S
M
T
W
T
F
S
30
68°
59°
31
70°
60°
1
72°
58°
2
73°
56°
3
70°
54°
4
68°
57°
5
70°
56°
6
69°
52°
7
69°
58°
8
70°
55°
9
69°
56°
10
66°
53°
11
64°
51°
12
64°
50°
13
65°
53°
14
63°
54°
15
63°
56°
16
68°
55°
17
68°
56°
18
69°
54°
19
68°
49°
20
66°
51°
21
63°
51°
22
62°
50°
23
62°
50°
24
61°
48°
25
61°
54°
26
62°
53°
27
67°
50°
28
64°
46°
29
61°
47°
30
60°
49°
1
61°
48°
2
60°
47°
3
61°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rotterdam
Rotterdam's September 2026 forecast shows daily high temperatures ranging from 60° to 73°, with overnight lows between 46° and 60°. The average high for September is 66° with an average low of 53°. 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 Rotterdam. See also: October | November | December.
