Sønderborg monthly weather forecast
Monthly weather forecast for Sønderborg. ℃ Average temperatures % Humidity, precipitation ️ Sunrise and sunset ️ Wind direction and speed
31 August 2026, Monday
+15°C / +19°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+17°C
9
91%
1008
01:00
+16°C
10.4
92%
1008
02:00
+16°C
7.2
95%
1008
03:00
+16°C
9.7
94%
1007
04:00
+17°C
11.5
94%
1007
05:00
+17°C
11.5
97%
1006
06:00
+17°C
15.8
100%
1006
07:00
+16°C
16.2
99%
1005
08:00
+17°C
13.7
93%
1005
09:00
+17°C
13.3
95%
1005
10:00
+17°C
19.4
93%
1004
11:00
+17°C
20.5
87%
1004
12:00
+17°C
20.2
86%
1004
13:00
+18°C
23
85%
1004
14:00
+18°C
23.4
85%
1004
15:00
+19°C
22.7
90%
1004
16:00
+19°C
23.8
84%
1004
17:00
+18°C
21.6
92%
1004
18:00
+18°C
11.5
84%
1004
19:00
+18°C
9.7
85%
1005
20:00
+17°C
11.2
93%
1005
21:00
+17°C
9.4
94%
1005
22:00
+16°C
10.4
95%
1006
23:00
+15°C
9.4
96%
1006
01 September 2026, Tuesday
+15°C / +20°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+15°C
10.1
97%
1006
01:00
+15°C
11.2
97%
1007
02:00
+15°C
13.3
97%
1007
03:00
+16°C
14.8
96%
1007
04:00
+16°C
15.5
95%
1008
05:00
+16°C
15.1
94%
1008
06:00
+16°C
13
93%
1009
07:00
+16°C
11.5
93%
1009
08:00
+16°C
13
92%
1009
09:00
+16°C
16.6
93%
1009
10:00
+17°C
19.4
91%
1010
11:00
+18°C
23
87%
1010
12:00
+19°C
20.5
82%
1011
13:00
+19°C
21.2
80%
1011
14:00
+20°C
20.5
79%
1012
15:00
+20°C
18
75%
1012
16:00
+20°C
22.3
82%
1012
17:00
+19°C
21.2
82%
1012
18:00
+19°C
20.9
82%
1013
19:00
+18°C
23
80%
1013
20:00
+17°C
20.9
77%
1013
21:00
+16°C
18
81%
1014
22:00
+15°C
17.3
83%
1014
23:00
+15°C
13.3
84%
1015
02 September 2026, Wednesday
+15°C / +20°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+15°C
10.8
85%
1015
01:00
+15°C
10.8
85%
1014
02:00
+15°C
10.8
85%
1014
03:00
+15°C
11.5
85%
1014
04:00
+15°C
12.6
86%
1014
05:00
+15°C
11.5
89%
1014
06:00
+15°C
12.2
90%
1014
07:00
+15°C
14.4
89%
1014
08:00
+16°C
16.6
88%
1014
09:00
+17°C
19.1
86%
1014
10:00
+18°C
21.6
84%
1014
11:00
+19°C
22.3
89%
1014
12:00
+19°C
27.7
89%
1014
13:00
+19°C
27.4
83%
1015
14:00
+20°C
25.2
79%
1014
15:00
+20°C
19.4
81%
1014
16:00
+20°C
20.2
77%
1014
17:00
+20°C
21.6
75%
1014
18:00
+19°C
19.8
75%
1014
19:00
+18°C
17.1
81%
1014
20:00
+17°C
13.9
87%
1014
21:00
+16°C
13.4
93%
1014
22:00
+15°C
12.2
95%
1014
23:00
+15°C
13.2
95%
1014
03 September 2026, Thursday
+14°C / +20°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+15°C
13.4
95%
1014
01:00
+14°C
13.8
96%
1014
02:00
+15°C
15.4
97%
1014
03:00
+15°C
15.7
96%
1013
04:00
+15°C
13.9
96%
1013
05:00
+15°C
15.2
96%
1012
06:00
+15°C
18.6
95%
1011
07:00
+15°C
19.8
96%
1011
08:00
+15°C
20
97%
1010
09:00
+15°C
23.5
95%
1010
10:00
+16°C
27
95%
1009
11:00
+17°C
23.3
95%
1008
12:00
+19°C
20.5
90%
1008
13:00
+18°C
22.5
90%
1008
14:00
+20°C
26
82%
1008
15:00
+20°C
25.3
79%
1008
16:00
+19°C
25.8
79%
1008
17:00
+20°C
23.5
83%
1008
18:00
+19°C
22.8
79%
1008
19:00
+18°C
21.9
83%
1009
20:00
+17°C
19.6
89%
1009
21:00
+17°C
18.6
89%
1009
22:00
+16°C
17.5
90%
1010
23:00
+16°C
16.9
90%
1010
04 September 2026, Friday
+15°C / +20°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+16°C
16.3
91%
1010
01:00
+16°C
16.1
91%
1010
02:00
+16°C
15.9
91%
1010
