Tsu climate — normals and trends
Tsu (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.0 °C and it receives 1,911 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (26.3 °C on average) and the coldest is January (4.5 °C). Rainfall peaks in September.
Tsu averages 14 frost days, 26 hot days (≥ 30 °C) and 147 rainy days per year.
Tsu has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 30 to 0 per year over the period.
The hottest day of the period reached 36.1 °C (on 5 August 1994) and the coldest -7.4 °C (on 23 February 1947).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
TsuMie
- coords
- 34.73°, 136.52°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.0°C
Average daily high
18.4°C
Average daily low
11.9°C
Annual rainfall
1,911mm
Sunshine / day
8.9h
Mean relative humidity
75%
Average peak wind
18.7km/h
Seasonal range
21.8°C
Frost days (< 0 °C)
14 d/yr
Hot days (≥ 30 °C)
26 d/yr
Rainy days (≥ 1 mm)
147 d/yr
Annual snowfall
8.9 cm
Average feels-like high
17.9 °C
Average feels-like low
10.8 °C
Average peak gust
38.4 km/h
Tropical nights (≥ 20 °C)
85 d/yr
Solar radiation
15.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.66 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
36.1 °C
5 August 1994
Coldest day
-7.4 °C
23 February 1947
Wettest day
214 mm
12 September 1982
Windiest day
95.4 km/h
26 September 1959
Strongest gust
220.0 km/h
26 September 1959
Hottest feels-like
42.4 °C
16 August 2007
Coldest feels-like
-12.3 °C
26 February 1981
Snowiest day
27.9 cm
15 February 1968
Sunniest day
14.0 h
3 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 8.6 °C | +0.9 °C | 34 mm | -25 mm |
| Feb | 7.5 °C | -0.8 °C | 26 mm | -47 mm |
| Mar | 12.9 °C | +1.0 °C | 99 mm | -20 mm |
| Apr | 18.6 °C | +1.6 °C | 134 mm | -16 mm |
| May | 21.7 °C | +0.5 °C | 261 mm | +81 mm |
| Jun | 26.8 °C | +2.3 °C | 213 mm | -44 mm |
| Jul | 30.9 °C | +2.5 °C | 92 mm | -158 mm |
| Aug | 32.9 °C | +3.3 °C | 118 mm | -80 mm |
| Sep | 29.2 °C | +3.1 °C | 208 mm | -53 mm |
| Oct | 22.0 °C | +1.3 °C | 280 mm | +78 mm |
| Nov | 16.1 °C | +0.5 °C | 41 mm | -63 mm |
| Dec | 11.5 °C | +1.2 °C | 93 mm | +33 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Tsu?
Tsu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.0 °C and it receives 1,911 mm of precipitation per year.
What is the hottest day ever recorded in Tsu?
The hottest day measured in Tsu between 1940 and 2025 was 5 August 1994, reaching 36.1 °C.
What is the coldest day in Tsu?
The coldest day measured in Tsu between 1940 and 2025 was 23 February 1947, at -7.4 °C.
Does it snow in Tsu?
Yes. Tsu gets on average 8.9 cm of snow per year and has around 14 frost days.
Has the climate of Tsu warmed?
Yes: Tsu warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Tsu?
The wettest day measured in Tsu between 1940 and 2025 was 12 September 1982, with 214 mm of rain in 24 hours.
What was the windiest day in Tsu?
The windiest day measured in Tsu between 1940 and 2025 was 26 September 1959, with winds reaching 95.4 km/h.
What is the warmest month in Tsu?
The warmest month in Tsu is August (26.3 °C on average); the coldest is January (4.5 °C).
How much does it rain in Tsu?
Tsu receives on average 1,911 mm of precipitation per year, spread over about 147 rainy days.
Is it sunny in Tsu?
Tsu gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Tsu?
The heaviest 24-hour snowfall measured in Tsu between 1940 and 2025 was 15 February 1968, with 27.9 cm.
Are there tropical nights in Tsu?
Yes: Tsu has on average 85 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Tsu?
In Tsu, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 16 August 2007, and the lowest was -12.3 °C on 26 February 1981.
Compare Tsu with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Tsu