AI-generatedSønderborg at a glance
- Best time
- Jul – Aug
- Warmest month
- Jul · 21°
- Warmest sea
- Aug · 18.6°
- Sunshine a year
- 1,720 h
- Rain a year
- 671 mm
- Climate
- Maritime
- Time zone
- UTC+1 / UTC+2
- Elevation
- 15 m
Climate in Sønderborg
Sønderborg has a maritime climate with moderate summers and cool, often grey winters. July is the warmest month with average highs of 21 °C, while January is the coolest at 4 °C. With around 1,720 hours of sunshine a year, Sønderborg is moderately sunny; May is the sunniest month with 8.0 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: July – August
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 9°
- Midday, 13:00: about 12°
- Afternoon, 16:00: about 13°
- Evening, 20:00: about 11°
- Night, 23:00: about 10°
07:4818:25
Cold evenings: bring a warm jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:25–08:38 · evening 17:35–18:47
- Blue hour
- Morning 07:11–07:25 · evening 18:47–19:01
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Sønderborg in October?
In October, Sønderborg is cool: daytime highs average 13 °C, and nights cool down to about 9 °C. The sea averages 12.8 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 13 rainy days and 65 mm in total. All in all, October is not an ideal month for a holiday in Sønderborg.
More details for October
- Daylight
- 10 h 37 min07:48 – 18:25
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 25 km/haverage daily peakAll months
- Cloud cover
- 72 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+2Europe/Copenhagen
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %7 %
- Few rainy daysweight 20 %38 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Sea temperature in Sønderborg
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 11.8 – 13.8 °C
Swimming season: Never above 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Sønderborg ranges from 2.3 °C in February to 18.6 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea warms up slowly: it is warmest in August, while the air already peaks in July. In November the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 17.4 and 19.8 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 3.1° | 0.9° | 5.1° | cold |
| FebruaryFeb | 2.3° | 1.0° | 4.0° | cold |
| MarchMar | 3.2° | 1.8° | 4.9° | cold |
| AprilApr | 5.6° | 1.9° | 7.8° | cold |
| MayMay | 11.1° | 10.0° | 12.4° | cold |
| JuneJun | 15.3° | 13.8° | 16.5° | cold |
| JulyJul | 17.8° | 16.1° | 19.8° | fresh |
| AugustAug | 18.6° | 17.4° | 19.8° | fresh |
| SeptemberSep | 16.4° | 15.2° | 17.6° | cold |
| OctoberOct | 12.8° | 11.8° | 13.8° | cold |
| NovemberNov | 9.1° | 7.7° | 10.5° | cold |
| DecemberDec | 4.9° | 1.8° | 6.8° | cold |
Sunshine hours in Sønderborg
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 3.4 of 10.6 hours of daylight in Sønderborg, 32 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Sønderborg
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 1 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 7).
Minutes until sunburn in October
- Very fair skin
- about 90 min
- Fair skin
- about 115 min
- Light brown skin
- over 2 h
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Sønderborg: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Sønderborg has about 13 rainy days with 65 mm of rain in total.
Wind and clouds in Sønderborg
How breezy and how cloudy Sønderborg is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Sønderborg typically peaks at 25 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting, and here it gets there all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 72 % of the sky over Sønderborg: mostly cloudy, with about 3.4 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Snow in Sønderborg
Snow is possible in Sønderborg, but no month makes it likely: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, it hardly ever snows in Sønderborg.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Sønderborg
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
CoolOctober: nights around 9°. A duvet at night and a jumper for the evening.
The coolest nights are in January (0°), the warmest in August (15°). Nights are pleasant for sleeping (15 to 20 °C) in August. Nights fall below 8 °C on average from November to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 9 | 4° | 0° | 3.1° | 1.4 h | 12 | 55 |
| FebruaryFeb | 12 | 5° | 0° | 2.3° | 2.3 h | 10 | 48 |
| MarchMar | 16 | 7° | 1° | 3.2° | 4.1 h | 10 | 43 |
| AprilApr | 24 | 11° | 4° | 5.6° | 6.5 h | 10 | 42 |
| MayMay | 27 | 16° | 8° | 11.1° | 8.0 h | 11 | 54 |
| JuneJun | 25 | 19° | 12° | 15.3° | 7.8 h | 11 | 64 |
| JulyJul | 36 | 21° | 14° | 17.8° | 7.9 h | 13 | 71 |
| AugustAug | 37 | 21° | 15° | 18.6° | 6.9 h | 12 | 67 |
| SeptemberSep | 19 | 17° | 12° | 16.4° | 5.1 h | 10 | 54 |
| OctoberOct | 9 | 13° | 9° | 12.8° | 3.4 h | 13 | 65 |
| NovemberNov | 9 | 8° | 5° | 9.1° | 1.8 h | 11 | 51 |
| DecemberDec | 9 | 5° | 2° | 4.9° | 1.1 h | 12 | 56 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
54.91° N, 9.79° E · 15 m · Europe/Copenhagen
Best time to visit Sønderborg
The best time to visit Sønderborg is from July to August. The sea stays too cool for a classic beach holiday: even in August it only reaches 18.6 °C. For sightseeing, day trips and hiking, conditions are most comfortable from May to June and in September. Rain is most frequent from July to August and in October; the wettest month is July with 71 mm.