03:00
+16°C
16.2
90%
1010
04:00
+16°C
16.8
88%
1009
05:00
+16°C
17.1
87%
1009
06:00
+16°C
16.2
89%
1008
07:00
+16°C
16.9
91%
1007
08:00
+16°C
20
93%
1005
09:00
+17°C
27.6
95%
1004
10:00
+18°C
38.8
97%
1002
11:00
+19°C
43.8
95%
1001
12:00
+19°C
35.6
87%
1001
13:00
+20°C
24.7
78%
1002
14:00
+20°C
22.9
71%
1004
15:00
+20°C
22.4
68%
1004
16:00
+20°C
21.4
65%
1005
17:00
+19°C
21.3
66%
1006
18:00
+18°C
19.3
69%
1006
19:00
+18°C
16.4
76%
1006
20:00
+17°C
14.7
82%
1007
21:00
+16°C
15.1
86%
1007
22:00
+16°C
16.6
88%
1007
23:00
+15°C
17.5
89%
1008
05 September 2026, Saturday
+14°C / +19°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+15°C
17
87%
1008
01:00
+15°C
15.9
83%
1008
02:00
+15°C
15
80%
1008
03:00
+15°C
14.5
81%
1009
04:00
+14°C
14.3
82%
1009
05:00
+14°C
14.5
83%
1009
06:00
+15°C
14.6
83%
1009
07:00
+15°C
14.9
82%
1010
08:00
+16°C
16.1
80%
1010
09:00
+16°C
19.1
74%
1011
10:00
+18°C
23.4
68%
1011
11:00
+18°C
26.9
64%
1012
12:00
+19°C
28.7
62%
1012
13:00
+19°C
29.5
61%
1013
14:00
+19°C
29.7
61%
1014
15:00
+19°C
29.5
62%
1014
16:00
+19°C
28.6
63%
1015
17:00
+18°C
27.2
65%
1015
18:00
+17°C
24.5
69%
1016
19:00
+16°C
21.3
74%
1016
20:00
+16°C
18.4
78%
1017
21:00
+15°C
16.4
81%
1017
22:00
+15°C
14.7
83%
1017
23:00
+14°C
13.3
85%
1018
06 September 2026, Sunday
+13°C / +18°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+14°C
11.9
88%
1018
01:00
+14°C
10.7
89%
1018
02:00
+13°C
9.7
91%
1018
03:00
+13°C
8.8
91%
1018
04:00
+13°C
8.3
92%
1018
05:00
+14°C
7.9
92%
1018
06:00
+14°C
7.5
92%
1018
07:00
+14°C
7.3
91%
1018
08:00
+14°C
7.3
89%
1018
09:00
+15°C
7.5
87%
1018
10:00
+15°C
8.2
83%
1017
11:00
+16°C
9
79%
1017
12:00
+17°C
9.7
75%
1017
13:00
+17°C
10.2
72%
1017
14:00
+18°C
10.3
71%
1016
15:00
+18°C
9.8
71%
1016
16:00
+18°C
8.9
73%
1016
17:00
+17°C
7.7
75%
1015
18:00
+17°C
6.5
78%
1014
19:00
+17°C
5.7
80%
1014
20:00
+16°C
5.7
82%
1013
21:00
+16°C
6.9
82%
1013
22:00
+16°C
9
82%
1012
23:00
+17°C
11.9
82%
1011
07 September 2026, Monday
+14°C / +21°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+17°C
14.8
82%
1011
01:00
+17°C
16.7
82%
1010
02:00
+17°C
17.7
83%
1009
03:00
+17°C
17.1
84%
1009
04:00
+17°C
15.7
87%
1009
05:00
+17°C
14.1
91%
1008
06:00
+18°C
13.2
94%
1008
07:00
+18°C
13.7
95%
1008
08:00
+18°C
15
95%
1008
09:00
+19°C
16.9
93%
1008
10:00
+19°C
19.4
88%
1008
11:00
+20°C
22
83%
1008
12:00
+20°C
24.3
78%
1008
13:00
+21°C
25.9
74%
1009
14:00
+21°C
26.7
73%
1009
15:00
+20°C
26
73%
1009
16:00
+20°C
24.5
74%
1010
17:00
+19°C
22.1
76%
1010
18:00
+18°C
19.7
79%
1011
19:00
+17°C
17.4
81%
1011
20:00
+16°C
15.5
83%
1011
21:00
+15°C
14.1
85%
1012
22:00
+15°C
12.5
87%
1012
23:00
+14°C
11.2
89%
1012
08 September 2026, Tuesday
+13°C / +18°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+14°C
9.6
90%
1013
01:00
+13°C
8.4
92%
1013
02:00
+13°C
7.2
93%
1013
03:00
+13°C
6.2
94%
1013
04:00
+13°C
5.5
95%
1013
05:00
+13°C
5.3
96%
1013
06:00
+13°C
5.4
97%
1012
07:00
+13°C
6
97%
1012
08:00
+13°C
6.8
98%
1012
09:00
+14°C
8.1
97%
1011
10:00
+14°C
10.2
96%
1011
11:00
+15°C
12.6
95%
1010
12:00
+15°C
15.1
95%
1009
13:00
+16°C
16.7
93%
1009
14:00
+16°C
17.2
93%
1008
15:00
+16°C
16.1
93%
1008
16:00
+17°C
13.8
