Japan · 1991–2020

Best time to visit
Saijō.

May leads for comfortable weather in Saijō: typically 24.1°C by day, 14.5°C at night, with 124 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high24.1°C

Typical low14.5°C

Rain in May124 mm

Comfort

May

May · October · April

82climate match

Beach

September

September · August · May

70climate match

Outdoors

November

November · April · May

80climate match

The weakest month is July, scoring 22 against May’s 82 — 259 mm of rain falls, and days average 31.3°C, 7° 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

2610.1° / 1.8°

Feb

2411.1° / 2.1°

Mar

3414.4° / 4.9°

Apr

6119.6° / 9.7°

May

8224.1° / 14.5°

Jun

4627° / 19.1°

Jul

2231.3° / 23.5°

Aug

4032.6° / 24.4°

Sep

5129° / 20.6°

Oct

8023.7° / 14.5°

Nov

6018° / 9°

Dec

3412.7° / 4.2°

Monthly climate evidence for Saijō — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 24 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	10.1°C	1.8°C	47 mm	6.1	14.5°C	10 h 07	26	Good coverage
February	11.1°C	2.1°C	72 mm	8	13.1°C	10 h 55	24	Good coverage
March	14.4°C	4.9°C	107 mm	10	13.4°C	11 h 52	34	Good coverage
April	19.6°C	9.7°C	108 mm	8.6	15.1°C	12 h 59	61	Good coverage
May	24.1°C	14.5°C	124 mm	8.3	18.0°C	13 h 54	82	Good coverage
June	27°C	19.1°C	238 mm	11.9	21.6°C	14 h 24	46	Good coverage
July	31.3°C	23.5°C	259 mm	11.1	25.2°C	14 h 12	22	Good coverage
August	32.6°C	24.4°C	108 mm	7.9	27.5°C	13 h 25	40	Good coverage
September	29°C	20.6°C	160 mm	9	26.5°C	12 h 21	51	Good coverage
October	23.7°C	14.5°C	137 mm	7.6	23.5°C	11 h 16	80	Good coverage
November	18°C	9°C	76 mm	7.2	19.8°C	10 h 21	60	Good coverage
December	12.7°C	4.2°C	70 mm	8.1	16.7°C	9 h 54	34	Good coverage

Records at MATSUYAMA, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.3°C1 Jan 1997	-5.0°C26 Jan 1963	63 mm19 Jan 1989	157 mm1989 · driest 0 mm in 2026	76
February	24.5°C27 Feb 1954	-5.3°C16 Feb 1977	61 mm14 Feb 2016	142 mm1989 · driest 0 mm in 2026	76
March	27.5°C20 Mar 2010	-3.5°C1 Mar 1984	61 mm19 Mar 2015	205 mm1966 · driest 0 mm in 2026	76
April	33.9°C28 Apr 1998	-1.4°C2 Apr 1972	129 mm8 Apr 1974	304 mm1958 · driest 0 mm in 2025	76
May	33.3°C16 May 1994	4.3°C3 May 1957	136 mm28 May 2024	365 mm1963 · driest 0 mm in 2025	76
June	35.6°C24 Jun 2011	10.2°C1 Jun 1978	169 mm27 Jun 1979	507 mm1953 · driest 0 mm in 2025	76
July	37.0°C22 Jul 1994	15.5°C4 Jul 1966	245 mm7 Jul 2018	554 mm2020 · driest 0 mm in 2025	75
August	37.4°C7 Aug 2018	16.4°C20 Aug 1956	230 mm31 Aug 1995	372 mm2021 · driest 0 mm in 2025	75
September	35.8°C1 Sep 2010	9.6°C29 Sep 1965	188 mm18 Sep 2017	439 mm1976 · driest 0 mm in 2025	75
October	33.3°C3 Oct 2019	4.5°C31 Oct 1986	151 mm25 Oct 2013	370 mm2017 · driest 0 mm in 2025	75
November	28.0°C1 Nov 1977	0.2°C17 Nov 1956	116 mm2 Nov 2024	189 mm2024 · driest 0 mm in 2025	75
December	25.2°C4 Dec 2018	-3.1°C18 Dec 1985	90 mm5 Dec 2004	133 mm2015 · driest 0 mm in 2025	75

Typical days per month at MATSUYAMA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	4	2
February	0	0	4	2
March	<1	0	<1	4
April	2	0	0	3
May	13	<1	0	4
June	22	3	0	5
July	29	21	0	5
August	30	26	0	2
September	26	12	0	4
October	11	<1	0	3
November	<1	0	0	3
December	0	0	<1	2

How often, not how much — every day in MATSUYAMA’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%	24%	6%	22%	8.1–11.1°C
February	<1%	28%	9%	31%	8.3–12.7°C
March	3%	35%	14%	41%	12.4–15.3°C
April	30%	35%	16%	41%	18.0–20.8°C
May	62%	33%	16%	37%	22.4–24.8°C
June	58%	42%	22%	59%	25.4–27.8°C
July	65%	36%	18%	40%	29.2–32.5°C
August	75%	26%	10%	29%	30.8–33.3°C
September	66%	33%	15%	38%	26.4–30.0°C
October	65%	27%	11%	22%	21.7–24.8°C
November	20%	25%	9%	22%	16.4–19.2°C
December	<1%	23%	6%	20%	10.4–13.8°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 46-year average. Warmest: 2025. Coolest: 1980.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 1926054
NOAA station: JA000047887 · MATSUYAMA
Station distance: 37.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 33.92°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 24 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 MATSUYAMA is what differs

Matsuyama→Imabari→Iyo→Tōon→Masaki-chō→Hōjō→

Or put two places side by side: Saijō vs Matsuyama

Best time to visitSaijō.

May

September

November

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Saijō.

The whole year,
without the guesswork.

Nearby, measured,
and named.