Expand
Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, the same as December, is another fresh winter month in Isumi, Japan, with temperature in the range of an average low of 7°C (44.6°F) and an average high of 10.6°C (51.1°F). Isumi reaches its lowest average temperatures in January, measuring 10.6°C (51.1°F) at the peak and 7°C (44.6°F) at the lowest. Weather in January »
Weather in February
The last month of the winter, February, is another cool month in Isumi, Japan, with an average temperature ranging between min 7.3°C (45.1°F) and max 11.1°C (52°F). Entering February, the average high-temperature is recorded at a still cool 11.1°C (52°F), exhibiting a minimal shift from January's 10.6°C (51.1°F). Weather in February »
Weather in March
The first month of the spring, March, is a moderate month in Isumi, Japan, with an average temperature ranging between min 9.6°C (49.3°F) and max 13.6°C (56.5°F). The initiation of March records an average high-temperature of a refreshing 13.6°C (56.5°F), displaying a near consistency with the previous month. Weather in March »
Weather in April
April is a refreshing spring month in Isumi, Japan, with temperature in the range of an average high of 16.8°C (62.2°F) and an average low of 13.3°C (55.9°F). The onset of April introduces a subtle rise in the average high-temperature, nudging from 13.6°C (56.5°F) in March to a still refreshing 16.8°C (62.2°F). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Isumi, Japan, with an average temperature fluctuating between 17.4°C (63.3°F) and 20.4°C (68.7°F). May's arrival coincides with a subtle temperature rise, moving from April's comfortable 16.8°C (62.2°F) to a pleasant 20.4°C (68.7°F). Weather in May »
Weather in June
June, the first month of the summer in Isumi, is also an agreeable month, with an average temperature varying between 20.3°C (68.5°F) and 22.7°C (72.9°F). The average high-temperature during June registers at a still agreeable 22.7°C (72.9°F), maintaining a close resemblance to the previous month. Weather in June »
Weather in July
July in Isumi, Japan, is a moderately hot summer month, with an average temperature varying between 26.4°C (79.5°F) and 23.7°C (74.7°F). The average high-temperature mildly increases in July, edging from a pleasant 22.7°C (72.9°F) in June to a warm 26.4°C (79.5°F). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Isumi, Japan, with an average temperature varying between 28.3°C (82.9°F) and 25.6°C (78.1°F). Isumi's temperatures tend to reach their peak averages in August, with a high of 28.3°C (82.9°F) and a low of 25.6°C (78.1°F). In August, the heat index is computed to be a tropical 33°C (91.4°F). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Isumi, Japan, with an average temperature fluctuating between 25.8°C (78.4°F) and 23.5°C (74.3°F). September's climate shows a minor adjustment in average high-temperatures to a still warm 25.8°C (78.4°F) from August's 28.3°C (82.9°F). Weather in September »
Weather in October
October, like September, is another pleasant autumn month in Isumi, Japan, with temperature in the range of an average high of 22°C (71.6°F) and an average low of 19.2°C (66.6°F). October brings a slight decrease in temperature, down from a moderately hot 25.8°C (78.4°F) in September to a pleasant 22°C (71.6°F). Weather in October »
Weather in November
November, the last month of the autumn in Isumi, is also an enjoyable month, with an average temperature ranging between min 14.6°C (58.3°F) and max 17.6°C (63.7°F). With the arrival of November, Isumi notices a mild change in the average high-temperature, sliding from October's agreeable 22°C (71.6°F) to an enjoyable 17.6°C (63.7°F). Weather in November »
Weather in December
The first month of the winter, December, is also a moderate month in Isumi, Japan, with temperature in the range of an average low of 9.8°C (49.6°F) and an average high of 13.5°C (56.3°F). December's arrival signals a moderate reduction in the average high-temperature, easing from a refreshing 17.6°C (63.7°F) in November to a mild 13.5°C (56.3°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
What month is the coldest in Isumi?
The coldest period is January, when temperatures fluctuate between an average high of 10.6°C (51.1°F) and a low of 7°C (44.6°F).
What is the least humid month in Isumi?
The least humid month in Isumi is January, with an average relative humidity of 63%.
What is the driest month in Isumi?
The month with the least rainfall in Isumi is January, when the rain falls for 9.6 days and typically collects 58mm (2.28") of precipitation.
How much does it rain in Isumi?
In Isumi, Japan, during the entire year, the rain falls for 178.9 days and collects up to 1201mm (47.28") of precipitation.
When does it snow in Isumi?
January and February are months with snowfall in Isumi.
What is the snowiest month in Isumi?
The months with the most snowfall days in Isumi are January and February, with an average of 0.1 snowfall days.
How many days does it snow in Isumi?
In Isumi, during the entire year, snow falls for 0.2 days.
When is the lowest UV index in Isumi?
January and February, with an average maximum UV index of 3, are months with the lowest UV index in Isumi, Japan.
What is the month with the least sunshine in Isumi?
With an average of 4.9h of sunshine, February has the least sunshine of the year in Isumi.
