S
M
T
W
T
F
S
30
70°
46°
31
71°
48°
1
67°
46°
2
69°
45°
3
68°
44°
4
65°
46°
5
64°
44°
6
63°
42°
7
63°
43°
8
62°
43°
9
63°
41°
10
62°
43°
11
61°
47°
12
62°
48°
13
60°
45°
14
63°
46°
15
60°
44°
16
64°
43°
17
63°
45°
18
59°
47°
19
Hist. Avg.
58°
44°
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 41° and 48°. The average high for September is 64° 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.
