The best times to visit Unzen for ideal weather are

May 7th to July 22nd

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



Other Unzen Travel Info

Weather in Unzen


Average temperatures in Unzen vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 28th 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 Unzen, 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 82.4°F (28°C) with temperatures rarely dropping below 69.5°F (20.8°C) at night.

Unzen Temperatures (Fahrenheit)


Unzen 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.

Unzen Perceived Temperature (F)


Unzen Perceived Temperature (C)



Average Unzen 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 42.3 35.9 28.9
Feb 46.6 39.4 31.4
Mar 52 44.3 35.9
Apr 60.3 52 43.1
May 69.1 60.5 51.6
Jun 72.2 66.4 60.9
Jul 78.3 72.5 67.5
Aug 80.9 74 68.6
Sep 76.5 68.9 62.4
Oct 67.9 59.7 52
Nov 56.9 49.6 42.3
Dec 45.7 39.3 32.4

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 5.7 2.2 -1.7
Feb 8.1 4.1 -0.3
Mar 11.1 6.8 2.2
Apr 15.7 11.1 6.2
May 20.6 15.8 10.9
Jun 22.3 19.1 16.1
Jul 25.7 22.5 19.7
Aug 27.2 23.3 20.3
Sep 24.7 20.5 16.9
Oct 19.9 15.4 11.1
Nov 13.8 9.8 5.7
Dec 7.6 4.1 0.2



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Unzen are October, January, and then November. 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 5 days of significant precipitation the week of June 18th.

When can you find snow in Unzen? 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 Unzen.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Unzen (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 3.4
Feb 31% 0 6.4
Mar 30% 0 9.1
Apr 32% 0 9.1
May 27% 0 9.5
Jun 53% 0 25.2
Jul 39% 0 18.9
Aug 34% 0 15.9
Sep 27% 0 7.5
Oct 16% 0 5.8
Nov 22% 0 4.9
Dec 25% 0 5.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 17 0 8.6
Feb 31 0 16.3
Mar 30 0 23.1
Apr 32 0 23.1
May 27 0 24.1
Jun 53 0 64
Jul 39 0 48
Aug 34 0 40.4
Sep 27 0 19.1
Oct 16 0 14.7
Nov 22 0 12.4
Dec 25 0 13.2


Humidity and Wind

Unzen has some extremely humid months, and above average humidity throughout the year. The least humid month is April (65.7% relative humidity), and the most humid month is July (88.4%).

Wind in Unzen is usually moderate. The windiest month is March, followed by July and April. March’s average wind speed of around 10.1 knots (11.6 MPH or 18.6 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid March where average top sustained speeds reach 18.5 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

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 9 Gentle breeze 15.1 Significant breeze
Feb 9.6 Gentle breeze 16.6 Significant breeze
Mar 10.1 Gentle breeze 17.3 Significant breeze
Apr 9.8 Gentle breeze 16.9 Significant breeze
May 8.9 Gentle breeze 15.5 Significant breeze
Jun 8.8 Gentle breeze 15.5 Significant breeze
Jul 10 Gentle breeze 16 Significant breeze
Aug 8.8 Gentle breeze 14.6 Significant breeze
Sep 8.2 Gentle breeze 14.7 Significant breeze
Oct 9 Gentle breeze 15.8 Significant breeze
Nov 8.7 Gentle breeze 15 Significant breeze
Dec 9.4 Gentle breeze 15.8 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 70.3%
Feb 70.5%
Mar 66.8%
Apr 65.7%
May 66.5%
Jun 85.7%
Jul 88.4%
Aug 84.4%
Sep 79.8%
Oct 72.2%
Nov 74.8%
Dec 73.7%


Is it Safe to Travel to Unzen?

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 Unzen, 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 Unzen 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 Unzen Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 71.1°F (21.7°C) and 47.5°F (8.6°C) with warmer temperatures in the later months. Rain is somewhat common with 8 to 10 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 comfortable. These months see the most precipitation with 11 to 16 days of precipitation per month. June – August is the busiest season for tourism in Unzen, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 78.4°F (25.8°C) and 52°F (11.1°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 5 to 8 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 Unzen to be enjoyable for warm weather travelers. The average high during this season is between 50.8°F (10.4°C) and 41.2°F (5.1°C). On average, it rains or snows a fair amount: 5 to 9 times per month. These times of year are the second busiest with tourists.


Best Times to TravelJapan › Unzen, Japan