Climate Insights for Isen

Ōshima-gun, Kagoshima-ken, Japan

Hottest
August
29°C peak
Coldest
February
16°C low
Wettest
June
416mm rain
Best to Visit
Varies throughout year

Climate Overview

The climate in Isen is warm and mild. The average annual temperature is 23°C and approximately 2141mm of precipitation falls per year. Isen receives a notable amount of rainfall throughout the year, including during its driest month. Isen is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, March, when temperatures can drop to 16°C.

Temperature

10° 15° 20° 25° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 19° Average: 18° Min: 17° Feb Max: 19° Average: 17° Min: 16° Mar Max: 20° Average: 19° Min: 18° Apr Max: 21° Average: 21° Min: 20° May Max: 24° Average: 23° Min: 23° Jun Max: 27° Average: 26° Min: 25° Jul Max: 29° Average: 28° Min: 27° Aug Max: 29° Average: 29° Min: 28° Sep Max: 28° Average: 28° Min: 27° Oct Max: 26° Average: 26° Min: 25° Nov Max: 24° Average: 23° Min: 22° Dec Max: 20° Average: 19° Min: 18°
Max
Average
Min

Isen sees moderate temperature variation throughout the year, ranging from 16°C to 29°C. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 29°C. February is the coolest month, with minimum temperatures around 16°C and an average of 17°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between November and December, with a 3°C shift in average temperatures.

Precipitation

0mm 50mm 100mm 150mm 200mm 250mm 300mm 350mm 400mm 450mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 128mm Feb Precipitation: 107mm Mar Precipitation: 154mm Apr Precipitation: 141mm May Precipitation: 226mm Jun Precipitation: 416mm Jul Precipitation: 176mm Aug Precipitation: 145mm Sep Precipitation: 241mm Oct Precipitation: 164mm Nov Precipitation: 117mm Dec Precipitation: 127mm
Precipitation

Isen is a very wet location, receiving approximately 2141mm of precipitation annually, which averages out to around 178mm per month. The wettest month is June, averaging 416mm of rainfall. September and May also tend to see above-average precipitation. The driest month is February, with just 107mm. That's 309mm less than June, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Wind

0km/h 5km/h 10km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 7km/h Feb Wind Speed: 8km/h Mar Wind Speed: 7km/h Apr Wind Speed: 6km/h May Wind Speed: 6km/h Jun Wind Speed: 7km/h Jul Wind Speed: 6km/h Aug Wind Speed: 7km/h Sep Wind Speed: 7km/h Oct Wind Speed: 7km/h Nov Wind Speed: 7km/h Dec Wind Speed: 8km/h
Wind Speed

Isen is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

Seasons

Winter
Dec 21
Spring
Mar 20
Summer
Jun 21
Autumn
Sep 23

90 days until Autumn

It is currently summer in Isen, which began on June 21, 2026. Isen is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 29°C, while the coldest stretch bottoms out in February near 16°C. Autumn is next, beginning on September 23, 2026 — 90 days from now.

Spring

Temperatures range from 18 to 24°C. Rainfall is heavy, totalling around 521mm across the season with a monthly average of 174mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 25 to 29°C. Rainfall is heavy, totalling around 737mm across the season with a monthly average of 246mm. Winds are generally light, averaging 6km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from 22 to 28°C. Rainfall is heavy, totalling around 521mm across the season with a monthly average of 174mm. Winds are generally light, averaging 7km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 16 to 20°C. Rainfall is heavy, totalling around 362mm across the season with a monthly average of 121mm. Winds are generally light, averaging 8km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.

Monthly Climate Data

The table below shows monthly climate averages for Isen based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
17 °C
19 °C
7 km/h
128 mm
0 cm
Feb
16 °C
19 °C
8 km/h
107 mm
0 cm
Mar
18 °C
20 °C
7 km/h
154 mm
0 cm
Apr
20 °C
21 °C
6 km/h
141 mm
0 cm
May
23 °C
24 °C
6 km/h
226 mm
0 cm
Jun Current
25 °C
27 °C
7 km/h
416 mm
0 cm
Jul
27 °C
29 °C
6 km/h
176 mm
0 cm
Aug
28 °C
29 °C
7 km/h
145 mm
0 cm
Sep
27 °C
28 °C
7 km/h
241 mm
0 cm
Oct
25 °C
26 °C
7 km/h
164 mm
0 cm
Nov
22 °C
24 °C
7 km/h
117 mm
0 cm
Dec
18 °C
20 °C
8 km/h
127 mm
0 cm
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