Climate and monthly weather forecastKoyasan, Japan
Climate and monthly weather forecast
Weather in January
January, the same as December, in Koyasan, Japan, is another chilly winter month, with an average temperature ranging between max 6.7°C (44.1°F) and min 0.1°C (32.2°F). With average high temperatures of 6.7°C (44.1°F) and lows of 0.1°C (32.2°F), January is the coldest month. Weather in January »Weather in February
The last month of the winter, February, is also a frosty month in Koyasan, Japan, with an average temperature fluctuating between 0.6°C (33.1°F) and 8°C (46.4°F). The average high-temperature is a still chilly 8°C (46.4°F) in February, hardly different from the 6.7°C (44.1°F) recorded in January. Weather in February »Weather in March
The first month of the spring, March, is a fresh month in Koyasan, Japan, with an average temperature fluctuating between 11.6°C (52.9°F) and 2.8°C (37°F). Koyasan's transition into March is marked by a minor temperature shift, moving from a frosty 8°C (46.4°F) in February to a cool 11.6°C (52.9°F). Weather in March »Weather in April
April in Koyasan, Japan, is a refreshing spring month, with temperature in the range of an average low of 7.4°C (45.3°F) and an average high of 16.4°C (61.5°F). The transition from March to April brings a subtle temperature rise, with average high-temperatures increasing from a cool 11.6°C (52.9°F) to an enjoyable 16.4°C (61.5°F). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Koyasan, Japan, with an average temperature varying between 21.7°C (71.1°F) and 12.3°C (54.1°F). Koyasan in May experiences an increase in the average high-temperature, moving from April's comfortable 16.4°C (61.5°F) to a pleasant 21.7°C (71.1°F). Weather in May »Weather in June
June, the first month of the summer in Koyasan, is a warm month, with an average temperature fluctuating between 24.5°C (76.1°F) and 16.7°C (62.1°F). Koyasan experiences a recorded average high-temperature of a moderately hot 24.5°C (76.1°F) in June, closely aligned with May's 21.7°C (71.1°F). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Koyasan, Japan, with an average temperature fluctuating between 28°C (82.4°F) and 21.2°C (70.2°F). Observing a minor shift, the average high-temperature during July adjusts from June's 24.5°C (76.1°F) to a still moderately hot 28°C (82.4°F). Weather in July »Weather in August
August, the last month of the summer in Koyasan, is also a moderately hot month, with an average temperature fluctuating between 29.9°C (85.8°F) and 22.3°C (72.1°F). With an average high-temperature of 29.9°C (85.8°F) and an average low-temperature of 22.3°C (72.1°F), August is the warmest month. August's average heat index is computed to be a sweltering 37°C (98.6°F). Weather in August »Weather in September
September, the first month of the autumn in Koyasan, is also a moderately hot month, with an average temperature varying between 18.5°C (65.3°F) and 26°C (78.8°F). A moderate decline in average high-temperatures is noted in September, moving from 29.9°C (85.8°F) in August to a still moderately hot 26°C (78.8°F). Weather in September »Weather in October
October, the same as September, in Koyasan, Japan, is another pleasant autumn month, with temperature in the range of an average low of 13°C (55.4°F) and an average high of 20.5°C (68.9°F). October implies a gentle temperature shift, with average high-temperatures reducing from September's warm 26°C (78.8°F) to a pleasant 20.5°C (68.9°F). Weather in October »Weather in November
The last month of the autumn, November, is also a moderate month in Koyasan, Japan, with an average temperature fluctuating between 7.5°C (45.5°F) and 14.9°C (58.8°F). Observing a mild shift, the average high-temperature during November reduces from October's pleasant 20.5°C (68.9°F) to a moderate 14.9°C (58.8°F). Weather in November »Weather in December
The first month of the winter, December, is still a chilly month in Koyasan, Japan, with an average temperature varying between 2.5°C (36.5°F) and 8.9°C (48°F). With December's onset, the weather shows a temperature decrease, transitioning from a mild 14.9°C (58.8°F) in November to a frosty 8.9°C (48°F). Weather in December »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Koyasan, Japan, records the coldest temperatures in January, averaging a high of 6.7°C (44.1°F) and a low of 0.1°C (32.2°F).
The month with the least rainfall is January, when the rain falls for 15.3 days and typically collects 56mm (2.2") of precipitation.
Throughout the year, there are 199.5 rainfall days, and 1277mm (50.28") of precipitation is accumulated.
January through April and December are months with snowfall.
January is the month with the most snowfall in Koyasan, Japan. Snow falls for 11.1 days and accumulates 90mm (3.54") of snow.
In Koyasan, during the entire year, snow falls for 25.9 days and aggregates up to 201mm (7.91") of snow.
The months with the least sunshine in Koyasan are January and February, with an average of 5.2h of sunshine.
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
May is the least humid month, with an average relative humidity of 74%.
May through November are months without snowfall.
The month with the longest days is June, with an average of 14h and 24min of daylight.
July is the most humid month, with an average relative humidity of 83%.
