Tsu climate

Name: Tsu
Address: JP

Tsu is warmest in August, with average highs of 30 °C, and coldest in January, when nights average 2.5 °C. September is the wettest month (260 mm) and December the driest (68 mm). Figures are 1991–2020 climate normals.

Across a full year Tsu averages 1,884 mm of rain, 106 days above 25 °C and 5 days below freezing.

Japan · population 274,537 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 30 °C
Coldest month January 2.5 °C
Driest month December 68 mm
Wettest month September 260 mm
Least cloud December 42 % cloud
Hottest on record July 38 °C
Coldest on record January -2.7 °C
Warmest sea August 27 °C

What to expectTsu through the year

Tsu has a clear annual cycle: average daily highs run from 8.7 °C in January to 30 °C in August, a swing of 22 °C in mean temperature across the year.

Counted across a normal year, 106 days a year reach 25 °C, 34 of them reach 30 °C, 5 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in July.

Rain is strongly seasonal. September averages 260 mm against 68 mm in December — 3.8 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Tsu is warmest in August at 27 °C and coldest in February at 14 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	8.7 °C	69 mm	45 %
February	9.6 °C	77 mm	51 %
March	13.1 °C	127 mm	55 %
April	18.0 °C	148 mm	58 %
May	22.3 °C	173 mm	67 %
June	25.5 °C	240 mm	79 %
July	29.3 °C	218 mm	74 %
August	30.3 °C	172 mm	63 %
September	26.8 °C	260 mm	64 %
October	21.6 °C	229 mm	55 %
November	16.3 °C	104 mm	47 %
December	11.1 °C	68 mm	42 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	8.7 °C	2.5 °C	5.3 °C	16.9 °C	-2.7 °C	0	0	2
February	9.6 °C	2.7 °C	5.8 °C	19.9 °C	-2.3 °C	0	0	2
March	13.1 °C	5.2 °C	8.8 °C	23.1 °C	-0.8 °C	0	0	0
April	18.0 °C	9.8 °C	13.6 °C	26.8 °C	1.0 °C	0	0	0
May	22.3 °C	14.5 °C	18.2 °C	31.2 °C	6.4 °C	5	0	0
June	25.5 °C	19.0 °C	22.0 °C	34.2 °C	12.2 °C	17	2	0
July	29.3 °C	23.2 °C	26.0 °C	38.4 °C	17.4 °C	29	13	0
August	30.3 °C	24.2 °C	26.9 °C	37.6 °C	18.3 °C	30	17	0
September	26.8 °C	20.9 °C	23.5 °C	36.0 °C	12.3 °C	22	3	0
October	21.6 °C	15.3 °C	18.1 °C	29.3 °C	7.3 °C	3	0	0
November	16.3 °C	9.6 °C	12.7 °C	27.1 °C	2.6 °C	0	0	0
December	11.1 °C	4.7 °C	7.6 °C	21.7 °C	-1.2 °C	0	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	69 mm	6	10 h/day	45 %	70 %	23 km/h	14.3 °C
February	77 mm	8	11 h/day	51 %	70 %	23 km/h	13.5 °C
March	127 mm	11	12 h/day	55 %	71 %	23 km/h	13.7 °C
April	148 mm	11	13 h/day	58 %	73 %	21 km/h	15.4 °C
May	173 mm	12	14 h/day	67 %	77 %	19 km/h	18.5 °C
June	240 mm	15	14 h/day	79 %	82 %	17 km/h	21.8 °C
July	218 mm	17	14 h/day	74 %	84 %	15 km/h	25.4 °C
August	172 mm	16	13 h/day	63 %	82 %	16 km/h	27.4 °C
September	260 mm	16	12 h/day	64 %	81 %	18 km/h	25.7 °C
October	229 mm	11	11 h/day	55 %	78 %	18 km/h	22.5 °C
November	104 mm	8	10 h/day	47 %	75 %	18 km/h	19.6 °C
December	68 mm	7	9.8 h/day	42 %	72 %	21 km/h	16.7 °C

How Tsu compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Tsu	30 °C	2.5 °C	1,884 mm	106
Matsusaka · Japan	30 °C	2.1 °C	1,965 mm	106
Yokkaichi · Japan	30 °C	0.7 °C	1,707 mm	106
Nishio · Japan	30 °C	1.4 °C	1,497 mm	102
Anjō · Japan	31 °C	-0.08 °C	1,493 mm	111

Planning a trip? See the best time to visit Tsu.

QuestionsCommon questions about Tsu’s climate

When is the best time to visit Tsu?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, June, October sit closest to 20 °C on average, August is the warmest month and December the driest. The month-by-month table above has the full picture.

How hot does Tsu get?

In August, the warmest month, daily highs average 30 °C. About 34 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average 2.5 °C in January, the coldest month. A normal year has 5 nights below freezing.

Which month is wettest in Tsu?

September, averaging 260 mm over 16 days with rain. The driest month is December with 68 mm. The year as a whole averages 1,884 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Tsu rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 34.733°, 136.517° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.