Sønderborg through the seasons
How the weather changes over the seasons, with averages for each.
Sønderborg in spring
Mar – May
Poor
- 7–16 °C by day
- Sea 7 °C
- 6 h of sun a day
- 30 rainy days in all
Sønderborg in summer
Jun – Aug
Poor
- 19–21 °C by day
- Sea 17 °C
- 8 h of sun a day
- 37 rainy days in all
Sønderborg in autumn
Sep – Nov
Poor
- 8–17 °C by day
- Sea 13 °C
- 3 h of sun a day
- 34 rainy days in all
Sønderborg in winter
Dec – Feb
Poor
- 4–5 °C by day
- Sea 3 °C
- 2 h of sun a day
- 33 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Sønderborg for you.
Your best months: June – August
Based on the climate averages; tap a month to see its details.
Compare two months in Sønderborg
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
August has the better holiday weather in Sønderborg: score 37 against 9. In August, days are 8 °C warmer than in October. The sea is 6 °C warmer in August. August has one rainy day fewer. The sun shines 4 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Weather score | 9 | 37better |
| Day high | 13° | 21° |
| Night low | 9° | 15° |
| Sea | 12.8° | 18.6° |
| Sunshine | 3.4 h | 6.9 hbetter |
| Rainy days | 13 | 12better |
| Rainfall | 65 mm | 67 mm |
| Muggy days | 0better | 1 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
May – Jun, Sep
15–28 °C and not too much rain
Rainy months
Jul – Aug, Oct
12 or more rainy days
Snow
Jan – Feb
Snow on 2 or more days
Sønderborg month by month
The typical weather for every month at a glance.
9January4° · Sea 3° · 1 h
In January, Sønderborg is cold: daytime highs average 4 °C, and nights cool down to about 0 °C. The sea averages 3.1 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Precipitation, often as snow, falls on about 12 days, totalling 55 mm. Snow falls on about 2 days. All in all, January is not an ideal month for a holiday in Sønderborg.
Sønderborg in January12February5° · Sea 2° · 2 h
In February, Sønderborg is cold: daytime highs average 5 °C, and nights cool down to about 0 °C. The sea averages 2.3 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 10 rainy days and 48 mm in total. Snow falls on about 2 days. All in all, February is not an ideal month for a holiday in Sønderborg.
Sønderborg in February16March7° · Sea 3° · 4 h
In March, Sønderborg is cold: daytime highs average 7 °C, and nights cool down to about 1 °C. The sea averages 3.2 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 43 mm in total. All in all, March is not an ideal month for a holiday in Sønderborg.
Sønderborg in March24April11° · Sea 6° · 7 h
In April, Sønderborg is cool: daytime highs average 11 °C, and nights cool down to about 4 °C. The sea averages 5.6 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 42 mm in total. All in all, April is not an ideal month for a holiday in Sønderborg.
Sønderborg in April27May16° · Sea 11° · 8 h
In May, Sønderborg is cool: daytime highs average 16 °C, and nights cool down to about 8 °C. The sea averages 11.1 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain is frequent, with about 11 rainy days and 54 mm in total. All in all, May is not an ideal month for a holiday in Sønderborg.
Sønderborg in May25June19° · Sea 15° · 8 h
In June, Sønderborg is mild: daytime highs average 19 °C, and nights cool down to about 12 °C. The sea averages 15.3 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain is frequent, with about 11 rainy days and 64 mm in total. All in all, June is not an ideal month for a holiday in Sønderborg.
Sønderborg in June36July21° · Sea 18° · 8 h
In July, Sønderborg is mild: daytime highs average 21 °C, and nights cool down to about 14 °C. The sea averages 17.8 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain is frequent, with about 13 rainy days and 71 mm in total. All in all, July is not an ideal month for a holiday in Sønderborg.
Sønderborg in July37August21° · Sea 19° · 7 h
In August, Sønderborg is mild: daytime highs average 21 °C, and nights cool down to about 15 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain is frequent, with about 12 rainy days and 67 mm in total. All in all, August is not an ideal month for a holiday in Sønderborg.
