Japan · 1991–2020

Best time to visit
Asahi.

May leads for comfortable weather in Asahi: typically 20.6°C by day, 14.7°C at night, with 137 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high20.6°C

Typical low14.7°C

Rain in May137 mm

Comfort

May

May · June · July

67climate match

Beach

August

August · July · September

79climate match

Outdoors

November

November · May · April

65climate match

The weakest month is January, scoring 19 against May’s 67 — days reach only 10°C, 14° 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

1910° / 2.6°

Feb

1910.3° / 2.8°

Mar

2312.9° / 6.1°

Apr

4817.2° / 10.4°

May

6720.6° / 14.7°

Jun

6623° / 17.8°

Jul

5926.8° / 21.2°

Aug

5928.6° / 23.2°

Sep

4926° / 21.2°

Oct

4721.5° / 16.5°

Nov

5017.3° / 10.7°

Dec

3312.6° / 5.1°

Monthly climate evidence for Asahi — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 10 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	10°C	2.6°C	99 mm	7.4	16.3°C	9 h 59	19	Strong coverage
February	10.3°C	2.8°C	94 mm	8.6	15.0°C	10 h 50	19	Good coverage
March	12.9°C	6.1°C	151 mm	12	15.0°C	11 h 51	23	Strong coverage
April	17.2°C	10.4°C	133 mm	11.7	16.3°C	13 h 03	48	Strong coverage
May	20.6°C	14.7°C	137 mm	10.5	18.5°C	14 h 02	67	Strong coverage
June	23°C	17.8°C	165 mm	11.5	20.9°C	14 h 34	66	Strong coverage
July	26.8°C	21.2°C	137 mm	10.1	23.0°C	14 h 21	59	Strong coverage
August	28.6°C	23.2°C	92 mm	6.2	25.2°C	13 h 30	59	Strong coverage
September	26°C	21.2°C	223 mm	10.8	24.5°C	12 h 22	49	Good coverage
October	21.5°C	16.5°C	274 mm	12.3	22.5°C	11 h 13	47	Strong coverage
November	17.3°C	10.7°C	134 mm	10	20.5°C	10 h 14	50	Good coverage
December	12.6°C	5.1°C	89 mm	8.1	18.2°C	9 h 45	33	Strong coverage

Records at CHOSHI, 1931–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.6°C27 Jan 1969	-6.2°C17 Jan 1970	144 mm16 Jan 2005	292 mm2005 · driest 0 mm in 2026	96
February	24.0°C14 Feb 2009	-6.1°C4 Feb 1945	130 mm15 Feb 2014	233 mm2014 · driest 0 mm in 2026	96
March	23.7°C26 Mar 2025	-3.6°C6 Mar 1977	113 mm23 Mar 1994	373 mm1989 · driest 0 mm in 2026	96
April	25.9°C20 Apr 1956	0.4°C1 Apr 2001	84 mm24 Apr 1999	266 mm2008 · driest 0 mm in 2025	96
May	29.5°C25 May 1963	5.7°C3 May 1953	102 mm23 May 1962	360 mm1965 · driest 0 mm in 2025	96
June	32.0°C30 Jun 2022	10.5°C20 Jun 1981	140 mm27 Jun 1957	331 mm1985 · driest 0 mm in 2025	96
July	34.8°C27 Jul 2005	10.5°C22 Jul 2026	201 mm15 Jul 2007	402 mm2021 · driest 0 mm in 2025	95
August	35.3°C4 Aug 1962	17.0°C13 Aug 1970	200 mm20 Aug 1960	362 mm2021 · driest 0 mm in 2025	95
September	33.7°C3 Sep 2000	12.4°C28 Sep 1992	228 mm17 Sep 1995	470 mm1971 · driest 0 mm in 2025	95
October	30.6°C7 Oct 2018	5.9°C31 Oct 1984	247 mm16 Oct 2013	712 mm1991 · driest 0 mm in 2025	95
November	24.8°C1 Nov 1977	0.9°C29 Nov 1951	112 mm28 Nov 1954	398 mm1960 · driest 0 mm in 2025	95
December	23.4°C5 Dec 2004	-3.9°C30 Dec 1947	216 mm24 Dec 1972	298 mm1972 · driest 0 mm in 2025	95

Typical days per month at CHOSHI, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	3	3
February	0	0	2	3
March	0	0	<1	5
April	0	0	0	4
May	1	0	0	4
June	7	<1	0	5
July	21	5	0	3
August	26	11	0	2
September	16	3	0	6
October	3	0	0	6
November	0	0	0	4
December	0	0	<1	3

How often, not how much — every day in CHOSHI’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%	26%	10%	28%	8.2–11.3°C
February	<1%	33%	13%	46%	8.3–11.6°C
March	<1%	42%	16%	59%	10.2–13.9°C
April	10%	41%	16%	55%	15.1–18.0°C
May	39%	39%	16%	50%	18.5–21.5°C
June	50%	43%	17%	62%	21.1–23.9°C
July	67%	33%	11%	38%	23.9–28.2°C
August	76%	25%	10%	30%	26.4–29.8°C
September	59%	40%	19%	56%	24.2–27.2°C
October	39%	42%	21%	55%	19.8–22.2°C
November	10%	35%	14%	46%	15.7–18.1°C
December	<1%	27%	9%	26%	11.0–13.9°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.

1931Each stripe is one year’s mean temperature against the 70-year average. Warmest: 2025. Coolest: 1984.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2113077
NOAA station: JA000047648 · CHOSHI
Station distance: 18.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 23 usable years
Daylight: Calculated from latitude 35.72°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 10 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 CHOSHI is what differs

Kamisu→Katori-shi→Kashima-shi→Choshi→Sawara→Hasaki→

Or put two places side by side: Asahi vs Kamisu

Best time to visitAsahi.

May

August

November

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Asahi.

The whole year,
without the guesswork.

Nearby, measured,
and named.