Korsholm weather in September

In September, Korsholm sees average daytime highs of 14°C and overnight lows near 7°C, with 53 mm of rain across 9.7 wet days and about 12.7 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 12°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 14 h 12 min at the start of September to 11 h 06 min by month's end. Set against the rest of the year, September is Korsholm's 7th-clearest and 7th-windiest month. For the whole year in context, see Korsholm's year-round climate.

Daytime high
14°
4th warmest
Overnight low
9th coldest
Rainfall
53 mm
9.7 wet days
Daylight
12 h 36 min
6:09 AM – 6:46 PM
Cloud cover
66%
7th clearest
Wind
12 km/h
7th windiest
Solar energy
2.35 kWh/m²
Travel score
4.1
out of 10

Korsholm is village in Korsholm, Finland.

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 12°C by the end.

A typical September day in Korsholm reaches about 14°C in the afternoon and slips back to 7°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 18°C. Set against its neighbours, September runs about 5°C cooler than August and about 7°C warmer than October.

10°20°151015202530
Avg high (°C)Avg low (°C)
1179
2179
3179
4178
5168
6168
7168
8168
9168
10157
11157
12157
13157
14157
15147
16146
17146
18146
19136
20136
21136
22136
23135
24125
25125
26125
27125
28125
29115
30115

How September really feels in Korsholm

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.

Korsholm weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -8°349.28.75.40.0
Feb-3° / -9°277.26.98.10.0
Mar / -6°307.66.311.20.0
Apr / -1°338.43.514.51.2
May14° / 449.20.217.64.0
Jun18° / 6411.2019.65.6
Jul21° / 12°7612.4018.76.1
Aug19° / 11°7312.2015.95.8
Sep14° / 539.7012.74.1
Oct / 5410.429.41.0
Nov / -2°46104.76.30.0
Dec-1° / -5°4310.67.54.40.0

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 18% of September, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23763
33763
43862
53862
63961
73961
83961
93961
103961
113961
123961
133862
143862
153862
163961
173961
183961
193862
203862
213862
223664
233664
243664
253664
263565
273565
283664
293565
303565

Chance of precipitation in September

Any precipitation

Korsholm gets around 53 mm of rain over 9.7 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 33% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
235
335
435
534
634
734
834
934
1034
1134
1234
1334
1433
1533
1633
1733
1832
1932
2032
2132
2232
2332
2432
2532
2632
2732
2833
2933
3034

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 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
186131
287121
387121
489110
590100
69190
79280
89280
99370
109460
119460
129550
139550
149640
159640
169730
179730
189820
199820
209820
219910
229910
239910
249910
259910
269910
2710000
2810000
2910000
3010000

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
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light 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 14 h 12 min at the start of September to 11 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 186 minutes over September. Sunrise moves from 5:27 AM to 6:49 AM, and sunset from 7:39 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.25:277:39
214.15:307:35
314.05:337:32
413.95:357:28
513.85:387:25
613.75:417:21
713.65:447:18
813.55:477:14
913.45:507:11
1013.25:527:07
1113.15:557:04
1213.05:587:00
1312.96:016:57
1412.86:046:53
1512.76:066:49
1612.66:096:46
1712.56:126:42
1812.46:156:39
1912.36:186:35
2012.26:216:32
2112.16:236:28
2212.06:266:25
2311.96:296:21
2411.86:326:17
2511.76:356:14
2611.56:376:10
2711.46:406:07
2811.36:436:03
2911.26:466:00
3011.16:495:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.35 kWh/m².

For context, solar energy here swings from a low near 0.07 kWh/m² to a high of 5.85 kWh/m² in June across the year — September's 2.35 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.1Moderate
23.0Moderate
33.0Moderate
42.9Moderate
52.9Moderate
62.8Moderate
72.8Moderate
82.7Moderate
92.7Moderate
102.6Moderate
112.6Moderate
122.5Moderate
132.5Moderate
142.4Moderate
152.4Moderate
162.3Moderate
172.3Moderate
182.2Moderate
192.2Moderate
202.1Moderate
212.1Moderate
222.0Moderate
231.9Dim
241.9Dim
251.8Dim
261.8Dim
271.7Dim
281.7Dim
291.6Dim
301.6Dim
Planning a trip in September

Is September a good time to visit Korsholm?

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

4.1
Sightseeing
4th-best month of the year
0.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Korsholm for sightseeing.

What to pack for Korsholm in September

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

In September, Korsholm sees daytime highs around 14°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Korsholm in September

The nearest coast averages about 13°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 15 km away) is warmest in August at about 16°C and coldest in February near 0°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan1Bracing
Feb0Bracing
Mar0Bracing
Apr1Bracing
May5Bracing
Jun10Bracing
Jul15Bracing
Aug16Cool
Sep13Bracing
Oct9Bracing
Nov5Bracing
Dec3Bracing

UV index in Korsholm in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Korsholm peaks around June 18 at about 4 (moderate) — 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 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowJun 18UV 4Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar1Low
Apr2Moderate
May4Moderate
Jun4Moderate
Jul4Moderate
Aug4Moderate
Sep2Low
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Korsholm?

Korsholm sits at 63.1°N, 21.7°E, 15 m above sea level, in Finland. The nearest listed city is Vaasa, 4.0 km away.

KurikkaSeinäjokiKauhavaJakobstadUmeåKokkola

Topography around Korsholm

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

Within 3 km, the terrain around Korsholm has only modest variations in elevation — a maximum elevation change of 32 m around an average of 11 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, only modest variations in elevation — a maximum elevation change of 212 m.

The land around Korsholm is covered by trees (58%) and artificial surfaces (21%) within 3 km, trees (53%) and water (22%) within 16 km, and water (46%) and trees (40%) within 80 km.

3 km
32 m
16 km
73 m
80 km
212 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Vaasa 4.0 km · Kurikka 67 km · Seinäjoki 68 km · Kauhava 70 km · Jakobstad 80 km · Umeå 106 km · Kokkola 108 km · Örnsköldsvik 150 km

Finland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 85% of US
price level, 2025
GDP per capita
$56,149
2025
Happiness
7.8 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1
per 100k, 2023
Road deaths
3.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 603
Religion
Lutheran 67%none 31%other 2%Greek Orthodox 1%

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 Korsholm (63.1142°, 21.6822°, elevation 15 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).