S
M
T
W
T
F
S
30
81°
66°
31
79°
63°
1
79°
64°
2
86°
63°
3
104°
66°
4
88°
75°
5
97°
73°
6
90°
68°
7
86°
66°
8
N/A
9
76°
63°
10
81°
63°
11
84°
63°
12
90°
69°
13
94°
69°
14
87°
68°
15
84°
68°
16
81°
66°
17
77°
65°
18
78°
68°
19
80°
67°
20
81°
68°
21
80°
67°
22
79°
66°
23
79°
67°
24
78°
67°
25
79°
66°
26
79°
67°
27
78°
67°
28
76°
66°
29
78°
66°
30
78°
65°
1
76°
66°
2
75°
66°
3
75°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Oeiras
Oeiras's September 2026 forecast shows daily high temperatures ranging from 75° to 94°, with overnight lows between 63° and 69°. The average high for September is 80° with an average low of 66°. 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 Oeiras. See also: October | November | December.
