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Night view of Nagasaki's hillside city lights and harbor seen from Mount Inasa

Photo: Nagasaki City view from Mt Inasa06s.jpg by 663highland (CC BY 2.5, cropped), via Wikimedia Commons.

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

Nagasaki's average high runs from 10.7°C (51°F) in January to 31.9°C (89°F) in August (JMA, 1991–2020). The wettest month is June (335.9 mm) and the driest is January (63.1 mm).

When to go to Nagasaki, by the numbers

  • Months with average highs between 15°C and 25°C and fewer than 10 wet days: April, May, October and November.
  • Fewest wet days: October (5.8 days).
  • Quietest hotels in 2025 (Nagasaki Prefecture): January (46.0%), June (49.5%) and July (51.2%).
  • Busiest hotels in 2025 (Nagasaki Prefecture): November (67.5%), October (62.0%) and August (59.9%).
  • Plum blossom: around 24 January on average.
  • Cherry blossom: around 23 March on average.
  • Hydrangea: around 6 June on average.
  • Autumn leaves (maple): around 7 December on average.
  • Ginkgo turns yellow: around 5 December on average.

What to wear in Nagasaki, month by month

Nagasaki: our clothing level for each month (from the JMA's averages)
MonthLevelAverage highWet days
JanuaryChilly10.7°C9.0 days
FebruaryChilly12.0°C8.7 days
MarchCool15.3°C10.1 days
AprilCool19.9°C9.2 days
MayMild23.9°C9.1 days
JuneWarm26.5°C13.0 days
JulyHot30.3°C10.7 days
AugustHot31.9°C9.9 days
SeptemberWarm28.9°C9.0 days
OctoberMild24.1°C5.8 days
NovemberCool18.5°C8.2 days
DecemberChilly13.1°C8.2 days

How busy Nagasaki is, month by month

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

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

  1. Jan46.0%
  2. Feb57.0%
  3. Mar58.3%
  4. Apr53.4%
  5. May58.2%
  6. Jun49.5%
  7. Jul51.2%
  8. Aug59.9%
  9. Sep52.5%
  10. Oct62.0%
  11. Nov67.5%
  12. Dec59.9%

Frequently asked questions

When is the best time to visit Nagasaki?

Months with average highs between 15°C and 25°C and fewer than 10 wet days: April, May, October and November. Fewest wet days: October (5.8 days).

What is the hottest month in Nagasaki?

August has the highest average high, 31.9°C (89°F). January has the lowest, 10.7°C (51°F) (JMA, 1991–2020).

What is the rainiest month in Nagasaki?

June has the most precipitation (335.9 mm), and June has the most wet days (13.0 days) (JMA, 1991–2020).

Nagasaki weather month by month

Averages for 1991–2020 at the JMA's Nagasaki station (27 m above sea level). Months with their own page are linked; the others follow.

Nagasaki by month: averages for 1991–2020 (JMA)
MonthHighLowPrecipitationWet daysSunshine
January10.7°C4.0°C63.1 mm9.0 days104 hours
February12.0°C4.5°C84.0 mm8.7 days122 hours
March15.3°C7.5°C123.2 mm10.1 days160 hours
April19.9°C11.7°C153.0 mm9.2 days178 hours
May23.9°C16.1°C160.7 mm9.1 days190 hours
June26.5°C20.2°C335.9 mm13.0 days125 hours
July30.3°C24.5°C292.7 mm10.7 days175 hours
August31.9°C25.3°C217.9 mm9.9 days207 hours
September28.9°C21.9°C186.6 mm9.0 days172 hours
October24.1°C16.5°C102.1 mm5.8 days179 hours
November18.5°C11.0°C100.7 mm8.2 days137 hours
December13.1°C6.0°C74.8 mm8.2 days114 hours
Average high in Nagasaki, month by month (°C)
  1. Jan10.7°C
  2. Feb12.0°C
  3. Mar15.3°C
  4. Apr19.9°C
  5. May23.9°C
  6. Jun26.5°C
  7. Jul30.3°C
  8. Aug31.9°C
  9. Sep28.9°C
  10. Oct24.1°C
  11. Nov18.5°C
  12. Dec13.1°C

