Early September 1 September
66°F
Typical afternoon high
32% historical wet-day frequency
Finland · Beach
Southern Finland
in September.
Is September a good time?
Mild days.
Fewer overnight stays than August.
September averages 61°F afternoons and 59°F seas, with about 10 rain days. Later September is typically cooler.
- Afternoons
- 61°F
- Sea
- 59°F
- Visitor demand
- 47%of July peak
Historical Etelä-Suomi regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers Turku; conditions vary within the region.
Overall match
5.6/10 · scores & prioritiesWhat matters most?
Weather 50% · Crowds 30% · Cost 20%
#5 of 12 months here · Balanced mix
Weather4.0/10Fair
CrowdsModerate seasonvs its own year; overnight stays do not measure queuesFor its size, quieter than most of Europe this month
CostPriceyfor Europe
Overall combines weather, overnight demand and cost. It does not include sea temperature.
Plan your September
What to expect.
What should I pack?
Afternoons around 61°F (16°C): light layers; nights around 46°F (8°C): a warm coat. Bring rain gear: about 10 days with at least 1 mm of rain. About 13 hours of daylight.
Can I swim in September?
The sea averages 59°F. Our swimming guide: cold: short dips, or a wetsuit. Your comfort will vary. This is open water near the coast, not a beach-specific reading.
Monthly coastal averages from NOAA, 2011–2025. Sea temperature is separate from the weather and Overall scores.
A typical day: temperatures & daylightAfternoons, nights, sea temperature & daylight Show detailsHide details
About 13 hours of daylight.
The sun rises about 06:44 and sets about 19:46 (local time, mid-month). Mornings start around 46°F (8°C); afternoons reach about 61°F (16°C). Expect rain on about 10 days in a typical September.
Typical afternoon
61°F (16°C)
average daily high, 15 recent Septembers
Night low
46°F (8°C)
average daily minimum
Sea
59°F (15°C)
cold; open water near the coast, NOAA satellite record 2011–2025
Daylight
13h 02m
on the 15th, computed from latitude
Early, middle or late?
Early or late September?
Early September is typically warmer. The afternoon high averages 66°F on the 1st, versus 55°F on the 30th.
Mid September 15 September
62°F
Typical afternoon high
36% historical wet-day frequency
Late September 30 September
55°F
Typical afternoon high
30% historical wet-day frequency
Historical daily averages from 2011–2025, smoothed over two weeks. A seasonal pattern, not a forecast. This does not establish which week has the lowest prices or fewest visitors.
Daily calendar & holiday datesSeptember 2027 · historical weather & dated holidays Show calendarHide calendar
September 2027 calendar
Weather shows historical patterns, not a forecast. Holidays and events use the dates shown for 2027.
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 166° | 265° | 365° | 465° | 565° | ||
| 665° | 764° | 864° | 964° | 1064° | 1163° | 1263° |
| 1363° | 1462° | 1562° | 1661° | 1761° | 1860° | 1959° |
| 2059° | 2159° | 2258° | 2358° | 2458° | 2557° | 2657° |
| 2756° | 2856° | 2955° | 3055° |
Afternoon high rain likely (25%+) local school holidays public holiday event
School-holiday dates for September 2027 aren't available in our data yet. A day without a school marker doesn't mean schools are open.
Afternoons cool from about 65°F (18°C) in the first week to 56°F (13°C) in the last. The chance of a wet day runs 29–37%.
Crowds and cost
Visitor season
Will it be busy?
Moderate season. September averages 47% of July's overnight stays per day. Fewer overnight stays than August.
Overnight stays across Etelä-Suomi do not measure queues, day visitors or congestion at individual sights. For its size, quieter than most of Europe this month.
Accommodation price season
Will it be cheaper?
About usual. Historical regional accommodation revenue (2024–2025 monthly average): €105 per occupied unit per night. An average, not a booking quote.
Fewer overnight stays do not automatically mean cheaper rooms. Check actual quotes for your trip.
