Porvoo in Summer
In summer (June, July and August), Porvoo sees average daytime highs around 21°C and overnight lows near 12°C, with 204 mm of rain over about 35 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 21°C. The sky is clear or mostly clear about 20% of the time across summer, and the air most often feels dry.
Summer is Porvoo's best season of the year to visit on our travel score. For the whole year in context, see Porvoo's year-round climate.
- Avg daytime high
- 21°C
- warmest season of the year
- Avg overnight low
- 12°C
- Rainfall
- 204 mm
- 35 wet days
- Avg wind
- 11 km/h
- Travel score
- 6.1
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Porvoo in Summer
Across summer, daytime highs hold fairly steady around 21°C.
A typical summer day in Porvoo reaches about 21°C and drops to 12°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Porvoo
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Porvoo weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -2° / -7° | 45 | 10.7 | 10.5 | 6.3 | 0.0 |
| Feb | -2° / -8° | 39 | 9 | 8.9 | 8.6 | 0.0 |
| Mar | 2° / -5° | 36 | 8.5 | 7.4 | 11.3 | 0.0 |
| Apr | 9° / 0° | 36 | 8.8 | 2.3 | 14.2 | 1.7 |
| May | 15° / 5° | 45 | 9.4 | 0.1 | 16.8 | 4.8 |
| Jun | 19° / 10° | 71 | 11.9 | 0 | 18.5 | 5.8 |
| Jul | 22° / 13° | 68 | 11.2 | 0 | 17.8 | 6.4 |
| Aug | 21° / 12° | 65 | 11.7 | 0 | 15.4 | 6.1 |
| Sep | 15° / 8° | 51 | 9.9 | 0 | 12.6 | 4.5 |
| Oct | 8° / 3° | 55 | 10.4 | 0.8 | 9.7 | 1.4 |
| Nov | 3° / -1° | 54 | 10.9 | 4.7 | 7.1 | 0.0 |
| Dec | -0° / -4° | 53 | 11.7 | 9.3 | 5.5 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 20% of the time across summer.
Chance of precipitation in Summer
Porvoo gets around 204 mm of rain over 35 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 11 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 18 hours in early June to 14 h 06 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.0 kWh/m².
Is summer a good time to visit Porvoo?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Porvoo for sightseeing.
What to pack for Porvoo in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Porvoo sees daytime highs around 21°C and nights near 12°C. Worth packing: light clothes, rain gear and sun protection. About 35 days see rain.
Sea temperature near Porvoo in Summer
The nearest coast averages about 15°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 30 km away) 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 2 | 1 | 1 | 2 | 6 | 12 | 16 | 17 | 15 | 10 | 7 | 4 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 2 | Bracing |
| Feb | 1 | Bracing |
| Mar | 1 | Bracing |
| Apr | 2 | Bracing |
| May | 6 | Bracing |
| Jun | 12 | Bracing |
| Jul | 16 | Cool |
| Aug | 17 | Cool |
| Sep | 15 | Bracing |
| Oct | 10 | Bracing |
| Nov | 7 | Bracing |
| Dec | 4 | Bracing |
UV index in Porvoo in Summer
Clear-sky midday UV across summer averages around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Porvoo 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 1 | 2 | 3 | 4 | 5 | 5 | 4 | 2 | 1 | 0 | 0 |
| Level | Low | Low | Low | Moderate | Moderate | High | Moderate | Moderate | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 1 | Low |
| Mar | 2 | Low |
| Apr | 3 | Moderate |
| May | 4 | Moderate |
| Jun | 5 | High |
| Jul | 5 | Moderate |
| Aug | 4 | Moderate |
| Sep | 2 | Moderate |
| Oct | 1 | Low |
| Nov | 0 | Low |
| Dec | 0 | Low |
Where is Porvoo?
Porvoo sits at 60.4°N, 25.7°E, 29 m above sea level, in Finland. The nearest listed city is Sibbo, 22 km away.
Topography around Porvoo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Porvoo.
Within 3 km, the terrain around Porvoo has only modest variations in elevation — a maximum elevation change of 58 m around an average of 20 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 98 m; within 80 km, only modest variations in elevation — a maximum elevation change of 226 m.
The land around Porvoo is covered by trees (51%) and artificial surfaces (22%) within 3 km, trees (61%) within 16 km, and trees (43%) and water (42%) within 80 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
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 Porvoo (60.3923°, 25.6651°, elevation 29 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.