S
M
T
W
T
F
S
30
80°
72°
31
80°
71°
1
81°
72°
2
80°
72°
3
82°
71°
4
80°
70°
5
81°
71°
6
80°
70°
7
80°
70°
8
81°
71°
9
80°
72°
10
80°
72°
11
80°
71°
12
80°
72°
13
79°
72°
14
80°
71°
15
81°
72°
16
81°
72°
17
82°
71°
18
81°
71°
19
80°
70°
20
81°
70°
21
84°
70°
22
83°
69°
23
82°
70°
24
83°
69°
25
82°
70°
26
83°
69°
27
83°
68°
28
82°
69°
29
81°
70°
30
82°
70°
1
83°
69°
2
83°
71°
3
84°
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 79° to 84°, with overnight lows between 68° and 72°. The average high for September is 81° 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.
