Japan · 1991–2020

Best time to visit
Shimonoseki.

October leads for comfortable weather in Shimonoseki: typically 23°C by day, 16.5°C at night, with 104 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high23°C

Typical low16.5°C

Rain in October104 mm

Comfort

October

October · May · November

81climate match

Beach

September

September · October · August

58climate match

Outdoors

November

November · April · October

77climate match

The weakest month is July, scoring 9 against October’s 81 — 365 mm of rain falls.

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

219.8° / 4.5°

Feb

2610.6° / 4.6°

Mar

3413.7° / 6.9°

Apr

5418.3° / 11.3°

May

7522.8° / 15.8°

Jun

4525.8° / 19.9°

Jul

929.8° / 24.2°

Aug

2931.3° / 25.6°

Sep

4627.8° / 22.2°

Oct

8123° / 16.5°

Nov

6117.5° / 11.2°

Dec

3312.3° / 6.8°

Monthly climate evidence for Shimonoseki — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 20 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	9.8°C	4.5°C	88 mm	10.1	13.2°C	10 h 07	21	Good coverage
February	10.6°C	4.6°C	79 mm	9.1	11.8°C	10 h 55	26	Good coverage
March	13.7°C	6.9°C	117 mm	10	12.1°C	11 h 52	34	Good coverage
April	18.3°C	11.3°C	135 mm	9.8	14.1°C	12 h 59	54	Good coverage
May	22.8°C	15.8°C	143 mm	8.1	17.4°C	13 h 54	75	Good coverage
June	25.8°C	19.9°C	269 mm	11.7	21.3°C	14 h 24	45	Good coverage
July	29.8°C	24.2°C	365 mm	13.2	25.1°C	14 h 12	9	Good coverage
August	31.3°C	25.6°C	191 mm	9.3	27.4°C	13 h 25	29	Good coverage
September	27.8°C	22.2°C	183 mm	11.1	25.9°C	12 h 21	46	Good coverage
October	23°C	16.5°C	104 mm	6.5	22.8°C	11 h 16	81	Good coverage
November	17.5°C	11.2°C	81 mm	7.8	19.4°C	10 h 21	61	Good coverage
December	12.3°C	6.8°C	85 mm	10.1	16.1°C	9 h 54	33	Good coverage

What has changed

Shimonoseki runs +1.5°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

+1.4

Feb

+1.4

Mar

+2.1

Apr

+1.6

May

+1.7

Jun

+1.4

Jul

+1.5

Aug

+1.2

Sep

+1.3

Oct

+1.6

Nov

+1.2

Dec

+1.3

October daytime highs, 2011–2025. Last recorded: 24.7°C.

Records at SHIMONOSEKI, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.7°C10 Jan 1953	-6.1°C5 Jan 1970	57 mm26 Jan 2002	176 mm1972 · driest 0 mm in 2026	75
February	23.7°C22 Feb 2021	-6.4°C16 Feb 1977	61 mm29 Feb 2004	204 mm1989 · driest 0 mm in 2026	75
March	27.0°C30 Mar 1979	-4.7°C5 Mar 1977	86 mm10 Mar 2020	259 mm1991 · driest 25 mm in 1973	75
April	29.7°C28 Apr 1983	0.5°C1 Apr 1972	172 mm15 Apr 1955	344 mm1955 · driest 0 mm in 2025	75
May	30.9°C25 May 2000	7.1°C1 May 1965	149 mm11 May 2011	386 mm1963 · driest 0 mm in 2025	74
June	35.1°C29 Jun 2022	12.0°C1 Jun 1978	266 mm28 Jun 1953	936 mm1953 · driest 0 mm in 2025	74
July	36.2°C17 Jul 1994	15.1°C4 Jul 1966	212 mm6 Jul 2018	951 mm1980 · driest 0 mm in 2025	75
August	37.0°C10 Aug 1960	18.5°C23 Aug 1977	189 mm14 Aug 2021	720 mm2021 · driest 0 mm in 2025	73
September	35.0°C3 Sep 1983	12.9°C28 Sep 1987	219 mm14 Sep 1990	452 mm2004 · driest 0 mm in 2024	73
October	30.8°C4 Oct 2022	7.7°C28 Oct 1958	124 mm14 Oct 1951	290 mm2017 · driest 0 mm in 2025	74
November	26.9°C8 Nov 2015	1.4°C30 Nov 1970	137 mm2 Nov 2024	251 mm2024 · driest 0 mm in 2025	74
December	26.2°C4 Dec 2018	-3.5°C27 Dec 1976	90 mm5 Dec 2004	133 mm2004 · driest 0 mm in 2020	74

Typical days per month at SHIMONOSEKI, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	<1	2
February	0	0	<1	2
March	<1	0	0	4
April	<1	0	0	4
May	6	<1	0	4
June	18	1	0	5
July	27	16	0	6
August	30	22	0	4
September	25	7	0	4
October	7	0	0	2
November	<1	0	0	2
December	0	0	0	2

How often, not how much — every day in SHIMONOSEKI’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%	9%	41%	7.6–10.8°C
February	<1%	35%	10%	43%	7.8–11.9°C
March	1%	37%	14%	46%	11.5–14.7°C
April	19%	36%	18%	44%	16.6–19.6°C
May	58%	33%	17%	37%	20.9–23.5°C
June	61%	40%	23%	53%	23.9–26.6°C
July	62%	39%	22%	42%	27.4–31.2°C
August	70%	31%	14%	37%	29.1–32.4°C
September	65%	36%	18%	44%	25.6–28.8°C
October	65%	25%	10%	22%	21.2–23.9°C
November	15%	29%	9%	32%	15.7–18.8°C
December	<1%	31%	7%	34%	10.0–13.3°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.

1951Each stripe is one year’s mean temperature against the 47-year average. Warmest: 2025. Coolest: 1963.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 1852225
NOAA station: JA000047762 · SHIMONOSEKI
Station distance: 0.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 33.96°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 20 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 SHIMONOSEKI is what differs

Kitakyushu→Ube→Yukuhashi→Sanyōonoda→Nōgata→Nakama→

Or put two places side by side: Shimonoseki vs Kitakyushu

Best time to visitShimonoseki.

October

September

November

The whole year,without the guesswork.

Shimonoseki runs +1.5°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Shimonoseki.

The whole year,
without the guesswork.

Shimonoseki runs +1.5°C
on the 1961–1990 baseline.

Nearby, measured,
and named.