Biking in Singapore's humid heat does not sound pleasant at all.
I cycled every day for a month along a mix of park connectors (cycle paths) and two and three lane roads.
I only had one close pass from a car because on nearly all roads they have a whole extra lane to use to pass you in so if you ride assertively (in the middle of a lane) they just go around you.
And the park connectors are beautiful, fast tarmac with no cars at all. With some creativity you can link them up to create a great commute to most places. My route home went past a Riverside pub - I was on segregated cycle lanes the rest of the way home so I could easily stop for a beer with little risk.
You do usually arrive soaking wet from sweat or the rain. But that's a minor inconvenience compared to being cold! Biking in Singapore is warm, fast, and safe - much better than most places I've commuted.
And no one seemed to mention...two wheeled transport is great, until it rains. And if you have never been to Singapore, Malaysia or the tropics you haven't seen real rain yet.
BTW...in SE Asia, the two wheeled transport of choice is the motorbike. The roads (and motorists attitudes) weren't designed for LOW speed traffic.
I cycle year round in London and would rather cycle commute in Singapore. Once you are acclimatised to the humidity it's not that big a deal, and it's always similar so it's easy to plan for.
You do have to pull off the road to wait out a real tropical rain storm... but so do motorbikes. That's why they have shelters for then under the today bridges.
All these places are ace compared to most US cities, though.
- warm: Sure, no argument here. Very warm..
- fast: No. Maybe. Let's hope that you don't ignore traffic lights: There are so many places that don't even care about bikes (underpasses/overpasses exist, but are hard to reach or less friendly to bikes by requiring you to ... wait for an elevator). You can understand the layout of the city, start riding and you will end up stranded. You will need to backtrack. The city hates bikes.
- safe: Yeah ... No. Singapore is not insane, but it's crazy enough. People don't understand turning signals. Drivers instead like to push into the direction they want to go, expecting everyone around them to follow along. This is, with no pun, in traffic terms a Little India.
I personally am fine to drive a bike here and being a nuisance, but most people don't do that. Literally everyone on the road is an asshole, some of these assholes drive Ferrari, Maserati, Lamborghini or whatnot. You do NOT want to scratch those stupid idiot's cars with your bike.
Traffic in Singapore is a huge and utter mess. Do not ride a bike here unless you're convinced that it's a good idea...
I cannot get to work via park connectors. Actually I probably have the 'best' way to work already: I'm already in CBD and the distance is small. But .. the city is not ready for bikes. Not at all. There are no bike lanes around my place. The one I found was about 200m long (yay!!) and used by pedestrians exclusively, every time I came there (yay!!!! I can try to ring my bell or push them over. That will help the bicycle community!).
Singapore is a great place. Singapore for bicycles sucks. Do not ride bikes here. Singapore doesn't care, they are not prepared and in general they offer no place to ride safely.