We spent a year in FP and January to June mostly anchored in Opunohu Bay and off the Sofitel le Ora hotel
near Vaiare on Moorea. There summer, our winter is a bit wetter and hotter than the opposite season but not that much. It's warm all the time down there. Never felt the need for a jacket or any more clothes than our uniform, a pair of shorts and t-shirt. It was warm but boat was comfortable anchored out with an awning. If it got too hot, we just jumped in the water
. Papeete, on the other hand, where you tied med style to the quai and weren't oriented to the prevailing winds, was downright uncomfortable from midday through early evening.
We were in French Polynesia from June '76 to June '77 That was a weak El Nino period that lasted into '78. Did have a low front pass through that gave us strong winds and 2 days of a whole bunch of rain. We moved the boat around to Opunohu Bay when we heard it was coming and were snug and comfortable tucked way back near the head
of the bay. That was the only bad weather we had for the entire year and lasted only a couple of days. The following year, wasn't so lucky as Tahiti got hit by three severe storms, at least one of which was a full fledged hurricane. You do get passing tropical rain showers on a regular basis, however.