This also has something to do with Singapore's geographical location as it is in an equatorial region surrounded by the South China Sea. Therefore, there often is a high level of humidity and high cloud cover. Occasionally, the haze from the forest fires in Sumatra may have much effects on the seeing in Singapore. One method is to wait till there is a heavy thunderstorm to "clear the air" of the haze.

Venus at sunset over Gold Coast, Australia, where the sky is much clearer and less often obstructed by clouds than in Singapore

From past experiences, a number of Singapore astronomers commented that seeing is better in the morning than at night. One probable reason is because the cold front sets in after midnight and the air becomes clearer. Some even hope the blue sky would continue till the night when they wake up in the morning. As the saying goes "whethering the weather", one has to debate the condition of the weather constantly since it is so erratic.

Singapore Skies | Sky Conditions | Light Pollution