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Finland · 1991–2020

Best time to visit
Port Arthur.

July leads for comfortable weather in Port Arthur: typically 23.3°C by day, 13.8°C at night, with 68 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high23.3°C

Typical low13.8°C

Rain in July68 mm

Comfort

July

July · August · June

86climate match

Beach

July

July · August · June

51climate match

Outdoors

June

June · May · September

91climate match

The weakest month is January, scoring 5 against July’s 86 — days reach only -0.9°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

5-0.9° / -6.2°

Feb

5-0.8° / -6.4°

Mar

53° / -4.4°

Apr

229.6° / 0.3°

May

5416.2° / 5.8°

Jun

7220.1° / 10.1°

Jul

8623.3° / 13.8°

Aug

7621.6° / 12.8°

Sep

5616.5° / 8.8°

Oct

199.5° / 3.5°

Nov

55.1° / 0.7°

Dec

52.1° / -2.6°

Monthly climate evidence for Port Arthur — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 35 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-0.9°C	-6.2°C	52 mm	10.6	2.0°C	6 h 32	5	Good coverage
February	-0.8°C	-6.4°C	39 mm	8.5	0.9°C	8 h 57	5	Good coverage
March	3°C	-4.4°C	33 mm	7.7	0.8°C	11 h 32	5	Good coverage
April	9.6°C	0.3°C	32 mm	7	2.3°C	14 h 29	22	Good coverage
May	16.2°C	5.8°C	36 mm	6.9	6.2°C	17 h 12	54	Good coverage
June	20.1°C	10.1°C	50 mm	8.1	11.4°C	18 h 59	72	Good coverage
July	23.3°C	13.8°C	68 mm	8.3	16.0°C	18 h 14	86	Good coverage
August	21.6°C	12.8°C	75 mm	10.5	17.1°C	15 h 42	76	Good coverage
September	16.5°C	8.8°C	57 mm	9.1	14.1°C	12 h 46	56	Good coverage
October	9.5°C	3.5°C	73 mm	11.3	10.1°C	9 h 57	19	Good coverage
November	5.1°C	0.7°C	74 mm	13	7.0°C	7 h 17	5	Good coverage
December	2.1°C	-2.6°C	77 mm	13	4.3°C	5 h 46	5	Good coverage

Records at TURKU ARTUKAINEN, 2003–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	9.2°C21 Jan 2020	-25.4°C19 Jan 2013	17 mm12 Jan 2021	104 mm2008 · driest 8 mm in 2010	23
February	9.4°C28 Feb 2021	-25.4°C20 Feb 2011	28 mm16 Feb 2024	94 mm2020 · driest 7 mm in 2007	24
March	15.0°C27 Mar 2007	-20.4°C10 Mar 2013	16 mm13 Mar 2023	73 mm2023 · driest 6 mm in 2016	24
April	23.9°C30 Apr 2008	-9.9°C1 Apr 2003	26 mm29 Apr 2015	55 mm2006 · driest 3 mm in 2009	24
May	29.4°C15 May 2018	-3.7°C1 May 2007	39 mm30 May 2007	71 mm2021 · driest 9 mm in 2024	24
June	31.6°C28 Jun 2022	-0.3°C7 Jun 2009	33 mm27 Jun 2007	75 mm2024 · driest 11 mm in 2023	24
July	33.6°C27 Jul 2018	4.5°C6 Jul 2009	46 mm24 Jul 2009	119 mm2009 · driest 23 mm in 2010	23
August	33.0°C7 Aug 2023	3.3°C31 Aug 2007	69 mm26 Aug 2012	146 mm2023 · driest 23 mm in 2020	23
September	27.5°C5 Sep 2024	-1.3°C23 Sep 2019	44 mm21 Sep 2010	115 mm2010 · driest 17 mm in 2014	23
October	17.5°C2 Oct 2006	-12.6°C27 Oct 2012	32 mm4 Oct 2012	168 mm2006 · driest 9 mm in 2016	23
November	14.1°C12 Nov 2022	-18.6°C29 Nov 2010	25 mm25 Nov 2024	112 mm2006 · driest 29 mm in 2018	23
December	10.6°C20 Dec 2015	-23.4°C24 Dec 2010	28 mm7 Dec 2007	147 mm2011 · driest 23 mm in 2016	23

Typical days per month at TURKU ARTUKAINEN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	25	1
February	0	0	25	<1
March	0	0	24	<1
April	0	0	13	<1
May	2	0	3	<1
June	4	<1	<1	1
July	10	2	0	2
August	5	<1	0	2
September	0	0	<1	2
October	0	0	7	2
November	0	0	12	2
December	0	0	19	2

How often, not how much — every day in TURKU ARTUKAINEN’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%	35%	4%	47%	-4.9–2.0°C
February	0%	28%	2%	33%	-5.0–2.8°C
March	0%	24%	2%	28%	-0.1–6.2°C
April	<1%	22%	2%	27%	7.4–11.3°C
May	21%	20%	3%	24%	14.1–18.7°C
June	46%	26%	4%	30%	18.0–22.8°C
July	63%	27%	7%	33%	20.8–26.4°C
August	50%	35%	8%	45%	20.2–22.9°C
September	12%	30%	7%	39%	14.6–18.5°C
October	0%	37%	7%	49%	7.6–11.5°C
November	0%	41%	6%	58%	2.3–7.0°C
December	0%	40%	6%	52%	-2.3–5.2°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.

2004Each stripe is one year’s mean temperature against the 22-year average. Warmest: 2020. Coolest: 2010.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 7627400
NOAA station: FIE00142010 · TURKU ARTUKAINEN
Station distance: 3.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 60.45°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 35 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 TURKU ARTUKAINEN is what differs

Turku→Raisio→Naantali→I kaupunginosa→VI kaupunginosa→Martti→

Or put two places side by side: Port Arthur vs Turku

Best time to visitPort Arthur.

July

July

June

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Port Arthur.

The whole year,
without the guesswork.

Nearby, measured,
and named.