Diving in Cebu is good all year round. The visibility is not much affected by the seasons, ranging anywhere between 10m on a very bad day and 30+m on good days. So, in our opinion, we can not really recommend a special month where diving is best.
Cool & dry season (December to February) – Temperature in daytime is around 32C. Temperatures in night time drops to 23 – 25C. There are occasional rain showers. The water is a bit cooler, 26 – 27C.
Hot & dry season (March to May) – Temperature in daytime about 32C. It does not cool off very much in the evening; you can expect also 30 – 32C during most of the nights. The water is only a bit cooler, 27 – 29C. It rains very seldom, sometimes not in weeks.
Rainy season (June to November) – Temperature in daytime about 32C. Cebu and the Visayas have not a strong rainy season. Usually it’s bright sunshine in the morning and a short but strong and refreshing downpour in the afternoon. After that, sunshine again. Water temperature is 27 – 29C.
Between September and December the Philippines are sometimes hit by typhoons. These typhoons follow a regular path, which leads over the islands of Samar to Luzon ( Manila ) further on to China , Hong Kong or Japan . Cebu is outside this typhoon belt but sometimes we are affected by overcast and some rain for a couple of days.