Oslo weather in September
“Mild and bright — an underrated time to visit.”
Roughly 12 rainy days across the month, on average.
In september, Oslo settles into its quieter, cooler pace. The city keeps a different pulse than in summer or midwinter, and travellers who arrive with the right expectations are rewarded.
Days average around 16°C (61°F), cooling to 10°C after sunset. Expect meaningful rain — some 12 wet days across the month. Pack accordingly and let the weather choose your afternoons.
These figures are climatological averages, drawn from a decade of daily records via the Open-Meteo Archive — not a forecast. But they are honest, and they are the sort of thing a good travel guide ought to tell you before you book the flight.
What to pack for Oslo in September
- •A light layer for cool mornings and evenings
- •A compact travel umbrella — one you'll actually carry
- •A merino base layer for the cold evenings
- •Comfortable, broken-in walking shoes
- •A small daypack that won't look like a tourist beacon
What to pack for Oslo in September
- →Breathable travel pantsAmazon · shop this
- →Packable rain jacketAmazon · shop this
- →Compact travel umbrellaAmazon · shop this
- →Waterproof dry bagAmazon · shop this
- →Universal travel adapterAmazon · shop this
- →Compression packing cubesAmazon · shop this
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Oslo in September — FAQ
Q01Is September a good month for Oslo?
Is September a good month for Oslo?
It is a fair time to visit — expect variable conditions and plan flexibility. In September, Oslo averages a high of 16°C (61°F) and a low of 10°C (49°F), with 104mm of rainfall across roughly 12 rainy days.
Q02How warm does Oslo get in September?
How warm does Oslo get in September?
The average high temperature in Oslo during September is 16°C (61°F), with an average low of 10°C (49°F). These figures are averaged from 11 complete years of daily records (2015–2025, Open-Meteo Archive).
Q03Does it rain a lot in Oslo in September?
Does it rain a lot in Oslo in September?
Oslo averages approximately 12 rainy days in September, with a total monthly rainfall of about 104mm. This is based on daily precipitation records where days with 1mm or more of rain are counted as rainy days.
Q04What clothes should I bring to Oslo in September?
What clothes should I bring to Oslo in September?
For Oslo in September, pack layered clothing for changing temperatures, a merino base layer for evenings, a compact umbrella or waterproof jacket, comfortable walking shoes. These recommendations are based on 11 complete years of weather averages for this specific month.
Q05Are there many tourists in Oslo in September?
Are there many tourists in Oslo in September?
Tourist crowds in Oslo during September are typically moderate — shoulder season, a sweet spot between crowds and weather. Consider this when planning accommodation — prices track crowd levels closely.