When we moved to New Caledonia over a year ago, I could not believe our luck. Every morning, we woke up to sun and blue skies. I went swimming in September. Never was there a grey day. Here it is a year later, and we have gone from beautiful weather to even more beautiful weather (guidebooks say the best time to visit New Caledonia is September through November, but December was heavenly as well). In February and March it grew very hot (around 38°), rainy in April and May, cooler in June and July, a sunny August and now we are moving back into September. It will start getting warmer and warmer now and we will not see much rain. Like I said, I could not - and cannot - believe our luck!
As for sun, we basically have 12 hours of it a day. The sun rises around 6 and sets around 6. For an interesting graphic on our amount of daylight, see http://www.gaisma.com/en/location/noumea.html. You'll note that there isn't much variance: constant sunshine is the name of the day.