AI-generatedPorvoo at a glance
- Best time
- Jul
- Warmest month
- Jul · 22°
- Warmest sea
- Aug · 17.6°
- Sunshine a year
- 1,790 h
- Rain a year
- 638 mm
- Climate
- Continental
- Time zone
- UTC+2 / UTC+3
- Elevation
- 29 m
Climate in Porvoo
Porvoo has warm to hot summers and cold winters with occasional snow. July is the warmest month with average highs of 22 °C, while February is the coolest at −3 °C. With around 1,790 hours of sunshine a year, Porvoo is moderately sunny; July is the sunniest month with 9.4 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: July
A typical day in October
- Morning, 08:00: about 4°
- Midday, 13:00: about 8°
- Afternoon, 16:00: about 8°
- Evening, 20:00: about 7°
- Night, 23:00: about 6°
07:5518:11
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 07:29–08:55 · evening 17:11–18:37
- Blue hour
- Morning 07:12–07:29 · evening 18:37–18:54
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.
What is the weather like in Porvoo in October?
In October, Porvoo is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 10.7 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 11 rainy days and 56 mm in total. All in all, October is not an ideal month for a holiday in Porvoo.
More details for October
- Daylight
- 10 h 16 min07:55 – 18:11
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 76 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 1 day1 cm or more of fresh snowAll months
- Time zone
- UTC+3Europe/Helsinki
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 20 %51 %
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
Sea temperature in Porvoo
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 9.0 – 11.8 °C
Swimming season: Never above 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Porvoo ranges from 0.6 °C in March to 17.6 °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 16.4 and 19.1 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 1.9° | 0.5° | 3.7° | cold |
| FebruaryFeb | 0.7° | −0.1° | 1.3° | cold |
| MarchMar | 0.6° | −0.1° | 1.5° | cold |
| AprilApr | 2.3° | 1.1° | 3.3° | cold |
| MayMay | 6.5° | 5.3° | 7.7° | cold |
| JuneJun | 12.2° | 10.1° | 13.9° | cold |
| JulyJul | 16.9° | 15.0° | 19.0° | cold |
| AugustAug | 17.6° | 16.4° | 19.1° | fresh |
| SeptemberSep | 14.8° | 13.9° | 16.0° | cold |
| OctoberOct | 10.7° | 9.0° | 11.8° | cold |
| NovemberNov | 7.3° | 5.7° | 8.4° | cold |
| DecemberDec | 4.3° | 2.5° | 5.8° | cold |
Sunshine hours in Porvoo
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 2.6 of 10.3 hours of daylight in Porvoo, 25 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Porvoo
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 it, 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.
Rain in Porvoo: 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, Porvoo has about 11 rainy days with 56 mm of rain in total.
Wind and clouds in Porvoo
How breezy and how cloudy Porvoo 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 Porvoo typically peaks at 17 km/h during the day: Beaufort 3, light breeze.
Breezy months for windsurfing and kiting
The daily breeze rarely reaches Beaufort 4 (20 km/h), so wind sports depend on single windy days.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 76 % of the sky over Porvoo: mostly cloudy, with about 2.6 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 Porvoo
When Porvoo 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, Porvoo has about 1 days with at least 1 cm of fresh snow, 3 cm in total. The chance of seeing snow during a week's stay is 8 out of 100: hardly any.
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.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Porvoo
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°
- Pleasant 15–20°
ColdOctober: nights around 4°. The room should be heated.
The coolest nights are in February (−7°), the warmest in July (15°). Nights are pleasant for sleeping (15 to 20 °C) in July. 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 | 9 | −3° | −7° | 1.9° | 1.0 h | 11 | 49 |
| FebruaryFeb | 12 | −3° | −7° | 0.7° | 2.4 h | 9 | 42 |
| MarchMar | 19 | 1° | −5° | 0.6° | 4.6 h | 8 | 34 |
| AprilApr | 25 | 8° | 0° | 2.3° | 6.5 h | 9 | 36 |
| MayMay | 32 | 14° | 6° | 6.5° | 9.2 h | 10 | 47 |
| JuneJun | 28 | 19° | 11° | 12.2° | 8.9 h | 12 | 72 |
| JulyJul | 43 | 22° | 15° | 16.9° | 9.4 h | 12 | 73 |
| AugustAug | 32 | 20° | 14° | 17.6° | 7.6 h | 12 | 69 |
| SeptemberSep | 18 | 15° | 10° | 14.8° | 4.9 h | 10 | 51 |
| OctoberOct | 10 | 8° | 4° | 10.7° | 2.6 h | 11 | 56 |
| NovemberNov | 10 | 3° | 0° | 7.3° | 1.0 h | 11 | 53 |
| DecemberDec | 8 | 0° | −4° | 4.3° | 0.6 h | 12 | 55 |
Climate averages 1996–2025, 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
60.39° N, 25.67° E · 29 m · Europe/Helsinki
Best time to visit Porvoo
The best time to visit Porvoo is in July. The sea stays too cool for a classic beach holiday: even in August it only reaches 17.6 °C. For sightseeing, day trips and hiking, conditions are most comfortable in September. Rain is most frequent from June to August and in December; the wettest month is July with 73 mm.
