21.07
tue
tue
Day
64°F
SE 16 mph
Precip.
8%
8%
Night
50°F
S 5 mph
Precip.
6%
6%
22.07
wed
wed
Day
70°F
SE 4 mph
Precip.
2%
2%
Night
59°F
E 4 mph
Precip.
7%
7%
23.07
thu
thu
Day
79°F
NE 8 mph
Precip.
3%
3%
Night
66°F
NE 7 mph
Precip.
27%
27%
24.07
fri
fri
Day
81°F
NE 11 mph
Precip.
2%
2%
Night
70°F
NE 12 mph
Precip.
5%
5%
25.07
sat
sat
Day
81°F
NE 12 mph
Precip.
3%
3%
Night
73°F
NE 12 mph
Precip.
9%
9%
26.07
sun
sun
Day
88°F
W 3 mph
Precip.
2%
2%
Night
63°F
SW 11 mph
Precip.
22%
22%
27.07
mon
mon
Day
66°F
W 12 mph
Precip.
9%
9%
Night
57°F
SW 7 mph
Precip.
8%
8%
28.07
tue
tue
Day
70°F
W 11 mph
Precip.
2%
2%
Night
59°F
SW 6 mph
Precip.
76%
76%
29.07
wed
wed
Day
66°F
W 6 mph
Precip.
55%
55%
Night
63°F
SW 5 mph
Precip.
42%
42%
30.07
thu
thu
Day
64°F
SW 11 mph
Precip.
80%
80%
Night
61°F
NE 4 mph
Precip.
25%
25%
31.07
fri
fri
Day
72°F
E 11 mph
Precip.
3%
3%
Night
57°F
SE 5 mph
Precip.
8%
8%
01.08
sat
sat
Day
70°F
NE 1 mph
Precip.
3%
3%
Night
59°F
SW 8 mph
Precip.
22%
22%
02.08
sun
sun
Day
68°F
SW 12 mph
Precip.
17%
17%
Night
66°F
SE 14 mph
Precip.
9%
9%
03.08
mon
mon
Day
68°F
SE 14 mph
Precip.
3%
3%
Night
61°F
SE 7 mph
Precip.
5%
5%
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 65.0°F. The highest and lowest sea temperatures during the month were 73.2°F and 54.5°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 67.5°F. The highest and lowest sea temperatures during the month were 71.1°F and 62.6°F.
Air temperature in Duluth, °F
Precipitation total in Duluth, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 08:40
July 21, tuesday
0900
63°F
SE
14 mph
14 mph
1200
64°F
SE
16 mph
16 mph
1500
66°F
S
14 mph
14 mph
1800
70°F
S
12 mph
12 mph
2100
59°F
SW
12 mph
12 mph
July 22, wednesday
0000
50°F
S
5 mph
5 mph
0300
48°F
SE
5 mph
5 mph
0600
46°F
SE
5 mph
5 mph
