S
M
T
W
T
F
S
30
84°
70°
31
83°
70°
1
83°
69°
2
84°
71°
3
84°
71°
4
83°
72°
5
84°
72°
6
84°
71°
7
83°
71°
8
84°
70°
9
84°
71°
10
83°
71°
11
84°
70°
12
83°
70°
13
84°
71°
14
84°
70°
15
83°
71°
16
83°
71°
17
84°
70°
18
84°
71°
19
83°
71°
20
84°
70°
21
85°
71°
22
84°
71°
23
84°
67°
24
83°
71°
25
84°
71°
26
84°
70°
27
83°
71°
28
84°
71°
29
84°
70°
30
82°
71°
1
83°
70°
2
84°
71°
3
83°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hilo
Hilo's September 2026 forecast shows daily high temperatures ranging from 82° to 85°, with overnight lows between 67° and 72°. The average high for September is 84° with an average low of 71°. 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 Hilo. See also: October | November | December.
