Pori weather in May

In May, Pori sees average daytime highs of 12°C and overnight lows near 5°C, with 39 mm of precipitation across 7.8 wet days and about 17.1 hours of daylight. It is the 5th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 10°C in the first days to 14°C by the end. The sky is clear or mostly clear about 35% of the time in May, and the air most often feels dry.

Daylight stretches from about 15 h 48 min at the start of May to 18 h 18 min by month's end. Set against the rest of the year, May is Pori's 1st-clearest and 9th-windiest month. For the whole year in context, see Pori's year-round climate.

Daytime high
12°
5th warmest
Overnight low
8th coldest
Precipitation
39 mm
7.8 wet days
Daylight
17 h 06 min
3:55 AM – 9:03 PM
Cloud cover
55%
1st clearest
Wind
14 km/h
9th windiest
Solar energy
5.61 kWh/m²
Travel score
3.3
out of 10
Air quality
Excellent
PM10 12.2 µg/m³ · 2019

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 10°C in the first days to 14°C by the end.

A typical May day in Pori reaches about 12°C in the afternoon and slips back to 5°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 17°C. Set against its neighbours, May runs about 5°C warmer than April and about 4°C cooler than June.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1103
2103
3103
4103
5103
6103
7114
8114
9114
10114
11114
12114
13125
14125
15125
16125
17125
18125
19126
20136
21136
22136
23136
24136
25137
26137
27147
28147
29147
30147
31148

How May really feels in Pori

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 6 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
6
wind chill below the day's low

The story in May is cold — wind chill drags the overnight "feels like" below the raw low.

Pori weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -5°4310.28.560.0
Feb-2° / -6°3487.68.40.0
Mar / -4°338.3611.30.0
Apr / 338.2214.30.8
May12° / 397.80.217.13.3
Jun16° / 10°6010.3018.95.0
Jul20° / 13°7411.7018.16.0
Aug19° / 13°7412.2015.65.7
Sep14° / 6210.2012.64.1
Oct / 6511.50.99.61.3
Nov / 5611.13.76.80.0
Dec / -3°5311.56.85.10.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in May, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 18% of May, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25248
35248
45347
55347
65347
75446
85446
95446
105446
115446
125545
135446
145446
155446
165446
175347
185347
195347
205248
215248
225248
235248
245347
255347
265347
275347
285347
295347
305347
315446

Chance of precipitation in May

Any precipitationSnow

Pori gets around 39 mm of rain and snow over 7.8 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 25% and peaks near 28% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1232
2232
3232
4232
5231
6231
7241
8241
9241
10241
11241
12241
13241
14251
15251
16251
17261
18261
19271
20271
21270
22270
23270
24270
25270
26270
27270
28280
29280
30280
31280

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27982
28982
29982
30982
31982

Wind in May

Winds average 14 km/h in May.

Across May, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 15 h 48 min at the start of May to 18 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 150 minutes over May. Sunrise moves from 4:36 AM to 3:22 AM, and sunset from 8:24 PM to 9:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.84:368:24
215.94:338:26
316.04:308:29
416.14:288:32
516.24:258:35
616.34:228:37
716.34:198:40
816.44:168:43
916.54:138:45
1016.64:118:48
1116.74:088:50
1216.84:058:53
1316.94:038:56
1417.04:008:58
1517.13:579:01
1617.13:559:03
1717.23:529:06
1817.33:509:09
1917.43:479:11
2017.53:459:14
2117.63:439:16
2217.63:409:18
2317.73:389:21
2417.83:369:23
2517.93:349:26
2617.93:329:28
2718.03:299:30
2818.13:279:32
2918.13:269:34
3018.23:249:37
3118.33:229:39

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.61 kWh/m².

For context, solar energy here swings from a low near 0.12 kWh/m² to a high of 5.97 kWh/m² in June across the year — May's 5.61 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
14.9Bright
25.0Bright
35.0Bright
45.1Bright
55.2Bright
65.2Bright
75.3Bright
85.3Bright
95.4Bright
105.4Bright
115.5Bright
125.5Bright
135.5Bright
145.6Bright
155.6Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
286.0Bright
296.0Bright
306.0Bright
316.0Intense
Planning a trip in May

Is May a good time to visit Pori?

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

3.3
Sightseeing
5th-best month of the year
0.0
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Pori.

What to pack for Pori in May

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

In May, Pori sees daytime highs around 12°C and nights near 5°C. Pack a warm layer. Worth having: sun protection. About 8 days see rain.

a warm layersun protection

Sea temperature near Pori in May

The nearest coast averages about 5°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 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
May5Bracing
Jun10Bracing
Jul15Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Pori in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Pori peaks around June 16 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowJun 16UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar1Low
Apr2Moderate
May4Moderate
Jun5Moderate
Jul4Moderate
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Pori?

Pori sits at 61.5°N, 21.8°E, 20 m above sea level, in Finland. The nearest listed city is Rauma, 42 km away.

NokiaYlöjärviLoimaaPirkkalaLempäälä

Topography around Pori

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Pori.

Within 3 km, the terrain around Pori has only modest variations in elevation — a maximum elevation change of 35 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 74 m; within 80 km, significant variations in elevation — a maximum elevation change of 253 m.

The land around Pori is covered by trees (39%) and artificial surfaces (33%) within 3 km, trees (62%) within 16 km, and trees (61%) and water (25%) within 80 km.

3 km
35 m
16 km
74 m
80 km
253 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Rauma 42 km · Vammala 62 km · Sastamala 62 km · Nokia 91 km · Ylöjärvi 96 km · Loimaa 98 km · Pirkkala 98 km · Lempäälä 106 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 Pori (61.4807°, 21.7852°, elevation 20 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).