Hi June
I must agree with shelagh regarding the water temperature, it was very warm, indeed it was colder when we got out the water so we all ended going back in again.
Daytime temperatures
should be up in the mid - high 20's / low 30's however it will be cooler at night so you should take something like a light cardigan or shawl.
Be aware that it could rain

we went mid January and it had been raining for a few days prior to us landing and it rained our first night and was very overcast for 2 days before brightening and warming up.
I am led to believe that it also rained the week after we left.
Yes there could well be mozzies, several people were bitten with them.
Graham