It will mean temperatures start to cool by tonight, with an overnight temperature of 13C in Napier, Hastings and Wairoa and an even cooler 11C in Waipukurau.
Tomorrow, Napier and Hastings will be 20C and Wairoa and Waipukurau 17C.
The region can expect cloud, and morning showers are possible in coastal areas on Saturday before fine spells in the afternoon.
The cooler temperatures continue throughout the weekend: low teens for Napier and Hastings and upper teens for Waipukurau and Wairoa.
Meanwhile, because of ongoing high water use throughout January and "prolonged hot, dry weather", Hastings District Council has introduced level 4 water restrictions in Waimārama.
The council's three waters manager Brett Chapman said the level 4 restriction meant a total ban on sprinklers and hoses for all homes within the Waimārama township that are connected to the public water supply.
"Springs are the main source of water and have come under pressure over the busy summer. We are implementing the restrictions to ensure the supply does not exceed Hawke's Bay Regional Council regulations which limit the amount of water council can draw to maintain reservoir levels."
The council is urging Waimārama residents and visitors to use water for domestic purposes only, and to save water. He said staff would be doing daily surveillance to ensure residents are complying with restrictions.
"A strict irrigation ban is in place under level 4, which includes watering gardens and lawns, [and] we will extend this to the washing of boats if there are indications that reductions in use are not sufficient. The irrigation ban applies to all users regardless of whether they are metered or not."
The remainder of the Hastings district is at level 2 water restrictions, which mean hoses and sprinklers can only be used between 6am and 8am and 7pm to 9pm every second day – on odd days at odd-numbered homes and on even days at even-numbered homes.
A step up from level 2 to level 3, may be instigated across all Hastings District Council supplies if more is not done to conserve water during the dry months ahead.
The council has changed the watering programme for its parks and gardens to ensure that council operations "play their part" in reducing community consumption.
