Kirkkonummi weather in September

In September, Kirkkonummi sees average daytime highs of 14°C and overnight lows near 12°C, with 68 mm of rain across 10.9 wet days and about 12.6 hours of daylight. It is the 3rd-warmest and 4th-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 23% 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 12 min by month's end. Set against the rest of the year, September is Kirkkonummi's 6th-clearest and 6th-windiest month. For the whole year in context, see Kirkkonummi's year-round climate.

Daytime high
14°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
68 mm
10.9 wet days
Daylight
12 h 30 min
6:00 AM – 6:33 PM
Cloud cover
64%
6th clearest
Wind
24 km/h
6th windiest
Solar energy
2.61 kWh/m²
Travel score
4.0
out of 10

Kirkkonummi is administrative centre of Kirkkonummi.

Air quality
Excellent
PM10 11.4 µg/m³ · 2019

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 Kirkkonummi 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 11°C and 16°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
51614
61614
71613
81513
91513
101513
111513
121513
131513
141412
151412
161412
171412
181412
191412
201412
211311
221311
231311
241311
251311
261311
271210
281210
291210
301210

How September really feels in Kirkkonummi

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.

Kirkkonummi weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -4°52129.96.40.0
Feb-2° / -6°409.38.28.60.0
Mar-0° / -4°378.8611.30.0
Apr / 367.92.114.20.0
May / 377.20.216.81.5
Jun13° / 11°568.9018.43.6
Jul18° / 16°589017.76.0
Aug18° / 16°7211.4015.45.6
Sep14° / 12°6810.9012.64.0
Oct / 8413.70.49.71.7
Nov / 79143.87.10.2
Dec / -1°6613.77.65.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% 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 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
34060
44060
54060
64159
74159
84258
94258
104258
114357
124258
134357
144357
154258
164258
174159
184159
194060
204060
214060
223961
233961
243961
253862
263763
273862
283763
293763
303763

Chance of precipitation in September

Any precipitation

Kirkkonummi gets around 68 mm of rain over 10.9 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 37% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
238
338
438
538
638
738
838
938
1038
1138
1237
1337
1437
1536
1636
1736
1835
1935
2035
2135
2235
2335
2435
2535
2635
2736
2836
2937
3038

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 (%)
159347
261336
362326
464315
566304
668284
770273
872253
974242
1076222
1178202
1280182
1383161
1484151
1586131
1687121
1790100
189190
199280
209370
219460
229550
239640
249640
259730
269730
279730
289820
299820
309820

Wind in September

Winds average 24 km/h in September.

Across September, daily wind ranges from about 22 km/h on the calmest days to 26 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
122breezy
222breezy
323breezy
423breezy
523breezy
623breezy
723breezy
823breezy
924breezy
1024breezy
1124breezy
1224breezy
1324breezy
1424breezy
1524breezy
1624breezy
1724breezy
1825breezy
1925breezy
2025breezy
2125breezy
2225breezy
2325breezy
2425breezy
2525breezy
2625breezy
2725breezy
2825breezy
2926breezy
3026breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 54 min at the start of September to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 162 minutes over September. Sunrise moves from 5:24 AM to 6:35 AM, and sunset from 7:20 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.95:247:20
213.85:267:17
313.85:297:14
413.75:317:11
513.65:347:08
613.55:367:04
713.45:397:01
813.35:416:58
913.25:436:55
1013.15:466:52
1113.05:486:49
1212.95:516:45
1312.85:536:42
1412.75:566:39
1512.65:586:36
1612.56:006:33
1712.46:036:30
1812.46:056:26
1912.36:086:23
2012.26:106:20
2112.16:136:17
2212.06:156:14
2311.96:176:10
2411.86:206:07
2511.76:226:04
2611.66:256:01
2711.56:275:58
2811.46:305:55
2911.36:325:52
3011.26:355:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.61 kWh/m².

For context, solar energy here swings from a low near 0.16 kWh/m² to a high of 5.92 kWh/m² in June across the year — September's 2.61 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.4Moderate
23.3Moderate
33.2Moderate
43.2Moderate
53.1Moderate
63.1Moderate
73.0Moderate
83.0Moderate
92.9Moderate
102.9Moderate
112.8Moderate
122.8Moderate
132.7Moderate
142.7Moderate
152.6Moderate
162.6Moderate
172.5Moderate
182.5Moderate
192.4Moderate
202.4Moderate
212.3Moderate
222.3Moderate
232.2Moderate
242.2Moderate
252.1Moderate
262.1Moderate
272.0Moderate
282.0Dim
291.9Dim
301.9Dim
Planning a trip in September

Is September a good time to visit Kirkkonummi?

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

4.0
Sightseeing
3rd-best month of the year
0.2
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Kirkkonummi for sightseeing.

What to pack for Kirkkonummi in September

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

In September, Kirkkonummi sees daytime highs around 14°C and nights near 12°C. Worth packing: a warm layer, rain gear and a windbreaker. About 11 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Kirkkonummi 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 offshore is warmest in August at about 17°C and coldest in March near 1°C.

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

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May6Bracing
Jun11Bracing
Jul16Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Kirkkonummi 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 Kirkkonummi peaks around June 18 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 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 18UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Kirkkonummi?

Kirkkonummi sits at 60.1°N, 24.4°E, 17 m above sea level, in Finland. The nearest listed city is Espoonlahti, 12 km away.

Topography around Kirkkonummi

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

Within 3 km, the terrain around Kirkkonummi has only modest variations in elevation — a maximum elevation change of 61 m around an average of 25 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 193 m.

The land around Kirkkonummi is covered by trees (67%) within 3 km, trees (56%) and water (24%) within 16 km, and water (46%) and trees (42%) within 80 km.

3 km
61 m
16 km
100 m
80 km
193 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Espoonlahti 12 km · Espoo 15 km · Olari 17 km · Matinkylä 17 km · Leppävaara 23 km · Lauttasaari 24 km · Lohja 25 km · Munkkiniemi 26 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 Kirkkonummi (60.1238°, 24.4385°, elevation 17 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).