Oslo Weather in September
In September, Oslo averages a high of 15°C (59°F) and a low of 8°C (46°F), based on 55 years of historical weather data from OSLO - BLINDERN PLU.
15°C
Average high
59°F
8°C
Average low
46°F
27°C
Record high
81°F · 2024
-2°C
Record low
28°F · 1990
What to Expect in Oslo in September
Typical September days in Oslo reach 15°C (59°F) during the afternoon and cool to around 8°C (46°F) overnight. On average, measurable rain falls on about 49% of days this month. Over the past 55 years, September temperatures in Oslo have ranged from a record high of 27°C (2024) down to a record low of -2°C (1990).
For a day-by-day look or other months, see the full Oslo weather history.