Norrköping weather in September

In September, Norrköping sees average daytime highs of 16°C and overnight lows near 9°C, with 52 mm of rain across 9 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 4th-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 17% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Norrköping's 6th-clearest and 7th-windiest month. For the whole year in context, see Norrköping's year-round climate.

Daytime high
16°
4th warmest
Overnight low
9th coldest
Rainfall
52 mm
9 wet days
Daylight
12 h 30 min
5:34 AM – 6:05 PM
Cloud cover
66%
6th clearest
Wind
12 km/h
7th windiest
Solar energy
2.64 kWh/m²
Travel score
4.9
out of 10

Norrköping is urban area in Norrköping Municipality, Sweden.

Air quality
Good
PM10 20.7 µg/m³ · 2019

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 Norrköping reaches about 16°C in the afternoon and slips back to 9°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 20°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11811
21811
31810
41810
51810
61810
71710
81710
91710
101710
11179
12179
13169
14169
15169
16169
17169
18169
19158
20158
21158
22158
23158
24158
25148
26147
27147
28147
29147
30137

How September really feels in Norrköping

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.

Norrköping weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°358.35.46.80.0
Feb / -4°317.56.18.80.0
Mar / -2°297.74.211.40.3
Apr10° / 357.71.3142.4
May15° / 499.60.316.54.7
Jun19° / 10°6711.7017.95.8
Jul21° / 13°7612.2017.36.2
Aug21° / 12°6912.1015.26.0
Sep16° / 529012.54.9
Oct10° / 5110.20.29.92.3
Nov / 4810.237.50.2
Dec / -2°4510.25.36.10.0

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 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23763
33763
43961
53961
63961
73961
84060
94060
103862
113862
123862
133862
143763
153763
163664
173565
183466
193466
203466
213466
223466
233466
243466
253466
263565
273565
283565
293565
303565

Chance of precipitation in September

Any precipitation

Norrköping gets around 52 mm of rain over 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 31% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
236
335
434
533
633
732
832
932
1031
1131
1231
1331
1431
1531
1631
1731
1831
1931
2030
2130
2230
2330
2429
2529
2629
2729
2829
2929
3030

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
177194
279183
380173
480173
582162
683152
784151
885141
986131
1087130
1188120
1289110
1390100
1490100
159190
169280
179280
189370
199460
209460
219550
229550
239550
249640
259640
269640
279640
289730
299730
309730

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 48 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 150 minutes over September. Sunrise moves from 5:00 AM to 6:06 AM, and sunset from 6:50 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:006:50
213.75:036:47
313.65:056:44
413.65:076:41
513.55:096:38
613.45:126:35
713.35:146:32
813.25:166:29
913.15:196:26
1013.05:216:23
1112.95:236:20
1212.95:256:17
1312.85:286:14
1412.75:306:11
1512.65:326:08
1612.55:346:05
1712.45:376:02
1812.35:395:59
1912.25:415:56
2012.25:435:53
2112.15:465:50
2212.05:485:47
2311.95:505:44
2411.85:535:41
2511.75:555:38
2611.65:575:35
2711.55:595:32
2811.46:025:29
2911.46:045:26
3011.36:065:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.64 kWh/m².

For context, solar energy here swings from a low near 0.24 kWh/m² to a high of 5.68 kWh/m² in June across the year — September's 2.64 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.4Moderate
23.3Moderate
33.2Moderate
43.2Moderate
53.1Moderate
63.1Moderate
73.0Moderate
83.0Moderate
92.9Moderate
102.9Moderate
112.8Moderate
122.8Moderate
132.7Moderate
142.7Moderate
152.6Moderate
162.6Moderate
172.5Moderate
182.5Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.3Moderate
232.3Moderate
242.2Moderate
252.2Moderate
262.1Moderate
272.1Moderate
282.0Moderate
292.0Moderate
301.9Dim
Planning a trip in September

Is September a good time to visit Norrköping?

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

4.9
Sightseeing
4th-best month of the year
0.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Norrköping for sightseeing.

What to pack for Norrköping in September

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

In September, Norrköping sees daytime highs around 16°C and nights near 9°C. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Norrköping in September

The nearest coast averages about 14°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 47 km away) is warmest in August at about 18°C and coldest in February near 2°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
Feb2Bracing
Mar2Bracing
Apr4Bracing
May7Bracing
Jun13Bracing
Jul17Cool
Aug18Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec5Bracing

UV index in Norrköping 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 Norrköping peaks around June 16 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 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateModerateLowJun 16UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul4Moderate
Aug4Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low
Location & terrain

Where is Norrköping?

Norrköping sits at 58.6°N, 16.2°E, 12 m above sea level, in Sweden. The nearest listed city is Linköping, 38 km away.

EskilstunaÖrebroVästervik

Topography around Norrköping

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

Within 3 km, the terrain around Norrköping has only modest variations in elevation — a maximum elevation change of 65 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 180 m; within 80 km, significant variations in elevation — a maximum elevation change of 272 m.

The land around Norrköping is covered by artificial surfaces (45%) and trees (28%) within 3 km, trees (45%) within 16 km, and trees (55%) and water (24%) within 80 km.

3 km
65 m
16 km
180 m
80 km
272 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Linköping 38 km · Katrineholm 45 km · Nyköping 51 km · Motala 67 km · Kumla 84 km · Eskilstuna 88 km · Örebro 94 km · Västervik 97 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 Norrköping (58.5942°, 16.1826°, elevation 12 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).