Gustavsberg weather in September

In September, Gustavsberg sees average daytime highs of 14°C and overnight lows near 12°C, with 54 mm of rain across 9.1 wet days and about 12.6 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 16°C in the first days to 12°C by the end. The sky is clear or mostly clear about 25% 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 Gustavsberg's 6th-clearest and 7th-windiest month. For the whole year in context, see Gustavsberg's year-round climate.

Daytime high
14°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
54 mm
9.1 wet days
Daylight
12 h 30 min
5:25 AM – 5:56 PM
Cloud cover
61%
6th clearest
Wind
21 km/h
7th windiest
Solar energy
2.82 kWh/m²
Travel score
4.3
out of 10

Gustavsberg is urban area in Värmdö Municipality, Sweden.

Density
8,656/km²
people per km²

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 16°C in the first days to 12°C by the end.

A typical September day in Gustavsberg reaches about 14°C in the afternoon and slips back to 12°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 17°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°151015202530
Avg high (°C)Avg low (°C)
11614
21614
31614
41614
51613
61613
71613
81613
91513
101513
111513
121512
131512
141512
151412
161412
171412
181412
191411
201411
211411
221311
231311
241311
251311
261310
271310
281210
291210
301210

How September really feels in Gustavsberg

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.

Gustavsberg weather by month

How September compares with the rest of the year at a glance. September is the 3rd-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°449.96.66.60.0
Feb / -2°348.76.88.70.0
Mar / -1°3184.511.30.0
Apr / 327.21.714.10.3
May10° / 367.70.116.62.2
Jun14° / 12°579.1018.14.3
Jul18° / 15°568.9017.56.0
Aug18° / 16°6110.7015.35.8
Sep14° / 12°549.1012.64.3
Oct / 6311.70.29.81.9
Nov / 6412.42.57.30.3
Dec / 5812.75.35.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 55%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24456
34456
44654
54654
64753
74753
84852
94951
104753
114852
124852
134852
144852
154753
164753
174753
184654
194555
204555
214456
224456
234357
244357
254456
264357
274357
284258
294258
304258

Chance of precipitation in September

Any precipitation

Gustavsberg gets around 54 mm of rain over 9.1 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 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
334
434
533
633
732
832
932
1032
1131
1231
1331
1431
1531
1631
1731
1830
1930
2030
2130
2230
2330
2430
2530
2630
2730
2830
2931
3031

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 (%)Muggy (%)
1613261
2633151
3643141
4653041
5672931
6692821
7712720
8722620
9742420
10772210
11782110
12801910
13821710
14831610
15861400
16871300
17881200
18901000
1991900
2092800
2193700
2294600
2394600
2495500
2595500
2696400
2796400
2897300
2997300
3097300

Wind in September

Winds average 21 km/h in September.

Across September, daily wind ranges from about 20 km/h on the calmest days to 22 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
120light breeze
220light breeze
320breezy
420breezy
520breezy
620breezy
720breezy
820breezy
921breezy
1021breezy
1121breezy
1221breezy
1321breezy
1421breezy
1521breezy
1621breezy
1721breezy
1821breezy
1921breezy
2021breezy
2121breezy
2221breezy
2321breezy
2421breezy
2521breezy
2621breezy
2721breezy
2821breezy
2921breezy
3022breezy

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 4:50 AM to 5:58 AM, and sunset from 6:42 PM to 5:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:506:42
213.84:526:39
313.74:556:36
413.64:576:33
513.54:596:30
613.45:026:27
713.35:046:24
813.25:066:21
913.25:096:18
1013.15:116:15
1113.05:136:12
1212.95:166:09
1312.85:186:06
1412.75:206:03
1512.65:235:59
1612.55:255:56
1712.45:275:53
1812.35:305:50
1912.25:325:47
2012.25:355:44
2112.15:375:41
2212.05:395:38
2311.95:425:35
2411.85:445:32
2511.75:465:29
2611.65:495:26
2711.55:515:22
2811.45:535:19
2911.35:565:16
3011.35:585:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.82 kWh/m².

For context, solar energy here swings from a low near 0.21 kWh/m² to a high of 6.09 kWh/m² in June across the year — September's 2.82 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.5Moderate
33.5Moderate
43.4Moderate
53.4Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.1Moderate
113.0Moderate
123.0Moderate
132.9Moderate
142.9Moderate
152.8Moderate
162.8Moderate
172.7Moderate
182.7Moderate
192.6Moderate
202.6Moderate
212.5Moderate
222.5Moderate
232.4Moderate
242.4Moderate
252.3Moderate
262.3Moderate
272.2Moderate
282.2Moderate
292.1Moderate
302.1Moderate
Planning a trip in September

Is September a good time to visit Gustavsberg?

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

4.3
Sightseeing
3rd-best month of the year
0.2
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Gustavsberg for sightseeing.

What to pack for Gustavsberg in September

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

In September, Gustavsberg sees daytime highs around 14°C and nights near 12°C. Worth packing: a warm layer, rain gear and a windbreaker. About 9 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Gustavsberg 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 22 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 Gustavsberg 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 Gustavsberg 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 Gustavsberg?

Gustavsberg sits at 59.3°N, 18.4°E, 7 m above sea level, in Sweden. The nearest listed city is Boo, 6.0 km away.

Topography around Gustavsberg

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

Within 3 km, the terrain around Gustavsberg has only modest variations in elevation — a maximum elevation change of 63 m around an average of 23 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 84 m; within 80 km, only modest variations in elevation — a maximum elevation change of 109 m.

The land around Gustavsberg is covered by trees (69%) within 3 km, trees (53%) and water (37%) within 16 km, and water (49%) and trees (38%) within 80 km.

3 km
63 m
16 km
84 m
80 km
109 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Boo 6.0 km · Nacka 13 km · Lidingö 15 km · Östermalm 17 km · Åkersberga 18 km · Södermalm 18 km · Stockholm 18 km · Årsta 19 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 Gustavsberg (59.3268°, 18.3897°, 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).