92%
1007
17:00
+17°C
12.2
93%
1006
18:00
+18°C
11.9
93%
1006
19:00
+18°C
13.2
93%
1005
20:00
+18°C
14.7
93%
1005
21:00
+18°C
15.4
94%
1004
22:00
+18°C
15.7
94%
1004
23:00
+18°C
15.7
94%
1003
09 September 2026, Wednesday
+17°C / +20°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+18°C
15.9
95%
1003
01:00
+17°C
16.1
95%
1002
02:00
+17°C
16.5
95%
1002
03:00
+17°C
17
96%
1001
04:00
+17°C
17.6
97%
1001
05:00
+17°C
18.3
98%
1001
06:00
+17°C
19
98%
1000
07:00
+17°C
19.9
97%
1000
08:00
+17°C
20.6
94%
999
09:00
+18°C
21.4
89%
999
10:00
+18°C
22.4
82%
999
11:00
+19°C
23.7
75%
1000
12:00
+19°C
25
68%
1000
13:00
+19°C
26.2
62%
1000
14:00
+20°C
26.7
59%
1000
15:00
+19°C
26.6
58%
1000
16:00
+19°C
26
58%
1000
17:00
+19°C
25.1
59%
1000
18:00
+18°C
24.1
60%
1001
19:00
+17°C
23.4
62%
1001
20:00
+17°C
23
64%
1001
21:00
+17°C
22.8
66%
1001
22:00
+17°C
22.7
68%
1001
23:00
+17°C
22.7
71%
1001
10 September 2026, Thursday
+14°C / +20°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+16°C
22.8
74%
1001
01:00
+16°C
22.9
76%
1000
02:00
+16°C
22.9
79%
1000
03:00
+16°C
22.8
81%
1000
04:00
+16°C
22.8
83%
1000
05:00
+16°C
23
86%
1000
06:00
+16°C
22.9
88%
1000
07:00
+16°C
22.8
88%
1000
08:00
+16°C
22.7
86%
1001
09:00
+16°C
22.7
82%
1001
10:00
+17°C
22.8
76%
1001
11:00
+18°C
23.6
69%
1002
12:00
+19°C
24.7
63%
1002
13:00
+19°C
25.7
59%
1003
14:00
+20°C
25.8
57%
1003
15:00
+19°C
24.7
58%
1003
16:00
+19°C
22.8
60%
1004
17:00
+18°C
20.3
65%
1004
18:00
+17°C
17.7
70%
1004
19:00
+16°C
15.2
75%
1004
20:00
+15°C
13.6
79%
1005
21:00
+15°C
12.7
82%
1005
22:00
+14°C
12
84%
1005
23:00
+14°C
11.9
85%
1006
11 September 2026, Friday
+12°C / +17°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+13°C
11.9
86%
1006
01:00
+13°C
11.9
87%
1006
02:00
+13°C
11.6
88%
1007
03:00
+13°C
11.1
88%
1007
04:00
+12°C
10.4
89%
1007
05:00
+12°C
9.5
90%
1007
06:00
+12°C
8.9
90%
1008
07:00
+12°C
8.5
89%
1008
08:00
+13°C
8.3
86%
1008
09:00
+13°C
8.4
81%
1009
10:00
+14°C
8.9
74%
1009
11:00
+15°C
9.4
66%
1009
12:00
+16°C
10.2
60%
1010
13:00
+17°C
10.7
55%
1010
14:00
+17°C
10.9
53%
1010
15:00
+17°C
10.7
52%
1011
16:00
+17°C
10.1
54%
1010
17:00
+16°C
9.2
56%
1010
18:00
+15°C
8.4
59%
1010
19:00
+15°C
7.9
62%
1010
20:00
+14°C
7.8
65%
1010
21:00
+14°C
8.3
67%
1010
22:00
+14°C
9.3
69%
1010
23:00
+14°C
10.7
71%
1010
12 September 2026, Saturday
+12°C / +16°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+14°C
11.8
73%
1010
01:00
+13°C
12.7
75%
1010
02:00
+13°C
13.3
77%
1010
03:00
+13°C
13.3
80%
1010
04:00
+13°C
13
83%
1010
05:00
+12°C
12.6
85%
1009
06:00
+12°C
12.3
88%
1009
07:00
+12°C
11.9
89%
1009
08:00
+12°C
11.6
89%
1009
09:00
+13°C
11.2
86%
1010
10:00
+13°C
10.5
82%
1010
11:00
+14°C
9.8
77%
1011
12:00
+15°C
8.9
72%
1012
13:00
+16°C
8.1
68%
1012
14:00
+16°C
7.4
67%
1013
15:00
+16°C
6.6
67%
1013
16:00
+16°C
5.9
69%
1014
17:00
+16°C
5.2
72%
1014
18:00
+15°C
4.5
76%
1014
19:00
+15°C
3.9
79%
1014
20:00
+14°C
3.3
82%
1015
21:00
+14°C
2.9
84%
1015
22:00
+13°C
2.5
86%
1015
23:00
+12°C
2.2
87%
1016
13 September 2026, Sunday
+9°C / +17°C
Hour
Temperature
Wind (km/h)
Humidity
Weather
Pressure
00:00
+12°C
2
89%
1016
01:00
+11°C
1.8
90%
1016
02:00
+11°C
1.6
