S
M
T
W
T
F
S
30
65°
51°
31
60°
50°
1
58°
49°
2
58°
48°
3
57°
44°
4
59°
44°
5
57°
47°
6
59°
46°
7
58°
45°
8
59°
46°
9
55°
46°
10
55°
44°
11
56°
43°
12
55°
49°
13
60°
49°
14
57°
48°
15
62°
48°
16
61°
49°
17
61°
48°
18
59°
48°
19
59°
49°
20
60°
46°
21
59°
43°
22
58°
40°
23
56°
37°
24
52°
35°
25
49°
36°
26
49°
39°
27
50°
38°
28
50°
38°
29
48°
36°
30
47°
37°
1
47°
41°
2
49°
42°
3
49°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lappeenranta
Lappeenranta's September 2026 forecast shows daily high temperatures ranging from 47° to 65°, with overnight lows between 35° and 51°. The average high for September is 56° with an average low of 44°. 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 Lappeenranta. See also: October | November | December.
