AI-generatedFlensburg at a glance
- Best time
- Jul – Aug
- Warmest month
- Jul · 21°
- Warmest sea
- Aug · 18.6°
- Sunshine a year
- 1,670 h
- Rain a year
- 755 mm
- Climate
- Maritime
- Time zone
- UTC+1 / UTC+2
- Elevation
- 33 m
Climate in Flensburg
Flensburg 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 1,670 hours of sunshine a year, Flensburg is moderately sunny; May is the sunniest month with 7.7 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 8°
- Midday, 13:00: about 12°
- Afternoon, 16:00: about 13°
- Evening, 20:00: about 11°
- Night, 23:00: about 10°
07:4918:27
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 07:27–08:39 · evening 17:37–18:49
- Blue hour
- Morning 07:13–07:27 · evening 18:49–19:03
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 Flensburg in October?
In October, Flensburg is cool: daytime highs average 13 °C, and nights cool down to about 8 °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 73 mm in total. All in all, October is not an ideal month for a holiday in Flensburg.
More details for October
- Daylight
- 10 h 37 min07:49 – 18:27
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 73 %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/Berlin
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %5 %
- Few rainy daysweight 20 %34 %
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 Flensburg
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 Flensburg 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. From November to December 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 Flensburg
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 3.3 of 10.6 hours of daylight in Flensburg, 31 % 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 Flensburg
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 Flensburg: 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, Flensburg has about 13 rainy days with 73 mm of rain in total.
Wind and clouds in Flensburg
How breezy and how cloudy Flensburg 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 Flensburg typically peaks at 22 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: Sep – Jul.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 73 % of the sky over Flensburg: mostly cloudy, with about 3.3 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 Flensburg
Snow is possible in Flensburg, 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 Flensburg.
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 Flensburg
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°
CoolOctober: nights around 8°. A duvet at night and a jumper for the evening.
The coolest nights are in January (0°), the warmest in August (14°). 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 | 7 | 4° | 0° | 3.1° | 1.4 h | 13 | 63 |
| FebruaryFeb | 10 | 5° | 0° | 2.3° | 2.3 h | 11 | 54 |
| MarchMar | 15 | 7° | 1° | 3.2° | 4.0 h | 10 | 47 |
| AprilApr | 23 | 12° | 4° | 5.6° | 6.4 h | 10 | 47 |
| MayMay | 25 | 16° | 8° | 11.1° | 7.7 h | 11 | 61 |
| JuneJun | 24 | 19° | 11° | 15.3° | 7.5 h | 12 | 71 |
| JulyJul | 34 | 21° | 14° | 17.8° | 7.4 h | 13 | 83 |
| AugustAug | 35 | 21° | 14° | 18.6° | 6.6 h | 13 | 76 |
| SeptemberSep | 17 | 18° | 12° | 16.4° | 5.0 h | 11 | 61 |
| OctoberOct | 8 | 13° | 8° | 12.8° | 3.3 h | 13 | 73 |
| NovemberNov | 8 | 8° | 4° | 9.1° | 1.8 h | 12 | 57 |
| DecemberDec | 8 | 5° | 1° | 4.9° | 1.2 h | 13 | 63 |
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
54.79° N, 9.44° E · 33 m · Europe/Berlin
Best time to visit Flensburg
The best time to visit Flensburg 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 from October to January; the wettest month is July with 83 mm.
Flensburg through the seasons
How the weather changes over the seasons, with averages for each.
Flensburg in spring
Mar – May
Poor
- 7–16 °C by day
- Sea 7 °C
- 6 h of sun a day
- 31 rainy days in all
Flensburg in summer
Jun – Aug
Poor
- 19–21 °C by day
- Sea 17 °C
- 7 h of sun a day
- 38 rainy days in all
Flensburg in autumn
Sep – Nov
Poor
- 8–18 °C by day
- Sea 13 °C
- 3 h of sun a day
- 37 rainy days in all
Flensburg in winter
Dec – Feb
Poor
- 4–5 °C by day
- Sea 3 °C
- 2 h of sun a day
- 36 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Flensburg for you.
Your best months: June – August
Based on the climate averages; tap a month to see its details.
Compare two months in Flensburg
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 Flensburg: score 35 against 8. In August, days are 8 °C warmer than in October. The sea is 6 °C warmer in August. The sun shines 3 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Weather score | 8 | 35better |
| Day high | 13° | 21° |
| Night low | 8° | 14° |
| Sea | 12.8° | 18.6° |
| Sunshine | 3.3 h | 6.6 hbetter |
| Rainy days | 13 | 13 |
| Rainfall | 73 mm | 76 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 – Jan
12 or more rainy days
Snow
Jan – Feb
Snow on 2 or more days
Flensburg month by month
The typical weather for every month at a glance.
7January4° · Sea 3° · 1 h
In January, Flensburg is cold: daytime highs average 4 °C, and nights often drop below freezing (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 13 days, totalling 63 mm. Snow falls on about 2 days. All in all, January is not an ideal month for a holiday in Flensburg.
Flensburg in January10February5° · Sea 2° · 2 h
In February, Flensburg 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 11 rainy days and 54 mm in total. Snow falls on about 2 days. All in all, February is not an ideal month for a holiday in Flensburg.
