Kalmar weather in September

In September, Kalmar sees average daytime highs of 17°C and overnight lows near 10°C, with 45 mm of rain across 8.9 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 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 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 Kalmar's 6th-clearest and 7th-windiest month. For the whole year in context, see Kalmar's year-round climate.

Daytime high
17°
4th warmest
Overnight low
10°
9th coldest
Rainfall
45 mm
8.9 wet days
Daylight
12 h 30 min
5:35 AM – 6:03 PM
Cloud cover
64%
6th clearest
Wind
15 km/h
7th windiest
Solar energy
2.87 kWh/m²
Travel score
5.3
out of 10

Kalmar is city in Kalmar Municipality, Sweden.

Founded
1100

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 Kalmar reaches about 17°C in the afternoon and slips back to 10°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 13°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
31911
41811
51811
61811
71811
81811
91811
101811
111711
121710
131710
141710
151710
161710
171610
181610
191610
20169
21169
22169
23159
24159
25159
26159
27159
28158
29148
30148

How September really feels in Kalmar

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.

Kalmar 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 / -2°369.25.37.20.0
Feb / -2°348.46.39.10.0
Mar / -1°297.6311.40.3
Apr10° / 287.2113.92.3
May15° / 459.7016.14.5
Jun19° / 11°5310.4017.45.9
Jul21° / 13°6610.3016.96.5
Aug21° / 13°5910.6014.96.3
Sep17° / 10°458.9012.55.3
Oct11° / 509.60.1102.8
Nov / 5211.11.87.80.6
Dec / -0°4410.146.60.0

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 20% of September, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24258
34258
44258
54258
64258
74357
84357
94357
104357
114258
124060
134060
144060
154060
163961
173862
183862
193862
203862
213862
223862
233862
243862
253862
263664
273664
283664
293565
303466

Chance of precipitation in September

Any precipitation

Kalmar gets around 45 mm of rain over 8.9 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 30% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
335
434
533
633
732
831
931
1030
1130
1230
1329
1429
1529
1629
1729
1828
1928
2028
2128
2228
2328
2428
2528
2629
2729
2829
2929
3029

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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
169256
270246
371245
472235
574224
675223
776213
877212
978202
1080191
1180191
1281181
1382171
1483161
1585150
1686140
1787130
1888120
1989110
2090100
219190
229190
239280
249370
259370
269460
279460
289460
299550
309550

Wind in September

Winds average 15 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 15 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
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light 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 5:04 AM to 6:04 AM, and sunset from 6:45 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:046:45
213.65:066:42
313.55:086:39
413.45:106:37
513.45:126:34
613.35:146:31
713.25:166:28
813.15:186:25
913.05:206:23
1013.05:226:20
1112.95:246:17
1212.85:266:14
1312.75:296:11
1412.65:316:09
1512.65:336:06
1612.55:356:03
1712.45:376:00
1812.35:395:57
1912.25:415:55
2012.15:435:52
2112.15:455:49
2212.05:475:46
2311.95:495:43
2411.85:515:40
2511.75:545:38
2611.75:565:35
2711.65:585:32
2811.56:005:29
2911.46:025:26
3011.36:045:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.87 kWh/m².

For context, solar energy here swings from a low near 0.31 kWh/m² to a high of 5.88 kWh/m² in June across the year — September's 2.87 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.5Moderate
33.5Moderate
43.5Moderate
53.4Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.1Moderate
113.1Moderate
123.0Moderate
133.0Moderate
142.9Moderate
152.9Moderate
162.8Moderate
172.8Moderate
182.7Moderate
192.7Moderate
202.6Moderate
212.6Moderate
222.5Moderate
232.5Moderate
242.4Moderate
252.4Moderate
262.3Moderate
272.3Moderate
282.2Moderate
292.2Moderate
302.1Moderate
Planning a trip in September

Is September a good time to visit Kalmar?

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
1.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Kalmar for sightseeing.

What to pack for Kalmar in September

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

In September, Kalmar sees daytime highs around 17°C and nights near 10°C. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Kalmar 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
Jan3Bracing
Feb3Bracing
Mar3Bracing
Apr4Bracing
May8Bracing
Jun13Bracing
Jul16Cool
Aug18Cool
Sep15Bracing
Oct11Bracing
Nov8Bracing
Dec5Bracing

UV index in Kalmar 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 Kalmar peaks around June 18 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 18UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May5Moderate
Jun6High
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low
Location & terrain

Where is Kalmar?

Kalmar sits at 56.7°N, 16.4°E, 7 m above sea level, in Sweden. The nearest listed city is Oskarshamn, 67 km away.

KarlshamnVästervikLjungbyNässjöVärnamo

Topography around Kalmar

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

Within 3 km, the terrain around Kalmar has only modest variations in elevation — a maximum elevation change of 22 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 67 m; within 80 km, significant variations in elevation — a maximum elevation change of 306 m.

The land around Kalmar is covered by water (59%) and artificial surfaces (20%) within 3 km, water (34%), trees (26%) and grassland (22%) within 16 km, and trees (48%) and water (40%) within 80 km.

3 km
22 m
16 km
67 m
80 km
306 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Oskarshamn 67 km · Karlskrona 73 km · Växjö 98 km · Karlshamn 107 km · Västervik 123 km · Ljungby 149 km · Nässjö 149 km · Värnamo 152 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 Kalmar (56.6616°, 16.3616°, elevation 7 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).