Frederikshavn weather in September

In September, Frederikshavn sees average daytime highs of 15°C and overnight lows near 13°C, with 72 mm of rain across 11.3 wet days and about 12.5 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 14°C by the end. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Frederikshavn's 6th-clearest and 7th-windiest month. For the whole year in context, see Frederikshavn's year-round climate.

Daytime high
15°
3rd warmest
Overnight low
13°
10th coldest
Rainfall
72 mm
11.3 wet days
Daylight
12 h 30 min
5:58 AM – 6:27 PM
Cloud cover
61%
6th clearest
Wind
25 km/h
7th windiest
Solar energy
2.98 kWh/m²
Travel score
4.5
out of 10

Frederikshavn is town in northeast Jutland, Denmark.

Density
1,667/km²
people per km²
Founded
1818

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 17°C in the first days to 14°C by the end.

A typical September day in Frederikshavn reaches about 15°C in the afternoon and slips back to 13°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 17°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°151015202530
Avg high (°C)Avg low (°C)
11715
21715
31715
41715
51614
61614
71614
81614
91614
101614
111614
121614
131614
141514
151513
161513
171513
181513
191513
201513
211513
221513
231413
241412
251412
261412
271412
281412
291412
301412

How September really feels in Frederikshavn

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Frederikshavn weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6712.44.570.0
Feb / 469.3490.0
Mar / 4492.711.40.0
Apr / 428.30.413.91.2
May12° / 509.5016.23.2
Jun15° / 13°6610.1017.64.8
Jul18° / 15°568.40176.1
Aug18° / 16°7711.40155.8
Sep15° / 13°7211.3012.54.5
Oct11° / 10°9414.30.1102.6
Nov / 7714.20.97.71.1
Dec / 6913.62.96.40.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24654
34654
44753
54753
64753
74852
84753
94753
104753
114753
124753
134753
144654
154555
164555
174555
184456
194456
204357
214357
224357
234258
244258
254258
264258
274060
284060
294159
304159

Chance of precipitation in September

Any precipitation

Frederikshavn gets around 72 mm of rain over 11.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
338
438
538
638
738
839
939
1039
1139
1239
1339
1439
1539
1639
1738
1838
1938
2037
2137
2237
2337
2437
2538
2638
2739
2839
2940
3041

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 78% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
161336
262326
364315
464315
566304
667294
768284
870273
971263
1073243
1174233
1275223
1377212
1478202
1579192
1680182
1782171
1883161
1984151
2085141
2185141
2287130
2387130
2488120
2588120
2689110
2790100
2890100
299190
309280

Wind in September

Winds average 25 km/h in September.

Across September, daily wind ranges from about 23 km/h on the calmest days to 26 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
123breezy
223breezy
323breezy
424breezy
524breezy
624breezy
724breezy
824breezy
925breezy
1025breezy
1125breezy
1225breezy
1325breezy
1425breezy
1525breezy
1625breezy
1725breezy
1825breezy
1925breezy
2025breezy
2125breezy
2225breezy
2325breezy
2425breezy
2525breezy
2626breezy
2726breezy
2826breezy
2926breezy
3026breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 42 min at the start of September to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 144 minutes over September. Sunrise moves from 5:25 AM to 6:28 AM, and sunset from 7:10 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:257:10
213.75:287:07
313.65:307:04
413.55:327:01
513.45:346:58
613.35:366:56
713.25:386:53
813.25:406:50
913.15:436:47
1013.05:456:44
1112.95:476:41
1212.85:496:38
1312.75:516:35
1412.75:536:32
1512.65:556:30
1612.55:586:27
1712.46:006:24
1812.36:026:21
1912.26:046:18
2012.16:066:15
2112.16:086:12
2212.06:116:09
2311.96:136:06
2411.86:156:04
2511.76:176:01
2611.66:195:58
2711.66:215:55
2811.56:245:52
2911.46:265:49
3011.36:285:46

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.98 kWh/m².

For context, solar energy here swings from a low near 0.31 kWh/m² to a high of 6.35 kWh/m² in June across the year — September's 2.98 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.4Moderate
93.3Moderate
103.3Moderate
113.2Moderate
123.2Moderate
133.1Moderate
143.0Moderate
153.0Moderate
162.9Moderate
172.9Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.7Moderate
222.6Moderate
232.6Moderate
242.5Moderate
252.5Moderate
262.4Moderate
272.4Moderate
282.3Moderate
292.3Moderate
302.2Moderate
Planning a trip in September

Is September a good time to visit Frederikshavn?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.5
Sightseeing
4th-best month of the year
0.4
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Frederikshavn for sightseeing.

What to pack for Frederikshavn in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Frederikshavn sees daytime highs around 15°C and nights near 13°C. Worth packing: a warm layer, rain gear and a windbreaker. About 11 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Frederikshavn in September

The nearest coast averages about 15°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 18°C and coldest in February near 3°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar4Bracing
Apr7Bracing
May11Bracing
Jun14Bracing
Jul17Cool
Aug18Cool
Sep15Cool
Oct12Bracing
Nov9Bracing
Dec6Bracing

UV index in Frederikshavn in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Frederikshavn peaks around August 10 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowAug 10UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May5Moderate
Jun5Moderate
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low
Location & terrain

Where is Frederikshavn?

Frederikshavn sits at 57.4°N, 10.5°E, 8 m above sea level, in Denmark. The nearest listed city is Skagen, 31 km away.

SkagenHjørringNørresundbyAalborgBjörlandaVästra FrölundaMajornaGothenburg

Topography around Frederikshavn

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Frederikshavn.

Within 3 km, the terrain around Frederikshavn has only modest variations in elevation — a maximum elevation change of 92 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 123 m; within 80 km, only modest variations in elevation — a maximum elevation change of 141 m.

The land around Frederikshavn is covered by water (45%) and artificial surfaces (25%) within 3 km, water (57%) within 16 km, and water (72%) within 80 km.

3 km
92 m
16 km
123 m
80 km
141 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Skagen 31 km · Hjørring 33 km · Nørresundby 56 km · Aalborg 57 km · Björlanda 85 km · Västra Frölunda 86 km · Majorna 87 km · Gothenburg 90 km

Denmark travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E / F / K
230 V · 50 Hz
Prices
≈ 92% of US
price level, 2025
GDP per capita
$76,970
2025
Happiness
7.5 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
3.7
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 611
Religion
Evangelical Lutheran 71%other/none/unspecified 24%Muslim 4%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Frederikshavn (57.4407°, 10.5366°, elevation 8 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).