Espoonlahti weather in September

In September, Espoonlahti sees average daytime highs of 15°C and overnight lows near 8°C, with 55 mm of rain across 10.1 wet days and about 12.6 hours of daylight. It is the 4th-warmest and 7th-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 19% 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 Espoonlahti's 7th-clearest and 6th-windiest month. For the whole year in context, see Espoonlahti's year-round climate.

Daytime high
15°
4th warmest
Overnight low
9th coldest
Rainfall
55 mm
10.1 wet days
Daylight
12 h 30 min
6:00 AM – 6:32 PM
Cloud cover
68%
7th clearest
Wind
14 km/h
6th windiest
Solar energy
2.54 kWh/m²
Travel score
4.3
out of 10

Espoonlahti is city district in Espoo, 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 Espoonlahti reaches about 15°C in the afternoon and slips back to 8°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 18°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)
11811
21711
31710
41710
51710
61710
71610
81610
9169
10169
11169
12169
13159
14159
15158
16158
17158
18148
19148
20148
21148
22147
23137
24137
25137
26137
27137
28127
29127
30126

How September really feels in Espoonlahti

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.

Espoonlahti 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° / -6°5011.110.26.40.0
Feb-2° / -7°418.98.88.60.0
Mar / -5°378.26.911.30.0
Apr / 378.82.414.21.2
May14° / 438.70.216.84.1
Jun18° / 10°6611.4018.45.5
Jul21° / 13°6911.2017.76.3
Aug20° / 12°7012.2015.45.9
Sep15° / 5510.1012.64.3
Oct / 5910.90.79.71.5
Nov / -0°5911.64.77.10.0
Dec / -4°5712.48.75.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 66%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13268
23268
33268
43268
53268
63466
73466
83565
93664
103664
113664
123664
133664
143763
153763
163763
173763
183664
193664
203664
213565
223565
233565
243466
253466
263466
273367
283367
293268
303268

Chance of precipitation in September

Any precipitation

Espoonlahti gets around 55 mm of rain over 10.1 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 34% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
336
436
536
636
736
836
936
1037
1136
1236
1336
1436
1535
1634
1734
1833
1933
2032
2132
2232
2331
2431
2531
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 89% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
174242
275232
376222
477212
579201
680191
781181
882171
983161
1085150
1186140
1287130
1388120
1489110
1590100
169280
179370
189460
199460
209550
219640
229640
239730
249730
259730
269820
279820
289820
299820
309910

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
313light breeze
413light breeze
513light 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
2314light breeze
2414light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

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 5:23 AM to 6:34 AM, and sunset from 7:19 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.95:237:19
213.85:257:16
313.85:287:13
413.75:307:10
513.65:337:07
613.55:357:04
713.45:387:00
813.35:406:57
913.25:426:54
1013.15:456:51
1113.05:476:48
1212.95:506:45
1312.85:526:41
1412.75:556:38
1512.65:576:35
1612.56:006:32
1712.46:026:29
1812.46:046:26
1912.36:076:22
2012.26:096:19
2112.16:126:16
2212.06:146:13
2311.96:176:10
2411.86:196:06
2511.76:226:03
2611.66:246:00
2711.56:265:57
2811.46:295:54
2911.36:315:51
3011.26:345:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.54 kWh/m².

For context, solar energy here swings from a low near 0.16 kWh/m² to a high of 5.79 kWh/m² in June across the year — September's 2.54 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.3Moderate
23.2Moderate
33.2Moderate
43.1Moderate
53.0Moderate
63.0Moderate
73.0Moderate
82.9Moderate
92.9Moderate
102.8Moderate
112.8Moderate
122.7Moderate
132.7Moderate
142.6Moderate
152.6Moderate
162.5Moderate
172.5Moderate
182.4Moderate
192.4Moderate
202.3Moderate
212.3Moderate
222.2Moderate
232.2Moderate
242.1Moderate
252.1Moderate
262.0Moderate
272.0Dim
281.9Dim
291.9Dim
301.8Dim
Planning a trip in September

Is September a good time to visit Espoonlahti?

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

4.3
Sightseeing
4th-best month of the year
0.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Espoonlahti for sightseeing.

What to pack for Espoonlahti in September

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

In September, Espoonlahti sees daytime highs around 15°C and nights near 8°C. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Espoonlahti 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 Espoonlahti 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 Espoonlahti 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 Espoonlahti?

Espoonlahti sits at 60.2°N, 24.7°E, 26 m above sea level, in Finland. The nearest listed city is Olari, 5.0 km away.

Topography around Espoonlahti

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

Within 3 km, the terrain around Espoonlahti has only modest variations in elevation — a maximum elevation change of 55 m around an average of 16 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 111 m; within 80 km, only modest variations in elevation — a maximum elevation change of 192 m.

The land around Espoonlahti is covered by trees (51%) and artificial surfaces (22%) within 3 km, trees (46%) and water (35%) within 16 km, and water (47%) and trees (41%) within 80 km.

3 km
55 m
16 km
111 m
80 km
192 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Olari 5.0 km · Matinkylä 5.0 km · Espoo 6.0 km · Leppävaara 11 km · Lauttasaari 12 km · Kirkkonummi 12 km · Munkkiniemi 14 km · Pitäjänmäki 14 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 Espoonlahti (60.1505°, 24.6531°, elevation 26 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).