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Kumamoto Castle's black multi-tiered keep rising above its curved stone walls

Photo: Kumamoto Castle 06s5s4272.jpg by 663highland (CC BY 2.5, cropped), via Wikimedia Commons.

Kumamoto weather by month: temperature, rain and what to wear

Kumamoto's average high runs from 10.7°C (51°F) in January to 33.3°C (92°F) in August (JMA, 1991–2020). The wettest month is June (448.5 mm) and the driest is January (57.2 mm).

When to go to Kumamoto, by the numbers

  • Months with average highs between 15°C and 25°C and fewer than 10 wet days: April, October and November.
  • Fewest wet days: January (6.5 days) and October (6.5 days).
  • Quietest hotels in 2025 (Kumamoto Prefecture): January (49.7%), June (50.9%) and July (53.7%).
  • Busiest hotels in 2025 (Kumamoto Prefecture): November (67.9%), October (64.7%) and March (62.8%).
  • Plum blossom: around 3 February on average.
  • Cherry blossom: around 22 March on average.
  • Hydrangea: around 1 June on average.
  • Autumn leaves (maple): around 2 December on average.
  • Ginkgo turns yellow: around 27 November on average.

What to wear in Kumamoto, month by month

Kumamoto: our clothing level for each month (from the JMA's averages)
MonthLevelAverage highWet days
JanuaryChilly10.7°C6.5 days
FebruaryChilly12.4°C7.8 days
MarchCool16.1°C10.4 days
AprilMild21.4°C9.4 days
MayWarm26.0°C9.2 days
JuneWarm28.1°C14.1 days
JulyHot31.8°C12.3 days
AugustHot33.3°C10.2 days
SeptemberHot30.1°C9.3 days
OctoberWarm25.0°C6.5 days
NovemberCool18.8°C7.3 days
DecemberChilly12.9°C6.9 days

How busy Kumamoto is, month by month

How full hotels across Kumamoto Prefecture were, month by month in 2025 (%)

Average room occupancy for all hotels and inns (Japan Tourism Agency).

  1. Jan49.7%
  2. Feb60.2%
  3. Mar62.8%
  4. Apr58.8%
  5. May59.8%
  6. Jun50.9%
  7. Jul53.7%
  8. Aug59.8%
  9. Sep59.3%
  10. Oct64.7%
  11. Nov67.9%
  12. Dec58.4%

Frequently asked questions

When is the best time to visit Kumamoto?

Months with average highs between 15°C and 25°C and fewer than 10 wet days: April, October and November. Fewest wet days: January (6.5 days) and October (6.5 days).

What is the hottest month in Kumamoto?

August has the highest average high, 33.3°C (92°F). January has the lowest, 10.7°C (51°F) (JMA, 1991–2020).

What is the rainiest month in Kumamoto?

June has the most precipitation (448.5 mm), and June has the most wet days (14.1 days) (JMA, 1991–2020).

Kumamoto weather month by month

Averages for 1991–2020 at the JMA's Kumamoto station (38 m above sea level). Months with their own page are linked; the others follow.

Kumamoto by month: averages for 1991–2020 (JMA)
MonthHighLowPrecipitationWet daysSunshine
January10.7°C1.6°C57.2 mm6.5 days133 hours
February12.4°C2.6°C83.2 mm7.8 days141 hours
March16.1°C5.9°C124.8 mm10.4 days170 hours
April21.4°C10.6°C144.9 mm9.4 days184 hours
May26.0°C15.6°C160.9 mm9.2 days194 hours
June28.1°C20.2°C448.5 mm14.1 days131 hours
July31.8°C24.2°C386.8 mm12.3 days177 hours
August33.3°C24.8°C195.4 mm10.2 days206 hours
September30.1°C21.2°C172.6 mm9.3 days176 hours
October25.0°C14.9°C87.1 mm6.5 days187 hours
November18.8°C8.8°C84.4 mm7.3 days154 hours
December12.9°C3.4°C61.2 mm6.9 days143 hours
Average high in Kumamoto, month by month (°C)
  1. Jan10.7°C
  2. Feb12.4°C
  3. Mar16.1°C
  4. Apr21.4°C
  5. May26.0°C
  6. Jun28.1°C
  7. Jul31.8°C
  8. Aug33.3°C
  9. Sep30.1°C
  10. Oct25.0°C
  11. Nov18.8°C
  12. Dec12.9°C

