Will any chance you can hold off the rain until Monday.
From
http://www.metservice.com/towns-cities/napier
Friday 11 Dec
Max 25°C
MIN 16°C
Fine with afternoon sea breezes.
Saturday 12 Dec
Max 25°C
MIN 16°C
Cloudy, with showers from early in the evening. Not much wind.
Sunday 13 Dec
Cloudy
Max 24°C
MIN 15°C
Cloudy. Westerlies.