"Then we get a westerly pushing through on Wednesday which really drops the temperatures so you're looking at highs of 19C on Wednesday and Thursday with some showers too.
"But it does clear up by the end of the week and starts to get warmer again."
Little said the rain over the coming days was expected to be more mild closer to the coast.
"Parts of the region will see very little. Particularly more inland, you're looking at 30mm or so.
"For particularly coastal parts of Whanganui, it's looking like it will remain quite dry and places that are lucky will get about 10mm or so."
Heading into the long weekend, Little said there would be some unsettled weather but for the most part it's fairly stable.
"Saturday isn't looking too bad with some westerlies and a few showers perhaps later in the day. It looks like there will be a weak front go across late on Saturday or early on Sunday.
"That'll likely bring a few showers with it, but they should clear on Sunday. It moves off quite quickly and we return to northwesterlies with fine weather prevailing on Monday."
Saturday and Sunday are looking at a high of 22C and 23C respectively, with Monday expected to reach 24C.