Climate Insights for Iki

Iki Shi, Nagasaki Prefecture, Japan

Hottest
August
28°C peak
Coldest
January
8°C low
Wettest
July
241mm rain
Best to Visit
October
Mild temps & low rain

Climate Overview

The climate in Iki is temperate. The average annual temperature is 18°C and approximately 1763mm 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 January, February, December, when temperatures can drop to 8°C.

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: 11° Apr Max: 16° Average: 15° Min: 14° May Max: 19° 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: 22° 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. January 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 6°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: 88mm Snow: 3mm Feb Precipitation: 80mm Snow: 1mm Mar Precipitation: 115mm Snow: 0mm Apr Precipitation: 153mm Snow: 0mm May Precipitation: 141mm Snow: 0mm Jun Precipitation: 222mm Snow: 0mm Jul Precipitation: 241mm Snow: 0mm Aug Precipitation: 210mm Snow: 0mm Sep Precipitation: 230mm Snow: 0mm Oct Precipitation: 99mm Snow: 0mm Nov Precipitation: 104mm Snow: 0mm Dec Precipitation: 81mm Snow: 0mm
Precipitation
Snow

Iki is a fairly wet location, receiving approximately 1763mm of precipitation annually, which averages out to around 147mm per month. The wettest month is July, averaging 241mm of rainfall. September and June also tend to see above-average precipitation. The driest month is February, with just 80mm. That's 160mm 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.

Wind

0km/h 5km/h 10km/h 15km/h 20km/h 25km/h 30km/h 35km/h 40km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 36km/h Feb Wind Speed: 35km/h Mar Wind Speed: 33km/h Apr Wind Speed: 32km/h May Wind Speed: 28km/h Jun Wind Speed: 26km/h Jul Wind Speed: 27km/h Aug Wind Speed: 28km/h Sep Wind Speed: 32km/h Oct Wind Speed: 34km/h Nov Wind Speed: 32km/h Dec Wind Speed: 34km/h
Wind Speed

Iki is very windy, with an average annual wind speed of 32km/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 36km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in June, with average winds dropping to 26km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 10km/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 35km/h in winter, 31km/h in spring, 27km/h in summer, 33km/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 Iki, which began on March 20, 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 January near 8°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

Spring

Temperatures range from 11 to 19°C. Rainfall is heavy, totalling around 409mm across the season with a monthly average of 136mm. Winds are strong, averaging 31km/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 673mm across the season with a monthly average of 224mm. Winds are strong, averaging 27km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.

Autumn

Temperatures range from 15 to 26°C. Rainfall is heavy, totalling around 432mm across the season with a monthly average of 144mm. Winds are strong, averaging 33km/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 249mm for the season, averaging 83mm per month. Winds are strong, averaging 35km/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 October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 99mm per month. By contrast, August can be uncomfortably hot with highs reaching 28°C, while January is the coldest period with lows dropping to 8°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 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. 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
36 km/h
88 mm
3 cm
Feb
8 °C
11 °C
35 km/h
80 mm
1 cm
Mar Current
11 °C
13 °C
33 km/h
115 mm
0 cm
Apr
14 °C
16 °C
32 km/h
153 mm
0 cm
May
18 °C
19 °C
28 km/h
141 mm
0 cm
Jun
21 °C
22 °C
26 km/h
222 mm
0 cm
Jul
25 °C
26 °C
27 km/h
241 mm
0 cm
Aug
27 °C
28 °C
28 km/h
210 mm
0 cm
Sep
24 °C
26 °C
32 km/h
230 mm
0 cm
Oct
20 °C
22 °C
34 km/h
99 mm
0 cm
Nov
15 °C
17 °C
32 km/h
104 mm
0 cm
Dec
9 °C
12 °C
34 km/h
81 mm
0 cm
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Metric (°C, km/h)