Pori, Finland climate

Dfb Warm-summer humid continental

Pori has a seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 22°C, while the coldest is January averaging around −7°C at night. Around 606 mm of precipitation falls each year, peaking in September (69 mm) and easing off in March (28 mm). At latitude 61°N, day length swings from 5.0 hours in midwinter to 19.0 hours at midsummer.

☀️ Summers

Mild

Highs near 22°C in July.

❄️ Winters

Very cold

Lows near −7°C in January.

About 132 freezing nights a year

🌧️ Rain

Moderate rainfall

About 606 mm of rain a year.

Wettest in September

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Pori climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−2	−1	3	9	16	19	22	21	16	9	5	1
Avg temp (°C)	−5	−4	−1	4	11	15	18	16	12	6	2	−1
Avg low (°C)	−7	−6	−4	0	6	10	13	12	8	3	0	−4
Precipitation (mm)	36	32	28	31	42	58	67	61	69	62	62	58

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	−2	−1	3	9	16	19
Avg temp (°C)	−5	−4	−1	4	11	15
Avg low (°C)	−7	−6	−4	0	6	10
Precipitation (mm)	36	32	28	31	42	58

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	22	21	16	9	5	1
Avg temp (°C)	18	16	12	6	2	−1
Avg low (°C)	13	12	8	3	0	−4
Precipitation (mm)	67	61	69	62	62	58

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	14	12	11	10	9	10	10	11	12	15	17	19
Days with high ≥ 32°C (days)	—	—	—	—	—	—	0.5	0.1	—	—	—	—
Days with low ≤ 0°C (days)	25	23	23	14	3	—	—	—	0.4	9	14	22

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	14	12	11	10	9	10
Days with high ≥ 32°C (days)	—	—	—	—	—	—
Days with low ≤ 0°C (days)	25	23	23	14	3	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	11	12	15	17	19
Days with high ≥ 32°C (days)	0.5	0.1	—	—	—	—
Days with low ≤ 0°C (days)	—	—	0.4	9	14	22

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	81	76	68	60	56	61	60	61	66	75	82	81
Clear days (≤ 30% cloud)	0.7	2	3	6	7	5	6	6	4	2	0.5	0.7
Partly cloudy days (30–70%)	7	8	12	12	13	12	12	12	10	9	7	7
Cloudy days (≥ 70%)	23	18	16	12	11	13	13	14	16	20	23	23
Relative humidity (%)	96	96	91	83	79	79	81	83	87	91	94	96
Wind speed (mph)	3.4	3.0	2.8	2.4	2.0	2.0	2.2	2.6	3.0	3.2	3.2	3.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	81	76	68	60	56	61
Clear days (≤ 30% cloud)	0.7	2	3	6	7	5
Partly cloudy days (30–70%)	7	8	12	12	13	12
Cloudy days (≥ 70%)	23	18	16	12	11	13
Relative humidity (%)	96	96	91	83	79	79
Wind speed (mph)	3.4	3.0	2.8	2.4	2.0	2.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	60	61	66	75	82	81
Clear days (≤ 30% cloud)	6	6	4	2	0.5	0.7
Partly cloudy days (30–70%)	12	12	10	9	7	7
Cloudy days (≥ 70%)	13	14	16	20	23	23
Relative humidity (%)	81	83	87	91	94	96
Wind speed (mph)	2.2	2.6	3.0	3.2	3.2	3.4

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 12 years of daily observations at Pori Rautatieasema, a weather station, inside the city. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →