The best times to visit Nagasaki for ideal weather are

April 9th to June 24th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Nagasaki Travel Info

Weather in Nagasaki


Average temperatures in Nagasaki vary drastically. Considering humidity, temperatures feel nice some of the year, but often too hot in the summer and cold in the winter with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 26th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Nagasaki, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally early to mid August where highs are regularly around 91.1°F (32.8°C) with temperatures rarely dropping below 78.4°F (25.8°C) at night.

Nagasaki Temperatures (Fahrenheit)


Nagasaki Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Nagasaki Perceived Temperature (F)


Nagasaki Perceived Temperature (C)



Average Nagasaki Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 50.6 44.4 37.4
Feb 54.1 47.2 39.6
Mar 59.5 52.4 44.2
Apr 67.3 59.5 51.3
May 75 67.3 59.8
Jun 78.8 73 68
Jul 86.4 80.4 75.6
Aug 89.5 82.6 77.2
Sep 84.4 77.1 71
Oct 75.8 68.2 60.9
Nov 64.7 57.7 50.7
Dec 54.4 48.1 41.3

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 10.3 6.9 3
Feb 12.3 8.4 4.2
Mar 15.3 11.3 6.8
Apr 19.6 15.3 10.7
May 23.9 19.6 15.4
Jun 26 22.8 20
Jul 30.2 26.9 24.2
Aug 31.9 28.1 25.1
Sep 29.1 25.1 21.7
Oct 24.3 20.1 16.1
Nov 18.2 14.3 10.4
Dec 12.4 8.9 5.2



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Nagasaki are January, October, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid October. For example, on the week of October 15th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in mid June with an average of 4 days of significant precipitation the week of June 18th.

When can you find snow in Nagasaki? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Nagasaki.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Nagasaki (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 17% 0 2.4
Feb 25% 0 4.1
Mar 26% 0 5.5
Apr 24% 0 5.7
May 24% 0 6.5
Jun 43% 0 15.4
Jul 31% 0 10.4
Aug 31% 0 8.8
Sep 21% 0 5.8
Oct 17% 0 5.6
Nov 22% 0 4.8
Dec 26% 0 4.1

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 17 0 6.1
Feb 25 0 10.4
Mar 26 0 14
Apr 24 0 14.5
May 24 0 16.5
Jun 43 0 39.1
Jul 31 0 26.4
Aug 31 0 22.4
Sep 21 0 14.7
Oct 17 0 14.2
Nov 22 0 12.2
Dec 26 0 10.4


Humidity and Wind

Nagasaki has some very humid months, with other comfortably humid months. The least humid month is March (53.1% relative humidity), and the most humid month is June (76.1%).

Wind in Nagasaki is usually calm. The windiest month is March, followed by July and April. March’s average wind speed of around 5.2 knots (6 MPH or 9.6 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid March where average top sustained speeds reach 11.8 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Nagasaki.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 4.3 Light breeze 9.3 Gentle breeze
Feb 4.5 Light breeze 9.5 Gentle breeze
Mar 5.2 Light breeze 10.8 Gentle breeze
Apr 5 Light breeze 10.5 Gentle breeze
May 4.4 Light breeze 9.4 Gentle breeze
Jun 4.1 Light breeze 8.4 Gentle breeze
Jul 5 Light breeze 9.6 Gentle breeze
Aug 4.3 Light breeze 8.6 Gentle breeze
Sep 4 Light breeze 8.2 Gentle breeze
Oct 3.9 Barely noticeable 8.4 Gentle breeze
Nov 4 Light breeze 8.5 Gentle breeze
Dec 4.6 Light breeze 9.7 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 54%
Feb 55%
Mar 53.1%
Apr 55.6%
May 61.8%
Jun 76.1%
Jul 75.2%
Aug 70.4%
Sep 65.8%
Oct 57.7%
Nov 59.4%
Dec 57.2%


Is it Safe to Travel to Nagasaki?

Our best data indicates this area is generally safe, except in a few regions. As of Oct 07, 2019 there are regional travel advisories for Japan; exercise normal security precautions and avoid some areas. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Oct 01, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Nagasaki, Japan is February, followed by March and July. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Nagasaki in October. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 48 in October means 48% of the tourists vs. February.



Overall Nagasaki Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 77.3°F (25.2°C) and 55.3°F (12.9°C) with warmer temperatures in the later months. Rain is somewhat common with 7 to 8 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the most precipitation with 9 to 13 days of precipitation per month. June – August is the busiest season for tourism in Nagasaki, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 86.1°F (30.1°C) and 60.3°F (15.7°C), which will feel very nice given the humidity and wind. It rains or snows a significant amount: 5 to 6 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Nagasaki to be enjoyable for warm weather travelers. The average high during this season is between 57.7°F (14.3°C) and 49.3°F (9.6°C). On average, it rains or snows a fair amount: 5 to 8 times per month. These times of year are the second busiest with tourists.


Best Times to TravelJapan › Nagasaki, Japan