AI-generatedNaantali at a glance
- Best time
- Jul
- Warmest month
- Jul · 23°
- Warmest sea
- Aug · 17.3°
- Sunshine a year
- 1,860 h
- Rain a year
- 652 mm
- Climate
- Continental
- Time zone
- UTC+2 / UTC+3
- Elevation
- 9 m
Climate in Naantali
Naantali has mild to warm summers and cold winters with occasional snow. July is the warmest month with average highs of 23 °C, while February is the coolest at −1 °C. With around 1,860 hours of sunshine a year, Naantali is moderately sunny; July is the sunniest month with 9.5 hours a day.
Holiday weather through the year
Best time to visit Naantali
The best time to visit Naantali is in July. The sea stays too cool for a classic beach holiday: even in August it only reaches 17.3 °C. For sightseeing, day trips and hiking, conditions are most comfortable from May to June and in September. Rain is frequent in August and in December; the wettest month is July with 82 mm.
Naantali through the seasons
How the weather changes over the seasons, with averages for each.
Naantali in spring
Mar – May
Poor
- 3–16 °C by day
- Sea 3 °C
- 6.8 h of sun a day
- 24 rainy days in all
Naantali in summer
Jun – Aug
Fair
- 20–23 °C by day
- Sea 15 °C
- 8.9 h of sun a day
- 36 rainy days in all
Naantali in autumn
Sep – Nov
Poor
- 4–16 °C by day
- Sea 11 °C
- 3.1 h of sun a day
- 33 rainy days in all
Naantali in winter
Dec – Feb
Poor
- −1–1 °C by day
- Sea 3 °C
- 1.5 h of sun a day
- 32 rainy days in all
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
May – Jun, Sep
15–28 °C and not too much rain
Rainy months
Aug, Dec
Rainy season or more than 12 rainy days
Snow
Nov – Mar
Snow on 2 or more days
Find your perfect month
Tell us what you like and we rate every month in Naantali for you.
Your best months: July
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Poor
Best time to visit: July
Where to go in OctoberSea temperature in October
A typical day in October
- Morning, 08:00: about 4°
- Midday, 13:00: about 9°
- Afternoon, 16:00: about 9°
- Evening, 20:00: about 7°
- Night, 23:00: about 5°
08:1018:25
Cold evenings: bring a warm jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:43–09:09 · evening 17:26–18:52
- Blue hour
- Morning 07:27–07:43 · evening 18:52–19:08
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in Naantali compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 12° at the start of the month to 7° at the end. The sea cools from 12° to 9°. The days get 2.7 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 12° | 7° |
| Night-time low | 5° | 1° |
| Sea | 12° | 9° |
| Daylight | 11.5 h | 8.9 h |
What is the weather like in Naantali in October?
In October, Naantali is cold: daytime highs average 9 °C, and nights cool down to about 3 °C. The sea averages 10.5 °C – swimming is only for the hardy. The sun is scarce, with only about 2.8 hours a day. Rain is frequent, with about 12 rainy days and 64 mm in total. All in all, October is not an ideal month for a holiday in Naantali.
More details for October
- Daylight
- 10 h 16 min08:10 – 18:25
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 72 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3offset from UTC
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 20 %46 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Warm jacket
- Rain jacket or umbrella
Compare two months in Naantali
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Naantali: score 50 against 9. In July, days are 14 °C warmer than in October. The sea is 6 °C warmer in July. July has one more rainy day. The sun shines 7 hours longer a day in July.
| Month | October | July |
|---|---|---|
| Holiday weather score | 9 | 50better |
| Daytime high | 9° | 23° |
| Night-time low | 3° | 13° |
| Sea | 10.5° | 16.6° |
| Sunshine | 2.8 h | 9.5 hbetter |
| Rainy days | 12better | 13 |
| Rainfall | 64 mmbetter | 82 mm |
| Muggy days | 0better | 1 |
Based on the climate averages 1996–2025.
Naantali month by month
The typical weather for every month at a glance.
11January−1° · Sea 2° · 1.3 h
In January, Naantali is bitterly cold: daytime highs average −1 °C, and nights often drop below freezing (−6 °C). The sea averages 2.1 °C – swimming is only for the hardy. The sun is scarce, with only about 1.3 hours a day. Precipitation falls on about 11 days, totalling 50 mm; on about 7 of them it snows. All in all, January is not an ideal month for a holiday in Naantali.
Naantali in January13February−1° · Sea 1° · 2.4 h
In February, Naantali is bitterly cold: daytime highs average −1 °C, and nights often drop below freezing (−7 °C). The sea averages 0.9 °C – swimming is only for the hardy. The sun is scarce, with only about 2.4 hours a day. Precipitation falls on about 9 days, totalling 38 mm; on about 6 of them it snows. All in all, February is not an ideal month for a holiday in Naantali.
Naantali in February20March3° · Sea 1° · 4.5 h
In March, Naantali is cold: daytime highs average 3 °C, and nights often drop below freezing (−4 °C). The sea averages 0.9 °C – swimming is only for the hardy. Expect around 4.5 hours of sunshine a day. Precipitation falls on about 8 days, totalling 32 mm; on about 4 of them it snows. All in all, March is not an ideal month for a holiday in Naantali.