Porvoo through the seasons
How the weather changes over the seasons, with averages for each.
Porvoo in spring
Mar – May
Poor
- 1–14 °C by day
- Sea 3 °C
- 7 h of sun a day
- 27 rainy days in all
Porvoo in summer
Jun – Aug
Poor
- 19–22 °C by day
- Sea 16 °C
- 9 h of sun a day
- 37 rainy days in all
Porvoo in autumn
Sep – Nov
Poor
- 3–15 °C by day
- Sea 11 °C
- 3 h of sun a day
- 32 rainy days in all
Porvoo in winter
Dec – Feb
Poor
- -3–0 °C by day
- Sea 2 °C
- 1 h of sun a day
- 33 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Porvoo for you.
Your best months: July
Based on the climate averages; tap a month to see its details.
Compare two months in Porvoo
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 Porvoo: score 43 against 10. 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 |
|---|---|---|
| Weather score | 10 | 43better |
| Day high | 8° | 22° |
| Night low | 4° | 15° |
| Sea | 10.7° | 16.9° |
| Sunshine | 2.6 h | 9.4 hbetter |
| Rainy days | 11better | 12 |
| Rainfall | 56 mmbetter | 73 mm |
| Muggy days | 0better | 1 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Sep
15–28 °C and not too much rain
Rainy months
Jun – Aug, Dec
12 or more rainy days
Snow
Nov – Mar
Snow on 2 or more days
Porvoo month by month
The typical weather for every month at a glance.
9January-3° · Sea 2° · 1 h
In January, Porvoo is freezing cold: daytime highs average −3 °C, and nights often drop below freezing (−7 °C). The sea averages 1.9 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Precipitation, often as snow, falls on about 11 days, totalling 49 mm. Snow falls on about 9 days. All in all, January is not an ideal month for a holiday in Porvoo.
Porvoo in January12February-3° · Sea 1° · 2 h
In February, Porvoo is freezing cold: daytime highs average −3 °C, and nights often drop below freezing (−7 °C). The sea averages 0.7 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Precipitation, often as snow, falls on about 9 days, totalling 42 mm. Snow falls on about 7 days. All in all, February is not an ideal month for a holiday in Porvoo.
Porvoo in February19March1° · Sea 1° · 5 h
In March, Porvoo is freezing cold: daytime highs average 1 °C, and nights often drop below freezing (−5 °C). The sea averages 0.6 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Precipitation, often as snow, falls on about 8 days, totalling 34 mm. Snow falls on about 6 days. All in all, March is not an ideal month for a holiday in Porvoo.
Porvoo in March25April8° · Sea 2° · 7 h
In April, Porvoo is cold: daytime highs average 8 °C, and nights cool down to about 0 °C. The sea averages 2.3 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 9 days, adding up to 36 mm. Snow falls on about 2 days. All in all, April is not an ideal month for a holiday in Porvoo.
Porvoo in April32May14° · Sea 7° · 9 h
In May, Porvoo is cool: daytime highs average 14 °C, and nights cool down to about 6 °C. The sea averages 6.5 °C – swimming is only for the hardy. With around 9 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 10 rainy days and 47 mm in total. All in all, May is not an ideal month for a holiday in Porvoo.
Porvoo in May28June19° · Sea 12° · 9 h
In June, Porvoo is mild: daytime highs average 19 °C, and nights cool down to about 11 °C. The sea averages 12.2 °C – swimming is only for the hardy. The sun shines for around 9 hours a day. Rain is frequent, with about 12 rainy days and 72 mm in total. All in all, June is not an ideal month for a holiday in Porvoo.
Porvoo in June43July22° · Sea 17° · 9 h
In July, Porvoo is warm: daytime highs average 22 °C, and nights cool down to about 15 °C. The sea averages 16.9 °C – swimming is only for the hardy. With around 9 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 12 rainy days and 73 mm in total. All in all, July is a so-so month for a holiday in Porvoo.
Porvoo in July32August20° · Sea 18° · 8 h
In August, Porvoo is mild: daytime highs average 20 °C, and nights cool down to about 14 °C. The sea averages 17.6 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain is frequent, with about 12 rainy days and 69 mm in total. All in all, August is not an ideal month for a holiday in Porvoo.
