S
M
T
W
T
F
S
30
70°
48°
31
69°
49°
1
70°
50°
2
65°
45°
3
69°
49°
4
70°
46°
5
71°
47°
6
70°
49°
7
68°
46°
8
66°
48°
9
68°
45°
10
67°
49°
11
68°
43°
12
64°
42°
13
60°
44°
14
61°
40°
15
59°
41°
16
60°
42°
17
59°
41°
18
64°
40°
19
64°
40°
20
Hist. Avg.
58°
44°
21
Hist. Avg.
57°
44°
22
Hist. Avg.
57°
44°
23
Hist. Avg.
56°
43°
24
Hist. Avg.
56°
43°
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 59° to 71°, with overnight lows between 40° and 50°. The average high for September is 66° with an average low of 45°. 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.
