Yokosuka climate — normals and trends
Yokosuka (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.2 °C and it receives 1,550 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 (25.8 °C on average) and the coldest is January (7.4 °C). Rainfall peaks in October.
Yokosuka averages 0 frost days, 0 hot days (≥ 30 °C) and 137 rainy days per year.
Yokosuka has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 31.8 °C (on 16 August 2020) and the coldest -0.6 °C (on 22 January 1997).
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
YokosukaKanagawa
- coords
- 35.28°, 139.67°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.2°C
Average daily high
17.9°C
Average daily low
14.7°C
Annual rainfall
1,550mm
Sunshine / day
8.3h
Mean relative humidity
75%
Average peak wind
28.6km/h
Seasonal range
18.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
137 d/yr
Annual snowfall
6.1 cm
Average feels-like high
17.4 °C
Average feels-like low
12.3 °C
Average peak gust
43.7 km/h
Tropical nights (≥ 20 °C)
104 d/yr
Solar radiation
13.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.47 · 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
16 August 2020
Coldest day
-0.6 °C
22 January 1997
Wettest day
195 mm
22 September 1996
Windiest day
94.7 km/h
1 October 2018
Strongest gust
168.8 km/h
1 October 2018
Hottest feels-like
39.4 °C
16 August 2020
Coldest feels-like
-9.9 °C
15 February 1951
Snowiest day
28.2 cm
8 February 2014
Sunniest day
13.9 h
8 July 2025
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 | 10.7 °C | +1.1 °C | 48 mm | -18 mm |
| Feb | 10.3 °C | +0.7 °C | 21 mm | -62 mm |
| Mar | 13.3 °C | +1.1 °C | 171 mm | +39 mm |
| Apr | 16.6 °C | +0.7 °C | 129 mm | +1 mm |
| May | 19.8 °C | +0.6 °C | 204 mm | +59 mm |
| Jun | 24.2 °C | +2.2 °C | 114 mm | -66 mm |
| Jul | 27.6 °C | +2.5 °C | 47 mm | -87 mm |
| Aug | 28.5 °C | +1.6 °C | 40 mm | -78 mm |
| Sep | 26.9 °C | +2.0 °C | 96 mm | -81 mm |
| Oct | 21.3 °C | +0.7 °C | 199 mm | -5 mm |
| Nov | 16.6 °C | +0.1 °C | 49 mm | -68 mm |
| Dec | 13.5 °C | +1.3 °C | 84 mm | +18 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 Yokosuka?
Yokosuka has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.2 °C and it receives 1,550 mm of precipitation per year.
What is the hottest day ever recorded in Yokosuka?
The hottest day measured in Yokosuka between 1940 and 2025 was 16 August 2020, reaching 31.8 °C.
What is the coldest day in Yokosuka?
The coldest day measured in Yokosuka between 1940 and 2025 was 22 January 1997, at -0.6 °C.
Does it snow in Yokosuka?
Yes. Yokosuka gets on average 6.1 cm of snow per year and has around 0 frost days.
Has the climate of Yokosuka warmed?
Yes: Yokosuka warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Yokosuka?
The wettest day measured in Yokosuka between 1940 and 2025 was 22 September 1996, with 195 mm of rain in 24 hours.
What was the windiest day in Yokosuka?
The windiest day measured in Yokosuka between 1940 and 2025 was 1 October 2018, with winds reaching 94.7 km/h.
What is the warmest month in Yokosuka?
The warmest month in Yokosuka is August (25.8 °C on average); the coldest is January (7.4 °C).
How much does it rain in Yokosuka?
Yokosuka receives on average 1,550 mm of precipitation per year, spread over about 137 rainy days.
Is it sunny in Yokosuka?
Yokosuka gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Yokosuka?
The heaviest 24-hour snowfall measured in Yokosuka between 1940 and 2025 was 8 February 2014, with 28.2 cm.
Are there tropical nights in Yokosuka?
Yes: Yokosuka has on average 104 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Yokosuka?
In Yokosuka, between 1940 and 2025, the highest apparent temperature reached 39.4 °C on 16 August 2020, and the lowest was -9.9 °C on 15 February 1951.
Compare Yokosuka with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Yokosuka