S
M
T
W
T
F
S
28
65°
44°
29
73°
42°
30
73°
53°
31
63°
57°
1
62°
49°
2
66°
46°
3
61°
54°
4
56°
46°
5
59°
46°
6
64°
47°
7
64°
46°
8
57°
43°
9
61°
38°
10
64°
35°
11
73°
46°
12
67°
48°
13
68°
54°
14
78°
52°
15
82°
49°
16
71°
42°
17
76°
41°
18
74°
48°
19
69°
46°
20
71°
45°
21
63°
45°
22
62°
50°
23
59°
44°
24
64°
48°
25
65°
41°
26
70°
44°
27
71°
38°
28
71°
44°
29
78°
52°
30
81°
48°
31
82°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
January Weather in Arroyo Grande
Arroyo Grande's January 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for January is ° with an average low of °. 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 Arroyo Grande. See also: February | March | April.
