The best times to visit Isahaya 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.
Isahaya Travel Guide
Other Isahaya Travel Info
Weather in Isahaya
Average temperatures in Isahaya 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 Isahaya, 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.
Isahaya Temperatures (Fahrenheit)
Isahaya Temperatures (Celsius)
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.
Isahaya Perceived Temperature (F)
Isahaya Perceived Temperature (C)
Average Isahaya 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.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Isahaya 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 Isahaya? 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 Isahaya.
Snow on the Ground
The graph below shows the average snow on the ground in Isahaya (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Isahaya 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 Isahaya 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 Isahaya.
The graph below shows wind speed (max and average) in knots.
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|
Is it Safe to Travel to Isahaya?
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 Isahaya, 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 Isahaya 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
Overall Isahaya 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 Isahaya, 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 Isahaya 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.