Hagi climate — normals and trends
Hagi (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.4 °C and it receives 1,711 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 (4.9 °C). Rainfall peaks in July.
Hagi averages 12 frost days, 31 hot days (≥ 30 °C) and 160 rainy days per year.
Hagi 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 23 to 1 per year over the period.
The hottest day of the period reached 35.8 °C (on 6 August 2021) and the coldest -6.5 °C (on 16 February 1977).
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
HagiYamaguchi
- coords
- 34.40°, 131.42°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.4°C
Average daily high
18.7°C
Average daily low
12.3°C
Annual rainfall
1,711mm
Sunshine / day
8.7h
Mean relative humidity
73%
Average peak wind
19.0km/h
Seasonal range
21.9°C
Frost days (< 0 °C)
12 d/yr
Hot days (≥ 30 °C)
31 d/yr
Rainy days (≥ 1 mm)
160 d/yr
Annual snowfall
29.1 cm
Average feels-like high
18.1 °C
Average feels-like low
11.0 °C
Average peak gust
39.9 km/h
Tropical nights (≥ 20 °C)
84 d/yr
Solar radiation
14.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.69 · 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
35.8 °C
6 August 2021
Coldest day
-6.5 °C
16 February 1977
Wettest day
169 mm
10 October 1945
Windiest day
66.3 km/h
7 September 2004
Strongest gust
170.3 km/h
7 September 2004
Hottest feels-like
42.2 °C
20 July 2018
Coldest feels-like
-15.3 °C
26 February 1981
Snowiest day
22.1 cm
15 February 1968
Sunniest day
13.9 h
13 June 2019
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 | 8.2 °C | +0.6 °C | 42 mm | -47 mm |
| Feb | 6.6 °C | -1.9 °C | 69 mm | -22 mm |
| Mar | 13.2 °C | +1.1 °C | 166 mm | +52 mm |
| Apr | 18.2 °C | +0.8 °C | 74 mm | -56 mm |
| May | 21.3 °C | -0.3 °C | 194 mm | +54 mm |
| Jun | 26.4 °C | +1.8 °C | 237 mm | +8 mm |
| Jul | 32.1 °C | +3.6 °C | 81 mm | -183 mm |
| Aug | 31.3 °C | +1.2 °C | 245 mm | +75 mm |
| Sep | 28.7 °C | +2.5 °C | 217 mm | +13 mm |
| Oct | 23.2 °C | +2.0 °C | 102 mm | -3 mm |
| Nov | 16.7 °C | +0.8 °C | 41 mm | -49 mm |
| Dec | 11.8 °C | +1.4 °C | 85 mm | -1 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 Hagi?
Hagi has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.4 °C and it receives 1,711 mm of precipitation per year.
What is the hottest day ever recorded in Hagi?
The hottest day measured in Hagi between 1940 and 2025 was 6 August 2021, reaching 35.8 °C.
What is the coldest day in Hagi?
The coldest day measured in Hagi between 1940 and 2025 was 16 February 1977, at -6.5 °C.
Does it snow in Hagi?
Yes. Hagi gets on average 29.1 cm of snow per year and has around 12 frost days.
Has the climate of Hagi warmed?
Yes: Hagi warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hagi?
The wettest day measured in Hagi between 1940 and 2025 was 10 October 1945, with 169 mm of rain in 24 hours.
What was the windiest day in Hagi?
The windiest day measured in Hagi between 1940 and 2025 was 7 September 2004, with winds reaching 66.3 km/h.
What is the warmest month in Hagi?
The warmest month in Hagi is August (26.8 °C on average); the coldest is January (4.9 °C).
How much does it rain in Hagi?
Hagi receives on average 1,711 mm of precipitation per year, spread over about 160 rainy days.
Is it sunny in Hagi?
Hagi gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hagi?
The heaviest 24-hour snowfall measured in Hagi between 1940 and 2025 was 15 February 1968, with 22.1 cm.
Are there tropical nights in Hagi?
Yes: Hagi has on average 84 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hagi?
In Hagi, between 1940 and 2025, the highest apparent temperature reached 42.2 °C on 20 July 2018, and the lowest was -15.3 °C on 26 February 1981.
Compare Hagi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hagi