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Finland · 1991–2020

Best time to visit
Perniö.

July leads for comfortable weather in Perniö: typically 23°C by day, 12.6°C at night, with 63 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high23°C

Typical low12.6°C

Rain in July63 mm

Comfort

July

July · August · June

84climate match

Beach

July

July · August · June

48climate match

Outdoors

June

June · August · May

88climate match

The weakest month is January, scoring 5 against July’s 84 — days reach only -1°C, 25° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

5-1° / -7°

Feb

5-1.2° / -8°

Mar

52.9° / -5.2°

Apr

229.8° / -0.2°

May

5316.3° / 4.7°

Jun

7020.2° / 9.6°

Jul

8423° / 12.6°

Aug

7321.4° / 11.4°

Sep

5316° / 7.2°

Oct

179.1° / 2.6°

Nov

53.9° / -0.8°

Dec

50.9° / -4.2°

Monthly climate evidence for Perniö — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 39 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-1°C	-7°C	50 mm	10.4	2.6°C	6 h 36	5	Good coverage
February	-1.2°C	-8°C	41 mm	8.2	1.2°C	8 h 59	5	Good coverage
March	2.9°C	-5.2°C	33 mm	7.1	1.0°C	11 h 33	5	Good coverage
April	9.8°C	-0.2°C	31 mm	6.9	2.4°C	14 h 27	22	Good coverage
May	16.3°C	4.7°C	32 mm	6.6	6.3°C	17 h 08	53	Good coverage
June	20.2°C	9.6°C	55 mm	8.8	11.4°C	18 h 53	70	Good coverage
July	23°C	12.6°C	63 mm	8.4	16.1°C	18 h 09	84	Good coverage
August	21.4°C	11.4°C	79 mm	9.9	17.2°C	15 h 40	73	Good coverage
September	16°C	7.2°C	48 mm	8.4	14.7°C	12 h 46	53	Good coverage
October	9.1°C	2.6°C	69 mm	10.5	10.8°C	9 h 58	17	Good coverage
November	3.9°C	-0.8°C	63 mm	10.7	7.6°C	7 h 20	5	Good coverage
December	0.9°C	-4.2°C	58 mm	10.7	4.9°C	5 h 51	5	Good coverage

What has changed

Perniö runs +1.9°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+2.3

Feb

+3.1

Mar

+2.6

Apr

+2.2

May

+1.3

Jun

+0.8

Jul

+1.7

Aug

+1.5

Sep

+2.1

Oct

+1.0

Nov

+2.1

Dec

+2.6

July daytime highs, 2011–2025. Last recorded: 25.5°C.

Records at SALO KARKKA, 1959–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	8.9°C10 Jan 2007	-36.6°C26 Jan 1985	27 mm8 Jan 2005	98 mm1984 · driest 6 mm in 1996	68
February	9.2°C21 Feb 1990	-37.5°C3 Feb 1966	26 mm16 Feb 2020	109 mm2020 · driest 2 mm in 1994	68
March	16.4°C27 Mar 2007	-32.5°C1 Mar 1960	28 mm8 Mar 1994	89 mm1994 · driest 1 mm in 1964	68
April	23.8°C27 Apr 1993	-21.5°C1 Apr 1963	39 mm2 Apr 2024	97 mm1977 · driest 1 mm in 2002	68
May	29.6°C24 May 2014	-6.9°C2 May 1976	25 mm26 May 2021	99 mm2021 · driest 6 mm in 1971	68
June	31.9°C22 Jun 2021	-0.9°C1 Jun 1977	39 mm23 Jun 2021	110 mm2004 · driest 3 mm in 2013	68
July	33.2°C28 Jul 2019	2.0°C6 Jul 1964	68 mm19 Jul 1973	181 mm1988 · driest 5 mm in 1994	67
August	32.5°C1 Aug 2018	0.1°C27 Aug 1973	57 mm28 Aug 1980	178 mm1967 · driest 10 mm in 1996	67
September	27.8°C5 Sep 2024	-7.9°C30 Sep 1976	36 mm3 Sep 2006	128 mm2001 · driest 5 mm in 1959	67
October	18.8°C20 Oct 1961	-16.5°C31 Oct 1992	56 mm4 Oct 2006	158 mm1980 · driest 13 mm in 2016	67
November	14.0°C3 Nov 2020	-22.6°C30 Nov 2010	30 mm5 Nov 2000	152 mm1996 · driest 1 mm in 1993	67
December	10.8°C6 Dec 2006	-34.1°C31 Dec 1978	29 mm13 Dec 1964	147 mm1974 · driest 0 mm in 2001	67

Typical days per month at SALO KARKKA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	26	1
February	0	0	25	<1
March	0	0	24	<1
April	0	0	16	<1
May	2	0	4	<1
June	4	<1	0	2
July	9	1	0	2
August	5	<1	0	3
September	<1	0	2	1
October	0	0	10	2
November	0	0	15	2
December	0	0	22	2

How often, not how much — every day in SALO KARKKA’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	34%	3%	44%	-6.4–1.5°C
February	0%	27%	2%	31%	-6.3–2.3°C
March	0%	24%	2%	27%	-0.5–5.2°C
April	2%	23%	2%	27%	6.1–11.7°C
May	20%	21%	3%	23%	13.7–18.6°C
June	43%	27%	4%	32%	18.1–22.9°C
July	57%	30%	7%	38%	20.1–25.5°C
August	43%	35%	8%	48%	18.5–22.9°C
September	9%	32%	5%	40%	13.0–17.3°C
October	0%	33%	6%	46%	6.9–11.1°C
November	0%	38%	6%	52%	0.7–6.3°C
December	0%	37%	4%	50%	-3.8–3.7°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1961Each stripe is one year’s mean temperature against the 65-year average. Warmest: 2020. Coolest: 1985.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 642113
NOAA station: FIE00142035 · SALO KARKKA
Station distance: 19.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 60.20°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 39 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from SALO KARKKA is what differs

Salo→Halikko→Pertteli→Marttila→Kuusjoki→Muurla→

Or put two places side by side: Perniö vs Salo

Best time to visitPerniö.

July

July

June

The whole year,without the guesswork.

Perniö runs +1.9°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Perniö.

The whole year,
without the guesswork.

Perniö runs +1.9°C
on the 1961–1990 baseline.

Nearby, measured,
and named.