Climate Insights for Harai

Chikujō-gun, Fukuoka Prefecture, Japan

Hottest
August
31°C peak
Coldest
January
3°C low
Wettest
July
270mm rain
Best to Visit
October
Mild temps & low rain

Climate Overview

The climate in Harai is temperate. The average annual temperature is 17°C and approximately 1662mm of precipitation falls per year. Harai receives a notable amount of rainfall throughout the year, including during its driest month. Harai 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. Light snow can occur between January and December.

Temperature

10° 20° 30° 40° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 9° Average: 6° Min: 3° Feb Max: 10° Average: 7° Min: 4° Mar Max: 14° Average: 11° Min: 7° Apr Max: 19° Average: 15° Min: 12° May Max: 23° Average: 20° Min: 17° Jun Max: 26° Average: 23° Min: 21° Jul Max: 30° Average: 27° Min: 25° Aug Max: 31° Average: 28° Min: 25° Sep Max: 27° Average: 25° Min: 22° Oct Max: 22° Average: 19° Min: 16° Nov Max: 17° Average: 14° Min: 11° Dec Max: 11° Average: 8° Min: 5°
Max
Average
Min

Temperatures in Harai vary considerably across the year, with a 28°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 31°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 3°C and an average of 6°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between November and December, 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: 69mm Snow: 5mm Feb Precipitation: 78mm Snow: 2mm Mar Precipitation: 112mm Snow: 0mm Apr Precipitation: 129mm Snow: 0mm May Precipitation: 156mm Snow: 0mm Jun Precipitation: 264mm Snow: 0mm Jul Precipitation: 270mm Snow: 0mm Aug Precipitation: 182mm Snow: 0mm Sep Precipitation: 178mm Snow: 0mm Oct Precipitation: 93mm Snow: 0mm Nov Precipitation: 74mm Snow: 0mm Dec Precipitation: 56mm Snow: 1mm
Precipitation
Snow

Harai is a fairly wet location, receiving approximately 1662mm of precipitation annually, which averages out to around 139mm per month. The wettest month is July, averaging 270mm of rainfall. June and August also tend to see above-average precipitation. The driest month is December, with just 56mm. That's 214mm less than July, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and December, totalling around 8cm annually. January is the snowiest month with approximately 5cm.

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: 16km/h Feb Wind Speed: 16km/h Mar Wind Speed: 14km/h Apr Wind Speed: 14km/h May Wind Speed: 13km/h Jun Wind Speed: 13km/h Jul Wind Speed: 12km/h Aug Wind Speed: 13km/h Sep Wind Speed: 13km/h Oct Wind Speed: 13km/h Nov Wind Speed: 13km/h Dec Wind Speed: 16km/h
Wind Speed

Harai is mildly breezy, with an average annual wind speed of 14km/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 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h 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 16km/h in winter, 14km/h in spring, 13km/h in summer, 13km/h in autumn.

Seasons

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

89 days until Summer

It is currently spring in Harai, which began on March 20, 2026. Harai 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 31°C, while the coldest stretch bottoms out in January near 3°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

Spring

Temperatures range from 7 to 23°C. Rainfall is heavy, totalling around 398mm across the season with a monthly average of 133mm. Winds are generally light, averaging 14km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 21 to 31°C. Rainfall is heavy, totalling around 716mm across the season with a monthly average of 239mm. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from 11 to 27°C. Rainfall is heavy, totalling around 345mm across the season with a monthly average of 115mm. Winds are generally light, averaging 13km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 3 to 11°C. Precipitation is moderate at around 203mm for the season, averaging 68mm per month. Expect around 8cm of snow accumulation during this period. Winds are moderate at around 16km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.

Best Time to Visit

Jan
Feb
Mar 11°
Apr 15°
May 20°
Jun 23°
Jul 27°
Aug 28°
Sep 25°
Oct 19°
Nov 14°
Dec

The best time to visit Harai is during October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 93mm per month. By contrast, August can be uncomfortably hot with highs reaching 31°C, while January is the coldest period with lows dropping to 3°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

Monthly Climate Data

The table below shows monthly climate averages for Harai 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. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. 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
9 °C
16 km/h
69 mm
5 cm
Feb
4 °C
10 °C
16 km/h
78 mm
2 cm
Mar Current
7 °C
14 °C
14 km/h
112 mm
0 cm
Apr
12 °C
19 °C
14 km/h
129 mm
0 cm
May
17 °C
23 °C
13 km/h
156 mm
0 cm
Jun
21 °C
26 °C
13 km/h
264 mm
0 cm
Jul
25 °C
30 °C
12 km/h
270 mm
0 cm
Aug
25 °C
31 °C
13 km/h
182 mm
0 cm
Sep
22 °C
27 °C
13 km/h
178 mm
0 cm
Oct
16 °C
22 °C
13 km/h
93 mm
0 cm
Nov
11 °C
17 °C
13 km/h
74 mm
0 cm
Dec
5 °C
11 °C
16 km/h
56 mm
1 cm
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Metric (°C, km/h)