Nyköping weather in September

In September, Nyköping sees average daytime highs of 15°C and overnight lows near 10°C, with 58 mm of rain across 9.3 wet days and about 12.6 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 13°C by the end. The sky is clear or mostly clear about 21% 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 Nyköping's 6th-clearest and 7th-windiest month. For the whole year in context, see Nyköping's year-round climate.

Daytime high
15°
4th warmest
Overnight low
10°
9th coldest
Rainfall
58 mm
9.3 wet days
Daylight
12 h 30 min
5:31 AM – 6:02 PM
Cloud cover
64%
6th clearest
Wind
16 km/h
7th windiest
Solar energy
2.73 kWh/m²
Travel score
4.7
out of 10

Nyköping is urban area in Nyköping Municipality, Sweden.

Founded
1187

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 17°C in the first days to 13°C by the end.

A typical September day in Nyköping reaches about 15°C in the afternoon and slips back to 10°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 18°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11812
21812
31712
41712
51712
61711
71711
81711
91711
101611
111611
121611
131611
141610
151610
161510
171510
181510
191510
201510
21159
22149
23149
24149
25149
26149
27139
28138
29138
30138

How September really feels in Nyköping

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.

Nyköping 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°429.266.70.0
Feb / -3°348.56.68.80.0
Mar / -1°327.64.311.40.0
Apr / 347.31.3141.4
May13° / 449.40.216.53.7
Jun17° / 11°6010.6017.95.4
Jul20° / 14°7011017.36.2
Aug20° / 14°6811.6015.26.0
Sep15° / 10°589.3012.64.7
Oct10° / 5810.50.29.92.1
Nov / 5711.32.67.40.2
Dec / -1°5211.45.26.10.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% 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
44357
54357
64357
74357
84357
94357
104357
114357
124258
134258
144159
154159
164060
174060
183961
193961
203862
213862
223862
233862
243862
253862
263763
273862
283862
293862
303862

Chance of precipitation in September

Any precipitation

Nyköping gets around 58 mm of rain over 9.3 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 32% and peaks near 38% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
237
336
436
535
634
734
834
933
1033
1133
1233
1332
1432
1532
1631
1731
1831
1931
2030
2130
2230
2329
2429
2529
2629
2729
2829
2930
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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
170255
272244
373234
475223
576213
678202
779192
881181
982171
1083161
1185150
1286140
1387130
1488120
1589110
169190
179280
189280
199370
209460
219460
229550
239550
249640
259640
269640
279730
289730
299730
309730

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 16 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
2816light breeze
2916light breeze
3016light 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 4:57 AM to 6:03 AM, and sunset from 6:47 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:576:47
213.74:596:44
313.75:016:41
413.65:046:38
513.55:066:35
613.45:086:32
713.35:106:29
813.25:136:26
913.15:156:23
1013.05:176:20
1113.05:206:17
1212.95:226:14
1312.85:246:11
1412.75:266:08
1512.65:296:05
1612.55:316:02
1712.45:335:59
1812.35:365:56
1912.25:385:52
2012.25:405:49
2112.15:425:46
2212.05:455:43
2311.95:475:40
2411.85:495:37
2511.75:525:34
2611.65:545:31
2711.55:565:28
2811.45:595:25
2911.46:015:22
3011.36:035:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.73 kWh/m².

For context, solar energy here swings from a low near 0.23 kWh/m² to a high of 5.85 kWh/m² in June across the year — September's 2.73 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.4Moderate
33.4Moderate
43.3Moderate
53.3Moderate
63.2Moderate
73.2Moderate
83.1Moderate
93.0Moderate
103.0Moderate
112.9Moderate
122.9Moderate
132.8Moderate
142.8Moderate
152.7Moderate
162.7Moderate
172.6Moderate
182.6Moderate
192.5Moderate
202.5Moderate
212.4Moderate
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 Nyköping?

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

4.7
Sightseeing
4th-best month of the year
0.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Nyköping for sightseeing.

What to pack for Nyköping in September

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

In September, Nyköping sees daytime highs around 15°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 Nyköping 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 16 km away) is warmest in August at about 17°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
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec5Bracing

UV index in Nyköping 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 Nyköping peaks around June 16 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 19 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 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul4Moderate
Aug4Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Nyköping?

Nyköping sits at 58.8°N, 17.0°E, 20 m above sea level, in Sweden. The nearest listed city is Norrköping, 51 km away.

Topography around Nyköping

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

Within 3 km, the terrain around Nyköping has only modest variations in elevation — a maximum elevation change of 62 m around an average of 18 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 92 m; within 80 km, only modest variations in elevation — a maximum elevation change of 191 m.

The land around Nyköping is covered by trees (36%), artificial surfaces (22%) and grassland (21%) within 3 km, trees (52%) within 16 km, and trees (46%) and water (37%) within 80 km.

3 km
62 m
16 km
92 m
80 km
191 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Norrköping 51 km · Katrineholm 53 km · Södertälje 61 km · Tumba 68 km · Tullinge 71 km · Eskilstuna 74 km · Ekerö 75 km · Huddinge 78 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 Nyköping (58.753°, 17.0079°, elevation 20 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).