Porvoo in August18September15° · Sea 15° · 5 h
In September, Porvoo is cool: daytime highs average 15 °C, and nights cool down to about 10 °C. The sea averages 14.8 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 51 mm in total. All in all, September is not an ideal month for a holiday in Porvoo.
Porvoo in September10October8° · Sea 11° · 3 h
In October, Porvoo is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 10.7 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 11 rainy days and 56 mm in total. All in all, October is not an ideal month for a holiday in Porvoo.
Porvoo in October10November3° · Sea 7° · 1 h
In November, Porvoo is cold: daytime highs average 3 °C, and nights cool down to about 0 °C. The sea averages 7.3 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Precipitation, often as snow, falls on about 11 days, totalling 53 mm. Snow falls on about 4 days. All in all, November is not an ideal month for a holiday in Porvoo.
Porvoo in November8December0° · Sea 4° · 1 h
In December, Porvoo is freezing cold: daytime highs average 0 °C, and nights often drop below freezing (−4 °C). The sea averages 4.3 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Precipitation, often as snow, falls on about 12 days, totalling 55 mm. Snow falls on about 8 days. All in all, December is not an ideal month for a holiday in Porvoo.
Porvoo in DecemberPorvoo compared
Put Porvoo side by side with another destination.
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Porvoo vs. Helsinki
In October the holiday weather in Porvoo and Helsinki is about equally good (score 10 vs. 9). During the day Helsinki is 1 °C warmer than Porvoo. The sea is about equally warm.
| in October | Porvoo | Helsinki |
|---|---|---|
| Holiday score | 10 | 9 |
| Daytime high | 8° | 9° |
| Sea | 11° | 11° |
| Sunshine | 3 h | 3 h |
| Rainy days | 11 | 12 |
| Best time | Jul | Jun – Aug |
Through the year
Finland in October: the best places
In October, Porvoo ranks 7 of 7 destinations in this country.
- Turku9°11°19
- 2Espoo9°11°17
- 3Helsinki9°11°16
- 4Rovaniemi4°16
- 5Oulu5°8°15
- 6Vaasa7°9°11
- 7PorvooThis page8°11°10
Planning a trip to Porvoo
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Porvoo 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.
Porvoo has its best school-holiday weather during the summer holidays (score 36) and its weakest during the Christmas holidays (score 9).
- 23
Easter holidays
Mar – Apr
Poor
- 6 °C by day
- Sea 2 °C
- 5.9 h of sun a day
- 8 rainy days a month
Keep in mind: Snow
- 31
May half-term
May – Jun
Poor
- 15 °C by day
- Sea 8 °C
- 9.1 h of sun a day
- 10 rainy days a month
- 36
Summer holidays
Jul – Aug
PoorBest holidays
- 21 °C by day
- Sea 17 °C
- 8.2 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain
- 10
October half-term
Oct
Poor
- 8 °C by day
- Sea 11 °C
- 2.6 h of sun a day
- 11 rainy days a month
- 9
Christmas holidays
Dec – Jan
Poor
- −1 °C by day
- Sea 3 °C
- 0.8 h of sun a day
- 12 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 45 min
- Distance
- 1,890 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.
Frequently asked questions about Porvoo
When is the best time to visit Porvoo?
The best time to visit Porvoo 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 Porvoo?
The sea temperature in Porvoo ranges from 0.6 °C in March to 17.6 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Porvoo in October?
Only if you don't mind cold water: in October the sea averages just 10.7 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Porvoo?
July is the warmest month, with average highs of 22 °C and nights around 15 °C. February is the coolest month at −3 °C.
When does it rain most in Porvoo?
Rain is most frequent from June to August and in December; the wettest month is July with 73 mm. The driest month is March with 34 mm.
How many hours of sunshine does Porvoo get?
Porvoo gets around 1,790 hours of sunshine a year. The sunniest month is July with 9.4 hours a day; in December there are 0.6 hours a day.
What time zone is Porvoo in?
Porvoo uses the time zone Europe/Helsinki: UTC+2 in January and UTC+3 in July.
How long is the flight from London to Porvoo?
A nonstop flight from London to Porvoo takes about 2 h 45 min, for a straight-line distance of about 1,890 km.
Which school holidays are best for Porvoo?
Porvoo has its best school-holiday weather during the summer holidays (score 36) and its weakest during the Christmas holidays (score 9). Holiday ratings (0–100): Easter holidays 23, May half-term 31, Summer holidays 36, October half-term 10, Christmas holidays 9.
Near Porvoo
Other destinations close by.
Places with a climate like Porvoo
Destinations whose weather through the year is closest to Porvoo's – good alternatives.