Events in Nagasaki through the year

Events in Nagasaki: dates from each organizer's official page
EventMonthWhen
Nanakosan Meguri (seven temples pilgrimage)七高山めぐりJanAbout 2 to 15 January every year Official page
Nomozaki Daffodil Festivalのもざき水仙まつりJan and FebUsually late January to early February. 31 January – 15 February 2026. Official page
Nagasaki Sansha-mairi (New Year three-shrine visit)長崎三社参りJanNew Year period (shogatsu) Official page
Setsubun festivals at Nagasaki temples and shrines節分祭FebAround 3 and 4 February every year Official page
Nagasaki Lantern Festival長崎ランタンフェスティバルFebEarly to late February. 5–21 February 2027. Official page
Memorial Mass for the Twenty-Six Martyrs of Japan日本二十六聖人殉教記念ミサFebFirst Sunday of February every year Official page
Kaoyaki Tulip Festival香焼チューリップまつりMarUsually mid-March. 20–29 March 2026. Official page
Anniversary of the Discovery of the Hidden Christians日本の信徒発見記念日Mar17 March every year Official page
Kazagashira Park Cherry Blossom Festival風頭公園桜まつりMar and AprUsually late March into early April. 27 March – 5 April 2026. Official page
Tateyama Park Cherry Blossom Festival立山公園さくらまつりMar and AprUsually late March into early April. 27 March – 5 April 2026. Official page
Dejima Oranje Festival出島オラニエ・フェスティバルAprLate April, two days. 25–26 April 2026. Official page
Inasayama Azalea Festival稲佐山つつじまつりApr and MayUsually late April to early May. 25 April – 10 May 2026. Official page
Nagasaki Bayside Marathon 20262026長崎ベイサイドマラソンNovMid-November. 15 November 2026. Official page
Shichi-go-san Festival, Suwa Shrine七五三祭（諏訪神社）Nov15 November Official page
Shinkoku Kansha-sai (Niiname-sai), Suwa Shrine新穀感謝祭（新嘗祭）（諏訪神社）Nov23 November Official page
Momote Shinji (arrow purification rite), Suwa Shrine百手神事（諏訪神社）DecLate December Official page
Susuharai Shinji (year-end cleaning rite), Suwa Shrine煤払い神事（諏訪神社）Dec29 December Official page

Related items

Nagasaki in JanuaryChillyA warm jacket or light coat over a sweater.High10.7°CLow4.0°CPrecipitation63.1 mmWet days9.0 daysNagasaki in FebruaryChillyA warm jacket or light coat over a sweater.High12.0°CLow4.5°CPrecipitation84.0 mmWet days8.7 daysNagasaki in MarchCoolLong sleeves with a light jacket or sweater.High15.3°CLow7.5°CPrecipitation123.2 mmWet days10.1 daysNagasaki in AprilCoolLong sleeves with a light jacket or sweater.High19.9°CLow11.7°CPrecipitation153.0 mmWet days9.2 days

Back to Japan by month

Read more

Sources for this page

Show all 19
  1. Normals for 1991–2020: Nagasaki (長崎), month by month (平年値 年・月ごとの値)Japan Meteorological Agency (JMA)
  2. Normals for 1991–2020: Nagasaki (長崎), 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. Nanakosan Meguri (seven temples pilgrimage) (七高山めぐり)Nagasaki City Tourism (travel nagasaki)
  7. Nomozaki Daffodil Festival (のもざき水仙まつり)Nagasaki City Tourism (travel nagasaki)
  8. Nagasaki Sansha-mairi (New Year three-shrine visit) (長崎三社参り)Nagasaki City Tourism (travel nagasaki)
  9. Setsubun festivals at Nagasaki temples and shrines (節分祭)Nagasaki City Tourism (travel nagasaki)
  10. Nagasaki Lantern Festival (長崎ランタンフェスティバル)Nagasaki City Tourism (travel nagasaki)
  11. Memorial Mass for the Twenty-Six Martyrs of Japan (日本二十六聖人殉教記念ミサ)Nagasaki City Tourism (travel nagasaki)
  12. Kaoyaki Tulip Festival (香焼チューリップまつり)Nagasaki City Tourism (travel nagasaki)
  13. Anniversary of the Discovery of the Hidden Christians (日本の信徒発見記念日)Nagasaki City Tourism (travel nagasaki)
  14. Kazagashira Park Cherry Blossom Festival (風頭公園桜まつり)Nagasaki City Tourism (travel nagasaki)
  15. Tateyama Park Cherry Blossom Festival (立山公園さくらまつり)Nagasaki City Tourism (travel nagasaki)
  16. Dejima Oranje Festival (出島オラニエ・フェスティバル)Nagasaki City Tourism (travel nagasaki)
  17. Inasayama Azalea Festival (稲佐山つつじまつり)Nagasaki City Tourism (travel nagasaki)
  18. Nagasaki Bayside Marathon 2026 (2026長崎ベイサイドマラソン)City of Nagasaki (Bayside Marathon Executive Committee)
  19. Shichi-go-san Festival, Suwa Shrine (七五三祭（諏訪神社）)Suwa Shrine (Chinzei Taisha Suwa Jinja)