Osaka climate — normals and trends
Osaka (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.8 °C and it receives 1,457 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 (27.8 °C on average) and the coldest is January (4.6 °C). Rainfall peaks in June.
Osaka averages 25 frost days, 52 hot days (≥ 30 °C) and 127 rainy days per year.
Osaka has warmed by +3.0 °C between 1940 and 2025, or +0.35 °C per decade. This trend is statistically significant.
The number of frost days there went from about 48 to 2 per year over the period.
The hottest day of the period reached 39.2 °C (on 8 August 1994) and the coldest -7.6 °C (on 12 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
OsakaOsaka
- coords
- 34.69°, 135.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.8°C
Average daily high
19.8°C
Average daily low
12.0°C
Annual rainfall
1,457mm
Sunshine / day
8.8h
Mean relative humidity
72%
Average peak wind
14.2km/h
Seasonal range
23.2°C
Frost days (< 0 °C)
25 d/yr
Hot days (≥ 30 °C)
52 d/yr
Rainy days (≥ 1 mm)
127 d/yr
Annual snowfall
5.3 cm
Average feels-like high
19.6 °C
Average feels-like low
11.4 °C
Average peak gust
33.7 km/h
Tropical nights (≥ 20 °C)
90 d/yr
Solar radiation
14.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.0 °C
since 1940
+0.4 °C per decade · r² = 0.73 · 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
39.2 °C
8 August 1994
Coldest day
-7.6 °C
12 February 1977
Wettest day
178 mm
9 July 1980
Windiest day
63.6 km/h
4 September 2018
Strongest gust
175.0 km/h
26 September 1959
Hottest feels-like
45.3 °C
8 August 1994
Coldest feels-like
-11.8 °C
12 February 1977
Snowiest day
22.7 cm
15 February 1968
Sunniest day
14.0 h
10 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 | 9.4 °C | +1.0 °C | 27 mm | -23 mm |
| Feb | 8.3 °C | -0.8 °C | 30 mm | -34 mm |
| Mar | 14.3 °C | +1.5 °C | 96 mm | -4 mm |
| Apr | 20.5 °C | +1.9 °C | 64 mm | -62 mm |
| May | 23.5 °C | +0.4 °C | 219 mm | +72 mm |
| Jun | 28.5 °C | +2.2 °C | 201 mm | -11 mm |
| Jul | 34.8 °C | +4.7 °C | 56 mm | -143 mm |
| Aug | 34.0 °C | +2.2 °C | 197 mm | +73 mm |
| Sep | 31.1 °C | +3.2 °C | 147 mm | -26 mm |
| Oct | 23.6 °C | +1.6 °C | 211 mm | +82 mm |
| Nov | 16.8 °C | +0.3 °C | 35 mm | -46 mm |
| Dec | 12.8 °C | +1.8 °C | 46 mm | -6 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 Osaka?
Osaka has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.8 °C and it receives 1,457 mm of precipitation per year.
What is the hottest day ever recorded in Osaka?
The hottest day measured in Osaka between 1940 and 2025 was 8 August 1994, reaching 39.2 °C.
What is the coldest day in Osaka?
The coldest day measured in Osaka between 1940 and 2025 was 12 February 1977, at -7.6 °C.
Does it snow in Osaka?
Yes. Osaka gets on average 5.3 cm of snow per year and has around 25 frost days.
Has the climate of Osaka warmed?
Yes: Osaka warmed by +3.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Osaka?
The wettest day measured in Osaka between 1940 and 2025 was 9 July 1980, with 178 mm of rain in 24 hours.
What was the windiest day in Osaka?
The windiest day measured in Osaka between 1940 and 2025 was 4 September 2018, with winds reaching 63.6 km/h.
What is the warmest month in Osaka?
The warmest month in Osaka is August (27.8 °C on average); the coldest is January (4.6 °C).
How much does it rain in Osaka?
Osaka receives on average 1,457 mm of precipitation per year, spread over about 127 rainy days.
Is it sunny in Osaka?
Osaka gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Osaka?
The heaviest 24-hour snowfall measured in Osaka between 1940 and 2025 was 15 February 1968, with 22.7 cm.
Are there tropical nights in Osaka?
Yes: Osaka has on average 90 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Osaka?
In Osaka, between 1940 and 2025, the highest apparent temperature reached 45.3 °C on 8 August 1994, and the lowest was -11.8 °C on 12 February 1977.
Compare Osaka with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Osaka