Singapore's weather has been providing us with marvellous glimpses of rather rare natural phenomenon lately.

And with Phase 1 of the country's reopening having just started on June 2, numerous people venturing out of their houses and returning to work have been treated to some pretty sights in the skies.

Rare clouds sighted once again

Several people have spotted fluffy iridescent clouds around Singapore, in the late afternoon of June 3.

This appears to be the second time the splotch of rainbow has been witnessed in two weeks.

The iridescent clouds were recently sighted in the East on May 27 at around the same time in the day.

Despite this frequency though, they are deemed to be rare, and are not seen often.

Here's what they look like today.

Clementi

Queenstown

Chua Chu Kang

Yishun

Iridescent clouds can be spotted when tiny ice crystals or water droplets diffract (bend) light, creating a rainbow-like effect in the clouds.

These usually appear behind altocumulus, cirrocumulus clouds, and lenticular clouds.

They are also more colloquially known as "fire rainbows" or "rainbow clouds".

The phenomenon typically accompanies thunderstorms, and appear in the late afternoon on particularly hot and humid days.

While it does not happen often, this is not the first time that cloud iridescence has been spotted in Singapore.

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Top photo by Gordon Wei Ye and Jalynn Woon