SeasonMapSaint Helier (Channel Islands) weather in September
Jersey
September in Saint Helier: nice, rainy, with clean air — an excellent time to visit.
#5 of 12 months in Saint Helier · #725 of 1383 destinations to visit in September · comfort 80/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Saint Helier in September
No notes yet. Open Saint Helier on the map to add the first one.
Saint Helier climate normals — September
| Daytime high | 19°C / 65°F | 😎 nice |
|---|---|---|
| Nighttime low | 16°C / 61°F | |
| Sea temperature | 19°C / 67°F | 🌊 fresh |
| Rainfall | 96 mm / 3.8 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 14°C / 57°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 12.6 h | |
| Wind | 31 km/h / 19 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Saint Helier in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyBeach season, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Saint Helier's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherSaint Helier's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Saint Helier in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Beach season
20 Jun – 20 Sep · usuallySea warm enoughCrowdedThe Channel only really warms up for three months, and the tide does the rest of the work: the sea goes out far enough at St Aubin's Bay to double the beach. Bring a wetsuit if you plan to be in it long. Source ↗
Nearby, and something's on
Within 300 km of Saint Helier — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Saint Helier?
Saint Helier in September — FAQ
- Is September a good time to visit Saint Helier?
- September in Saint Helier: nice, rainy, with clean air — an excellent time to visit. It ranks #5 of 12 months for Saint Helier on SeasonMap's comfort score (80/100).
- What is the weather like in Saint Helier in September?
- In September, Saint Helier averages a daily high of 18.6°C and a low of 16°C, with about 96.1 mm of rain over roughly 11.6 rainy days.
- What is the air quality in Saint Helier in September?
- Saint Helier has a mean US Air Quality Index of about 43 in September.
Other months in Saint Helier
Compare Saint Helier in September
Warmer or cooler than Saint Helier in September
Similar destinations in Western Europe — September
Within 300 km: Bournemouth's New Forest heather around 1 Aug – 10 Sep, and Nantes' Le Voyage a Nantes on 4 Jul – 6 Sep.