Add organization

What is the weather like in Oslo in summer?

Summer temperatures, rain and daylight in Oslo, and what to pack.

Answered at: Checked at:

Short answer

Summer in Oslo is mild and light, with July as the warmest month and nights that never get fully dark from late June to early August. The 1991–2020 normals for Oslo (Blindern) give an average temperature of 15.3 °C in June, 17.7 °C in July and 16.5 °C in August. Some years bring days above 30 °C.

Oslo a round calendar wheel with four seasons shown as a snowflake, a leaf, a sun and a raindrop around a small mountain

Why

  1. The figures are MET's 1991–2020 normals for the whole day and night, so afternoon temperatures are higher than the average.
  2. Summer is also the wettest part of the year in Oslo, with normals of 80 mm in June, 87 mm in July and 103 mm in August.
  3. Yr recorded 32.9 °C at Blindern on 20 July 2025 and 31.8 °C on 15 June 2023.

Details

Visit Norway describes Eastern and Southern Norway as the regions with the warmest and most stable summer weather, with temperatures that can reach 25 °C or more. VisitOSLO highlights urban swimming, boating and paddling on the Oslo Fjord and saunas by the water as typical summer activities.

Tip

Pack light layers with a wool top, a rain jacket, a swimsuit and sunscreen, as Visit Norway recommends for summer in Norway.

What may differ

Normals describe an average summer. July 2024 averaged 16.9 °C at Blindern, slightly below normal, while July 2026 reached 18.5 °C.

People also ask

  • What is Oslo like in summer?
  • What should I wear in Oslo in summer?

Sources

Information checked on 15 October 2026.

Oslo
Help