Kamaishi climate — normals and trends
Kamaishi (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.8 °C and it receives 1,407 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 (22.0 °C on average) and the coldest is January (-1.6 °C). Rainfall peaks in September.
Kamaishi averages 98 frost days, 1 hot days (≥ 30 °C) and 145 rainy days per year.
Kamaishi has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 119 to 77 per year over the period.
The hottest day of the period reached 32.6 °C (on 5 August 2015) and the coldest -17.9 °C (on 27 January 1985).
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
KamaishiIwate
- coords
- 39.28°, 141.87°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.8°C
Average daily high
12.9°C
Average daily low
6.7°C
Annual rainfall
1,407mm
Sunshine / day
8.5h
Mean relative humidity
75%
Average peak wind
17.9km/h
Seasonal range
23.6°C
Frost days (< 0 °C)
98 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
89.9 cm
Average feels-like high
11.2 °C
Average feels-like low
4.3 °C
Average peak gust
46.4 km/h
Tropical nights (≥ 20 °C)
28 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.63 · 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
32.6 °C
5 August 2015
Coldest day
-17.9 °C
27 January 1985
Wettest day
213 mm
15 September 1947
Windiest day
59.8 km/h
23 August 1981
Strongest gust
161.3 km/h
23 August 1981
Hottest feels-like
38.3 °C
29 August 2020
Coldest feels-like
-23.3 °C
27 January 1985
Snowiest day
40.0 cm
18 January 2016
Sunniest day
14.8 h
18 June 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 | 4.1 °C | +2.4 °C | 34 mm | -22 mm |
| Feb | 3.6 °C | +1.4 °C | 12 mm | -48 mm |
| Mar | 8.1 °C | +2.4 °C | 94 mm | -3 mm |
| Apr | 12.6 °C | +1.2 °C | 125 mm | +16 mm |
| May | 16.7 °C | +0.9 °C | 163 mm | +46 mm |
| Jun | 23.1 °C | +4.2 °C | 79 mm | -54 mm |
| Jul | 27.4 °C | +4.7 °C | 117 mm | -47 mm |
| Aug | 27.6 °C | +3.0 °C | 140 mm | -34 mm |
| Sep | 24.1 °C | +2.8 °C | 221 mm | +16 mm |
| Oct | 16.6 °C | +0.5 °C | 143 mm | -1 mm |
| Nov | 11.0 °C | +0.7 °C | 83 mm | +0 mm |
| Dec | 6.1 °C | +1.5 °C | 75 mm | +10 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 Kamaishi?
Kamaishi has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.8 °C and it receives 1,407 mm of precipitation per year.
What is the hottest day ever recorded in Kamaishi?
The hottest day measured in Kamaishi between 1940 and 2025 was 5 August 2015, reaching 32.6 °C.
What is the coldest day in Kamaishi?
The coldest day measured in Kamaishi between 1940 and 2025 was 27 January 1985, at -17.9 °C.
Does it snow in Kamaishi?
Yes. Kamaishi gets on average 89.9 cm of snow per year and has around 98 frost days.
Has the climate of Kamaishi warmed?
Yes: Kamaishi warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kamaishi?
The wettest day measured in Kamaishi between 1940 and 2025 was 15 September 1947, with 213 mm of rain in 24 hours.
What was the windiest day in Kamaishi?
The windiest day measured in Kamaishi between 1940 and 2025 was 23 August 1981, with winds reaching 59.8 km/h.
What is the warmest month in Kamaishi?
The warmest month in Kamaishi is August (22.0 °C on average); the coldest is January (-1.6 °C).
How much does it rain in Kamaishi?
Kamaishi receives on average 1,407 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Kamaishi?
Kamaishi gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kamaishi?
The heaviest 24-hour snowfall measured in Kamaishi between 1940 and 2025 was 18 January 2016, with 40.0 cm.
Are there tropical nights in Kamaishi?
Yes: Kamaishi has on average 28 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kamaishi?
In Kamaishi, between 1940 and 2025, the highest apparent temperature reached 38.3 °C on 29 August 2020, and the lowest was -23.3 °C on 27 January 1985.
Compare Kamaishi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kamaishi