S
M
T
W
T
F
S
30
68°
56°
31
79°
53°
1
73°
52°
2
76°
58°
3
70°
53°
4
70°
48°
5
74°
54°
6
76°
48°
7
68°
53°
8
75°
56°
9
77°
50°
10
71°
50°
11
69°
49°
12
76°
51°
13
72°
53°
14
71°
47°
15
76°
49°
16
81°
51°
17
82°
52°
18
81°
53°
19
72°
51°
20
70°
49°
21
69°
50°
22
71°
50°
23
68°
46°
24
65°
50°
25
62°
49°
26
62°
48°
27
63°
44°
28
60°
43°
29
60°
41°
30
61°
42°
1
60°
48°
2
61°
48°
3
60°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lynden
Lynden's September 2026 forecast shows daily high temperatures ranging from 60° to 82°, with overnight lows between 41° and 53°. The average high for September is 68° with an average low of 48°. 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 Lynden. See also: October | November | December.
