Like an unwanted hitchhiker; accompanying spring's warmer weather is a raft of rain and showers. Spring weather in Macau (March - May), can bring wonderfully warm days with clear blue skies, or it can bring apocalyptic downfalls, resulting in black rainstorm warnings. Try and check the weather ahead of time, where possible, to find a clear patch, if you're thinking of hitting Macau in spring.
Clothes
Goggles and a snorkel might be the best advice - but seriously some effective waterproofs are a must, as well as shorts and t-shirts for warmer days and sweaters for evenings.
Facts and Figures
Temperatures rocket through the spring, starting at around 20 (68) until they hit the 30s (86) towards summer. Rainfall is equally spectacular, with an average of 90-120mm through the season.

