.0 |
| Aug | 18° / 17° | 63 | 9.8 | 14.2 | 6.1 |
| Sep | 17° / 16° | 77 | 11 | 12.4 | 5.5 |
| Oct | 15° / 13° | 122 | 15.5 | 10.5 | 4.0 |
| Nov | 12° / 10° | 132 | 17.6 | 8.9 | 2.7 |
| Dec | 10° / 8° | 138 | 16.7 | 8.1 | 1.9 |
Cloud cover in Fall
The sky is clear or mostly clear about 20% of the time across fall.
Chance of precipitation in Fall
Saint Helier gets around 331 mm of rain over 44 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 27 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 18 min in early September to 8 h 18 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 2.4 kWh/m².
Hazard calendar for Saint Helier
In fall, Saint Helier overlaps 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.
Is fall a good time to visit Saint Helier?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Saint Helier for sightseeing.
What to pack for Saint Helier in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Saint Helier sees daytime highs around 15°C and nights near 13°C. Pack rain gear and a windbreaker. Worth having: a warm layer. About 44 days see rain.
Sea temperature near Saint Helier in Fall
The nearest coast averages about 16°C across fall — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 10 | 9 | 9 | 10 | 12 | 15 | 17 | 18 | 18 | 16 | 14 | 11 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 10 | Bracing |
| Feb | 9 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 12 | Bracing |
| Jun | 15 | Bracing |
| Jul | 17 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 16 | Cool |
| Nov | 14 | Bracing |
| Dec | 11 | Bracing |
UV index in Saint Helier in Fall
Clear-sky midday UV across fall averages around 3. 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 5 | 6 | 7 | 6 | 7 | 5 | 3 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | Moderate |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 6 | High |
| Aug | 7 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
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.
Jersey travel facts
- Power plugs
- Type G
- 230 V · 50 Hz
- Religion
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.