The best times to visit Iwamizawa for ideal weather are
May 21st to October 7th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Iwamizawa Travel Guide
Other Iwamizawa Travel Info
Weather in Iwamizawa
Average temperatures in Iwamizawa 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 24th 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 Iwamizawa, 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 82.9°F (28.3°C) with temperatures rarely dropping below 66.7°F (19.3°C) at night.
Iwamizawa Temperatures (Fahrenheit)
Iwamizawa 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.
Iwamizawa Perceived Temperature (F)
Iwamizawa Perceived Temperature (C)
Average Iwamizawa 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 Iwamizawa are June, April, and then July. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late June. For example, on the week of June 25th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid January with an average of 5 days of significant precipitation the week of January 8th.
When can you find snow in Iwamizawa? 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 Iwamizawa.
Snow on the Ground
The graph below shows the average snow on the ground in Iwamizawa (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
Iwamizawa has some very humid months, with other comfortably humid months. The least humid month is April (57.1% relative humidity), and the most humid month is July (75.8%).
Wind in Iwamizawa is usually calm. The windiest month is May, followed by April and March. May’s average wind speed of around 7.4 knots (8.5 MPH or 13.7 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 late April where average top sustained speeds reach 15.2 knots, which is considered a moderate breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Iwamizawa.
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||6.1||Light breeze||11.3||Significant breeze|
|Feb||6.6||Light breeze||12.2||Significant breeze|
|Mar||6.7||Light breeze||12.6||Significant breeze|
|Apr||7.2||Gentle breeze||13.6||Significant breeze|
|May||7.4||Gentle breeze||13.9||Significant breeze|
|Jun||6.1||Light breeze||11.5||Significant breeze|
|Jul||6.1||Light breeze||11.2||Significant breeze|
|Aug||6||Light breeze||11||Significant breeze|
|Sep||5.8||Light breeze||11.2||Significant breeze|
|Oct||6.4||Light breeze||11.8||Significant breeze|
|Nov||6.5||Light breeze||12.1||Significant breeze|
|Dec||6.5||Light breeze||11.9||Significant breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Iwamizawa?
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 Iwamizawa, Japan is January, followed by March and April. 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 Iwamizawa in December. 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 Iwamizawa Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 69.4°F (20.8°C) and 33.3°F (0.7°C) with far 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 comfortable. These months see the least precipitation with 5 to 8 days of precipitation per month. June – August is fairly slow season for tourism in Iwamizawa, so lodging and other accommodations may cost slightly less.
Fall (September through November)
Fall daily highs range from 77°F (25°C) and 39.6°F (4.2°C), which will feel chilly given the humidity and wind. It rains or snows a good amount: 10 to 11 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 far too cold this time of year in Iwamizawa to be enjoyable for warm weather travelers. The average high during this season is between 37.2°F (2.9°C) and 26.2°F (-3.2°C). On average, it rains or snows a very great amount: 11 to 16 times per month. These times of year are the second busiest with tourists.