When it does not snow in Isumi?
March through December are months without snowfall.
When are the longest days in Isumi?
The month with the longest days is June, with an average of 14h and 30min of daylight.
When is the highest UV index in Isumi?
The months with the highest UV index in Isumi are June through September, with an average maximum UV index of 6.
What is the most humid month in Isumi?
With an average relative humidity of 86%, July is the most humid month in Isumi.
What is the warmest month in Isumi?
August proves to be the warmest month in Isumi, recording an average peak temperature of 28.3°C (82.9°F) and a minimum temperature of 25.6°C (78.1°F).
What month has the most sunshine in Isumi?
With an average of 10.6h of sunshine, August has the most sunshine of the year.
What is the wettest month in Isumi?
The month with the most rainfall in Isumi, Japan, is October, when the rain falls for 18.5 days and typically aggregates up to 164mm (6.46") of precipitation.
What is the month with the shortest days in Isumi?
December has the shortest days of the year in Isumi, with an average of 9h and 48min of daylight.
Is there Daylight Saving Time (DST) in Isumi?
Isumi, Japan, does not utilize Daylight Saving Time (DST). JST timezone is used throughout the entire year.
Average temperature
Isumi, Japan
The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (10.6°C).
The month with the highest average low temperature is August (25.6°C).
The coldest month (with the lowest average low temperature) is January (7°C).
Average pressure
Isumi, Japan
- Average pressure in January:
1015.5mbar - Average pressure in February:
1016.5mbar - Average pressure in March:
1015.1mbar - Average pressure in April:
1014.1mbar - Average pressure in May:
1012mbar - Average pressure in June:
1009.1mbar
- Average pressure in July:
1009.7mbar - Average pressure in August:
1009.9mbar - Average pressure in September:
1013.1mbar - Average pressure in October:
1016.1mbar - Average pressure in November:
1017.6mbar - Average pressure in December:
1015.7mbar
The month with the highest atmospheric pressure is November (1017.6mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed
Isumi, Japan
- Average wind speed in January:
23.8km/h - Average wind speed in February:
24.7km/h - Average wind speed in March:
25.5km/h - Average wind speed in April:
23.9km/h - Average wind speed in May:
20.6km/h - Average wind speed in June:
18.7km/h
- Average wind speed in July:
20.2km/h - Average wind speed in August:
18.9km/h - Average wind speed in September:
20.2km/h - Average wind speed in October:
22.5km/h - Average wind speed in November:
21.7km/h - Average wind speed in December:
24.1km/h
The windiest month (with the highest average wind speed) is March (25.5km/h).
The calmest month (with the lowest average wind speed) is June (18.7km/h).
Average humidity
Isumi, Japan
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is January (63%).
Average rainfall
Isumi, Japan
- Average rainfall in January:
58mm - Average rainfall in February:
74mm - Average rainfall in March:
111mm - Average rainfall in April:
97mm - Average rainfall in May:
88mm - Average rainfall in June:
131mm
The wettest month (with the highest rainfall) is October (164mm).
The driest month (with the least rainfall) is January (58mm).
Average rainfall days
Isumi, Japan
- Average rainfall days in January:
9.6 days - Average rainfall days in February:
13.3 days - Average rainfall days in March:
17.5 days - Average rainfall days in April:
16.1 days - Average rainfall days in May:
13 days - Average rainfall days in June:
16.4 days
- Average rainfall days in July:
15.4 days - Average rainfall days in August:
14.5 days - Average rainfall days in September:
17.2 days - Average rainfall days in October:
18.5 days - Average rainfall days in November:
15.3 days - Average rainfall days in December:
12.1 days
The month with the highest number of rainy days is October (18.5 days).
The month with the least rainy days is January (9.6 days).
Average snowfall days
Isumi, Japan
- Average snowfall days in January:
0.1 days - Average snowfall days in February:
0.1 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 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:
0 days
The months with the highest number of snowfall days are January and February (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight / Average sunshine
Isumi, Japan
- Average daylight in January:
10h and 1min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 3min
- Average daylight in July:
14h and 2min - Average daylight in August:
13h and 3min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in January:
6h and 0min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 1min - Average sunshine in June:
8h and 2min
- Average sunshine in July:
9h and 2min - Average sunshine in August:
10h and 4min - Average sunshine in September:
7h and 5min - Average sunshine in October:
6h and 3min - Average sunshine in November:
5h and 2min - Average sunshine in December:
5h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days
Isumi, Japan
- Average sunshine days in January:
19.9 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
11.3 days - Average sunshine days in April:
12.1 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
11.2 days
- Average sunshine days in July:
13.9 days - Average sunshine days in August:
14.7 days - Average sunshine days in September:
11 days - Average sunshine days in October:
10.2 days - Average sunshine days in November:
13.6 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is October (10.2 days).
Average UV index
Isumi, Japan
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January and February (UV index 3).
Average cloud cover
Isumi, Japan
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility
Isumi, Japan
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
