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Sønderborg

Town · Southern Denmark Region, 🇩🇰 Denmark
Population 27,595
Area 13 km²
Time zone Europe/Copenhagen
Sønderborg

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Sønderborg Essentials

Sønderborg combines royal heritage with significant military history at the gateway to the island of Als. This selection features the 12th-century Sønderborg Castle and Dybbøl Mill, a national symbol of Danish resilience. The town's identity is shaped by the Alssund waterway, spanned by the historic King Christian X’s Bridge. Cultural highlights include the Alsion Concert Hall, the specialized Ringridermuseet—dedicated to the regional tradition of tilting at the ring—and historic landmarks like Sankt Marie Kirke.

11 places

Sønderborg — Map

Sønderborg — Map

Climate & when to visit

Best time to visit: July

Select a month

Typical weather in January

Poor
  • 4° (feels like -1°) · extremes -6°–9°
  • 0° at night
  • 13 rainy days
  • 0 sunny days
  • 1 hour of sunshine per day
  • Dry air
  • Light breeze
  • UV index 0 · low

Typical weather in February

Poor
  • 5° (feels like -1°) · extremes -6°–10°
  • 0° at night
  • 12 rainy days
  • 2 sunny days
  • 2 hours of sunshine per day
  • Dry air
  • Light breeze
  • UV index 1 · low

Typical weather in March

Poor
  • 7° (feels like 2°) · extremes -4°–13°
  • 1° at night
  • 11 rainy days
  • 6 sunny days
  • 5 hours of sunshine per day
  • Dry air
  • Light breeze
  • UV index 2 · low

Typical weather in April

Poor
  • 11° (feels like 7°) · extremes 0°–18°
  • 4° at night
  • 11 rainy days
  • 9 sunny days
  • 7 hours of sunshine per day
  • Dry air
  • Light breeze
  • UV index 3 · moderate

Typical weather in May

Good
  • 16° (feels like 12°) · extremes 4°–21°
  • 8° at night
  • 12 rainy days
  • 8 sunny days
  • 8 hours of sunshine per day
  • Dry air
  • Light breeze
  • UV index 4 · moderate

Typical weather in June

Good
  • 19° (feels like 17°) · extremes 8°–25°
  • 12° at night
  • 13 rainy days
  • 7 sunny days
  • 8 hours of sunshine per day
  • Dry air
  • Light breeze
  • UV index 5 · moderate

Typical weather in July

Great
  • 21° (feels like 19°) · extremes 11°–27°
  • 14° at night
  • 14 rainy days
  • 5 sunny days
  • 7 hours of sunshine per day
  • Comfortable humidity
  • Light breeze
  • UV index 5 · moderate

Typical weather in August

Good
  • 21° (feels like 19°) · extremes 11°–26°
  • 15° at night
  • 15 rainy days
  • 5 sunny days
  • 6 hours of sunshine per day
  • Comfortable humidity
  • Light breeze
  • UV index 4 · moderate

Typical weather in September

Good
  • 18° (feels like 15°) · extremes 8°–23°
  • 12° at night
  • 12 rainy days
  • 4 sunny days
  • 5 hours of sunshine per day
  • Dry air
  • Light breeze
  • UV index 3 · moderate

Typical weather in October

Fair
  • 13° (feels like 9°) · extremes 3°–17°
  • 9° at night
  • 14 rainy days
  • 3 sunny days
  • 3 hours of sunshine per day
  • Dry air
  • Light breeze
  • UV index 1 · low

Typical weather in November

Poor
  • 8° (feels like 4°) · extremes -1°–13°
  • 5° at night
  • 12 rainy days
  • 0 sunny days
  • 1 hour of sunshine per day
  • Dry air
  • Light breeze
  • UV index 0 · low

Typical weather in December

Poor
  • 5° (feels like 0°) · extremes -5°–10°
  • 2° at night
  • 13 rainy days
  • 0 sunny days
  • 1 hour of sunshine per day
  • Dry air
  • Light breeze
  • UV index 0 · low

Climate data: NASA POWER + Copernicus ERA5-Land · 1996–2025

Practical information

Currency
Danish Krone DKK kr · Card payments · Widely accepted
Emergency numbers
112
Electricity
Type C / Type E / Type F / Type K
230 V · 50 Hz
Languages
Danish
Tap water
Safe to drink
Driving side
Right
Calling code
+45
Learn more

Tours & Activities

Sønderborg Castle
Walk
Dybbøl Mølle
Walk
Kong Christian D. X's Bro

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Related destinations

Southern Denmark Region

Other Destinations

Esbjerg Municipality Vejle Municipality Sønderborg Municipality Esbjerg Kolding Vejle Aabenraa Municipality Fredericia Municipality Vejen Municipality Fredericia Billund Municipality Aabenraa Fanø Municipality Fanø Wadden Sea National Park Langeland Blåvand