Events in Kumamoto through the year

Events in Kumamoto: dates from each organizer's official page
EventMonthWhen
Kumamoto Castle New Year's Day event熊本城迎春行事Jan1 January every year Official page
Old Amulet Rite (Koshinpu Shusatsu Kamiage-sai), Izumi Shrine and Inari Shrine古神符守札神上祭（出水神社・稲荷神社）JanEvery year on 15 January Official page
Kumamoto Spring Plant Marketくまもと春の植木市Feb and MarFebruary to mid-March. 1 February – 11 March 2026. Official page
Kumamoto Castle Marathon 2027熊本城マラソン2027Feb21 February 2027 Official page
Suizenji Jojuen Garden Festival水前寺成趣園まつりMarLate March, two days. 28–29 March 2026. Official page
Hatsuuma-sai, Inari Shrine (Suizenji Jojuen Garden)初午祭（稲荷神社）MarThe first Day of the Horse in March Official page
Spring Grand Festival, Izumi Shrine (Suizenji Jojuen Garden)出水神社 春季大祭AprLate April, for about a week (19 to 24 April in 2026) Official page
Lux Night KUMAMOTO 2026Nov and DecEarly November to early December. 6 November – 6 December 2026. Official page
Kumamoto Flower Expo 2026くまもと花博2026NovLate November, about ten days. 20–29 November 2026. Official page
Suizenji White Xmas 2026水前寺 White Xmas 2026DecEarly December, three days. 4–6 December 2026. Official page
Ueki Art SPA Yugento 2026Ueki Art SPA 「湯幻灯 2026」DecMid to late December. 11–25 December 2026. Official page

Related items

Kumamoto in JanuaryChillyA warm jacket or light coat over a sweater.High10.7°CLow1.6°CPrecipitation57.2 mmWet days6.5 daysKumamoto in FebruaryChillyA warm jacket or light coat over a sweater.High12.4°CLow2.6°CPrecipitation83.2 mmWet days7.8 daysKumamoto in MarchCoolLong sleeves with a light jacket or sweater.High16.1°CLow5.9°CPrecipitation124.8 mmWet days10.4 daysKumamoto in AprilMildLong sleeves, or a T-shirt and a light jacket.High21.4°CLow10.6°CPrecipitation144.9 mmWet days9.4 days

Back to Japan by month

Read more

Sources for this page

Show all 15
  1. Normals for 1991–2020: Kumamoto (熊本), month by month (平年値 年・月ごとの値)Japan Meteorological Agency (JMA)
  2. Normals for 1991–2020: Kumamoto (熊本), rain days, temperature days and snow (詳細)Japan Meteorological Agency (JMA)
  3. Overnight Travel Statistics Survey, 2025 final figures (宿泊旅行統計調査 2025年 年の確定値)Japan Tourism Agency
  4. Biological season observations (生物季節観測の情報)Japan Meteorological Agency (JMA)
  5. Yearly records of flowering and leaf colour since 1953 (生物季節観測累年値)Japan Meteorological Agency (JMA)
  6. Kumamoto Castle New Year's Day event (熊本城迎春行事)Kumamoto City Tourism (kumamoto-guide.jp) / Kumamoto Castle official site
  7. Old Amulet Rite (Koshinpu Shusatsu Kamiage-sai), Izumi Shrine and Inari Shrine (古神符守札神上祭（出水神社・稲荷神社）)Suizenji Jojuen Garden / Izumi Shrine
  8. Kumamoto Spring Plant Market (くまもと春の植木市)Kumamoto City Tourism (kumamoto-guide.jp)
  9. Kumamoto Castle Marathon 2027 (熊本城マラソン2027)Kumamoto Castle Marathon Executive Committee / Kumamoto City
  10. Suizenji Jojuen Garden Festival (水前寺成趣園まつり)Kumamoto City Tourism (kumamoto-guide.jp)
  11. Spring Grand Festival, Izumi Shrine (Suizenji Jojuen Garden) (出水神社 春季大祭)Suizenji Jojuen Garden / Izumi Shrine
  12. Lux Night KUMAMOTO 2026Kumamoto City Tourism (kumamoto-guide.jp)
  13. Kumamoto Flower Expo 2026 (くまもと花博2026)Kumamoto City Tourism (kumamoto-guide.jp)
  14. Suizenji White Xmas 2026 (水前寺 White Xmas 2026)Kumamoto City Tourism (kumamoto-guide.jp)
  15. Ueki Art SPA Yugento 2026 (Ueki Art SPA 「湯幻灯 2026」)Kumamoto City Tourism (kumamoto-guide.jp)