The improving conditions forecast for today and the following two days will be welcomed by the setting-up teams.
The stage arrived direct from its last concert site in Rotorua last Thursday and the seven full-time crew and six local workers got to work on Friday - although Saturday was literally a washout as rain swept the site.
"But that's just the way it is. You can't do anything about the weather and there haven't been any real issues," Mr Kemble said.
The New Zealand-built stage, which has been used only three times previously and will be making its Mission debut, is slightly smaller than last year's, which is being set up in Auckland for the Eminem concert there.
The stage was brought to Napier aboard three 15-metre trucks.
It is the also first time Mr Kemble's company has been called in to set up the stage for the Mission and he was impressed with the site.
Several large tents had also gone up by late yesterday and portable toilets and generators were arriving on site.
The first of the Mission artists, ex-Spice Girl Mel C, is expected to be the first to arrive in the Bay, late tomorrow.
She will join the party-night line-up with Billy Ocean, Sharon Corr, Leo Sayer and Ronan Keating.