If sentos are closing in inner cities because traditional houses are disappearing, then it will be doubly hard to find one offering lower temperature for pregnant ladies who still live in those few traditional houses? May be obasans?
In any case, using the search term "東京 微温泉", here is one in Nishi Shinjuku. Which should be close enough to where you will be and 25.9 deg C should be pretty cool.
http://www.juken-net.com/magajin/maga/79.htm
BTW, it seems this onsen is naturally at this temperature, not a consideration to pregnant clients.
Originally Posted by
LapLap
I'm not looking for just any exception.
I'm looking for somewhere with cooler sento because the normal ones are too hot for me and the little one to bathe in safely.
That's why pregnant women are advised not to use them. The 'slippery floor' bit has little to do with the real dangers of sento/onsen bathing.
Human body actually regulate internal temperature to a pretty constant level regardless of the ambient temperature. The temperature caution should be the fact that bather may be a little dizzy come out of the onsen after fighting the elevated temperature and not the fact that internal temperature is elevated. Only sick people have elevated internal temperature.
But I guess you are not concern with what other people are concerned about such as gems and slippery floors in onsen/sento.