What to pack for Oslo in September
- long sleeves and a warm layer
- a medium jacket
- a compact umbrella or rain shell — rain is frequent
Humidity averages 79%; max daily wind around 16 km/h.
How September compares
Best months in Oslo: June–September. See the full best time to visit Oslo guide.
Oslo in September: the details
In September, Oslo sees average daytime highs of 17°C (62°F) and overnight lows of 10°C (50°F). Rainfall totals roughly 94 mm across 10.2 rainy days, and the sun shines about 7.5 hours per day with 12.5 hours of daylight mid-month. Relative humidity averages 79%.
In context: September is the 4th-warmest month and the 4th-wettest in Oslo. The sunniest month is June (13 h/day).
| Metric | September average |
|---|---|
| Daytime high | 17°C / 62°F |
| Overnight low | 10°C / 50°F |
| Rainfall | 94 mm over 10.2 rainy days |
| Sunshine | 7.5 h/day (12.5 h daylight) |
| Humidity | 79% |
| Travel score | 8.2 / 10 |
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Oslo, Norway (59.91, 10.75) — see our methodology. Actual conditions vary year to year.
Not set on Oslo? Browse the best places to visit in September ranked by travel score.
Frequently asked questions
How hot is Oslo in September?
Daytime highs in Oslo in September average 17°C (62°F); nights drop to about 10°C.
Does it rain in Oslo in September?
Expect around 10.2 rainy days and 94 mm of rainfall in September.
Is September a good time to visit Oslo?
September is a good month to visit Oslo. Overall travel score: 8.2/10. The best months are June–September.
Also good in September, near Oslo
Where should you go next month?
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