Oskarshamn weather in September

In September, Oskarshamn sees average daytime highs of 17°C and overnight lows near 9°C, with 44 mm of rain across 8.4 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 7th-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 Oskarshamn's 6th-clearest and 7th-windiest month. For the whole year in context, see Oskarshamn's year-round climate.

Daytime high
17°
4th warmest
Overnight low
9th coldest
Rainfall
44 mm
8.4 wet days
Daylight
12 h 30 min
5:34 AM – 6:03 PM
Cloud cover
65%
6th clearest
Wind
14 km/h
7th windiest
Solar energy
2.86 kWh/m²
Travel score
5.5
out of 10

Oskarshamn is urban area in Oskarshamn Municipality, Sweden.

Founded
1856

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 Oskarshamn reaches about 17°C in the afternoon and slips back to 9°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 21°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)
11911
21911
31911
41911
51911
61911
71810
81810
91810
101810
111810
121810
131810
141710
151710
16179
17179
18179
19179
20169
21169
22169
23168
24168
25168
26158
27158
28158
29158
30158

How September really feels in Oskarshamn

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.

Oskarshamn weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°338.65.47.10.0
Feb / -3°3185.790.0
Mar / -1°287.83.111.40.4
Apr11° / 297.10.913.92.7
May16° / 469.9016.25.0
Jun20° / 10°5710.6017.56.0
Jul22° / 13°7010.80176.6
Aug22° / 13°5810.60156.4
Sep17° / 448.4012.55.5
Oct11° / 489.90.1102.8
Nov / 5010.41.97.70.6
Dec / -1°429.83.86.50.0

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 17% of September, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33961
43961
53961
63961
73961
83961
93961
103961
113862
123763
133763
143763
153664
163664
173664
183664
193664
203664
213664
223664
233664
243664
253664
263664
273664
283565
293565
303466

Chance of precipitation in September

Any precipitation

Oskarshamn gets around 44 mm of rain over 8.4 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 29% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
133
232
332
431
530
630
729
829
929
1028
1128
1228
1328
1428
1528
1628
1728
1828
1928
2028
2128
2228
2328
2428
2528
2628
2728
2828
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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
173225
275214
376204
476204
578193
679183
781172
881172
982162
1084151
1184151
1285141
1385141
1486131
1587121
1687121
1789110
1890100
1990100
209190
219280
229280
239370
249370
259460
269460
279460
289550
299550
309550

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 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
113light breeze
213light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light 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 5:02 AM to 6:04 AM, and sunset from 6:46 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:026:46
213.65:046:43
313.65:066:40
413.55:096:37
513.45:116:34
613.35:136:32
713.25:156:29
813.15:176:26
913.15:196:23
1013.05:216:20
1112.95:236:17
1212.85:266:14
1312.75:286:12
1412.65:306:09
1512.65:326:06
1612.55:346:03
1712.45:366:00
1812.35:385:57
1912.25:415:54
2012.15:435:51
2112.15:455:49
2212.05:475:46
2311.95:495:43
2411.85:515:40
2511.75:535:37
2611.65:565:34
2711.65:585:31
2811.56:005:29
2911.46:025:26
3011.36:045:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.86 kWh/m².

For context, solar energy here swings from a low near 0.3 kWh/m² to a high of 5.89 kWh/m² in June across the year — September's 2.86 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
113.1Moderate
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 Oskarshamn?

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

5.5
Sightseeing
4th-best month of the year
1.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Oskarshamn for sightseeing.

What to pack for Oskarshamn in September

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

In September, Oskarshamn sees daytime highs around 17°C and nights near 9°C. Worth packing: rain gear. About 8 days see rain.

rain gear

Sea temperature near Oskarshamn 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 at the nearest coast (about 16 km away) is warmest in August at about 18°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
Apr4Bracing
May8Bracing
Jun13Bracing
Jul17Cool
Aug18Cool
Sep15Bracing
Oct11Bracing
Nov7Bracing
Dec5Bracing

UV index in Oskarshamn 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 Oskarshamn peaks around June 17 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 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 17UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May5Moderate
Jun6High
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low
Location & terrain

Where is Oskarshamn?

Oskarshamn sits at 57.3°N, 16.4°E, 22 m above sea level, in Sweden. The nearest listed city is Västervik, 56 km away.

VäxjöNässjöVisbyKarlskronaLinköpingHuskvarna

Topography around Oskarshamn

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

Within 3 km, the terrain around Oskarshamn has only modest variations in elevation — a maximum elevation change of 62 m around an average of 20 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 103 m; within 80 km, significant variations in elevation — a maximum elevation change of 318 m.

The land around Oskarshamn is covered by trees (59%) within 3 km, trees (57%) and water (36%) within 16 km, and trees (54%) and water (35%) within 80 km.

3 km
62 m
16 km
103 m
80 km
318 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Västervik 56 km · Kalmar 67 km · Växjö 108 km · Nässjö 113 km · Visby 118 km · Karlskrona 133 km · Linköping 137 km · Huskvarna 141 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 Oskarshamn (57.2645°, 16.4484°, elevation 22 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).