July is the month with the most rainfall in Koyasan. Rain falls for 21.1 days and accumulates 179mm (7.05") of precipitation.
The month with the highest UV index in Koyasan is July, with an average maximum UV index of 7.
August is the warmest month in Koyasan, with the temperature often reaching an average high of 29.9°C (85.8°F) and an average low of 22.3°C (72.1°F).
The month with the most sunshine in Koyasan, Japan, is August, with an average of 10.7h of sunshine.
December has the shortest days of the year in Koyasan, with an average of 9h and 54min of daylight.
Koyasan, Japan, does not utilize Daylight Saving Time (DST). JST timezone is used over the entire year.
Average temperature
Koyasan, Japan
The warmest month (with the highest average high temperature) is August (29.9°C).
The month with the lowest average high temperature is January (6.7°C).
The month with the highest average low temperature is August (22.3°C).
The coldest month (with the lowest average low temperature) is January (0.1°C).
Average pressure
Koyasan, Japan
- Average pressure in January:
1019.4mbar - Average pressure in February:
1019.5mbar - Average pressure in March:
1017.3mbar - Average pressure in April:
1015mbar - Average pressure in May:
1012.3mbar - Average pressure in June:
1008.8mbar
- Average pressure in July:
1009.4mbar - Average pressure in August:
1009.6mbar - Average pressure in September:
1012.6mbar - Average pressure in October:
1016.5mbar - Average pressure in November:
1019.4mbar - Average pressure in December:
1019.2mbar
The month with the highest atmospheric pressure is February (1019.5mbar).
The month with the lowest atmospheric pressure is June (1008.8mbar).
Average wind speed
Koyasan, Japan
- Average wind speed in January:
9.5km/h - Average wind speed in February:
8.7km/h - Average wind speed in March:
8.7km/h - Average wind speed in April:
8km/h - Average wind speed in May:
6.8km/h - Average wind speed in June:
6.2km/h
- Average wind speed in July:
6.5km/h - Average wind speed in August:
6.2km/h - Average wind speed in September:
6.3km/h - Average wind speed in October:
7.1km/h - Average wind speed in November:
6.9km/h - Average wind speed in December:
9km/h
The windiest month (with the highest average wind speed) is January (9.5km/h).
The calmest months (with the lowest average wind speed) are June and August (6.2km/h).
Average humidity
Koyasan, Japan
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is May (74%).
Average rainfall
Koyasan, Japan
- Average rainfall in January:
56mm - Average rainfall in February:
67mm - Average rainfall in March:
90mm - Average rainfall in April:
103mm - Average rainfall in May:
123mm - Average rainfall in June:
166mm
The wettest month (with the highest rainfall) is July (179mm).
The driest month (with the least rainfall) is January (56mm).
Average rainfall days
Koyasan, Japan
- Average rainfall days in January:
15.3 days - Average rainfall days in February:
13.8 days - Average rainfall days in March:
16.2 days - Average rainfall days in April:
15.7 days - Average rainfall days in May:
14.4 days - Average rainfall days in June:
20 days
- Average rainfall days in July:
21.1 days - Average rainfall days in August:
19.3 days - Average rainfall days in September:
16.4 days - Average rainfall days in October:
16.4 days - Average rainfall days in November:
14.2 days - Average rainfall days in December:
16.7 days
The month with the highest number of rainy days is July (21.1 days).
The month with the least rainy days is February (13.8 days).
Average snowfall
Koyasan, Japan
The month with the highest snowfall is January (90mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days
Koyasan, Japan
- Average snowfall days in January:
11.1 days - Average snowfall days in February:
7.1 days - Average snowfall days in March:
2.5 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
4.9 days
The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average daylight / Average sunshine
Koyasan, Japan
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
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 January:
5h and 12min - Average sunshine in February:
5h and 12min - Average sunshine in March:
7h and 12min - Average sunshine in April:
8h and 54min - Average sunshine in May:
9h and 30min - Average sunshine in June:
8h and 54min
- Average sunshine in July:
9h and 24min - Average sunshine in August:
10h and 42min - Average sunshine in September:
8h and 48min - Average sunshine in October:
6h and 24min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days
Koyasan, Japan
- Average sunshine days in January:
9.6 days - Average sunshine days in February:
11 days - Average sunshine days in March:
10.8 days - Average sunshine days in April:
12 days - Average sunshine days in May:
14.3 days - Average sunshine days in June:
8 days
- Average sunshine days in July:
7.9 days - Average sunshine days in August:
9.6 days - Average sunshine days in September:
11.3 days - Average sunshine days in October:
11.1 days - Average sunshine days in November:
13.2 days - Average sunshine days in December:
8.8 days
The month with the most sunshine days is May (14.3 days).
The month with the least sunshine days is July (7.9 days).
Average UV index
Koyasan, Japan
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Koyasan, Japan
The month with the most cloud cover is January (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility
Koyasan, Japan
The months with the highest visibility are January, February, March, April, May, August, September, October, November and December (9km).
The months with the lowest visibility are June and July (8km).
