Verdict: Good month
Oslo Weather in September
September is mild-to-cool in Oslo, topping out near 16°C (61°F) — comfortable with a layer on. Expect showers on roughly 10 days of the month — rarely trip-ruining, worth planning around. Overall, September is a solid month to visit Oslo.
Average high
16°C / 61°F
Average low
9°C / 48°F
Rain days
~10
Precipitation
85 mm
What to pack for Oslo in September
- Layers — t-shirts under a light jacket or sweater
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Oslo: Jun (21°C / 70°F) · Coolest: Jan (0°C / 32°F) · Wettest: Jul (~14 rain days)
0°
-5°
Jan
2°
-4°
Feb
5°
-2°
Mar
10°
1°
Apr
16°
6°
May
21°
12°
Jun
20°
13°
Jul
20°
13°
Aug
16°
9°
Sep
10°
5°
Oct
4°
1°
Nov
0°
-5°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)