Sønderborg in August19September17° · Sea 16° · 5 h
In September, Sønderborg is mild: daytime highs average 17 °C, and nights cool down to about 12 °C. The sea averages 16.4 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 54 mm in total. All in all, September is not an ideal month for a holiday in Sønderborg.
Sønderborg in September9October13° · Sea 13° · 3 h
In October, Sønderborg is cool: daytime highs average 13 °C, and nights cool down to about 9 °C. The sea averages 12.8 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 13 rainy days and 65 mm in total. All in all, October is not an ideal month for a holiday in Sønderborg.
Sønderborg in October9November8° · Sea 9° · 2 h
In November, Sønderborg is cold: daytime highs average 8 °C, and nights cool down to about 5 °C. The sea averages 9.1 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 11 rainy days and 51 mm in total. All in all, November is not an ideal month for a holiday in Sønderborg.
Sønderborg in November9December5° · Sea 5° · 1 h
In December, Sønderborg is cold: daytime highs average 5 °C, and nights cool down to about 2 °C. The sea averages 4.9 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Rain is frequent, with about 12 rainy days and 56 mm in total. All in all, December is not an ideal month for a holiday in Sønderborg.
Sønderborg in DecemberSønderborg compared
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Sønderborg vs. Flensburg
In October the holiday weather in Sønderborg and Flensburg is about equally good (score 9 vs. 8). During the day it is about as warm in Flensburg as in Sønderborg. The sea is about equally warm.
| in October | Sønderborg | Flensburg |
|---|---|---|
| Holiday score | 9 | 8 |
| Daytime high | 13° | 13° |
| Sea | 13° | 13° |
| Sunshine | 3 h | 3 h |
| Rainy days | 13 | 13 |
| Best time | Jul – Aug | Jul – Aug |
Through the year
Denmark in October: the best places
In October, Sønderborg ranks 6 of 19 destinations in this country.
- Odense13°12°39
- 2Aarhus12°12°35
- 3Copenhagen12°12°34
- 4Tønder13°33
- 5Roskilde12°12°11
- 6SønderborgThis page13°13°9
- 7Kolding13°12°9
- 8Fredericia13°12°9
Planning a trip to Sønderborg
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Sønderborg in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Sønderborg has its best school-holiday weather during the summer holidays (score 37) and its weakest during October half-term (score 9).
- 22
Easter holidays
Mar – Apr
Poor
- 10 °C by day
- Sea 5 °C
- 5.8 h of sun a day
- 10 rainy days a month
- 27
May half-term
May – Jun
Poor
- 16 °C by day
- Sea 12 °C
- 8.0 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 37
Summer holidays
Jul – Aug
PoorBest holidays
- 21 °C by day
- Sea 18 °C
- 7.3 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 9
October half-term
Oct
Poor
- 13 °C by day
- Sea 13 °C
- 3.4 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 9
Christmas holidays
Dec – Jan
Poor
- 4 °C by day
- Sea 4 °C
- 1.3 h of sun a day
- 12 rainy days a month
Keep in mind: Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 1 h 25 min
- Distance
- 780 km
- Time zone
- UTC+2
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Sønderborg
When is the best time to visit Sønderborg?
The best time to visit Sønderborg is from July to August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Sønderborg?
The sea temperature in Sønderborg ranges from 2.3 °C in February to 18.6 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Sønderborg in October?
Only if you don't mind cold water: in October the sea averages just 12.8 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Sønderborg?
July is the warmest month, with average highs of 21 °C and nights around 14 °C. January is the coolest month at 4 °C.
When does it rain most in Sønderborg?
Rain is most frequent from July to August and in October; the wettest month is July with 71 mm. The driest month is April with 42 mm.
How many hours of sunshine does Sønderborg get?
Sønderborg gets around 1,720 hours of sunshine a year. The sunniest month is May with 8.0 hours a day; in December there are 1.1 hours a day.
What time zone is Sønderborg in?
Sønderborg uses the time zone Europe/Copenhagen: UTC+1 in January and UTC+2 in July.
How long is the flight from London to Sønderborg?
A nonstop flight from London to Sønderborg takes about 1 h 25 min, for a straight-line distance of about 780 km.
Which school holidays are best for Sønderborg?
Sønderborg has its best school-holiday weather during the summer holidays (score 37) and its weakest during October half-term (score 9). Holiday ratings (0–100): Easter holidays 22, May half-term 27, Summer holidays 37, October half-term 9, Christmas holidays 9.
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Destinations whose weather through the year is closest to Sønderborg's – good alternatives.