The best times to visit Koya for ideal weather are

April 9th to June 17th

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

 

 


Other Koya Travel Info

Weather in Koya

Temperature

Average temperatures in Koya 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 fair chance of precipitation about half of the year. The area is less temperate than some — in the 32nd 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 Koya, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally mid August where highs are regularly around 91.8°F (33.2°C) with temperatures rarely dropping below 77.7°F (25.4°C) at night.

Koya Temperatures (Fahrenheit)

Key
High
Average
Low

Koya Temperatures (Celsius)

Key
High
Average
Low

“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.

Koya Perceived Temperature (F)

Key
High
Average
Low

Koya Perceived Temperature (C)

Key
High
Average
Low

 

Average Koya 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 48.9 42.7 35.5
Feb 51 44.3 36.6
Mar 57.4 50.1 41.1
Apr 66.6 58.5 49
May 75.6 67.3 58.5
Jun 80.5 73.9 67.8
Jul 87.7 80.9 75
Aug 90.5 83.1 76.7
Sep 84.3 76.8 69.7
Oct 74.2 66.9 59.2
Nov 63.5 56.6 49
Dec 53.8 47.3 40.1

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 9.4 5.9 1.9
Feb 10.6 6.8 2.6
Mar 14.1 10.1 5.1
Apr 19.2 14.7 9.4
May 24.2 19.6 14.7
Jun 26.9 23.3 19.9
Jul 30.9 27.2 23.9
Aug 32.5 28.4 24.8
Sep 29.1 24.9 20.9
Oct 23.4 19.4 15.1
Nov 17.5 13.7 9.4
Dec 12.1 8.5 4.5

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Koya are January, December, and then August. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early January. For example, on the week of January 1st there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early July with an average of 3 days of significant precipitation the week of July 2nd.

When can you find snow in Koya? Weather stations report a bit of annual snow likely to be deepest around February, especially close to early to mid February. The best time to ski (if at all) in Koya is often around around February 12th when fresh powder is deepest. 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 Koya.

Key
Days with precipitation

Snow on the Ground

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

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 12% 0.4 1.9
Feb 22% 1.2 2.8
Mar 24% 0 4.6
Apr 22% 0 3.5
May 20% 0 4.9
Jun 28% 0 7.2
Jul 28% 0 7.4
Aug 18% 0 4
Sep 22% 0 6.1
Oct 24% 0 6.5
Nov 19% 0 4.6
Dec 16% 0 3.1

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 12 1 4.8
Feb 22 3 7.1
Mar 24 0 11.7
Apr 22 0 8.9
May 20 0 12.4
Jun 28 0 18.3
Jul 28 0 18.8
Aug 18 0 10.2
Sep 22 0 15.5
Oct 24 0 16.5
Nov 19 0 11.7
Dec 16 0 7.9

 

Humidity and Wind

Koya has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is March (48% relative humidity), and the most humid month is July (66.3%).

Wind in Koya is usually moderate. The windiest month is December, followed by March and January. December’s average wind speed of around 8.3 knots (9.6 MPH or 15.5 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 July where average top sustained speeds reach 15.9 knots, which is considered a moderate breeze.

Relative Humidity (%)

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

Key
Avg. Relative Humidity

Wind

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

Key
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 7.9 Gentle breeze 13.7 Significant breeze
Feb 7.8 Gentle breeze 13.5 Significant breeze
Mar 8.1 Gentle breeze 14.5 Significant breeze
Apr 7.7 Gentle breeze 13.8 Significant breeze
May 7.4 Gentle breeze 13.7 Significant breeze
Jun 6.5 Light breeze 12.3 Significant breeze
Jul 7.3 Gentle breeze 13.7 Significant breeze
Aug 7 Gentle breeze 13 Significant breeze
Sep 6.7 Light breeze 11.9 Significant breeze
Oct 6.8 Light breeze 11.8 Significant breeze
Nov 7.2 Gentle breeze 12.6 Significant breeze
Dec 8.3 Gentle breeze 14.2 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 48.2%
Feb 49.1%
Mar 48%
Apr 49.1%
May 52.6%
Jun 64.3%
Jul 66.3%
Aug 62.7%
Sep 60.3%
Oct 57%
Nov 56%
Dec 51%

 

Is it Safe to Travel to Koya?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for Japan; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Nov 14, 2023.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Koya, Japan is May, followed by October and March. 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 Koya in July. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
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 82.7 in July means 82.7% of the tourists vs. May.

 

 

Overall Koya Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 77.8°F (25.4°C) and 54.1°F (12.3°C) with warmer temperatures in the later months. Rain is somewhat common with 6 to 8 days of significant precipitation per month. Spring is the busiest for tourism, which makes it a good time for those looking for things to do.

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 5 to 9 days of precipitation per month. June – August is fairly slow season for tourism in Koya, so lodging and other accommodations may cost slightly less.

Fall (September through November)

Fall daily highs range from 86.9°F (30.5°C) and 59.8°F (15.4°C), which will feel very nice given the humidity and wind. It rains or snows a significant amount: 6 to 7 days per month. Tourism is the second busiest during these months due to the weather, so hotels may be slightly higher priced.

Winter (December through February)

Weather is too cold this time of year in Koya to be enjoyable for warm weather travelers. The average high during this season is between 55.8°F (13.2°C) and 48.4°F (9.1°C). On average, it rains or snows a fair amount: 4 to 6 times per month. These times of year are the slowest with tourists.

 

Best Times to Travel› Japan › Koya, Japan