Nacka weather in September

In September, Nacka sees average daytime highs of 15°C and overnight lows near 10°C, with 51 mm of rain across 8.7 wet days and about 12.6 hours of daylight. It is the 4th-warmest and 6th-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 24% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 54 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Nacka's 6th-clearest and 7th-windiest month. For the whole year in context, see Nacka's year-round climate.

Daytime high
15°
4th warmest
Overnight low
10°
9th coldest
Rainfall
51 mm
8.7 wet days
Daylight
12 h 30 min
5:26 AM – 5:57 PM
Cloud cover
63%
6th clearest
Wind
17 km/h
7th windiest
Solar energy
2.78 kWh/m²
Travel score
4.5
out of 10

Nacka is part of Stockholm, Sweden.

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 Nacka 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 5°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11712
21712
31712
41712
51712
61612
71612
81611
91611
101611
111611
121611
131511
141511
151510
161510
171510
181510
191410
201410
211410
22149
23149
24149
25139
26139
27139
28139
29138
30138

How September really feels in Nacka

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.

Nacka 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°398.86.26.60.0
Feb / -3°328.26.68.70.0
Mar / -1°307.94.611.30.0
Apr / 327.51.714.11.0
May12° / 398.30.116.63.2
Jun16° / 11°6110.3018.15.0
Jul19° / 14°6110017.56.2
Aug19° / 14°6511.5015.35.9
Sep15° / 10°518.7012.64.5
Oct10° / 5410.50.29.82.0
Nov / 5411.337.30.2
Dec / -1°5111.45.55.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% 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 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14060
24258
34258
44258
54357
64357
74555
84555
94456
104555
114456
124555
134555
144555
154456
164456
174357
184357
194357
204258
214258
224258
234159
244159
254060
264060
274159
284060
294060
303961

Chance of precipitation in September

Any precipitation

Nacka gets around 51 mm of rain over 8.7 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 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
334
434
533
633
732
832
931
1031
1131
1230
1330
1430
1529
1629
1729
1828
1928
2028
2128
2227
2327
2427
2527
2628
2728
2828
2928
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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
167276
269265
371254
472244
574233
676222
777212
879201
980191
1082171
1183161
1285150
1387130
1488120
1589110
1690100
179190
189280
199370
209460
219550
229550
239640
249640
259640
269730
279730
289730
299820
309820

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 16 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
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light 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 54 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 156 minutes over September. Sunrise moves from 4:51 AM to 5:59 AM, and sunset from 6:43 PM to 5:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:516:43
213.84:536:40
313.74:566:37
413.64:586:34
513.55:006:31
613.45:036:28
713.35:056:25
813.25:076:22
913.25:106:19
1013.15:126:16
1113.05:146:13
1212.95:176:10
1312.85:196:07
1412.75:216:03
1512.65:246:00
1612.55:265:57
1712.45:285:54
1812.35:315:51
1912.25:335:48
2012.25:355:45
2112.15:385:42
2212.05:405:39
2311.95:425:36
2411.85:455:33
2511.75:475:30
2611.65:505:26
2711.55:525:23
2811.45:545:20
2911.35:575:17
3011.35:595:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.78 kWh/m².

For context, solar energy here swings from a low near 0.21 kWh/m² to a high of 5.98 kWh/m² in June across the year — September's 2.78 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
103.0Moderate
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 Nacka?

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

4.5
Sightseeing
4th-best month of the year
0.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Nacka for sightseeing.

What to pack for Nacka in September

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

In September, Nacka 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 Nacka 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 24 km away) is warmest in August at about 17°C and coldest in March 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
Apr3Bracing
May7Bracing
Jun12Bracing
Jul16Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec5Bracing

UV index in Nacka 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 Nacka peaks around June 17 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 17UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug4Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Nacka?

Nacka sits at 59.3°N, 18.2°E, 49 m above sea level, in Sweden. The nearest listed city is Södermalm, 5.0 km away.

Topography around Nacka

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

Within 3 km, the terrain around Nacka has only modest variations in elevation — a maximum elevation change of 74 m around an average of 28 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, only modest variations in elevation — a maximum elevation change of 126 m.

The land around Nacka is covered by trees (57%) and water (26%) within 3 km, trees (57%) and water (22%) within 16 km, and water (43%) and trees (41%) within 80 km.

3 km
74 m
16 km
100 m
80 km
126 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Södermalm 5.0 km · Östermalm 5.0 km · Stockholm 6.0 km · Lidingö 6.0 km · Årsta 7.0 km · Boo 7.0 km · Kungsholmen 7.0 km · Vasastaden 9.0 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 Nacka (59.3105°, 18.1637°, elevation 49 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).