Climate averages 1991–2020

Ōmihachiman weather
in April.

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

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

Average high 17.2°C Daytime mean, April

Average low 7.4°C Night-time mean, April

Rainfall 123 mm 12 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

April is a mild month in Ōmihachiman: daytime highs average 17.2°C and nights cool to about 7.4°C. By daytime temperature it is the 7th warmest of the 12 months.

Expect about 123 mm of rain on roughly 12 days, which makes April a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 03 min on an average April day.

The nearest other city in this atlas is Youkaichi (9 km away). In April its highs average 17.3°C, about as warm as Ōmihachiman, with 133 mm of rain.

Among the 303 cities listed in Japan, Ōmihachiman ranks joint 176th of 303 for the warmest April highs and joint 142nd of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Ōmihachiman is 0.5°C warmer than that mean.

From April to May, average highs rise by 4.7°C to 21.9°C, and monthly rainfall rises from 123 mm to 148 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

Ōmihachiman climate table

1991–2020

Monthly climate averages for Ōmihachiman, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	7.1°C0.0°C	0.0°C	81	13.9	10.110 h
February	8.0°C0.0°C	0.0°C	78	13.0	10.911 h
March	11.8°C2.6°C	2.6°C	116	13.5	11.912 h
April, selected	17.2°C7.4°C	7.4°C	123	11.6	13.113 h
May	21.9°C12.6°C	12.6°C	148	11.6	14.014 h
June	25.3°C17.3°C	17.3°C	186	14.0	14.514 h
July	28.9°C21.8°C	21.8°C	210	15.9	14.314 h
August	30.2°C22.8°C	22.8°C	122	12.3	13.513 h
September	26.2°C19.1°C	19.1°C	179	12.3	12.412 h
October	20.5°C13.2°C	13.2°C	152	10.8	11.311 h
November	15.1°C7.5°C	7.5°C	81	9.0	10.410 h
December	9.6°C2.4°C	2.4°C	75	11.6	9.810 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 Ōmihachiman

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 Ōmihachiman) is explained once on the Ōmihachiman year overview and on the Sources, method and limits page.