S
M
T
W
T
F
S
30
84°
72°
31
85°
72°
1
85°
71°
2
84°
71°
3
84°
70°
4
83°
71°
5
84°
67°
6
84°
71°
7
83°
71°
8
84°
70°
9
84°
71°
10
83°
71°
11
84°
70°
12
83°
71°
13
84°
72°
14
85°
71°
15
84°
70°
16
84°
71°
17
85°
70°
18
84°
71°
19
84°
70°
20
84°
71°
21
84°
71°
22
85°
72°
23
Hist. Avg.
83°
70°
24
Hist. Avg.
83°
70°
25
Hist. Avg.
83°
70°
26
Hist. Avg.
83°
70°
27
Hist. Avg.
83°
70°
28
Hist. Avg.
83°
70°
29
Hist. Avg.
83°
70°
30
Hist. Avg.
83°
70°
1
Hist. Avg.
83°
69°
2
Hist. Avg.
83°
69°
3
Hist. Avg.
83°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Hilo
Hilo's September 2026 forecast shows daily high temperatures ranging from 83° 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.
