Oslo County — Water Temperature Today and Throughout the Year
Discover water temperatures in Oslo County (Norway), with real-time data and annual trends. Find all locations in the region and check the water temperature in them. 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 in Lakes and Rivers
Popular Lakes
Popular Rivers
Popular Places
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Oslo County, located at the head of the Oslofjord, experiences relatively mild sea temperatures compared to Norway’s western and northern coasts. During winter, from December to March, water temperatures typically range between 1°C (33.8°F) and 4°C (39.2°F). In particularly cold winters, ice can form in the inner parts of the fjord, especially in sheltered bays and harbors. However, due to the fjord’s connection to the North Sea, complete freezing is rare, and deeper waters remain ice-free year-round.
In summer, from June to August, sea temperatures in the Oslofjord rise significantly, often reaching 16°C (60.8°F) to 20°C (68°F), making it one of the warmest coastal areas in Norway for swimming. Shallow beaches and calm waters contribute to faster warming, attracting many locals and tourists to seaside spots like Huk, Bygdøy, and Hvervenbukta. The relatively warm waters make the region ideal for kayaking, sailing, and other water activities, especially during the peak of summer.