Saint Peter Port (Sark) weather in August

August in Saint Peter Port: nice, a little rain, with clean air — one of the best months to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Saint Peter Port Guernsey · British Isles · City89
  1. 53Jan
  2. 62Feb
  3. 68Mar
  4. 78Apr
  5. 83May
  6. 88Jun
  7. 92Jul
  8. 89Aug
  9. 85Sep
  10. 71Oct
  11. 60Nov
  12. 54Dec

#2 of 12 months in Saint Peter Port · #306 of 1413 destinations to visit in August · comfort 89/100 (tier A)

Days
21°C
Nights
15°C
Wet days
7
Sun
11.1 h
Humidity
85%
Daylight
14 h
Saint Peter Port, Guernsey
Photo: Man vyi · Public domain

Traveller notes on Saint Peter Port in August

Notes from nearby Bournemouth (148 km away)

Saint Peter Port doesn't have its own notes for August yet — these are about Bournemouth, close enough to share the season.

August in Bournemouth is the peak of everything. A good day can reach the mid-to-high 20s°C, though the monthly average high sits nearer 21, with the sea around 17°C. The forum's real subject, though, is volume: a very hot summer's day brings roughly 80,000 people to the beach, and an airshow day upwards of 250,000. Regulars advise avoiding the Pier area for crowding and parking and heading to Southbourne, Christchurch and Hengistbury Head, or Mudeford instead. Two August fixtures worth timing around: fireworks off the pier every Friday night from late July to the end of August, and the Wednesday candlelight evenings in the lower gardens.
Tripadvisor community · August · 1 month ago · about Bournemouth · Read more on Tripadvisor ↗

Other months in Saint Peter Port

There isn't much January-specific forum detail for Saint Peter Port itself, but Guernsey's general weather threads agree conditions are genuinely variable this time of year and can turn on short notice. The island's own climate record fills in the rest: this is a proper Channel Islands winter, with frequent rain, mild but chilly daytime temperatures, and wind that regularly gusts strong enough to keep umbrellas at home in favor of a proper waterproof coat. Daylight is short too, so plan outdoor harbor walks for the middle of the day.
ChannelIslandsWinterResident · January · 1 month ago · Read more on Tripadvisor ↗
Forum posters name July/August as genuine high season - busier streets and traffic in St Peter Port, but with the reliability upside that ferry cancellations due to bad weather are far less common in summer than other times of year. The town itself is described as hilly enough that finding flat accommodation is a challenge, though it's consistently called a lovely base for 2-4 days, with a strong restaurant and pub scene. Clifftop walks are named a highlight of a July visit, and posters recommend day trips by ferry to the quieter neighboring islands of Herm (walkable in under three hours) and Sark for a slower-paced contrast to the town. The standard caveat: weather can still be fickle even in summer, so posters suggest padding an extra day into the itinerary to guarantee at least one clear day for outdoor plans.
Tripadvisor community · July · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Saint Peter Port's card on the map.

Saint Peter Port climate normals — August

Daytime high21°C / 69°F😎 nice
Nighttime low15°C / 59°F
Feels like (high)20°C / 68°F
Sea temperature18°C / 64°F🧊 bracing
Rainfall47 mm / 1.8 in🌦 some rain
Rainy days7 days
Humidity85%💦 very humid
Dew point15°C / 59°F
Sunshine11.1 h/day
Daylight14.4 h
Wind30 km/h / 19 mph
Air quality (US AQI)42🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Saint Peter Port 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.

Busyschool holidays in 7 of the markets that fill it, one of its best months for weather(estimated)

JFMAMJJASOND

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).

Best weatherSaint Peter Port's weather peaks June–August, best around July.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Saint Peter Port in August

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Season

    Herm and Sark boat season

    15 Apr – 15 Oct · usuallySummer season opens

    The 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 ↗

What's on around the world in August →

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?

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Saint Peter Port in August — FAQ

Is August a good time to visit Saint Peter Port?
August in Saint Peter Port: nice, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Saint Peter Port on SeasonMap's comfort score (89/100).
What is the weather like in Saint Peter Port in August?
In August, Saint Peter Port averages a daily high of 20.8°C and a low of 15.2°C, with about 46.8 mm of rain over roughly 7.4 rainy days.
What is the air quality in Saint Peter Port in August?
Saint Peter Port has a mean US Air Quality Index of about 42 in 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.