Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average sea temperature in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
The average high-temperature mildly increases in April, edging from a fresh 12.3°C (54.1°F) in March to a refreshing 16.3°C (61.3°F). April nights are marked by an average low-temperature of 10.7°C (51.3°F).Humidity
In Kosai, Japan, the average relative humidity in April is 71%.Rainfall
In Kosai, Japan, during April, the rain falls for 13.3 days and regularly aggregates up to 85mm (3.35") of precipitation. Throughout the year, in Kosai, there are 163.7 rainfall days, and 1017mm (40.04") of precipitation is accumulated.Snowfall
March through November are months without snowfall.Sea temperature
In April, the average sea temperature in Kosai is 16.8°C (62.2°F).Note: Swimming in 16.8°C (62.2°F) is not a pleasurable activity for the majority of people. Breathing becomes increasingly challenging as water temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
In Kosai, Japan, the average length of the day in April is 13h and 4min.On the first day of April, sunrise is at 05:36 and sunset at 18:10. On the last day of the month, sunrise is at 05:00 and sunset at 18:33 JST.
Sunshine
In Kosai, the average sunshine in April is 9h.UV index
In April, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 4 in April translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are April temperatures?
What is the average humidity in April?
How many days does it rain in April?
When it does not snow?
How cold is the water in April?
What is the average length of the day in April?
When are sunrise and sunset in April?
How long on average sun shines in April in Kosai?
What is the UV index reading in April?
Average temperature in April
Kosai, Japan
- Average high temperature in April: 16.3°C
The warmest month (with the highest average high temperature) is August (29.1°C).
The month with the lowest average high temperature is January (8.4°C).
- Average low temperature in April: 10.7°C
The month with the highest average low temperature is August (24.8°C).
The coldest month (with the lowest average low temperature) is January (3.5°C).
Average pressure in April
Kosai, Japan
- Average pressure in April: 1014.6mbar
The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed in April
Kosai, Japan
- Average wind speed in April: 18.7km/h
The windiest month (with the highest average wind speed) is January (24.2km/h).
The calmest months (with the lowest average wind speed) are July and August (12.8km/h).
Average humidity in April
Kosai, Japan
- Average humidity in April: 71%
The month with the highest relative humidity is July (83%).
The months with the lowest relative humidity are January and February (67%).
Average rainfall in April
Kosai, Japan
- Average rainfall in April: 85mm
The wettest month (with the highest rainfall) is July (190mm).
The driest month (with the least rainfall) is January (27mm).
Average rainfall days in April
Kosai, Japan
- Average rainfall days in April: 13.3 days
The month with the highest number of rainy days is July (20.6 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in April
Kosai, Japan
- Average snowfall in April: 0mm
The month with the highest snowfall is February (2mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in April
Kosai, Japan
- Average snowfall days in April: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in April
Kosai, Japan
- Average sea temperature in April: 16.8°C
The best month for swimming (with the highest average sea temperature) is August (26.8°C).
The coldest month (with the lowest average sea temperature) is March (15.1°C).
Average daylight in April /
Average sunshine in April
Kosai, Japan
- Average daylight in April: 13h and 1min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in April: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in April
Kosai, Japan
- Average sunshine days in April: 14.8 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is July (8.7 days).
Average UV index in April
Kosai, Japan
- Average UV index in April: 4
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in April
Kosai, Japan
- Average cloud cover in April: 38
The month with the most cloud cover is June (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 28).
Average visibility in April
Kosai, Japan
- Average visibility in April: 10km
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).
Kosai, Japan
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