Karlshamn weather in September

In September, Karlshamn sees average daytime highs of 16°C and overnight lows near 10°C, with 59 mm of rain across 10.2 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 14°C by the end. The sky is clear or mostly clear about 19% 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 Karlshamn's 6th-clearest and 7th-windiest month. For the whole year in context, see Karlshamn's year-round climate.

Daytime high
16°
4th warmest
Overnight low
10°
9th coldest
Rainfall
59 mm
10.2 wet days
Daylight
12 h 30 min
5:41 AM – 6:09 PM
Cloud cover
66%
6th clearest
Wind
16 km/h
7th windiest
Solar energy
2.79 kWh/m²
Travel score
4.8
out of 10

Karlshamn is urban area in Karlshamn Municipality, Sweden.

Air quality
Good
PM10 18 µg/m³ · 2019
Founded
1664

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 18°C in the first days to 14°C by the end.

A typical September day in Karlshamn reaches about 16°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 13°C and 19°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)
11812
21812
31812
41812
51711
61711
71711
81711
91711
101711
111711
121611
131611
141610
151610
161610
171610
181610
191510
201510
211510
221510
23159
24159
25159
26149
27149
28149
29149
30149

How September really feels in Karlshamn

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.

Karlshamn weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°5411.35.47.30.0
Feb / -2°459.75.79.10.0
Mar / -0°399.13.411.40.2
Apr / 378.50.813.82.0
May14° / 509.90164.1
Jun18° / 11°6711.4017.25.4
Jul20° / 13°7611.8016.86.0
Aug20° / 13°6912.1014.95.9
Sep16° / 10°5910.2012.54.8
Oct11° / 6511.30.310.12.5
Nov / 6112.51.47.90.6
Dec / 6012.24.16.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34159
44258
54258
64357
74357
84357
94357
104357
114258
124159
134060
144060
153961
163862
173763
183763
193763
203763
213664
223565
233565
243565
253565
263367
273367
283367
293268
303268

Chance of precipitation in September

Any precipitation

Karlshamn gets around 59 mm of rain over 10.2 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 35% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
336
436
536
635
735
835
935
1035
1135
1235
1335
1435
1535
1635
1734
1834
1934
2034
2133
2233
2333
2433
2534
2634
2734
2834
2935
3035

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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
165296
267285
368275
470264
572253
673243
775232
876222
977212
1079201
1180191
1281181
1382171
1483161
1584151
1685141
1787130
1888120
1988120
2089110
2190100
2290100
239190
249190
259190
269280
279280
289280
299370
309370

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
315light breeze
415light breeze
515light breeze
615light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2817light breeze
2917light breeze
3017light breeze

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 5:11 AM to 6:10 AM, and sunset from 6:50 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:116:50
213.65:136:47
313.55:156:45
413.45:176:42
513.35:196:39
613.35:216:36
713.25:236:34
813.15:256:31
913.05:276:28
1012.95:296:25
1112.95:316:23
1212.85:336:20
1312.75:356:17
1412.65:376:14
1512.55:396:11
1612.55:416:09
1712.45:436:06
1812.35:456:03
1912.25:476:00
2012.15:495:58
2112.15:515:55
2212.05:535:52
2311.95:555:49
2411.85:575:47
2511.75:595:44
2611.76:015:41
2711.66:045:38
2811.56:065:35
2911.46:085:33
3011.36:105:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.79 kWh/m².

For context, solar energy here swings from a low near 0.32 kWh/m² to a high of 5.71 kWh/m² in June across the year — September's 2.79 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.4Moderate
43.4Moderate
53.3Moderate
63.3Moderate
73.2Moderate
83.2Moderate
93.1Moderate
103.1Moderate
113.0Moderate
123.0Moderate
132.9Moderate
142.8Moderate
152.8Moderate
162.7Moderate
172.7Moderate
182.6Moderate
192.6Moderate
202.5Moderate
212.5Moderate
222.4Moderate
232.4Moderate
242.3Moderate
252.3Moderate
262.2Moderate
272.2Moderate
282.1Moderate
292.1Moderate
302.0Moderate
Planning a trip in September

Is September a good time to visit Karlshamn?

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

4.8
Sightseeing
4th-best month of the year
0.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Karlshamn for sightseeing.

What to pack for Karlshamn in September

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

In September, Karlshamn sees daytime highs around 16°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 Karlshamn 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
Mar3Bracing
Apr5Bracing
May9Bracing
Jun13Bracing
Jul17Cool
Aug18Cool
Sep15Cool
Oct12Bracing
Nov8Bracing
Dec6Bracing

UV index in Karlshamn 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 Karlshamn peaks around June 20 at about 5 (high) — 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 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 20UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5Moderate
Jun5High
Jul5High
Aug4Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low
Location & terrain

Where is Karlshamn?

Karlshamn sits at 56.2°N, 14.9°E, 14 m above sea level, in Sweden. The nearest listed city is Karlskrona, 45 km away.

LjungbyEslövYstadKalmar

Topography around Karlshamn

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

Within 3 km, the terrain around Karlshamn has only modest variations in elevation — a maximum elevation change of 83 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 153 m; within 80 km, significant variations in elevation — a maximum elevation change of 281 m.

The land around Karlshamn is covered by trees (53%) within 3 km, trees (45%) and water (40%) within 16 km, and trees (53%) and water (35%) within 80 km.

3 km
83 m
16 km
153 m
80 km
281 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Karlskrona 45 km · Kristianstad 47 km · Hässleholm 68 km · Växjö 79 km · Ljungby 93 km · Eslöv 104 km · Ystad 105 km · Kalmar 107 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 Karlshamn (56.1706°, 14.8619°, elevation 14 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).