The best time to visit Macau largely depends on what you're interested in and your tolerance for different weather conditions.
However, in general, the most pleasant time to visit Macau is in the autumn (October to December) when the weather is sunny and warm, and the humidity levels are relatively low. The skies are generally clear, allowing for good views from various landmarks.
Spring (March to May) can also be a good time to visit. The weather is warmer than in winter, but cooler and less humid than in the summer, with average temperatures ranging from 20°C to 25°C (68°F to 77°F). The risk of typhoons is also low during this season.
If you're visiting Macau for a particular event, you might want to align your visit with the Macau Grand Prix (generally mid-November), the Macau Arts Festival (May), or the Chinese New Year (date varies but usually in January or February), all of which offer unique cultural experiences.
The summer months (June to September) in Macau are typically hot and humid, with a higher chance of rainfall and typhoons. If you're not comfortable in humid weather or prefer to avoid the risk of typhoons, you might want to avoid this period.
As always, due to changes in climate and unpredictable weather events, it's always good to check the forecast and any travel advisories before booking your trip.