SeasonMapSaint Helier (Channel Islands) weather in August
Jersey
August in Saint Helier: nice, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Saint Helier · #420 of 1383 destinations to visit in August · comfort 86/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Saint Helier in August
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Saint Helier climate normals — August
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Sea temperature | 19°C / 66°F | 🌊 fresh |
| Rainfall | 66 mm / 2.6 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 15°C / 59°F | |
| Sunshine | 11.1 h/day | |
| Daylight | 14.3 h | |
| Wind | 29 km/h / 18 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Saint Helier in August
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.
Peak crowdsBeach season, Battle of Flowers, school holidays in 7 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).
Best weatherSaint Helier's weather peaks June–August, best around July.
August includes Battle of Flowers.
Best weatherFair weatherToughest weather
What's on in Saint Helier in August
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 ↗
- Festival
Battle of Flowers
8–18 Aug · usuallyMajor festivalCrowdedBook earlyParish floats covered in cut flowers go down Victoria Avenue over two August days, with a lit parade on the second night. Free to watch from the pavement, and the island's beds go early for it. 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 August — FAQ
- Is August a good time to visit Saint Helier?
- August in Saint Helier: nice, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Saint Helier on SeasonMap's comfort score (86/100).
- What is the weather like in Saint Helier in August?
- In August, Saint Helier averages a daily high of 19.2°C and a low of 16.7°C, with about 65.5 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Saint Helier in August?
- Saint Helier has a mean US Air Quality Index of about 39 in August.
Other months in Saint Helier
Compare Saint Helier in August
Warmer or cooler than Saint Helier in August
Similar destinations in Western Europe — August
Within 300 km: Bournemouth's New Forest heather around 1 Aug – 10 Sep, and Isle of Wight's Cowes Week around 28 Jul – 12 Aug.