Saint Helena — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Saint Helena. Learn about today’s conditions, monthly averages, and how the surrounding seas and oceans vary by season. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
Coastal Seas and Oceans
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Saint Helena’s surrounding sea sits in a mild subtropical band, so water temperatures remain fairly steady through the year. In summer (December–February) surface temperatures typically range from about 22–25 °C (72–77 °F), offering comfortably warm conditions for most swimmers. Autumn and spring (March–May and September–November) usually see values around 21–23 °C (70–73 °F). During the coolest months of winter (June–August) the sea can drop to roughly 20–22 °C (68–72 °F). These figures are approximate averages and local conditions close to shore can vary slightly with currents, wind and seasonal upwelling.
Swimming Conditions
Swimming around Saint Helena is widely practiced and there are many sheltered coves and bays suitable for bathing, snorkeling and recreational diving; the island’s clear water and rich marine life make it appealing for underwater activities. However, much of the coastline is rocky with limited sandy beaches, and open-ocean swells and currents can be strong at exposed sites, so swimmers should choose sheltered spots and check conditions before entering. Lifeguard services are generally not available and medical facilities are limited, so visitors are advised to swim with a companion, wear suitable protection (a light wetsuit or shorty can be helpful in cooler months) and use local advice for safe entry points. Overall, swimming is allowed and enjoyable with sensible precautions.