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Best time to visit Oslo: month by month
Short answer
May to September is the best time, with highs of about 15-22°C and very long days (around 19 hours of light in June). Winter is cold (about -2 to 2°C highs) and dark, but good for skiing and saunas.
Month by month
| Month | High | Low | Rainy days | Crowds |
|---|---|---|---|---|
| Jan | 0°C | -5°C | 10 | low |
| Feb | 2°C | -5°C | 10 | medium |
| Mar | 5°C | -4°C | 6 | medium |
| Apr | 10°C | 0°C | 6 | low |
| May | 15°C | 6°C | 13 | medium |
| Jun | 22°C | 12°C | 9 | high |
| Jul | 21°C | 13°C | 14 | very high |
| Aug | 20°C | 12°C | 12 | high |
| Sep | 16°C | 10°C | 9 | medium |
| Oct | 10°C | 5°C | 12 | low |
| Nov | 4°C | 0°C | 13 | low |
| Dec | -2°C | -7°C | 11 | medium |
Temperatures and rainy days: Copernicus ERA5 averages, 2021–2023. Crowd levels are our estimate.
Season by season
Spring (Mar–May)
About 5°C in March rising to 15°C in May; snow lingers in the hills, and 17 May brings Constitution Day parades.
Summer (Jun–Aug)
Mild, about 20-22°C by day and 12-13°C at night, with long light evenings and some rain; the busiest season.
Autumn (Sep–Nov)
About 16°C in September dropping to 4°C in November; autumn colour and quieter museums.
Winter (Dec–Feb)
Cold and dark, about -2 to 2°C by day and -5 to -7°C at night; skiing on city trails reachable by metro.
Events worth planning around
- Constitution Day, 17 May
- Holmenkollen Ski Festival, March
- Øya music festival, August
- Nobel Peace Prize ceremony, 10 December
When to avoid
November is often grey, wet and dark without snow. If you dislike crowds, avoid cruise-ship days in July around the harbour.
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Common questions
What is the best month to visit Oslo?
June to August for long days and mild weather, or May and September for fewer crowds.
How cold is Oslo in winter?
Highs of about -2 to 2°C and lows of -5 to -7°C from December to February.
When is Norway's Constitution Day?
On 17 May, with parades, flags and national costumes across Oslo.