Iya Valley, Japan: What to pack, what to wear, and when to go [2021]

This article contains affiliate links to Amazon and other vendors. We may earn commission from purchases made through these links.

Traveling to Iya Valley, Japan? If you're planning to go to Iya Valley, here is some important information about when to go, what to wear, and what to pack:

When to go to Iya Valley, Japan

Based on the climate and weather in Iya Valley, the best time to go is August. See below for details.

What to wear/what to pack for Iya Valley, Japan by month

January

In January, Iya Valley is unbearably cold and somewhat rainy. Temperatures routinely are in the 20s F (single digits below 0 C) range. At night, lows are in the 10s F (single digits below 0 C).

This is also a rainy time for Iya Valley, with several of the days of the month having rain. In January, humidity reaches as high as 60%.

What to wear/what to pack:

February

If you go to Iya Valley in February, you will notice that it can be bitter cold and somewhat rainy. Expect it to rain about half of the time and snow once in a while.

Daytime temperatures are in the high 20s F (single digits below 0 C).

What to wear/what to pack:

March

Traveling to Iya Valley in March, you will notice that it can be extremely cold and very rainy. Expect it to rain about half of the time. Daytime temperatures are in the low 30s F (single digits C).

What to wear/what to pack:

April

In April, Iya Valley can be brisk and very rainy. Temperatures routinely are in the 40s F (single digits C) and 5-10 days this month jump into the low 70s F (low 20s C) range. At night, lows are in the low 30s F (single digits C).

This is also a rainy time for Iya Valley, with more than half of the days of the month having rain. In April, humidity reaches as high as 60%.

What to wear/what to pack:

May

May in Iya Valley is brisk and somewhat rainy. The rain can amount to several inches/centimeters. During this time, temperatures average in the low 50s F (low 10s C).

What to wear/what to pack:

June

June in Iya Valley can be chilly and very rainy. The rain can amount to several inches/centimeters. During this time, temperatures average in the low 50s F (low 10s C) to high 50s F (mid 10s C).

What to wear/what to pack:

July

July for Iya Valley is crisp and somewhat rainy. Temperatures average in the 60s F (high 10s C) during the day. It rains about half of the time.

What to wear/what to pack:

August

August can be chilly and somewhat rainy. Temperatures average in the 60s F (high 10s C) during the day. It rains about half of the time.

What to wear/what to pack:

September

September in Iya Valley is cool and very rainy. Temperatures average in the high 50s F (mid 10s C) during the day. It rains about half of the time.

What to wear/what to pack:

October

In October, Iya Valley is pretty cool and somewhat rainy. Temperatures routinely are in the low 50s F (single digits C) range. At night, lows are in the high 30s F (single digits C).

This is also a rainy time for Iya Valley, with several of the days of the month having rain. In October, humidity reaches as high as 60%.

What to wear/what to pack:

November

If you vacation in Iya Valley during November, you might see that it is brisk and somewhat rainy. Temperatures tend to hover around the low 40s F (single digits C) during the day, while at night they can dip into the low 30s F (single digits below 0 C).

Humidity is generally between 50 and 60% during the day. In terms of precipitation, you can expect it to rain about half of the time.

What to wear/what to pack:

December

In December, Iya Valley is frosty and somewhat rainy. Temperatures routinely are in the low 30s F (single digits C) range. At night, lows are in the high 10s F (single digits below 0 C).

This is also a rainy time for Iya Valley, with several of the days of the month having rain. In December, humidity reaches as high as 60%.

What to wear/what to pack:

Year-round what to wear/what to pack for Iya Valley, Japan

Here are some general tips on what to wear in Iya Valley, as well as several items to remember to pack when traveling there.

  • A plug adapter that supports outlet types A and B. This one works in most locations, but you may want to check with your hotel.
  • A SIM card that works in Iya Valley. A good global SIM card works in most countries, but check the country list before buying. In some locations you may need a satellite phone. We recommend this satellite phone
  • Appropriate museum wear
  • Bicycle friendly attire, if you plan on biking anywhere
  • Emergency water purifier

Check out our guides for these other locations: Western Mongolia, Mongolia, Takayama, Japan, Union, Connecticut, United States of America, Charleston, West Virginia, United States of America, Central Circuit, Japan, Milies, Greece, Alborz, Iran, Alona Beach, Philippines, Sucre, Venezuela, Lucens, Switzerland, and Provincetown, Massachusetts, United States of America.