"As we get northwesterlies ahead of a system, it really starts to warm up on Thursday as we're in that warmer air mass," Adams said. "But that unfortunately that also brings the rain."
The system in the Tasman is likely to produce scattered showers across Napier and Hastings on Wednesday, before slowly clearing on Thursday and Friday.
"The rain will get a bit heavier on Thursday, before it clears out on Friday for another nice weekend," Adams added.
Highs of 19C are expected in Hastings and Napier across Saturday and Sunday.