S
M
T
W
T
F
S
30
85°
70°
31
81°
72°
1
84°
73°
2
85°
75°
3
80°
71°
4
83°
71°
5
85°
69°
6
82°
73°
7
83°
73°
8
89°
72°
9
85°
74°
10
81°
72°
11
83°
71°
12
84°
72°
13
84°
72°
14
83°
68°
15
86°
73°
16
85°
70°
17
83°
77°
18
85°
74°
19
83°
73°
20
85°
72°
21
84°
72°
22
84°
72°
23
84°
74°
24
81°
73°
25
80°
74°
26
80°
74°
27
81°
71°
28
85°
71°
29
84°
72°
30
85°
71°
1
84°
72°
2
84°
70°
3
85°
72°
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 80° to 85°, with overnight lows between 70° and 74°. The average high for September is 84° with an average low of 72°. 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.
