SeasonMapSaint Peter Port (Sark) weather in September
Guernsey
September in Saint Peter Port: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Saint Peter Port · #496 of 1383 destinations to visit in September · comfort 85/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Saint Peter Port in September
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Saint Peter Port climate normals — September
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 58°F | |
| Feels like (high) | 18°C / 64°F | |
| Sea temperature | 18°C / 65°F | 🧊 bracing |
| Rainfall | 61 mm / 2.4 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 13°C / 56°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 12.6 h | |
| Wind | 34 km/h / 21 mph | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Saint Peter Port 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.
Shoulder seasonschool holidays in 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Saint Peter Port'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 Peter Port's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Saint Peter Port in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Herm and Sark boat season
15 Apr – 15 Oct · usuallySummer season opensThe small boats to Herm, Sark and Alderney run frequently from the harbour through the season and thin out sharply after October. Half the reason to be based here is the day you spend on another island. Source ↗
Nearby, and something's on
Within 300 km of Saint Peter Port — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Saint Peter Port?
Saint Peter Port in September — FAQ
- Is September a good time to visit Saint Peter Port?
- September in Saint Peter Port: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Saint Peter Port on SeasonMap's comfort score (85/100).
- What is the weather like in Saint Peter Port in September?
- In September, Saint Peter Port averages a daily high of 19.2°C and a low of 14.2°C, with about 61.1 mm of rain over roughly 9.3 rainy days.
- What is the air quality in Saint Peter Port in September?
- Saint Peter Port has a mean US Air Quality Index of about 44 in September.
Other months in Saint Peter Port
Compare Saint Peter Port in September
Warmer or cooler than Saint Peter Port in September
Similar destinations in Western Europe — September
Within 300 km: Bournemouth's New Forest heather around 1 Aug – 10 Sep, and Bath's Jane Austen Festival on 11–20 Sep.