Porvoo weather in August

In August, Porvoo sees average daytime highs of 21°C and overnight lows near 12°C, with 65 mm of rain across 11.7 wet days and about 15.4 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 19°C by the end. The sky is clear or mostly clear about 18% of the time in August, and the air most often feels dry.

Daylight stretches from about 16 h 42 min at the start of August to 14 h 06 min by month's end. Set against the rest of the year, August is Porvoo's 4th-clearest and 11th-windiest month. For the whole year in context, see Porvoo's year-round climate.

Daytime high
21°
2nd warmest
Overnight low
12°
11th coldest
Rainfall
65 mm
11.7 wet days
Daylight
15 h 24 min
4:39 AM – 8:04 PM
Cloud cover
67%
4th clearest
Wind
11 km/h
11th windiest
Solar energy
4.07 kWh/m²
Travel score
6.1
out of 10

Porvoo is urban area in Porvoo, Finland.

Air quality
Good
PM10 16.6 µg/m³ · 2016

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 22°C in the first days to 19°C by the end.

A typical August day in Porvoo reaches about 21°C in the afternoon and slips back to 12°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 26°C. Set against its neighbours, August runs about 1°C cooler than July and about 6°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12313
22313
32213
42213
52213
62213
72213
82213
92213
102212
112212
122112
132112
142112
152112
162112
172112
182112
192011
202011
212011
222011
232011
242011
251911
261911
271911
281910
291910
301810
311810

How August really feels in Porvoo

Once humidity and wind are folded in, August 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

August 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 August compares with the rest of the year at a glance. August is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -7°4510.710.56.30.0
Feb-2° / -8°3998.98.60.0
Mar / -5°368.57.411.30.0
Apr / 368.82.314.21.7
May15° / 459.40.116.84.8
Jun19° / 10°7111.9018.55.8
Jul22° / 13°6811.2017.86.4
Aug21° / 12°6511.7015.46.1
Sep15° / 519.9012.64.5
Oct / 5510.40.89.71.4
Nov / -1°5410.94.77.10.0
Dec-0° / -4°5311.79.35.50.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24159
34159
43961
53961
63862
73862
83862
93862
103763
113763
123763
133763
143862
153862
163763
173763
183763
193565
203565
213565
223466
233367
243367
253268
263169
273169
283070
293070
302971
312872

Chance of precipitation in August

Any precipitation

Porvoo gets around 65 mm of rain over 11.7 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
234
334
435
535
636
736
837
937
1038
1138
1239
1339
1439
1540
1640
1740
1840
1940
2040
2139
2239
2339
2439
2538
2638
2737
2837
2936
3036
3136

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15335102
25335102
3543592
4543592
5553591
6563581
7563581
8573571
9573571
10573571
11593560
12593560
13603460
14603460
15623350
16623350
17623350
18633340
19643240
20643240
21643240
22663130
23673030
24673030
25682930
26702820
27712720
28722620
29732520
30742420
31752320

Wind in August

Winds average 11 km/h in August.

Across August, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 16 h 42 min at the start of August to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 156 minutes over August. Sunrise moves from 4:02 AM to 5:16 AM, and sunset from 8:45 PM to 7:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.74:028:45
216.64:048:43
316.64:078:40
416.54:098:37
516.44:118:35
616.34:148:32
716.24:168:30
816.14:198:27
916.04:218:24
1016.04:248:21
1115.94:268:19
1215.84:298:16
1315.74:318:13
1415.64:348:10
1515.54:368:07
1615.44:398:04
1715.34:418:01
1815.34:437:59
1915.24:467:56
2015.14:487:53
2115.04:517:50
2214.94:537:47
2314.84:567:44
2414.74:587:41
2514.65:017:37
2614.55:037:34
2714.45:067:31
2814.35:087:28
2914.25:117:25
3014.15:137:22
3114.15:167:19

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.07 kWh/m².

For context, solar energy here swings from a low near 0.14 kWh/m² to a high of 5.57 kWh/m² in June across the year — August's 4.07 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.0Bright
184.0Moderate
193.9Moderate
203.8Moderate
213.8Moderate
223.7Moderate
233.7Moderate
243.6Moderate
253.5Moderate
263.5Moderate
273.4Moderate
283.4Moderate
293.3Moderate
303.2Moderate
313.2Moderate
Planning a trip in August

Is August a good time to visit Porvoo?

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

6.1
Sightseeing
2nd-best month of the year
3.5
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Porvoo for sightseeing.

What to pack for Porvoo in August

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

In August, Porvoo sees daytime highs around 21°C and nights near 12°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Porvoo in August

The nearest coast averages about 17°C in August — 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.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May6Bracing
Jun12Bracing
Jul16Cool
Aug17Cool
Sep15Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Porvoo in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 4 — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateModerateLowJun 18UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

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.

3 km
58 m
16 km
98 m
80 km
226 m
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Sibbo 22 km · Kerava 31 km · Järvenpää 33 km · Mäntsälä 33 km · Tuusula 35 km · Vuosaari 35 km · Mellunkylä 36 km · Vantaa 36 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 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. 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).