S
M
T
W
T
F
S
30
73°
58°
31
73°
60°
1
69°
53°
2
68°
54°
3
70°
52°
4
64°
55°
5
62°
51°
6
62°
50°
7
69°
52°
8
70°
57°
9
64°
55°
10
63°
51°
11
65°
51°
12
63°
52°
13
62°
51°
14
61°
52°
15
60°
50°
16
60°
50°
17
64°
51°
18
60°
52°
19
64°
52°
20
63°
51°
21
62°
51°
22
61°
50°
23
61°
50°
24
62°
49°
25
62°
51°
26
63°
50°
27
58°
48°
28
55°
47°
29
54°
42°
30
53°
42°
1
52°
44°
2
54°
45°
3
55°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Riga
Riga's September 2026 forecast shows daily high temperatures ranging from 52° to 70°, with overnight lows between 42° and 57°. The average high for September is 61° with an average low of 50°. 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 Riga. See also: October | November | December.
