Climate Insights for Iki

Iki Shi, Nagasaki Prefecture, Japan

Hottest
August
28°C peak
Coldest
February
8°C low
Wettest
July
300mm rain
Best to Visit
November
Mild temps & low rain

Climate Overview

The climate in Iki is temperate. The average annual temperature is 18°C and approximately 1791mm of precipitation falls per year. Iki receives a notable amount of rainfall throughout the year, including during its driest month. Iki 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, December, when temperatures can drop to 8°C. Light snow can occur between January and February.

Temperature

10° 15° 20° 25° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 10° Average: 9° Min: 8° Feb Max: 11° Average: 9° Min: 8° Mar Max: 13° Average: 12° Min: 10° Apr Max: 16° Average: 15° Min: 14° May Max: 20° Average: 19° Min: 18° Jun Max: 22° Average: 22° Min: 21° Jul Max: 26° Average: 26° Min: 25° Aug Max: 28° Average: 28° Min: 27° Sep Max: 26° Average: 25° Min: 24° Oct Max: 21° Average: 21° Min: 20° Nov Max: 17° Average: 16° Min: 15° Dec Max: 12° Average: 11° Min: 9°
Max
Average
Min

Iki sees moderate temperature variation throughout the year, ranging from 8°C to 28°C. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 28°C. February is the coolest month, with minimum temperatures around 8°C and an average of 9°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 5°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: 104mm Snow: 4mm Feb Precipitation: 80mm Snow: 2mm Mar Precipitation: 122mm Snow: 0mm Apr Precipitation: 155mm Snow: 0mm May Precipitation: 136mm Snow: 0mm Jun Precipitation: 223mm Snow: 0mm Jul Precipitation: 300mm Snow: 0mm Aug Precipitation: 155mm Snow: 0mm Sep Precipitation: 229mm Snow: 0mm Oct Precipitation: 125mm Snow: 0mm Nov Precipitation: 66mm Snow: 0mm Dec Precipitation: 96mm Snow: 1mm
Precipitation
Snow

Iki is a fairly wet location, receiving approximately 1791mm of precipitation annually, which averages out to around 149mm per month. The wettest month is July, averaging 300mm of rainfall. September and June also tend to see above-average precipitation. The driest month is November, with just 66mm. That's 235mm 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 February, totalling around 7cm annually. January is the snowiest month with approximately 4cm.

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: 7km/h Mar Wind Speed: 6km/h Apr Wind Speed: 6km/h May Wind Speed: 5km/h Jun Wind Speed: 5km/h Jul Wind Speed: 5km/h Aug Wind Speed: 5km/h Sep Wind Speed: 6km/h Oct Wind Speed: 7km/h Nov Wind Speed: 5km/h Dec Wind Speed: 6km/h
Wind Speed

Iki is relatively calm, with an average annual wind speed of 6km/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 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap 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 Iki, which began on June 21, 2026. Iki 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 28°C, while the coldest stretch bottoms out in February near 8°C. Autumn is next, beginning on September 23, 2026 — 90 days from now.

Spring

Temperatures range from 10 to 20°C. Rainfall is heavy, totalling around 413mm across the season with a monthly average of 138mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 21 to 28°C. Rainfall is heavy, totalling around 678mm across the season with a monthly average of 226mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from 15 to 26°C. Rainfall is heavy, totalling around 420mm across the season with a monthly average of 140mm. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 8 to 12°C. Precipitation is moderate at around 280mm for the season, averaging 93mm per month. Expect around 7cm of snow accumulation during this period. Winds are generally light, averaging 7km/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 15°
May 19°
Jun 22°
Jul 26°
Aug 28°
Sep 25°
Oct 21°
Nov 16°
Dec 11°

The best time to visit Iki is during November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 66mm per month. By contrast, August can be uncomfortably hot with highs reaching 28°C, while February is the coldest period with lows dropping to 8°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

Monthly Climate Data

The table below shows monthly climate averages for Iki 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
8 °C
10 °C
7 km/h
104 mm
4 cm
Feb
8 °C
11 °C
7 km/h
80 mm
2 cm
Mar
10 °C
13 °C
6 km/h
122 mm
0 cm
Apr
14 °C
16 °C
6 km/h
155 mm
0 cm
May
18 °C
20 °C
5 km/h
136 mm
0 cm
Jun Current
21 °C
22 °C
5 km/h
223 mm
0 cm
Jul
25 °C
26 °C
5 km/h
300 mm
0 cm
Aug
27 °C
28 °C
5 km/h
155 mm
0 cm
Sep
24 °C
26 °C
6 km/h
229 mm
0 cm
Oct
20 °C
21 °C
7 km/h
125 mm
0 cm
Nov
15 °C
17 °C
5 km/h
66 mm
0 cm
Dec
9 °C
12 °C
6 km/h
96 mm
1 cm
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