For those not here, it's the wettest day for some months. Rick Breeze is showing 30mm of rain already today. I guess the "clear sky" bit means that the UV forecast has no weather input at all - e.g it will be "11 - Extreme" for all summer days no matter what happens with weather, volcanic eruptions or any other sun-attenuating events. Seems a bit pointless - they could just have a block reading:
Summer in New Zealand can often involve sunshine. You can detect this when you go outside and don't get wet. Hanging around in the sun too long can lead to sunburn. Wear sunblock. Or stay inside a movie theatre, underground carpark or shopping mall.