Climate Insights for Arai

Kosai Shi, Shizuoka, Japan

Hottest
August
33°C peak
Coldest
January
3°C low
Wettest
June
299mm rain
Best to Visit
Varies throughout year

Climate Overview

The climate in Arai is temperate. The average annual temperature is 18°C and approximately 2000mm of precipitation falls per year. Arai receives a notable amount of rainfall throughout the year, including during its driest month. Arai 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 January, February, December, when temperatures can drop to 3°C.

Temperature

10° 20° 30° 40° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 11° Average: 7° Min: 3° Feb Max: 12° Average: 8° Min: 4° Mar Max: 16° Average: 12° Min: 8° Apr Max: 20° Average: 16° Min: 12° May Max: 24° Average: 20° Min: 17° Jun Max: 27° Average: 24° Min: 20° Jul Max: 31° Average: 28° Min: 25° Aug Max: 33° Average: 29° Min: 26° Sep Max: 29° Average: 26° Min: 23° Oct Max: 24° Average: 20° Min: 17° Nov Max: 19° Average: 14° Min: 11° Dec Max: 13° Average: 9° Min: 5°
Max
Average
Min

Temperatures in Arai vary considerably across the year, with a 30°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 33°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 3°C and an average of 7°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Precipitation

0mm 50mm 100mm 150mm 200mm 250mm 300mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 52mm Feb Precipitation: 80mm Mar Precipitation: 140mm Apr Precipitation: 160mm May Precipitation: 201mm Jun Precipitation: 299mm Jul Precipitation: 271mm Aug Precipitation: 185mm Sep Precipitation: 229mm Oct Precipitation: 221mm Nov Precipitation: 102mm Dec Precipitation: 60mm
Precipitation

Arai is a very wet location, receiving approximately 2000mm of precipitation annually, which averages out to around 167mm per month. The wettest month is June, averaging 299mm of rainfall. July and September also tend to see above-average precipitation. The driest month is January, with just 52mm. That's 247mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Wind

0km/h 5km/h 10km/h 15km/h 20km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 17km/h Feb Wind Speed: 17km/h Mar Wind Speed: 15km/h Apr Wind Speed: 14km/h May Wind Speed: 12km/h Jun Wind Speed: 11km/h Jul Wind Speed: 10km/h Aug Wind Speed: 11km/h Sep Wind Speed: 11km/h Oct Wind Speed: 11km/h Nov Wind Speed: 13km/h Dec Wind Speed: 16km/h
Wind Speed

Arai is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 17km/h in winter, 14km/h in spring, 11km/h in summer, 12km/h in autumn.

Seasons

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

7 days until Autumn

It is currently summer in Arai, which began on June 21, 2026. Arai 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 33°C, while the coldest stretch bottoms out in January near 3°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

Spring

Temperatures range from 8 to 24°C. Rainfall is heavy, totalling around 501mm across the season with a monthly average of 167mm. Winds are generally light, averaging 14km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 20 to 33°C. Rainfall is heavy, totalling around 755mm across the season with a monthly average of 252mm. Winds are generally light, averaging 11km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.

Autumn

Temperatures range from 11 to 29°C. Rainfall is heavy, totalling around 552mm across the season with a monthly average of 184mm. Winds are generally light, averaging 12km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 3 to 13°C. Precipitation is moderate at around 192mm for the season, averaging 64mm per month. Winds are moderate at around 17km/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 Arai 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
3 °C
11 °C
17 km/h
52 mm
0 cm
Feb
4 °C
12 °C
17 km/h
80 mm
0 cm
Mar
8 °C
16 °C
15 km/h
140 mm
0 cm
Apr
12 °C
20 °C
14 km/h
160 mm
0 cm
May
17 °C
24 °C
12 km/h
201 mm
0 cm
Jun
20 °C
27 °C
11 km/h
299 mm
0 cm
Jul
25 °C
31 °C
10 km/h
271 mm
0 cm
Aug
26 °C
33 °C
11 km/h
185 mm
0 cm
Sep Current
23 °C
29 °C
11 km/h
229 mm
0 cm
Oct
17 °C
24 °C
11 km/h
221 mm
0 cm
Nov
11 °C
19 °C
13 km/h
102 mm
0 cm
Dec
5 °C
13 °C
16 km/h
60 mm
0 cm
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Metric (°C, km/h)