Flensburg in February15March7° · Sea 3° · 4 h
In March, Flensburg 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 47 mm in total. All in all, March is not an ideal month for a holiday in Flensburg.
Flensburg in March23April12° · Sea 6° · 6 h
In April, Flensburg is cool: daytime highs average 12 °C, and nights cool down to about 4 °C. The sea averages 5.6 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 47 mm in total. All in all, April is not an ideal month for a holiday in Flensburg.
Flensburg in April25May16° · Sea 11° · 8 h
In May, Flensburg 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 61 mm in total. All in all, May is not an ideal month for a holiday in Flensburg.
Flensburg in May24June19° · Sea 15° · 8 h
In June, Flensburg is mild: daytime highs average 19 °C, and nights cool down to about 11 °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 12 rainy days and 71 mm in total. All in all, June is not an ideal month for a holiday in Flensburg.
Flensburg in June34July21° · Sea 18° · 7 h
In July, Flensburg 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 7 hours a day. Rain is frequent, with about 13 rainy days and 83 mm in total. All in all, July is not an ideal month for a holiday in Flensburg.
Flensburg in July35August21° · Sea 19° · 7 h
In August, Flensburg is mild: daytime highs average 21 °C, and nights cool down to about 14 °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 13 rainy days and 76 mm in total. All in all, August is not an ideal month for a holiday in Flensburg.
Flensburg in August17September18° · Sea 16° · 5 h
In September, Flensburg is mild: daytime highs average 18 °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 11 rainy days and 61 mm in total. All in all, September is not an ideal month for a holiday in Flensburg.
Flensburg in September8October13° · Sea 13° · 3 h
In October, Flensburg is cool: daytime highs average 13 °C, and nights cool down to about 8 °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 73 mm in total. All in all, October is not an ideal month for a holiday in Flensburg.
Flensburg in October8November8° · Sea 9° · 2 h
In November, Flensburg is cold: daytime highs average 8 °C, and nights cool down to about 4 °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 12 rainy days and 57 mm in total. All in all, November is not an ideal month for a holiday in Flensburg.
Flensburg in November8December5° · Sea 5° · 1 h
In December, Flensburg is cold: daytime highs average 5 °C, and nights cool down to about 1 °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 13 rainy days and 63 mm in total. Snow falls on about 2 days. All in all, December is not an ideal month for a holiday in Flensburg.
Flensburg in DecemberFlensburg compared
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Flensburg vs. Sønderborg
In October the holiday weather in Flensburg and Sønderborg is about equally good (score 8 vs. 9). During the day it is about as warm in Sønderborg as in Flensburg. The sea is about equally warm.
| in October | Flensburg | Sønderborg |
|---|---|---|
| Holiday score | 8 | 9 |
| 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
Germany in October: the best places
In October, Flensburg ranks 21 among the 31 nearest destinations in this country.
- Havelberg14°50
- 2Hanover14°45
- 3Wolfsburg14°45
- 4Lüneburg14°44
- 5Hamburg14°42
- 6Schwerin13°42
- 7Bremen14°42
- 8Oldenburg14°42
- 21FlensburgThis page13°13°8
Planning a trip to Flensburg
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Flensburg 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.
Flensburg has its best school-holiday weather during the summer holidays (score 35) and its weakest during October half-term (score 8).
- 21
Easter holidays
Mar – Apr
Poor
- 10 °C by day
- Sea 5 °C
- 5.7 h of sun a day
- 10 rainy days a month
- 25
May half-term
May – Jun
Poor
- 16 °C by day
- Sea 12 °C
- 7.7 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 35
Summer holidays
Jul – Aug
PoorBest holidays
- 21 °C by day
- Sea 18 °C
- 6.9 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 8
October half-term
Oct
Poor
- 13 °C by day
- Sea 13 °C
- 3.3 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 8
Christmas holidays
Dec – Jan
Poor
- 4 °C by day
- Sea 4 °C
- 1.3 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain, Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 1 h 25 min
- Distance
- 760 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 Flensburg
When is the best time to visit Flensburg?
The best time to visit Flensburg 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 Flensburg?
The sea temperature in Flensburg 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 Flensburg 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 Flensburg?
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 Flensburg?
Rain is most frequent from July to August and from October to January; the wettest month is July with 83 mm. The driest month is March with 47 mm.
How many hours of sunshine does Flensburg get?
Flensburg gets around 1,670 hours of sunshine a year. The sunniest month is May with 7.7 hours a day; in December there are 1.2 hours a day.
What time zone is Flensburg in?
Flensburg uses the time zone Europe/Berlin: UTC+1 in January and UTC+2 in July.
How long is the flight from London to Flensburg?
A nonstop flight from London to Flensburg takes about 1 h 25 min, for a straight-line distance of about 760 km.
Which school holidays are best for Flensburg?
Flensburg has its best school-holiday weather during the summer holidays (score 35) and its weakest during October half-term (score 8). Holiday ratings (0–100): Easter holidays 21, May half-term 25, Summer holidays 35, October half-term 8, Christmas holidays 8.
Near Flensburg
Other destinations close by.
Places with a climate like Flensburg
Destinations whose weather through the year is closest to Flensburg's – good alternatives.