A little of course, but not a whole lot. From today until june 11th, at least 5 days are expected to hit at least 90% humidity at some part of the day and 3 days are forecasted to have at least 94% humidity at some part of the day with a high of 96% humidity. Pretty close to 100 no? Of course it's not really everyday all day, but after growing up in the southeast USA, and very sensitive to humidity, my 5+ summers in Japan were def worse!

That's because it's supposed to rain... </facepalm>

Oh, and 90 miles is nearly 150 kilometers. Tokyo-Narita is not even half that -- it's not even 90 kilometers distant.

and summer is the rainy season... so rain most days means humidity most days. i never wrote anything about distance of nrt, that's another issue, but there is no denying that summers in Japan are very very humid, even when it is not raining!

Minor correction: Rainy season happens during the summer but for only a small part at the beginning. In Tokyo it is typically mid-June to 3rd week of July. After that, plenty of summer remains that is not rainy season.

Not sure i would consider 5 weeks a small part, after all if you are traveling to Japan in that time frame it could be 100% of your summer in Japan, but yes, 2/3 or so of summer that isn't the "rainy" season but it's hotter in those months and there is still a lot of rain, it's humid and hot in summers in Tokyo. Looking at the averages, there is usually more rain in August and even September than July.

Is anyone really trying to deny the fact that Tokyo is miserable in the summer in terms of heat and humidity? Especially since AC is used a lot less commonly and usually set at higher temperatures than what what is used in the states... I'd say it's a pretty safe bet that a traveler from the USA, even somebody from the south or Florida, would not find the heat and humidity nice during summers in Tokyo!

I prefer the rainy season over the sauna season. Avoid mid-July to mid-September unless you have a well air conditioned car or you're going to spend time in the mountains.

More rainfall in August and September than July but fewer rainy days.

Once I saw data that showed Tokyo as the most humid major Asian City in the summer. Anybody else seen this.

Most humid city in summer just doesn't sound quite right to me... but Tokyo certainly has a mad confluence of humidity, heat island and relatively formal dress code (although that has relaxed). If you're moving around a lot, that also adds to the discomfort. One of my colleagues from a car-centric city was particularly shocked when we had to navigate four or five flights of stairs on a blistering day - to exit subways, cross streets and so on.

Someone on FlyerTalk is asking that question?
kayak.com
hipmunk.com
bing.com/travel
And a billion others. Please spend at least 5 minutes doing some legwork on the Internet instead of asking everyone else here to do it for you.