Climate Insights for Sukayama

Katori-gun, Chiba-ken, Japan

Hottest
August
29°C peak
Coldest
January
6°C low
Wettest
October
212mm rain
Best to Visit
Varies throughout year

Climate Overview

The climate in Sukayama is temperate. The average annual temperature is 17°C and approximately 1625mm of precipitation falls per year. Sukayama receives a notable amount of rainfall throughout the year, including during its driest month. Sukayama 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: 10° Average: 8° Min: 6° Feb Max: 10° Average: 8° Min: 6° Mar Max: 14° Average: 11° Min: 9° Apr Max: 17° Average: 15° Min: 13° May Max: 21° Average: 19° Min: 17° Jun Max: 24° Average: 22° Min: 20° Jul Max: 27° Average: 25° Min: 24° Aug Max: 29° Average: 27° Min: 25° Sep Max: 26° Average: 25° Min: 23° Oct Max: 22° Average: 20° Min: 18° Nov Max: 17° Average: 15° Min: 13° Dec Max: 12° Average: 10° Min: 8°
Max
Average
Min

Temperatures in Sukayama 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 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: 72mm Snow: 0mm Feb Precipitation: 81mm Snow: 0mm Mar Precipitation: 147mm Snow: 1mm Apr Precipitation: 128mm Snow: 0mm May Precipitation: 162mm Snow: 0mm Jun Precipitation: 198mm Snow: 0mm Jul Precipitation: 140mm Snow: 0mm Aug Precipitation: 106mm Snow: 0mm Sep Precipitation: 174mm Snow: 0mm Oct Precipitation: 212mm Snow: 0mm Nov Precipitation: 122mm Snow: 0mm Dec Precipitation: 82mm Snow: 0mm
Precipitation
Snow

Sukayama is a fairly wet location, receiving approximately 1625mm of precipitation annually, which averages out to around 135mm per month. The wettest month is October, averaging 212mm of rainfall. June and September also tend to see above-average precipitation. The driest month is January, with just 72mm. That's 140mm less than October, 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 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 18km/h Feb Wind Speed: 19km/h Mar Wind Speed: 19km/h Apr Wind Speed: 19km/h May Wind Speed: 18km/h Jun Wind Speed: 15km/h Jul Wind Speed: 16km/h Aug Wind Speed: 16km/h Sep Wind Speed: 17km/h Oct Wind Speed: 19km/h Nov Wind Speed: 17km/h Dec Wind Speed: 17km/h
Wind Speed

Sukayama is mildly breezy, with an average annual wind speed of 18km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 19km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 15km/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 18km/h in winter, 19km/h in spring, 16km/h in summer, 18km/h in autumn.

Seasons

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

7 days until Autumn

It is currently summer in Sukayama, which began on June 21, 2026. Sukayama 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 (7 days from now).

Spring

Temperatures range from 9 to 21°C. Rainfall is heavy, totalling around 438mm across the season with a monthly average of 146mm. Winds are moderate at around 19km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 20 to 29°C. Rainfall is heavy, totalling around 444mm across the season with a monthly average of 148mm. Winds are moderate at around 16km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.

Autumn

Temperatures range from 13 to 26°C. Rainfall is heavy, totalling around 508mm across the season with a monthly average of 169mm. Winds are moderate at around 18km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 6 to 12°C. Precipitation is moderate at around 235mm for the season, averaging 78mm per month. Winds are moderate at around 18km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.

Monthly Climate Data

The table below shows monthly climate averages for Sukayama 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
10 °C
18 km/h
72 mm
0 cm
Feb
6 °C
10 °C
19 km/h
81 mm
0 cm
Mar
9 °C
14 °C
19 km/h
147 mm
1 cm
Apr
13 °C
17 °C
19 km/h
128 mm
0 cm
May
17 °C
21 °C
18 km/h
162 mm
0 cm
Jun
20 °C
24 °C
15 km/h
198 mm
0 cm
Jul
24 °C
27 °C
16 km/h
140 mm
0 cm
Aug
25 °C
29 °C
16 km/h
106 mm
0 cm
Sep Current
23 °C
26 °C
17 km/h
174 mm
0 cm
Oct
18 °C
22 °C
19 km/h
212 mm
0 cm
Nov
13 °C
17 °C
17 km/h
122 mm
0 cm
Dec
8 °C
12 °C
17 km/h
82 mm
0 cm
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Metric (°C, km/h)