When To Go · Destination Guide

Isles of Scilly

Cold-water wrecks, jewel-anemone walls and grey seals beyond Land's End

When to go

Best time to visit Isles of Scilly

Plan the main waterfocused trip for May to September.

Best overall window

Milder air, long daylight, relatively lower rainfall and the broadest wateractivity schedule. July and August are warmest and busiest.

Outside that window

Cooler, wetter and windier, with reduced visitor services and a higher chance of ferry, flight and smallboat disruption.

Start with the overall answer, then switch only when scuba, freedive, snorkel, or topside timing changes the trip in a meaningful way.

The overall row stays visible so you can compare it against the currently selected scope.

BestGoodTradeoffsMore variable

Scope	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Overall	Overall - Jan: Tradeoffs	Overall - Feb: Tradeoffs	Overall - Mar: Tradeoffs	Overall - Apr: Good	Overall - May: Best	Overall - Jun: Best	Overall - Jul: Best	Overall - Aug: Best	Overall - Sep: Best	Overall - Oct: Good	Overall - Nov: Tradeoffs	Overall - Dec: Tradeoffs

These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.

Guided Atlantic Grey Seal Snorkeling
Best for Snorkel, Scuba
Apr to Sep
JanFebMarAprMayJunJulAugSepOctNovDec
Seal Snorkelling Adventures publishes guided trips from St Martin's to the Eastern Isles during this period.
Grey Seal Pupping and Breeding
Best for Topside, Snorkel, Scuba
Aug to Dec
JanFebMarAprMayJunJulAugSepOctNovDec
Pups begin appearing from late August, with important breeding areas around the Western Rocks, Annet and the Eastern Isles.
Puffins and Breeding Seabird Safaris
Best for Topside
Apr to Jul
JanFebMarAprMayJunJulAugSepOctNovDec
Boat safaris toward the Norrad Rocks, Annet, Western Rocks and Eastern Isles offer the strongest seasonal chance of puffins and active seabird colonies without disturbing nesting sites.
Offshore Pelagic Birding
Best for Topside
Jul to Aug
JanFebMarAprMayJunJulAugSepOctNovDec
Longer offshore trips target shearwaters, skuas, petrels and possible cetaceans in settled weather.
Autumn Bird Migration
Best for Topside
Sep to Oct
JanFebMarAprMayJunJulAugSepOctNovDec
The islands become a major migrationwatching destination as unusual landbirds arrive.
World Pilot Gig Championships
Best for Topside
Apr to May
JanFebMarAprMayJunJulAugSepOctNovDec
The annual championships cluster around the turn of April and May, filling Hugh Town and the harbor with racing crews.

Jul to Aug: The warmest school-holiday period puts pressure on accommodation, inter-island trips and mainland connections.
Nov to Mar: Atlantic storms, low cloud and stronger winds can reduce services or interrupt access.

Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.