Makgabutlane said the temperature was expected to be average for the time of year with a high of 18C and an overnight low of 12C.
“It will be cooler on Sunday with rain expected to last all day, accompanied by those strong westerly winds.
“The winds are expected to ease off at around 9pm on Sunday and the rain should ease to showers.”
A high of 17C is forecast for Sunday followed by an overnight low of 9C.
Makgabutlane said the recent rainfall recorded at Whanganui Airport was below average for the time of year.
“The average Whanganui rainfall for May is 87mm so that’s pretty good. Some regions such as Northland have recorded over three times their average for the month.”
Waka Kotahi NZ Transport Agency advises motorists to check the journey planner section of its website before heading out on the roads this weekend.