Shimonoseki climate — normals and trends
Shimonoseki (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.3 °C and it receives 1,776 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 (26.8 °C on average) and the coldest is January (6.8 °C). Rainfall peaks in June.
Shimonoseki averages 1 frost days, 4 hot days (≥ 30 °C) and 149 rainy days per year.
Shimonoseki has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 2 to 0 per year over the period.
The hottest day of the period reached 31.8 °C (on 6 August 2025) and the coldest -3.8 °C (on 26 February 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
ShimonosekiYamaguchi
- coords
- 33.96°, 130.94°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.3°C
Average daily high
17.8°C
Average daily low
14.9°C
Annual rainfall
1,776mm
Sunshine / day
8.4h
Mean relative humidity
75%
Average peak wind
22.7km/h
Seasonal range
20.0°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
149 d/yr
Annual snowfall
13.3 cm
Average feels-like high
17.6 °C
Average feels-like low
13.3 °C
Average peak gust
36.3 km/h
Tropical nights (≥ 20 °C)
110 d/yr
Solar radiation
14.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.45 · 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
31.8 °C
6 August 2025
Coldest day
-3.8 °C
26 February 1981
Wettest day
171 mm
17 September 1945
Windiest day
77.3 km/h
27 September 1991
Strongest gust
146.5 km/h
7 September 2004
Hottest feels-like
39.9 °C
2 August 2024
Coldest feels-like
-14.5 °C
26 February 1981
Snowiest day
11.9 cm
15 February 1968
Sunniest day
13.9 h
12 June 1950
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 | 8.8 °C | +0.5 °C | 39 mm | -52 mm |
| Feb | 7.1 °C | -1.6 °C | 83 mm | -19 mm |
| Mar | 12.1 °C | +0.6 °C | 195 mm | +61 mm |
| Apr | 16.0 °C | +0.4 °C | 90 mm | -72 mm |
| May | 19.2 °C | -0.2 °C | 264 mm | +85 mm |
| Jun | 24.0 °C | +1.3 °C | 331 mm | +58 mm |
| Jul | 28.8 °C | +2.1 °C | 79 mm | -164 mm |
| Aug | 29.9 °C | +1.7 °C | 231 mm | +95 mm |
| Sep | 28.1 °C | +2.7 °C | 202 mm | +24 mm |
| Oct | 23.2 °C | +2.5 °C | 89 mm | -14 mm |
| Nov | 17.0 °C | +1.0 °C | 33 mm | -59 mm |
| Dec | 12.6 °C | +1.6 °C | 76 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 Shimonoseki?
Shimonoseki has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.3 °C and it receives 1,776 mm of precipitation per year.
What is the hottest day ever recorded in Shimonoseki?
The hottest day measured in Shimonoseki between 1940 and 2025 was 6 August 2025, reaching 31.8 °C.
What is the coldest day in Shimonoseki?
The coldest day measured in Shimonoseki between 1940 and 2025 was 26 February 1981, at -3.8 °C.
Does it snow in Shimonoseki?
Yes. Shimonoseki gets on average 13.3 cm of snow per year and has around 1 frost days.
Has the climate of Shimonoseki warmed?
Yes: Shimonoseki warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Shimonoseki?
The wettest day measured in Shimonoseki between 1940 and 2025 was 17 September 1945, with 171 mm of rain in 24 hours.
What was the windiest day in Shimonoseki?
The windiest day measured in Shimonoseki between 1940 and 2025 was 27 September 1991, with winds reaching 77.3 km/h.
What is the warmest month in Shimonoseki?
The warmest month in Shimonoseki is August (26.8 °C on average); the coldest is January (6.8 °C).
How much does it rain in Shimonoseki?
Shimonoseki receives on average 1,776 mm of precipitation per year, spread over about 149 rainy days.
Is it sunny in Shimonoseki?
Shimonoseki gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Shimonoseki?
The heaviest 24-hour snowfall measured in Shimonoseki between 1940 and 2025 was 15 February 1968, with 11.9 cm.
Are there tropical nights in Shimonoseki?
Yes: Shimonoseki has on average 110 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Shimonoseki?
In Shimonoseki, between 1940 and 2025, the highest apparent temperature reached 39.9 °C on 2 August 2024, and the lowest was -14.5 °C on 26 February 1981.
Compare Shimonoseki with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Shimonoseki