Naantali in March28April10° · Sea 3° · 6.8 h
In April, Naantali is cold: daytime highs average 10 °C, and nights cool down to about 0 °C. The sea averages 2.5 °C – swimming is only for the hardy. The sun shines for around 6.8 hours a day. Rain falls on about 8 days, adding up to 32 mm. All in all, April is not an ideal month for a holiday in Naantali.
Naantali in April33May16° · Sea 7° · 9.1 h
In May, Naantali is cool: daytime highs average 16 °C, and nights cool down to about 5 °C. The sea averages 6.5 °C – swimming is only for the hardy. With around 9.1 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 9 rainy days and 40 mm in total. All in all, May is not an ideal month for a holiday in Naantali.
Naantali in May36June20° · Sea 12° · 9.4 h
In June, Naantali is mild: daytime highs average 20 °C, and nights cool down to about 10 °C. The sea averages 12.0 °C – swimming is only for the hardy. With around 9.4 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 10 rainy days and 61 mm in total. All in all, June is not an ideal month for a holiday in Naantali.
Naantali in June50July23° · Sea 17° · 9.5 h
In July, Naantali is warm: daytime highs average 23 °C, and nights cool down to about 13 °C. The sea averages 16.6 °C – swimming is only for the hardy. With around 9.5 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 13 rainy days and 82 mm in total. All in all, July is a so-so month for a holiday in Naantali – and yet one of the best months here.
Naantali in July39August22° · Sea 17° · 7.7 h
In August, Naantali is warm: daytime highs average 22 °C, and nights cool down to about 12 °C. The sea averages 17.3 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7.7 hours a day. Rain is frequent, with about 13 rainy days and 80 mm in total. All in all, August is not an ideal month for a holiday in Naantali.
Naantali in August20September16° · Sea 14° · 5.4 h
In September, Naantali is mild: daytime highs average 16 °C, and nights cool down to about 8 °C. The sea averages 14.4 °C – swimming is only for the hardy. Expect around 5.4 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 59 mm in total. All in all, September is not an ideal month for a holiday in Naantali.
Naantali in September9October9° · Sea 11° · 2.8 h
In October, Naantali is cold: daytime highs average 9 °C, and nights cool down to about 3 °C. The sea averages 10.5 °C – swimming is only for the hardy. The sun is scarce, with only about 2.8 hours a day. Rain is frequent, with about 12 rainy days and 64 mm in total. All in all, October is not an ideal month for a holiday in Naantali.
Naantali in October9November4° · Sea 7° · 1.1 h
In November, Naantali is cold: daytime highs average 4 °C, and nights cool down to about −1 °C. The sea averages 7.3 °C – swimming is only for the hardy. The sun is scarce, with only about 1.1 hours a day. Rain is frequent, with about 12 rainy days and 58 mm in total. Snow falls on about 3 days. All in all, November is not an ideal month for a holiday in Naantali.
Naantali in November8December1° · Sea 4° · 0.8 h
In December, Naantali is bitterly cold: daytime highs average 1 °C, and nights often drop below freezing (−4 °C). The sea averages 4.4 °C – swimming is only for the hardy. The sun is scarce, with only about 0.8 hours a day. Precipitation falls on about 12 days, totalling 57 mm; on about 5 of them it snows. All in all, December is not an ideal month for a holiday in Naantali.
Naantali in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Naantali
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
ColdOctober: nights around 3°. The room should be heated.
The coolest nights are in February (−7°), the warmest in July (13°). Nights fall below 8 °C on average from October to May, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 11 | −1° | −6° | 2.1° | 1.3 h | 11 | 50 |
| FebruaryFeb | 13 | −1° | −7° | 0.9° | 2.4 h | 9 | 38 |
| MarchMar | 20 | 3° | −4° | 0.9° | 4.5 h | 8 | 32 |
| AprilApr | 28 | 10° | 0° | 2.5° | 6.8 h | 8 | 32 |
| MayMay | 33 | 16° | 5° | 6.5° | 9.1 h | 9 | 40 |
| JuneJun | 36 | 20° | 10° | 12.0° | 9.4 h | 10 | 61 |
| JulyJul | 50 | 23° | 13° | 16.6° | 9.5 h | 13 | 82 |
| AugustAug | 39 | 22° | 12° | 17.3° | 7.7 h | 13 | 80 |
| SeptemberSep | 20 | 16° | 8° | 14.4° | 5.4 h | 10 | 59 |
| OctoberOct | 9 | 9° | 3° | 10.5° | 2.8 h | 12 | 64 |
| NovemberNov | 9 | 4° | −1° | 7.3° | 1.1 h | 12 | 58 |
| DecemberDec | 8 | 1° | −4° | 4.4° | 0.8 h | 12 | 57 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
60.47° N, 22.02° E · 9 m · Europe/Helsinki
Sea temperature in Naantali
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 9.2 – 11.9 °C
Swimming season: Always below 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Naantali ranges from 0.9 °C in February to 17.3 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea warms up slowly: it is warmest in August, while the air already peaks in July. From October to February the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 15.8 and 18.8 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 2.1° | 0.6° | 3.6° | cold |
| FebruaryFeb | 0.9° | −0.1° | 2.2° | cold |
| MarchMar | 0.9° | 0.1° | 2.1° | cold |
| AprilApr | 2.5° | 1.2° | 3.8° | cold |
| MayMay | 6.5° | 5.5° | 7.7° | cold |
| JuneJun | 12.0° | 10.2° | 14.4° | cold |
| JulyJul | 16.6° | 14.8° | 18.4° | cold |
| AugustAug | 17.3° | 15.8° | 18.8° | fresh |
| SeptemberSep | 14.4° | 13.3° | 15.8° | cold |
| OctoberOct | 10.5° | 9.2° | 11.9° | cold |
| NovemberNov | 7.3° | 5.9° | 8.5° | cold |
| DecemberDec | 4.4° | 2.9° | 5.7° | cold |
Sunshine hours in Naantali
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 2.8 of 10.3 hours of daylight in Naantali, 27 % of the daylight hours.