91%
1017
03:00
+10°C
1.8
93%
1017
04:00
+10°C
2.3
93%
1017
05:00
+9°C
3.1
94%
1017
06:00
+9°C
3.8
95%
1017
07:00
+9°C
4.1
94%
1018
08:00
+9°C
3.8
92%
1018
09:00
+10°C
2.5
88%
1018
10:00
+12°C
0.7
82%
1018
11:00
+13°C
2.3
75%
1018
12:00
+15°C
4.8
70%
1019
13:00
+17°C
6.8
66%
1019
14:00
+17°C
8
64%
1019
15:00
+17°C
8.1
64%
1019
16:00
+17°C
7.5
66%
1019
17:00
+16°C
6.6
70%
1019
18:00
+15°C
5.7
74%
1019
19:00
+14°C
5.4
77%
1018
20:00
+14°C
5.3
80%
1018
21:00
+14°C
5.6
81%
1018
22:00
+13°C
6.1
81%
1018
23:00
+13°C
6.5
81%
1018
Climate Characteristics of Sønderborg
General Overview
Sønderborg features a temperate oceanic climate. Due to its relatively southern location and its position on the Baltic Sea (which is more sheltered than the North Sea), the climate here is considered one of the mildest and most pleasant in Denmark. The city enjoys less freezing winters and slightly warmer summers than the north of the country.
Summer Season (June to August)
Summer in Sønderborg is the most popular time for visiting. Daytime temperatures range between 20°C and 23°C (68-73°F). This is a perfect time for visiting Sønderborg Castle or sailing in the bay, as the water here tends to be calmer and warmer than the Danish average. The Baltic Sea breeze is soft and very pleasant.
Winter Season (December to February)
Winter is relatively mild but humid and grey. Daytime temperatures range around 3°C to 5°C (37-41°F). Due to the proximity to water, snow falls but rarely accumulates in large amounts for long. Southerly and easterly winds can occasionally bring piercing cold from the European continent.
Precipitation and Wind
Precipitation is distributed throughout the year, with autumn typically being the wettest season. Winds in Sønderborg are calmer than in West Coast cities (like Esbjerg), making outdoor activities more enjoyable during transition months.
Weather in Sønderborg by Month
January
The coldest but relatively mild month. 3°C (37°F) daytime. Cloudy skies and high humidity.
February
Wintry and cool (3°C/37°F daytime). Short days and chance of light snow or sleet.
March
Start of spring. 7°C (45°F) daytime. Temperatures rise, and the city starts coming to life.
April
Volatile (12°C/54°F daytime). Sunny days alongside sudden showers. Blooming in gardens begins.
May
A lovely month. 16°C (61°F) daytime. Temperatures are comfortable for walking, and the air is fresh.
June
Incredibly long days. 20°C (68°F) daytime. Ideal time for tours in the historical harbor and nearby beaches.
July
The warmest month. 22°C (72°F) daytime. Perfect for outdoor activities and picnics in green areas around the city.
August
Warm and pleasant (21°C/70°F daytime). Relatively rainy month but sea temperatures are at their highest.
September
Start of autumn. 17°C (63°F) daytime. Weather remains very comfortable for walking tours.
October
Autumnal and colorful. 12°C (54°F) daytime. Beautiful fall foliage around the castle and in parks.
November
Grey, humid, and cool. 7°C (45°F) daytime. Darkness falls early, and rain is more frequent.
December
Wintry and festive. 4°C (39°F) daytime. Christmas atmosphere in the old town offsets the cold.