What September feels like in Oslo
September is early autumn in Oslo. Daytime feels cool and fresh rather than cold. The gap between afternoon and night is small, so nights are cool and the temperature hardly changes after dark. Moisture in the air gives the cold a damp edge.
Rain in Oslo in September
It is a changeable month: rain comes about one day in 3, with dry spells in between. A rainy day brings about 8.3 mm (0.3 in) on average — steady rain rather than a passing shower. The yearly figure is similar, around 7.1 mm per wet day.
Daylight and sunshine in September
On 15 September the sun rises at about 6:42 am and sets around 7:42 pm local time, giving 13 h of daylight. Compared with mid-August, the day has lost 2 h 45 min. The sun is out for roughly 59% of those daylight hours, so sun and cloud share the day.
How September compares to the rest of the year
Ranked by average high, September comes out as the 4th warmest month in Oslo. Against August, the average high is 3.8°C (6.8°F) lower, with 23 mm less rain. The cooling trend carries on into October. October averages a high of 9.5°C (49.1°F).
Who September suits
- Sightseeing: a good fit — daytime temperatures are fine for walking around.
- Parks & outdoor: a good fit — comfortable for long walks and picnics.
- Beach: less ideal — the sea air is too cool.
- Hiking: less ideal — trails are cool.
Tips for visiting Oslo in September
Rain Protection
A compact umbrella and a light waterproof jacket.
Light Jacket
Cool days — a light jacket or sweater for walking around.
Sunglasses
Plenty of sun, so bring sunglasses and a cap.
Quick questions
How warm is Oslo in September?
Afternoons average 15.9°C (60.6°F) and nights about 9.7°C (49.5°F) — cool by most people's standards. It is the 4th warmest month of the year.
Does it rain a lot in Oslo in September?
Quite a lot — 91 mm spread over about 11 days.
What should I wear in Oslo in September?
Pack rain protection, a light jacket and sunglasses. There is little need to change for the evening.
Is September or October better for visiting Oslo?
September, clearly: it ranks #4 of 12 among Oslo's months, against #7 for the other. October is cooler and has more rainy days.