S
M
T
W
T
F
S
30
72°
45°
31
71°
45°
1
66°
49°
2
70°
50°
3
70°
49°
4
71°
48°
5
69°
48°
6
68°
47°
7
68°
48°
8
67°
47°
9
67°
48°
10
62°
47°
11
66°
45°
12
66°
46°
13
65°
47°
14
64°
44°
15
60°
42°
16
62°
46°
17
63°
45°
18
61°
46°
19
59°
45°
20
61°
43°
21
62°
42°
22
62°
46°
23
58°
44°
24
61°
45°
25
Hist. Avg.
56°
43°
26
Hist. Avg.
55°
43°
27
Hist. Avg.
55°
42°
28
Hist. Avg.
54°
42°
29
Hist. Avg.
54°
42°
30
Hist. Avg.
54°
42°
1
Hist. Avg.
53°
41°
2
Hist. Avg.
53°
41°
3
Hist. Avg.
53°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Oslo
Oslo's September 2026 forecast shows daily high temperatures ranging from 58° to 72°, with overnight lows between 42° and 50°. The average high for September is 65° with an average low of 46°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Oslo. See also: October | November | December.
