Sayō climate — normals and trends
Sayō (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.1 °C and it receives 1,475 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 (26.0 °C on average) and the coldest is January (2.8 °C). Rainfall peaks in July.
Sayō averages 63 frost days, 34 hot days (≥ 30 °C) and 126 rainy days per year.
Sayō has warmed by +2.7 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.
The number of frost days there went from about 87 to 39 per year over the period.
The hottest day of the period reached 39.6 °C (on 4 August 1994) and the coldest -12.2 °C (on 11 December 1981).
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
SayōHyōgo
- coords
- 35.00°, 134.36°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.1°C
Average daily high
18.6°C
Average daily low
9.9°C
Annual rainfall
1,475mm
Sunshine / day
9.0h
Mean relative humidity
74%
Average peak wind
13.9km/h
Seasonal range
23.2°C
Frost days (< 0 °C)
63 d/yr
Hot days (≥ 30 °C)
34 d/yr
Rainy days (≥ 1 mm)
126 d/yr
Annual snowfall
14.1 cm
Average feels-like high
18.2 °C
Average feels-like low
8.9 °C
Average peak gust
36.5 km/h
Tropical nights (≥ 20 °C)
68 d/yr
Solar radiation
15.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.69 · 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
39.6 °C
4 August 1994
Coldest day
-12.2 °C
11 December 1981
Wettest day
236 mm
27 October 1961
Windiest day
58.5 km/h
14 September 1954
Strongest gust
166.0 km/h
14 September 1954
Hottest feels-like
44.3 °C
23 July 2018
Coldest feels-like
-16.2 °C
11 December 1981
Snowiest day
27.1 cm
15 February 1968
Sunniest day
14.0 h
21 May 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 | 7.8 °C | +0.7 °C | 14 mm | -27 mm |
| Feb | 6.2 °C | -1.7 °C | 31 mm | -28 mm |
| Mar | 12.8 °C | +0.9 °C | 123 mm | +22 mm |
| Apr | 18.9 °C | +1.2 °C | 64 mm | -68 mm |
| May | 22.1 °C | +0.2 °C | 172 mm | +27 mm |
| Jun | 27.5 °C | +2.3 °C | 206 mm | -1 mm |
| Jul | 32.0 °C | +3.0 °C | 103 mm | -125 mm |
| Aug | 32.2 °C | +2.0 °C | 176 mm | +23 mm |
| Sep | 28.8 °C | +2.4 °C | 163 mm | -29 mm |
| Oct | 22.7 °C | +1.7 °C | 188 mm | +75 mm |
| Nov | 16.0 °C | +0.7 °C | 26 mm | -41 mm |
| Dec | 10.4 °C | +0.7 °C | 31 mm | -9 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 Sayō?
Sayō has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.1 °C and it receives 1,475 mm of precipitation per year.
What is the hottest day ever recorded in Sayō?
The hottest day measured in Sayō between 1940 and 2025 was 4 August 1994, reaching 39.6 °C.
What is the coldest day in Sayō?
The coldest day measured in Sayō between 1940 and 2025 was 11 December 1981, at -12.2 °C.
Does it snow in Sayō?
Yes. Sayō gets on average 14.1 cm of snow per year and has around 63 frost days.
Has the climate of Sayō warmed?
Yes: Sayō warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sayō?
The wettest day measured in Sayō between 1940 and 2025 was 27 October 1961, with 236 mm of rain in 24 hours.
What was the windiest day in Sayō?
The windiest day measured in Sayō between 1940 and 2025 was 14 September 1954, with winds reaching 58.5 km/h.
What is the warmest month in Sayō?
The warmest month in Sayō is August (26.0 °C on average); the coldest is January (2.8 °C).
How much does it rain in Sayō?
Sayō receives on average 1,475 mm of precipitation per year, spread over about 126 rainy days.
Is it sunny in Sayō?
Sayō gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sayō?
The heaviest 24-hour snowfall measured in Sayō between 1940 and 2025 was 15 February 1968, with 27.1 cm.
Are there tropical nights in Sayō?
Yes: Sayō has on average 68 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sayō?
In Sayō, between 1940 and 2025, the highest apparent temperature reached 44.3 °C on 23 July 2018, and the lowest was -16.2 °C on 11 December 1981.
Compare Sayō with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sayō