S
M
T
W
T
F
S
30
68°
61°
31
66°
55°
1
70°
52°
2
68°
54°
3
64°
55°
4
63°
55°
5
62°
48°
6
61°
45°
7
66°
52°
8
68°
56°
9
63°
53°
10
62°
51°
11
63°
50°
12
64°
51°
13
61°
49°
14
61°
50°
15
59°
46°
16
60°
47°
17
61°
49°
18
57°
46°
19
61°
46°
20
60°
45°
21
61°
45°
22
59°
46°
23
56°
45°
24
60°
44°
25
60°
46°
26
59°
45°
27
58°
43°
28
52°
40°
29
50°
38°
30
50°
39°
1
49°
38°
2
51°
37°
3
54°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Viljandi
Viljandi's September 2026 forecast shows daily high temperatures ranging from 49° to 68°, with overnight lows between 37° and 56°. The average high for September is 59° 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 Viljandi. See also: October | November | December.