Historical accommodation average
€105
2024–2025 monthly average; accommodation revenue per occupied unit per night; not a current booking quote. −2% vs this region's usual month.
Finland as a whole
Above EU average
2024 restaurants and hotels price level: 127 where the EU average is 100. A relative index, not a room rate.
Statistics Finland 11ix covers hotels and other registered accommodation, including VAT. Units and coverage.
Year-to-year variation
How much does September vary?
Across the recorded years
In the 15 years from 2011 to 2025, the month's afternoons averaged between 56°F (13°C) and 66°F (19°C); in 11 of them they were within 3°F (1.5°C) of the typical 61°F (16°C). Rain days ranged from 4 to 18; half the years had 7–11.
Rain days in each September
Rain days
10
at least 1 mm, typical year; about 14 in a wet year
Mostly sunny days
2 of 30
cloud cover under 30%
Years with a 95°F+ day
0 of 15
no September in the last 15 years had a day at or above 95°F (35°C)
Good weather days
5 of 30
rated very good or better
See every recorded SeptemberHistorical monthly averages, year by year Show detailsHide details
| Year | Afternoon high | Rain days |
|---|---|---|
| 2011 | 61°F | 15 |
| 2012 | 59°F | 18 |
| 2013 | 60°F | 8 |
| 2014 | 62°F | 5 |
| 2015 | 62°F | 9 |
| 2016 | 62°F | 4 |
| 2017 | 59°F | 9 |
| 2018 | 63°F | 10 |
| 2019 | 59°F | 13 |
| 2020 | 62°F | 10 |
| 2021 | 56°F | 6 |
| 2022 | 56°F | 7 |
| 2023 | 65°F | 11 |
| 2024 | 66°F | 10 |
| 2025 | 64°F | 11 |
Checked against 23 local weather stations. How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 70°F | 61°F | 48°F |
| Sea | 64°F | 59°F | 52°F |
| Rain days | 12 | 10 | 11 |
| Overnight demand | 69% | 47% | 48% |
August: Warmer afternoons, warmer sea and more rain days than September. More overnight demand. August guide →
October: Cooler afternoons and cooler sea than September. October guide →
Overnight demand measures accommodation stays, not queues. Sea temperatures are monthly coastal averages.
Compare any of the 12 monthsChoose another month and compare it with September Show comparisonHide comparison
Yellow marks the top three months on the Balanced mix. September stays as your reference.
June to August have a Weather score at least 1.0 point higher than September, but more overnight stays.
Your comparison
September or August?
Overnight stays are 69% of the busiest month.
Historical regional accommodation revenue (2024–2025 monthly average): €113 per occupied unit per night. An average, not a booking quote.
Read the August guide →| Typical conditions | September | August |
|---|---|---|
| Afternoons | 61°F | 70°F |
| Nights | 46°F | 53°F |
| Sea | 59°F | 64°F |
| Rain days | 10 | 12 |
| Visitor season | Moderate season | Busy season |
| Overall / 10 | 5.6 | 6.2 |
| Month rank | #5 | #2 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Sea | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|---|
| January | 3.0 | #7 | 28°F | 18°F | 36°F | 13 | 1.0 | Low season |
| February | 3.0 | #8 | 30°F | 19°F | 34°F | 10 | 1.0 | Moderate season |
| March | 3.0 | #9 | 37°F | 23°F | 34°F | 7 | 1.0 | Moderate season |
| April | 3.7 | #6 | 48°F | 31°F | 37°F | 8 | 1.7 | Moderate season |
| May | 5.9 | #3 | 61°F | 42°F | 44°F | 7 | 4.7 | Moderate season |
| June | 6.3 | #1 | 69°F | 51°F | 54°F | 10 | 6.8 | Busy season |
| July | 5.7 | #4 | 73°F | 55°F | 62°F | 11 | 7.4 | Peak season |
| August | 6.2 | #2 | 70°F | 53°F | 64°F | 12 | 6.5 | Busy season |
| September | 5.6 | #5 | 61°F | 46°F | 59°F | 10 | 4.0 | Moderate season |
| October | 3.0 | #10 | 48°F | 37°F | 52°F | 11 | 1.0 | Moderate season |
| November | 3.0 | #11 | 40°F | 31°F | 46°F | 11 | 1.0 | Moderate season |
| December | 3.0 | #12 | 33°F | 25°F | 41°F | 14 | 1.0 | Low season |
Near here
Nearby places in September
Nearby regions, nearest first. Distances are centre to centre, as the crow flies; they are not road distances or journey times.
