Japan · 1991–2020

Best time to visit
Niihama.

May leads for comfortable weather in Niihama: typically 24.9°C by day, 15°C at night, with 254 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high24.9°C

Typical low15°C

Rain in May254 mm

Comfort

May

May · October · November

60climate match

Beach

May

May · October · September

25climate match

Outdoors

November

November · December · January

76climate match

The weakest month is July, scoring 5 against May’s 60 — 393 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

3312.2° / 1.3°

Feb

2613.3° / 2.3°

Mar

3016.4° / 5.6°

Apr

4121° / 10.2°

May

6024.9° / 15°

Jun

1727.2° / 19.3°

Jul

530.9° / 23.5°

Aug

532.1° / 24.3°

Sep

1029.6° / 21°

Oct

6025° / 15°

Nov

5819.6° / 9.1°

Dec

4114.5° / 3.7°

Monthly climate evidence for Niihama — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 19 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	12.2°C	1.3°C	52 mm	4.2	14.4°C	10 h 07	33	Good coverage
February	13.3°C	2.3°C	116 mm	7.7	13.0°C	10 h 55	26	Good coverage
March	16.4°C	5.6°C	188 mm	10.1	13.3°C	11 h 52	30	Good coverage
April	21°C	10.2°C	275 mm	10.3	15.1°C	12 h 59	41	Good coverage
May	24.9°C	15°C	254 mm	9.8	18.0°C	13 h 54	60	Good coverage
June	27.2°C	19.3°C	414 mm	15.9	21.6°C	14 h 24	17	Good coverage
July	30.9°C	23.5°C	393 mm	15.6	25.2°C	14 h 12	5	Good coverage
August	32.1°C	24.3°C	350 mm	13.9	27.5°C	13 h 25	5	Good coverage
September	29.6°C	21°C	402 mm	13.5	26.6°C	12 h 21	10	Good coverage
October	25°C	15°C	254 mm	9.9	23.5°C	11 h 16	60	Good coverage
November	19.6°C	9.1°C	129 mm	7.8	19.7°C	10 h 21	58	Good coverage
December	14.5°C	3.7°C	75 mm	5.4	16.6°C	9 h 54	41	Good coverage

Records at KOCHI, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.5°C27 Jan 1969	-7.5°C16 Jan 1963	88 mm21 Jan 1974	195 mm1989 · driest 0 mm in 2011	75
February	25.2°C11 Feb 1962	-7.9°C17 Feb 1977	168 mm28 Feb 1976	322 mm1976 · driest 0 mm in 2026	75
March	25.5°C23 Mar 1958	-5.3°C5 Mar 1977	140 mm20 Mar 1975	316 mm1956 · driest 0 mm in 2026	75
April	30.0°C23 Apr 1957	-0.2°C4 Apr 1957	203 mm13 Apr 1990	582 mm1959 · driest 0 mm in 2025	75
May	32.3°C3 May 2008	6.1°C2 May 1980	242 mm16 May 1998	638 mm2006 · driest 0 mm in 2025	75
June	34.7°C23 Jun 1981	11.4°C8 Jun 1969	265 mm2 Jun 1988	931 mm1988 · driest 0 mm in 2025	75
July	38.3°C25 Jul 2001	15.7°C3 Jul 1976	278 mm28 Jul 1993	954 mm2020 · driest 0 mm in 2025	75
August	38.4°C22 Aug 1965	15.9°C26 Aug 1956	295 mm17 Aug 1975	909 mm2014 · driest 0 mm in 2025	73
September	36.9°C6 Sep 2007	10.0°C30 Sep 1965	525 mm12 Sep 1976	1418 mm1976 · driest 0 mm in 2025	73
October	32.7°C13 Oct 2025	4.3°C31 Oct 1986	192 mm28 Oct 2001	559 mm2013 · driest 0 mm in 2025	74
November	28.0°C2 Nov 1996	-1.4°C22 Nov 1966	221 mm21 Nov 1980	415 mm1961 · driest 0 mm in 2025	74
December	23.5°C3 Dec 1968	-6.1°C30 Dec 1967	107 mm3 Dec 2010	170 mm2010 · driest 0 mm in 1973	72

Typical days per month at KOCHI, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	6	2
February	0	0	4	3
March	0	0	<1	5
April	2	0	0	5
May	15	<1	0	5
June	24	3	0	8
July	28	20	0	6
August	29	25	0	5
September	27	14	0	7
October	16	<1	0	4
November	<1	0	0	3
December	0	0	2	2

How often, not how much — every day in KOCHI’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%	17%	8%	12%	10.8–13.2°C
February	1%	26%	12%	28%	11.0–14.7°C
March	7%	34%	18%	40%	14.6–17.4°C
April	41%	39%	24%	50%	19.6–21.8°C
May	61%	39%	23%	48%	23.5–25.5°C
June	50%	51%	31%	72%	26.0–27.8°C
July	56%	45%	24%	54%	29.4–32.0°C
August	59%	42%	23%	53%	31.0–33.0°C
September	56%	44%	26%	57%	27.8–30.6°C
October	66%	31%	16%	32%	23.2–25.7°C
November	35%	24%	11%	18%	17.8–20.6°C
December	3%	16%	7%	9%	12.4–15.6°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 48-year average. Warmest: 2025. Coolest: 1976.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 1855425
NOAA station: JA000047893 · KOCHI
Station distance: 49.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 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 19 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 KOCHI is what differs

Kochi→Nankoku→Yamashita→Tosayamadachō-nakano→Susaki→Tosa→

Or put two places side by side: Niihama vs Kochi

Best time to visitNiihama.

May

May

November

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Niihama.

The whole year,
without the guesswork.

Nearby, measured,
and named.