Climate Insights for Aki

Aki Shi, Kochi Prefecture, Japan

Hottest
August
29°C peak
Coldest
January
6°C low
Wettest
July
447mm rain
Best to Visit
November
Mild temps & low rain

Climate Overview

The climate in Aki is temperate. The average annual temperature is 18°C and approximately 2658mm of precipitation falls per year. Aki receives a notable amount of rainfall throughout the year, including during its driest month. Aki 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 6°C.

Temperature

10° 15° 20° 25° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 11° Average: 9° Min: 6° Feb Max: 11° Average: 9° Min: 7° Mar Max: 14° Average: 12° Min: 9° Apr Max: 18° Average: 16° Min: 13° May Max: 21° Average: 20° Min: 18° Jun Max: 24° Average: 22° Min: 21° Jul Max: 27° Average: 26° Min: 25° Aug Max: 29° Average: 27° Min: 26° Sep Max: 26° Average: 25° Min: 23° Oct Max: 23° Average: 21° Min: 19° Nov Max: 18° Average: 16° Min: 13° Dec Max: 13° Average: 11° Min: 9°
Max
Average
Min

Temperatures in Aki vary considerably across the year, with a 23°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 6°C and an average of 9°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 300mm 350mm 400mm 450mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 94mm Snow: 2mm Feb Precipitation: 115mm Snow: 1mm Mar Precipitation: 162mm Snow: 0mm Apr Precipitation: 207mm Snow: 0mm May Precipitation: 220mm Snow: 0mm Jun Precipitation: 391mm Snow: 0mm Jul Precipitation: 447mm Snow: 0mm Aug Precipitation: 209mm Snow: 0mm Sep Precipitation: 358mm Snow: 0mm Oct Precipitation: 279mm Snow: 0mm Nov Precipitation: 85mm Snow: 0mm Dec Precipitation: 92mm Snow: 0mm
Precipitation
Snow

Aki is a very wet location, receiving approximately 2658mm of precipitation annually, which averages out to around 222mm per month. The wettest month is July, averaging 447mm of rainfall. June and September also tend to see above-average precipitation. The driest month is November, with just 85mm. That's 362mm less than July, 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 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 4km/h Feb Wind Speed: 4km/h Mar Wind Speed: 4km/h Apr Wind Speed: 4km/h May Wind Speed: 3km/h Jun Wind Speed: 4km/h Jul Wind Speed: 3km/h Aug Wind Speed: 3km/h Sep Wind Speed: 4km/h Oct Wind Speed: 4km/h Nov Wind Speed: 3km/h Dec Wind Speed: 4km/h
Wind Speed

Aki is relatively calm, with an average annual wind speed of 4km/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 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

Seasons

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

93 days until Autumn

It is currently summer in Aki, which began on June 21, 2026. Aki 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 January near 6°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

Spring

Temperatures range from 9 to 21°C. Rainfall is heavy, totalling around 589mm across the season with a monthly average of 196mm. Winds are generally light, averaging 4km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 21 to 29°C. Rainfall is heavy, totalling around 1046mm across the season with a monthly average of 349mm. Winds are generally light, averaging 3km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from 13 to 26°C. Rainfall is heavy, totalling around 721mm across the season with a monthly average of 240mm. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 6 to 13°C. Rainfall is heavy, totalling around 302mm across the season with a monthly average of 101mm. Winds are generally light, averaging 4km/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 12°
Apr 16°
May 20°
Jun 22°
Jul 26°
Aug 27°
Sep 25°
Oct 21°
Nov 16°
Dec 11°

The best time to visit Aki is during November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 85mm per month. By contrast, August can be uncomfortably hot with highs reaching 29°C, while January is the coldest period with lows dropping to 6°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 Aki 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
6 °C
11 °C
4 km/h
94 mm
2 cm
Feb
7 °C
11 °C
4 km/h
115 mm
1 cm
Mar
9 °C
14 °C
4 km/h
162 mm
0 cm
Apr
13 °C
18 °C
4 km/h
207 mm
0 cm
May
18 °C
21 °C
3 km/h
220 mm
0 cm
Jun Current
21 °C
24 °C
4 km/h
391 mm
0 cm
Jul
25 °C
27 °C
3 km/h
447 mm
0 cm
Aug
26 °C
29 °C
3 km/h
209 mm
0 cm
Sep
23 °C
26 °C
4 km/h
358 mm
0 cm
Oct
19 °C
23 °C
4 km/h
279 mm
0 cm
Nov
13 °C
18 °C
3 km/h
85 mm
0 cm
Dec
9 °C
13 °C
4 km/h
92 mm
0 cm
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