Is it advisable to start investing $100/month in STI ETF via POSB Invest Saver now, considering the impending recession?

I would recommend to think ultra-longterm, so even a 'current recession' (?) is

not an argument to not being invested.

However Singapore is a small market, when the U.S. stock market is the most important

one as also the most successful one. For Singapore maybe the S-REIT sector is more

interesting, and because of it's true singapore focus, the best ETF to me seems Lion-Phillip S-REIT ETF.

For U.S. investing SP500 index with ETFs: VOO or IVV are decent choices, very successful in the past.

For the last 10 years STI was an underperformer (see the chart).

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There is never a perfect time to invest. The best time is now.

No one will know exactly when the market will go down. So the best is to stay invested and stick to your investment strategy and rebalance your portfolio accordingly.

You may also want to keep a “war chest” to put in more monies when you think the opportunity has arrive.

Also good to seek professional advice when you are unsure too