Ōmura climate — normals and trends
Ōmura (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.7 °C and it receives 1,860 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 (27.2 °C on average) and the coldest is January (6.7 °C). Rainfall peaks in June.
Ōmura averages 1 frost days, 18 hot days (≥ 30 °C) and 138 rainy days per year.
Ōmura has warmed by +2.0 °C between 1940 and 2025, or +0.23 °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 34.5 °C (on 6 August 2024) and the coldest -3.2 °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
ŌmuraNagasaki
- coords
- 32.92°, 129.95°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.7°C
Average daily high
18.8°C
Average daily low
14.8°C
Annual rainfall
1,860mm
Sunshine / day
8.2h
Mean relative humidity
75%
Average peak wind
17.3km/h
Seasonal range
20.5°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
18 d/yr
Rainy days (≥ 1 mm)
138 d/yr
Annual snowfall
3.5 cm
Average feels-like high
19.1 °C
Average feels-like low
14.1 °C
Average peak gust
36.0 km/h
Tropical nights (≥ 20 °C)
110 d/yr
Solar radiation
14.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.68 · 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
34.5 °C
6 August 2024
Coldest day
-3.2 °C
16 February 1977
Wettest day
213 mm
2 June 1988
Windiest day
74.5 km/h
10 September 1956
Strongest gust
185.8 km/h
31 August 1987
Hottest feels-like
41.9 °C
17 July 1994
Coldest feels-like
-10.6 °C
16 February 1977
Snowiest day
16.3 cm
15 February 1968
Sunniest day
13.7 h
19 June 1958
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 | 9.1 °C | +0.4 °C | 23 mm | -38 mm |
| Feb | 7.4 °C | -2.0 °C | 56 mm | -27 mm |
| Mar | 13.1 °C | +0.5 °C | 174 mm | +53 mm |
| Apr | 17.9 °C | +0.7 °C | 98 mm | -60 mm |
| May | 21.2 °C | 0.0 °C | 358 mm | +173 mm |
| Jun | 25.4 °C | +1.3 °C | 472 mm | +124 mm |
| Jul | 31.1 °C | +3.4 °C | 100 mm | -189 mm |
| Aug | 30.4 °C | +1.2 °C | 283 mm | +104 mm |
| Sep | 29.1 °C | +2.7 °C | 184 mm | +0 mm |
| Oct | 24.7 °C | +3.1 °C | 64 mm | -39 mm |
| Nov | 17.4 °C | +0.8 °C | 43 mm | -42 mm |
| Dec | 12.9 °C | +1.6 °C | 61 mm | -3 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 Ōmura?
Ōmura has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.7 °C and it receives 1,860 mm of precipitation per year.
What is the hottest day ever recorded in Ōmura?
The hottest day measured in Ōmura between 1940 and 2025 was 6 August 2024, reaching 34.5 °C.
What is the coldest day in Ōmura?
The coldest day measured in Ōmura between 1940 and 2025 was 16 February 1977, at -3.2 °C.
Does it snow in Ōmura?
Yes. Ōmura gets on average 3.5 cm of snow per year and has around 1 frost days.
Has the climate of Ōmura warmed?
Yes: Ōmura warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ōmura?
The wettest day measured in Ōmura between 1940 and 2025 was 2 June 1988, with 213 mm of rain in 24 hours.
What was the windiest day in Ōmura?
The windiest day measured in Ōmura between 1940 and 2025 was 10 September 1956, with winds reaching 74.5 km/h.
What is the warmest month in Ōmura?
The warmest month in Ōmura is August (27.2 °C on average); the coldest is January (6.7 °C).
How much does it rain in Ōmura?
Ōmura receives on average 1,860 mm of precipitation per year, spread over about 138 rainy days.
Is it sunny in Ōmura?
Ōmura gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ōmura?
The heaviest 24-hour snowfall measured in Ōmura between 1940 and 2025 was 15 February 1968, with 16.3 cm.
Are there tropical nights in Ōmura?
Yes: Ōmura has on average 110 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ōmura?
In Ōmura, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 17 July 1994, and the lowest was -10.6 °C on 16 February 1977.
Compare Ōmura with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ōmura