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Finland · 1991–2020

Best time to visit
Siikajoki.

July leads for comfortable weather in Siikajoki: typically 21.2°C by day, 10.7°C at night, with 77 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high21.2°C

Typical low10.7°C

Rain in July77 mm

Comfort

July

July · August · June

71climate match

Beach

July

July · August · June

33climate match

Outdoors

June

June · August · July

81climate match

The weakest month is January, scoring 5 against July’s 71 — days reach only -4.7°C, 29° 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

5-4.7° / -11.9°

Feb

5-4.6° / -12.3°

Mar

50.2° / -8.5°

Apr

76.5° / -2.7°

May

3613.3° / 2.3°

Jun

6018.3° / 7.6°

Jul

7121.2° / 10.7°

Aug

6219.1° / 9°

Sep

3913.4° / 4.9°

Oct

55.9° / 0.1°

Nov

50.6° / -4.3°

Dec

5-2.5° / -8.4°

Monthly climate evidence for Siikajoki — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 9 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-4.7°C	-11.9°C	36 mm	8.8	0.1°C	5 h 01	5	Strong coverage
February	-4.6°C	-12.3°C	30 mm	8.2	-0.3°C	8 h 16	5	Strong coverage
March	0.2°C	-8.5°C	28 mm	7.7	-0.2°C	11 h 26	5	Strong coverage
April	6.5°C	-2.7°C	24 mm	6.1	0.3°C	15 h 00	7	Strong coverage
May	13.3°C	2.3°C	42 mm	8.2	2.9°C	18 h 33	36	Strong coverage
June	18.3°C	7.6°C	53 mm	8.7	9.4°C	21 h 38	60	Strong coverage
July	21.2°C	10.7°C	77 mm	10.2	14.5°C	20 h 10	71	Strong coverage
August	19.1°C	9°C	70 mm	10	15.3°C	16 h 32	62	Strong coverage
September	13.4°C	4.9°C	53 mm	8.7	12.1°C	12 h 55	39	Strong coverage
October	5.9°C	0.1°C	54 mm	10.1	7.7°C	9 h 30	5	Strong coverage
November	0.6°C	-4.3°C	47 mm	10.2	4.0°C	6 h 05	5	Strong coverage
December	-2.5°C	-8.4°C	42 mm	10.1	1.5°C	3 h 48	5	Strong coverage

What has changed

Siikajoki 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

+2.0

Feb

+2.7

Mar

+2.0

Apr

+1.8

May

+1.3

Jun

+0.9

Jul

+1.6

Aug

+1.9

Sep

+2.3

Oct

+1.0

Nov

+2.2

Dec

+2.9

July daytime highs, 2011–2025. Last recorded: 24.5°C.

Records at SIIKAJOKI REVONLAHTI, 1959–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	10.3°C11 Jan 1971	-39.4°C28 Jan 1999	15 mm1 Jan 1988	76 mm1983 · driest 7 mm in 1964	68
February	8.7°C23 Feb 1990	-41.9°C3 Feb 1966	20 mm22 Feb 2020	69 mm2020 · driest 4 mm in 2018	68
March	11.3°C28 Mar 2021	-34.0°C5 Mar 1981	25 mm26 Mar 1961	68 mm1961 · driest 5 mm in 1964	68
April	21.9°C30 Apr 1998	-23.8°C2 Apr 1960	26 mm21 Apr 1964	72 mm1973 · driest 3 mm in 2019	68
May	28.7°C19 May 2014	-10.0°C1 May 1976	31 mm31 May 1983	96 mm1983 · driest 3 mm in 2024	68
June	31.3°C13 Jun 2006	-3.1°C3 Jun 1964	35 mm14 Jun 1981	112 mm2000 · driest 7 mm in 2003	68
July	33.0°C29 Jul 2010	0.1°C4 Jul 1986	53 mm22 Jul 2020	191 mm1998 · driest 2 mm in 2019	68
August	30.7°C1 Aug 2018	-3.1°C29 Aug 1984	57 mm7 Aug 2012	147 mm1959 · driest 11 mm in 2006	67
September	25.9°C6 Sep 1968	-9.6°C30 Sep 1978	47 mm16 Sep 2020	137 mm1970 · driest 16 mm in 2008	67
October	20.8°C14 Oct 2018	-22.1°C25 Oct 1968	50 mm11 Oct 2023	125 mm2023 · driest 4 mm in 2016	67
November	11.6°C2 Nov 2015	-36.7°C29 Nov 1980	27 mm17 Nov 2006	95 mm1996 · driest 8 mm in 1993	67
December	8.0°C2 Dec 2024	-37.3°C31 Dec 2002	18 mm5 Dec 1979	85 mm2013 · driest 9 mm in 1978	67

Typical days per month at SIIKAJOKI REVONLAHTI, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	30	<1
February	0	0	27	<1
March	0	0	28	<1
April	0	0	21	<1
May	<1	0	10	<1
June	2	<1	<1	2
July	5	<1	0	2
August	2	<1	<1	2
September	0	0	5	1
October	0	0	14	1
November	0	0	22	<1
December	0	0	28	<1

How often, not how much — every day in SIIKAJOKI REVONLAHTI’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%	28%	<1%	36%	-10.9–-1.8°C
February	0%	27%	<1%	29%	-9.9–-0.8°C
March	0%	23%	<1%	26%	-3.5–2.3°C
April	<1%	20%	1%	20%	3.2–8.1°C
May	10%	25%	3%	29%	10.4–16.4°C
June	27%	28%	5%	36%	16.0–20.7°C
July	41%	31%	6%	42%	18.5–23.6°C
August	25%	34%	8%	45%	16.1–20.6°C
September	4%	32%	4%	41%	10.5–14.9°C
October	0%	32%	4%	43%	3.0–8.0°C
November	0%	35%	2%	47%	-3.0–3.0°C
December	0%	32%	<1%	39%	-8.7–0.4°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.

1960Each stripe is one year’s mean temperature against the 66-year average. Warmest: 2020. Coolest: 1985.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 637002
NOAA station: FIE00145627 · SIIKAJOKI REVONLAHTI
Station distance: 21.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 64.81°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 9 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 SIIKAJOKI REVONLAHTI is what differs

Raahe→Ruukki→Vihanti→Rantsila→Ylipää→Ylipää→

Or put two places side by side: Siikajoki vs Raahe

Best time to visitSiikajoki.

July

July

June

The whole year,without the guesswork.

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

Nearby, measured,and named.

Best time to visit
Siikajoki.

The whole year,
without the guesswork.

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

Nearby, measured,
and named.