Sunshine hours: measured at the weather station 9 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
Rain in Naantali: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Naantali has about 12 rainy days with 64 mm of rain in total.
UV index in Naantali
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 1 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 6).
Minutes until sunburn in October
- Very fair skin
- over 2 h
- Fair skin
- over 2 h
- Light brown skin
- over 2 h
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind and clouds in Naantali
How breezy and how cloudy Naantali is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Naantali typically peaks at 21 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting: Oct – Feb.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 72 % of the sky over Naantali: mostly cloudy, with about 2.8 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Snow in Naantali
When Naantali is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, it hardly ever snows in Naantali.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Planning a trip to Naantali
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Naantali in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Naantali has its best school-holiday weather during the summer holidays (score 43) and its weakest during October half-term (score 9).
- 26
Easter holidays
Mar – Apr
Poor
- 8 °C by day
- Sea 2 °C
- 6.1 h of sun a day
- 8 rainy days a month
Keep in mind: Snow
- 34
May half-term
May – Jun
Poor
- 17 °C by day
- Sea 8 °C
- 9.2 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
- 43
Summer holidays
Jul – Aug
FairBest holidays
- 22 °C by day
- Sea 17 °C
- 8.3 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 9
October half-term
Oct
Poor
- 9 °C by day
- Sea 11 °C
- 2.8 h of sun a day
- 12 rainy days a month
- 10
Christmas holidays
Dec – Jan
Poor
- 0 °C by day
- Sea 3 °C
- 1.1 h of sun a day
- 11 rainy days a month
Keep in mind: Frequent rain, Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 2 h 35 min
- Distance
- 1,710 km
- Time zone
- UTC+3
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Compare & alternatives
Naantali compared
Put Naantali side by side with another destination.
Naantali vs Turku
In October the holiday weather in Naantali and Turku is about equally good (score 9 vs 10). During the day it is about as warm in Turku as in Naantali. The sea is about equally warm.
| in October | Naantali | Turku |
|---|---|---|
| Holiday weather score | 9 | 10 |
| Daytime high | 9° | 9° |
| Sea | 11° | 11° |
| Sunshine | 3 h | 3 h |
| Rainy days | 12 | 11 |
| Best time | Jul | May – Aug |
Through the year
Finland in October: the best places
In October, Naantali ranks 25 among the 31 nearest destinations in this country.
- Turku9°11°21
- 2Espoo9°11°21
- 3Helsinki9°11°20
- 4Vantaa9°19
- 5Seinäjoki7°16
- 6Kokkola7°9°16
- 7Rovaniemi4°16
- 8Nokia8°15
- 25NaantaliThis page9°11°9
Near Naantali
Other destinations close by.
Places with a climate like Naantali
Destinations whose weather through the year is closest to Naantali's – good alternatives.
Frequently asked questions about Naantali
When is the best time to visit Naantali?
The best time to visit Naantali is in July. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Naantali?
The sea temperature in Naantali ranges from 0.9 °C in February to 17.3 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Naantali in October?
Only if you don't mind cold water: in October the sea averages just 10.5 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Naantali?
July is the warmest month, with average highs of 23 °C and nights around 13 °C. February is the coolest month at −1 °C.
When does it rain most in Naantali?
Rain is frequent in August and in December; the wettest month is July with 82 mm. The driest month is March with 32 mm.
How many hours of sunshine does Naantali get?
Naantali gets around 1,860 hours of sunshine a year. The sunniest month is July with 9.5 hours a day; in December there are 0.8 hours a day.
What time zone is Naantali in?
Naantali is on UTC+2 in January and UTC+3 in July.
How long is the flight from London to Naantali?
A nonstop flight from London to Naantali takes about 2 h 35 min, for a straight-line distance of about 1,710 km.
Which school holidays are best for Naantali?
Naantali has its best school-holiday weather during the summer holidays (score 43) and its weakest during October half-term (score 9). Holiday ratings (0–100): Easter holidays 26, May half-term 34, summer holidays 43, October half-term 9, Christmas holidays 10.