S
M
T
W
T
F
S
27
21°
4°
28
19°
-5°
29
20°
-5°
30
19°
-4°
31
14°
-8°
1
12°
-9°
2
11°
-4°
3
11°
4°
4
16°
6°
5
20°
6°
6
25°
5°
7
24°
6°
8
24°
4°
9
23°
4°
10
23°
-1°
11
22°
7°
12
25°
-1°
13
26°
6°
14
24°
5°
15
25°
6°
16
24°
7°
17
26°
9°
18
28°
7°
19
27°
6°
20
26°
1°
21
21°
5°
22
21°
5°
23
25°
-6°
24
24°
-9°
25
13°
3°
26
16°
1°
27
16°
-10°
28
17°
-11°
29
15°
-9°
30
14°
3°
31
17°
7°
1
27°
-5°
2
27°
-7°
3
14°
6°
4
21°
-5°
5
20°
1°
6
14°
9°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
January Weather in Neptune
Neptune's January 2027 forecast shows daily high temperatures ranging from 11° to 28°, with overnight lows between -11° and 9°. The average high for January is 20° with an average low of 1°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how January weather will actually feel in Neptune. See also: February | March | April.
