Climate averages 1991–2020

Kasama, Japan weather
in April.

A mild, wet month: the 7th warmest and the 6th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 16.2°C Daytime mean, April

Average low 6.6°C Night-time mean, April

Rainfall 117 mm 12 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

April is a mild month in Kasama, Japan: daytime highs average 16.2°C and nights cool to about 6.6°C. By daytime temperature it is the 7th warmest of the 12 months.

Expect about 117 mm of rain on roughly 12 days, which makes April a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 06 min on an average April day.

The nearest other city in this atlas is Mito (17 km away). In April its highs average 16.6°C, about as warm as Kasama, Japan, with 124 mm of rain.

Among the 303 cities listed in Japan, Kasama, Japan ranks joint 222nd of 303 for the warmest April highs and joint 119th of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Kasama, Japan is 0.6°C cooler than that mean.

From April to May, average highs rise by 4.4°C to 20.6°C, and monthly rainfall rises from 117 mm to 142 mm.

The annual picture

April in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Kasama, Japan climate table

1991–2020

Monthly climate averages for Kasama, Japan, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	6.6°C-1.6°C	-1.6°C	56	6.7	10.010 h
February	7.6°C-1.1°C	-1.1°C	58	7.4	10.811 h
March	11.1°C1.8°C	1.8°C	107	12.1	11.912 h
April, selected	16.2°C6.6°C	6.6°C	117	12.1	13.113 h
May	20.6°C11.8°C	11.8°C	142	12.6	14.114 h
June	23.3°C16.1°C	16.1°C	152	15.3	14.615 h
July	26.9°C20.3°C	20.3°C	184	17.2	14.414 h
August	28.2°C21.7°C	21.7°C	136	15.0	13.514 h
September	24.6°C18.5°C	18.5°C	174	14.8	12.412 h
October	19.4°C12.8°C	12.8°C	179	12.4	11.311 h
November	14.2°C6.6°C	6.6°C	88	8.5	10.310 h
December	9.0°C1.0°C	1.0°C	56	7.3	9.710 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

April in nearby cities

Distance from Kasama

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Kasama) is explained once on the Kasama, Japan year overview and on the Sources, method and limits page.