" the most I ever saw in say SF was 5."

Really? London is 6 today, was 7 last week and 8 earlier this year.

I do also concur with the GP that Singapore is relatively mild as far as equatorial/tropical climates go. India, the Middle East, the Philippines and even Australia are sometimes much more oppressive.

The hottest day ever recorded in Singapore was 37c, whereas London is 38c and SF is apparently 41c. Of course, Singapore is more humid (and thus higher WBT) - but it's also much more consistent. In theory that would make it easier to acclimate..... but then Singaporeans seem to run their AC set to freezing.