HelsinkiHelsinki-Uusimaa · Finland · about 40 miles
Balanced Overall 6.5 · Very good weather, 62°F (16°C) · Steady all year · Cost pricey
Western Finlandabout 110 miles
Balanced Overall 6.9 · Good weather, 60°F (15°C) · Moderate season · Cost pricey
Estoniaabout 160 miles
Balanced Overall 6.1 · Fair weather, 63°F (17°C) · Moderate season · Cost moderate
ÅlandFinland · about 180 miles
Balanced Overall 5.8 · Fair weather, 61°F (16°C) · Low season · Cost pricey
Elsewhere in Europe
Better September weather than Southern Finland
Southern Finland's weather ranks 73 of 77 beach regions this month. These beach regions outside Finland have clearly better weather on your dates, nearest first, each compared with Southern Finland.
Latviaabout 280 miles
Good weather (5.3): 4°F warmer afternoons, cheaper
East Middle Swedenabout 330 miles
Good weather (5.0): 3°F warmer afternoons, 2 fewer rain days
Skåne & southern Swedenabout 530 miles
Good weather (5.8): 5°F warmer afternoons
Gdańsk & PomeraniaPoland · about 540 miles
Good weather (6.3): 6°F warmer afternoons, 2 fewer rain days, cheaper
North JutlandDenmark · about 610 miles
Good weather (5.3): 3°F warmer afternoons, pricier
How we knowSources, regional scope & scoring method Show detailsHide details
The Finnish series covers hotels, cottages and other registered accommodation with at least 20 beds or electrical caravan pitches. A rental unit may be a room, a cottage or an electrical pitch. Prices include VAT. Accommodation coverage.
It's moderate season, 47% of the busiest month and about average for the year. That means about 8,100 overnight visitors on a typical September night across the region, 88% of them from Finland itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 1,600 more: 20 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Beach, 0–100) | 55 |
| How our weather was checked | 23 open weather stations in this region, January and July: afternoon highs typically within 1°F (0.2°C), night lows within 1°F (0.1°C). |
| Tourist nights per 1,000 residents per day | 7 |
| Busiest month here | July · 15 |
| Visitors as share of people present | 0.7% |
| Rank among Europe's regions this month | 17th percentile |
| Domestic share of nights | 88% |
| Platform rental nights per 100 counted nights | 20 |
| Visitor share if every platform night were extra | 0.8% |
| Population used | 1.2 million |
| Statistical region | FI1C · Etelä-Suomi |
Crowds: Eurostat nights spent at tourist accommodation, by month and NUTS 2 region, 2024–2025 average. Overnight visitors per night is the month's nights divided by its days; the per-1,000 figure is Eurostat's, against each year's population. Platform rentals: Eurostat nights booked via Airbnb, Booking, Expedia and Tripadvisor, 2024–2025 average, shown separately because some properties are in both counts. Weather: Holiday Climate Index computed from ERA5 reanalysis with daily highs, night lows and rain days corrected from open national weather-service station records, 2011–2025, population-weighted to the region; day-by-day figures are the same data averaged by date. Heat and rain odds are counted across those years. Sunrise and sunset: NOAA solar equations, local time. Prices: Eurostat price level index and HICP, national; the first figure is regional (Statistics Finland, StatFin 11ix: average room price per occupied room (incl. VAT)). Full method · this region's data.