Climate Insights for Ashiya Ab

Onga-gun, Fukuoka Prefecture, Japan

Hottest
August
31°C peak
Coldest
January
5°C low
Wettest
July
241mm rain
Best to Visit
October
Mild temps & low rain

Climate Overview

The climate in Ashiya Ab is temperate. The average annual temperature is 17°C and approximately 1752mm of precipitation falls per year. Ashiya Ab receives a notable amount of rainfall throughout the year, including during its driest month. Ashiya Ab 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 5°C. Light snow can occur between January and December.

Temperature

0° 10° 20° 30° 40° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 10° Average: 8° Min: 5° Feb Max: 10° Average: 8° Min: 6° Mar Max: 14° Average: 12° Min: 9° Apr Max: 18° Average: 15° Min: 13° May Max: 22° Average: 19° Min: 17° Jun Max: 25° Average: 23° Min: 21° Jul Max: 29° Average: 27° Min: 25° Aug Max: 31° Average: 28° Min: 26° Sep Max: 28° Average: 25° Min: 23° Oct Max: 23° Average: 20° Min: 18° Nov Max: 17° Average: 15° Min: 13° Dec Max: 11° Average: 9° Min: 7°
Max
Average
Min

Temperatures in Ashiya Ab vary considerably across the year, with a 26°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 5°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between November and December, with a 5°C shift in average temperatures.

Precipitation

0mm 50mm 100mm 150mm 200mm 250mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 86mm Snow: 8mm Feb Precipitation: 93mm Snow: 4mm Mar Precipitation: 134mm Snow: 0mm Apr Precipitation: 149mm Snow: 0mm May Precipitation: 153mm Snow: 0mm Jun Precipitation: 235mm Snow: 0mm Jul Precipitation: 241mm Snow: 0mm Aug Precipitation: 204mm Snow: 0mm Sep Precipitation: 206mm Snow: 0mm Oct Precipitation: 97mm Snow: 0mm Nov Precipitation: 75mm Snow: 0mm Dec Precipitation: 80mm Snow: 2mm
Precipitation
Snow

Ashiya Ab is a fairly wet location, receiving approximately 1752mm of precipitation annually, which averages out to around 146mm per month. The wettest month is July, averaging 241mm of rainfall. June and September also tend to see above-average precipitation. The driest month is November, with just 75mm. That's 166mm 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 14cm annually. January is the snowiest month with approximately 8cm.

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: 18km/h Feb Wind Speed: 18km/h Mar Wind Speed: 16km/h Apr Wind Speed: 15km/h May Wind Speed: 14km/h Jun Wind Speed: 13km/h Jul Wind Speed: 13km/h Aug Wind Speed: 14km/h Sep Wind Speed: 15km/h Oct Wind Speed: 15km/h Nov Wind Speed: 15km/h Dec Wind Speed: 18km/h
Wind Speed

Ashiya Ab is mildly breezy, with an average annual wind speed of 15km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/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 18km/h in winter, 15km/h in spring, 13km/h in summer, 15km/h in autumn.

Seasons

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

87 days until Winter

It is currently autumn in Ashiya Ab, which began on September 23, 2026. Ashiya Ab 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 5°C. Winter is next, beginning on December 21, 2026 (87 days from now).

Spring

Temperatures range from 9 to 22°C. Rainfall is heavy, totalling around 436mm across the season with a monthly average of 145mm. Winds are moderate at around 15km/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 680mm across the season with a monthly average of 227mm. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.

Autumn

Temperatures range from 13 to 28°C. Rainfall is heavy, totalling around 378mm across the season with a monthly average of 126mm. Winds are generally light, averaging 15km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 5 to 11°C. Precipitation is moderate at around 259mm for the season, averaging 86mm per month. Expect around 14cm of snow accumulation during this period. Winds are moderate at around 18km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.

Best Time to Visit

Jan 8°
Feb 8°
Mar 12°
Apr 15°
May 19°
Jun 23°
Jul 27°
Aug 28°
Sep 25°
Oct 20°
Nov 15°
Dec 9°

The best time to visit Ashiya Ab is during October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 97mm per month. By contrast, August can be uncomfortably hot with highs reaching 31°C, while January is the coldest period with lows dropping to 5°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 Ashiya Ab 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
5 °C
10 °C
18 km/h
86 mm
8 cm
Feb
6 °C
10 °C
18 km/h
93 mm
4 cm
Mar
9 °C
14 °C
16 km/h
134 mm
0 cm
Apr
13 °C
18 °C
15 km/h
149 mm
0 cm
May
17 °C
22 °C
14 km/h
153 mm
0 cm
Jun
21 °C
25 °C
13 km/h
235 mm
0 cm
Jul
25 °C
29 °C
13 km/h
241 mm
0 cm
Aug
26 °C
31 °C
14 km/h
204 mm
0 cm
Sep Current
23 °C
28 °C
15 km/h
206 mm
0 cm
Oct
18 °C
23 °C
15 km/h
97 mm
0 cm
Nov
13 °C
17 °C
15 km/h
75 mm
0 cm
Dec
7 °C
11 °C
18 km/h
80 mm
2 cm
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Metric (°C, km/h)