Whanganui will head into the weekend under clear skies and a high of 18C forecast for Saturday.
MetService meteorologist Kyle Lee said the forecast temperature was around 6C higher than average for this time of year.
"Sunday is looking good as well with a high of 17C and light winds although it is likely to be cloudy and there is a possibility of showers later in the day.
"The overnight lows will be quite mild as well with expectations of 6C on Saturday and 8C on Sunday."
The umbrellas will need to come out again on Monday, although northwesterly winds will keep the temperature warm with a high of 18C and an overnight low of 8C forecast.