Trelleborg weather in September

In September, Trelleborg sees average daytime highs of 17°C and overnight lows near 10°C, with 54 mm of rain across 9.5 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 15°C by the end. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 36 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Trelleborg's 6th-clearest and 7th-windiest month. For the whole year in context, see Trelleborg's year-round climate.

Daytime high
17°
4th warmest
Overnight low
10°
9th coldest
Rainfall
54 mm
9.5 wet days
Daylight
12 h 24 min
5:48 AM – 6:15 PM
Cloud cover
66%
6th clearest
Wind
16 km/h
7th windiest
Solar energy
2.93 kWh/m²
Travel score
5.3
out of 10

Trelleborg is urban area in Trelleborg Municipality, Sweden.

Air quality
Good
PM10 18.5 µg/m³ · 2019
Founded
1257

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 15°C by the end.

A typical September day in Trelleborg reaches about 17°C in the afternoon and slips back to 10°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 20°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)
11912
21912
31912
41912
51812
61811
71811
81811
91811
101811
111811
121711
131711
141711
151711
161710
171710
181710
191610
201610
211610
221610
231610
241610
25159
26159
27159
28159
29159
30159

How September really feels in Trelleborg

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.

Trelleborg weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°5111.64.47.50.0
Feb / -1°429.84.49.20.0
Mar / 419.52.711.40.5
Apr11° / 378.80.413.82.6
May15° / 439.4015.94.8
Jun19° / 11°6011017.15.8
Jul21° / 13°6011.4016.66.3
Aug21° / 13°6811.9014.86.2
Sep17° / 10°549.5012.55.3
Oct12° / 5610.9010.13.0
Nov / 4911.30.88.10.9
Dec / 5411.32.86.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24258
34258
44159
54159
64159
74060
84159
94159
104060
114060
123961
133862
143862
153763
163763
173664
183565
193565
203565
213565
223466
233466
243466
253367
263367
273367
283268
293268
303268

Chance of precipitation in September

Any precipitation

Trelleborg gets around 54 mm of rain over 9.5 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 33% and peaks near 39% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
239
338
438
537
637
736
835
935
1034
1133
1233
1332
1432
1531
1631
1730
1830
1930
2029
2129
2229
2329
2429
2530
2630
2731
2831
2932
3032

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 80% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
163316
264315
366304
467294
569283
669283
771272
872262
974251
1075241
1176231
1277221
1378211
1480191
1582180
1683170
1784160
1885150
1986140
2087130
2188120
2288120
2389110
2489110
2589110
2690100
2790100
289190
299190
309190

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 36 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 132 minutes over September. Sunrise moves from 5:19 AM to 6:16 AM, and sunset from 6:55 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:196:55
213.55:216:53
313.55:236:50
413.45:256:47
513.35:276:45
613.25:296:42
713.15:316:39
813.15:336:37
913.05:356:34
1012.95:376:31
1112.85:386:29
1212.85:406:26
1312.75:426:23
1412.65:446:21
1512.55:466:18
1612.45:486:15
1712.45:506:12
1812.35:526:10
1912.25:546:07
2012.15:566:04
2112.15:586:02
2212.06:005:59
2311.96:025:56
2411.86:045:53
2511.76:065:51
2611.76:085:48
2711.66:105:45
2811.56:125:43
2911.46:145:40
3011.46:165:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.93 kWh/m².

For context, solar energy here swings from a low near 0.37 kWh/m² to a high of 5.83 kWh/m² in June across the year — September's 2.93 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.6Moderate
33.6Moderate
43.5Moderate
53.5Moderate
63.4Moderate
73.4Moderate
83.3Moderate
93.3Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.0Moderate
143.0Moderate
152.9Moderate
162.9Moderate
172.8Moderate
182.8Moderate
192.7Moderate
202.7Moderate
212.6Moderate
222.6Moderate
232.5Moderate
242.5Moderate
252.4Moderate
262.4Moderate
272.3Moderate
282.3Moderate
292.2Moderate
302.2Moderate
Planning a trip in September

Is September a good time to visit Trelleborg?

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
1.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Trelleborg for sightseeing.

What to pack for Trelleborg in September

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

In September, Trelleborg sees daytime highs around 17°C and nights near 10°C. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Trelleborg in September

The nearest coast averages about 16°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
Mar3Bracing
Apr5Bracing
May9Bracing
Jun14Bracing
Jul17Cool
Aug18Cool
Sep16Cool
Oct12Bracing
Nov9Bracing
Dec6Bracing

UV index in Trelleborg in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Trelleborg peaks around June 18 at about 6 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 18UV 6Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5Moderate
Jun6High
Jul5High
Aug5Moderate
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Trelleborg?

Trelleborg sits at 55.4°N, 13.2°E, 8 m above sea level, in Sweden. The nearest listed city is Malmo, 27 km away.

Topography around Trelleborg

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

Within 3 km, the terrain around Trelleborg has only modest variations in elevation — a maximum elevation change of 37 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 105 m; within 80 km, significant variations in elevation — a maximum elevation change of 276 m.

The land around Trelleborg is covered by water (37%), cropland (24%) and artificial surfaces (23%) within 3 km, water (48%) and cropland (39%) within 16 km, and water (53%) and cropland (21%) within 80 km.

3 km
37 m
16 km
105 m
80 km
276 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Malmo 27 km · Staffanstorp 30 km · Lund 37 km · Ystad 42 km · Indre By 50 km · Copenhagen 50 km · Frederiksberg 52 km · Valby 52 km

Sweden travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 87% of US
price level, 2025
GDP per capita
$63,133
2025
Happiness
7.3 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
3.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 609
Religion
Church of Sweden 54%none or unspecified 37%other 9%

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 Trelleborg (55.3751°, 13.1569°, 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).