Japan · 1991–2020

Best time to visit
Itoman.

December leads for comfortable weather in Itoman: typically 21.6°C by day, 16.5°C at night, with 109 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortDecember

Typical high21.6°C

Typical low16.5°C

Rain in December109 mm

Comfort

December

December · November · January

73climate match

Beach

November

November · October · April

63climate match

Outdoors

January

January · February · December

68climate match

The weakest month is August, scoring 13 against December’s 73 — 257 mm of rain falls, and days average 31.7°C, 8° above 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

6719.7° / 14.7°

Feb

6720.2° / 14.7°

Mar

6622° / 16.5°

Apr

6624.4° / 19°

May

3627.1° / 22°

Jun

1829.8° / 25.3°

Jul

2331.9° / 27°

Aug

1331.7° / 26.8°

Sep

1530.6° / 25.7°

Oct

4528.2° / 23.3°

Nov

6925.1° / 20.2°

Dec

7321.6° / 16.5°

Monthly climate evidence for Itoman — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 4 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	19.7°C	14.7°C	109 mm	11.8	22.6°C	10 h 40	67	Strong coverage
February	20.2°C	14.7°C	126 mm	10.6	21.7°C	11 h 14	67	Good coverage
March	22°C	16.5°C	150 mm	12.1	21.8°C	11 h 56	66	Strong coverage
April	24.4°C	19°C	163 mm	11.1	22.8°C	12 h 44	66	Strong coverage
May	27.1°C	22°C	263 mm	12.7	24.7°C	13 h 25	36	Strong coverage
June	29.8°C	25.3°C	295 mm	11.9	26.8°C	13 h 46	18	Strong coverage
July	31.9°C	27°C	192 mm	10.7	28.7°C	13 h 37	23	Strong coverage
August	31.7°C	26.8°C	257 mm	13.8	28.9°C	13 h 03	13	Strong coverage
September	30.6°C	25.7°C	287 mm	12.2	28.3°C	12 h 17	15	Strong coverage
October	28.2°C	23.3°C	182 mm	9.8	27.1°C	11 h 30	45	Strong coverage
November	25.1°C	20.2°C	126 mm	9	25.4°C	10 h 50	69	Strong coverage
December	21.6°C	16.5°C	109 mm	9.7	23.9°C	10 h 31	73	Strong coverage

Records at NAHA, 1961–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	27.0°C25 Jan 2020	6.1°C25 Jan 2016	104 mm25 Jan 1966	275 mm1966 · driest 0 mm in 2026	66
February	26.7°C15 Feb 2020	7.0°C18 Feb 1978	112 mm26 Feb 1972	342 mm1998 · driest 0 mm in 2026	66
March	28.2°C26 Mar 1999	7.8°C1 Mar 1963	166 mm12 Mar 1983	424 mm1983 · driest 0 mm in 2026	66
April	29.9°C27 Apr 2022	10.4°C3 Apr 1974	166 mm15 Apr 2024	531 mm1980 · driest 0 mm in 2025	66
May	31.6°C25 May 1963	10.2°C1 May 2026	179 mm3 May 2020	637 mm1966 · driest 0 mm in 2025	66
June	34.1°C28 Jun 2001	16.7°C6 Jun 1978	214 mm15 Jun 2023	858 mm2005 · driest 0 mm in 2025	66
July	35.1°C16 Jul 2017	19.6°C1 Jul 2026	359 mm9 Jul 2014	511 mm1961 · driest 0 mm in 2025	66
August	35.6°C9 Aug 2001	20.7°C28 Aug 1965	336 mm12 Aug 2007	745 mm2023 · driest 0 mm in 2025	65
September	34.6°C12 Sep 2009	18.5°C27 Sep 1972	412 mm22 Sep 1999	1082 mm2001 · driest 0 mm in 2025	65
October	33.6°C3 Oct 2025	16.4°C29 Oct 1980	243 mm5 Oct 1998	692 mm1998 · driest 0 mm in 2025	65
November	30.8°C7 Nov 2008	12.9°C26 Nov 1995	263 mm14 Nov 1971	370 mm1971 · driest 0 mm in 2025	65
December	29.4°C4 Dec 2018	9.4°C29 Dec 1967	143 mm6 Dec 1985	264 mm2000 · driest 0 mm in 2025	65

Typical days per month at NAHA, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	<1	0	4
February	1	0	3
March	5	0	5
April	13	0	4
May	26	2	6
June	29	15	6
July	30	28	4
August	30	28	4
September	29	21	5
October	28	5	4
November	15	<1	3
December	3	0	3

How often, not how much — every day in NAHA’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	23%	40%	12%	56%	17.6–20.7°C
February	27%	42%	13%	58%	17.8–21.1°C
March	40%	41%	15%	57%	19.8–23.0°C
April	60%	37%	15%	48%	22.9–25.4°C
May	58%	42%	21%	59%	25.6–28.1°C
June	58%	43%	21%	54%	28.0–30.7°C
July	65%	35%	12%	47%	30.5–32.6°C
August	54%	46%	18%	61%	30.2–32.4°C
September	59%	42%	16%	54%	29.2–31.2°C
October	68%	32%	11%	40%	26.5–29.2°C
November	65%	33%	11%	42%	23.4–25.7°C
December	46%	34%	11%	45%	19.8–22.5°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 44-year average. Warmest: 1998. Coolest: 1968.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 1861280
NOAA station: JA000047936 · NAHA
Station distance: 8.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 23 usable years
Daylight: Calculated from latitude 26.13°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 4 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 NAHA is what differs

Naha→Tomigusuku→Nanjō→Kanegusuku→Yaese→Zamami→

Or put two places side by side: Itoman vs Naha

Best time to visitItoman.