Bremerhaven weather in September

In September, Bremerhaven sees average daytime highs of 18°C and overnight lows near 12°C, with 66 mm of rain across 10.9 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 16°C by the end. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Bremerhaven's 5th-clearest and 8th-windiest month. For the whole year in context, see Bremerhaven's year-round climate.

Daytime high
18°
4th warmest
Overnight low
12°
9th coldest
Rainfall
66 mm
10.9 wet days
Daylight
12 h 24 min
6:07 AM – 6:33 PM
Cloud cover
67%
5th clearest
Wind
14 km/h
8th windiest
Solar energy
2.92 kWh/m²
Travel score
5.3
out of 10

Bremerhaven is German city in the Free Hanseatic City of Bremen.

Air quality
Moderate
PM2.5 11.1 µg/m³ · 2019
Density
1,168/km²
people per km²
Founded
1827

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 19°C in the first days to 16°C by the end.

A typical September day in Bremerhaven reaches about 18°C in the afternoon and slips back to 12°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 22°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11913
21913
31913
41913
51913
61913
71912
81912
91812
101812
111812
121812
131812
141812
151812
161812
171711
181711
191711
201711
211711
221711
231711
241611
251610
261610
271610
281610
291610
301610

How September really feels in Bremerhaven

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.

Bremerhaven weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6713.72.47.80.0
Feb / 5210.62.49.40.1
Mar / 5411.51.511.51.2
Apr12° / 52110.213.73.2
May16° / 6311.5015.64.8
Jun19° / 12°7913016.75.5
Jul21° / 14°9214.3016.35.8
Aug21° / 14°8413.9014.65.9
Sep18° / 12°6610.9012.55.3
Oct13° / 6512.6010.33.3
Nov / 5712.10.38.31.2
Dec / 6613.12.37.30.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33763
43862
53862
63763
73763
83763
93862
103763
113763
123664
133664
143664
153763
163763
173664
183664
193565
203565
213565
223565
233367
243268
253268
263367
273268
283268
293169
303169

Chance of precipitation in September

Any precipitation

Bremerhaven gets around 66 mm of rain over 10.9 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 44% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
144
243
342
442
541
641
740
839
939
1038
1138
1237
1337
1436
1535
1635
1734
1834
1934
2034
2134
2234
2335
2435
2536
2637
2738
2839
2940
3040

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 72% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1533791
2543781
3563680
4573670
5583570
6593560
7603460
8613360
9633250
10643150
11653050
12672940
13692740
14702640
15732430
16742330
17752230
18782020
19791920
20801820
21811810
22821710
23821710
24831610
25831610
26851500
27851500
28851500
29861400
30861400

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 30 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 126 minutes over September. Sunrise moves from 5:40 AM to 6:33 AM, and sunset from 7:10 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:407:10
213.45:427:08
313.45:447:05
413.35:467:03
513.25:487:00
613.15:496:58
713.15:516:55
813.05:536:53
912.95:556:50
1012.95:576:48
1112.85:586:45
1212.76:006:43
1312.66:026:40
1412.66:046:38
1512.56:066:35
1612.46:076:33
1712.36:096:30
1812.36:116:27
1912.26:136:25
2012.16:156:22
2112.16:176:20
2212.06:186:17
2311.96:206:15
2411.86:226:12
2511.86:246:10
2611.76:266:07
2711.66:276:05
2811.56:296:02
2911.56:316:00
3011.46:335:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.92 kWh/m².

For context, solar energy here swings from a low near 0.48 kWh/m² to a high of 5.34 kWh/m² in June across the year — September's 2.92 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.5Moderate
43.4Moderate
53.4Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.0Moderate
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
302.3Moderate
Planning a trip in September

Is September a good time to visit Bremerhaven?

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

5.3
Sightseeing
4th-best month of the year
1.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Bremerhaven for sightseeing.

What to pack for Bremerhaven in September

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

In September, Bremerhaven sees daytime highs around 18°C and nights near 12°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Bremerhaven in September

The nearest coast averages about 17°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 15 km away) is warmest in August at about 19°C and coldest in February near 4°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
Feb4Bracing
Mar5Bracing
Apr8Bracing
May12Bracing
Jun15Cool
Jul18Cool
Aug19Cool
Sep17Cool
Oct13Bracing
Nov9Bracing
Dec6Bracing

UV index in Bremerhaven in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bremerhaven peaks around July 17 at about 6 (high) — a little sun protection helps at midday. It bottoms out near December 21 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 17UV 6Dec 21UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May5High
Jun5High
Jul6High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Bremerhaven?

Bremerhaven sits at 53.6°N, 8.6°E, 2 m above sea level, in Germany. The nearest listed city is Langen, 6.0 km away.

Topography around Bremerhaven

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

Within 3 km, the terrain around Bremerhaven has only modest variations in elevation — a maximum elevation change of 24 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 53 m; within 80 km, only modest variations in elevation — a maximum elevation change of 194 m.

The land around Bremerhaven is covered by artificial surfaces (35%) and water (33%) within 3 km, grassland (45%) within 16 km, and grassland (32%), water (26%) and cropland (23%) within 80 km.

3 km
24 m
16 km
53 m
80 km
194 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Langen 6.0 km · Nordenham 8.0 km · Loxstedt 10 km · Brake (Unterweser) 25 km · Wilhelmshaven 31 km · Varel 34 km · Cuxhaven 36 km · Schwanewede 37 km

Germany travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 80% of US
price level, 2025
GDP per capita
$60,496
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.9
per 100k, 2023
Road deaths
3.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 615
Religion
none 44%Roman Catholic 25%Protestant 23%other 5%

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 Bremerhaven (53.5536°, 8.5755°, elevation 2 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).