Japan · 1991–2020

Best time to visit
Ōkagō.

May leads for comfortable weather in Ōkagō: typically 22.5°C by day, 16.4°C at night, with 317 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high22.5°C

Typical low16.4°C

Rain in May317 mm

Comfort

May

May · April · August

42climate match

Beach

August

August · July · January

42climate match

Outdoors

April

April · December · February

38climate match

The weakest month is March, scoring 5 against May’s 42 — 372 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

613° / 7.1°

Feb

813.6° / 7.2°

Mar

516.2° / 9.2°

Apr

3619.4° / 12.6°

May

4222.5° / 16.4°

Jun

924.6° / 19.6°

Jul

1628.2° / 23.5°

Aug

2729.7° / 24.4°

Sep

528° / 22.4°

Oct

524.3° / 18.6°

Nov

2720.3° / 14.1°

Dec

1915.8° / 9.7°

Monthly climate evidence for Ōkagō — 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	13°C	7.1°C	252 mm	18	19.8°C	10 h 11	6	Good coverage
February	13.6°C	7.2°C	258 mm	16.4	18.8°C	10 h 57	8	Good coverage
March	16.2°C	9.2°C	372 mm	19.2	18.9°C	11 h 53	5	Good coverage
April	19.4°C	12.6°C	273 mm	15.3	19.8°C	12 h 57	36	Good coverage
May	22.5°C	16.4°C	317 mm	15.1	21.7°C	13 h 51	42	Good coverage
June	24.6°C	19.6°C	506 mm	18.9	23.3°C	14 h 19	9	Good coverage
July	28.2°C	23.5°C	354 mm	14.2	26.0°C	14 h 08	16	Good coverage
August	29.7°C	24.4°C	234 mm	13.5	27.7°C	13 h 22	27	Good coverage
September	28°C	22.4°C	460 mm	19.1	27.3°C	12 h 20	5	Good coverage
October	24.3°C	18.6°C	652 mm	20.4	25.6°C	11 h 18	5	Good coverage
November	20.3°C	14.1°C	364 mm	17.1	23.5°C	10 h 24	27	Good coverage
December	15.8°C	9.7°C	266 mm	15.9	21.3°C	9 h 58	19	Good coverage

Records at HACHIJOJIMA, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.5°C27 Jan 1969	-1.8°C22 Jan 1997	145 mm11 Jan 1972	633 mm1954 · driest 0 mm in 2026	74
February	21.9°C15 Feb 2009	-2.0°C27 Feb 1981	166 mm3 Feb 2002	501 mm2010 · driest 0 mm in 2026	73
March	22.7°C19 Mar 2013	-1.9°C5 Mar 1990	169 mm7 Mar 2016	588 mm1999 · driest 0 mm in 2026	74
April	26.3°C26 Apr 1998	4.5°C2 Apr 1985	310 mm13 Apr 1985	533 mm1985 · driest 0 mm in 2025	74
May	27.4°C14 May 1994	8.7°C5 May 1991	193 mm2 May 2012	847 mm2008 · driest 0 mm in 2025	75
June	30.4°C30 Jun 2004	13.6°C9 Jun 1969	242 mm18 Jun 1992	724 mm1998 · driest 0 mm in 2023	75
July	32.9°C10 Jul 1990	15.6°C5 Jul 1976	194 mm21 Jul 2006	771 mm2019 · driest 0 mm in 2025	74
August	33.5°C31 Aug 2010	18.6°C9 Aug 1958	340 mm29 Aug 1953	646 mm1953 · driest 0 mm in 2025	74
September	33.2°C6 Sep 2010	15.0°C29 Sep 1951	425 mm25 Sep 1965	820 mm1965 · driest 0 mm in 2025	72
October	29.9°C2 Oct 2016	12.0°C19 Oct 1957	398 mm8 Oct 1988	1063 mm1955 · driest 0 mm in 2025	74
November	26.3°C1 Nov 2000	2.1°C26 Nov 1995	290 mm20 Nov 1993	664 mm1962 · driest 0 mm in 2025	70
December	24.6°C19 Dec 1953	1.4°C26 Dec 1995	174 mm28 Dec 1965	436 mm1965 · driest 0 mm in 2025	73

Typical days per month at HACHIJOJIMA, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	0	0	5
February	0	0	5
March	0	0	8
April	0	0	6
May	3	0	6
June	11	<1	8
July	27	6	5
August	30	12	4
September	25	5	7
October	10	0	9
November	<1	0	7
December	0	0	5

How often, not how much — every day in HACHIJOJIMA’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	<1%	50%	20%	68%	11.7–14.7°C
February	<1%	54%	22%	75%	11.7–15.1°C
March	2%	55%	28%	78%	14.2–17.2°C
April	26%	49%	26%	66%	18.4–20.4°C
May	50%	48%	25%	64%	21.4–23.1°C
June	48%	55%	32%	74%	23.4–25.5°C
July	62%	39%	19%	42%	26.7–29.1°C
August	58%	43%	17%	55%	28.7–30.3°C
September	47%	54%	28%	74%	26.6–28.8°C
October	43%	58%	34%	77%	22.8–24.9°C
November	25%	53%	28%	73%	18.8–21.1°C
December	3%	46%	18%	60%	14.2–17.0°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 41-year average. Warmest: 1959. Coolest: 1984.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 1854372
NOAA station: JA000047678 · HACHIJOJIMA
Station distance: 1.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 33.10°, 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 HACHIJOJIMA is what differs

Hachijō→Toriuchi→Sueyoshi→Nakanogō→Mitsune→Kanado→

Or put two places side by side: Ōkagō vs Hachijō

Best time to visitŌkagō.

May

August

April

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Ōkagō.

The whole year,
without the guesswork.

Nearby, measured,
and named.