Wyong Shire Council has voted to trial seven-day-a week patrols at Soldiers and Shelly beaches during July, August and September.

Council's manager of customer and community services, Danielle Dickson, said head counts of swimmers at the beaches would be an important part of the trial.

"We're looking at capturing how many swimmers are swimming at the two beaches at hourly intervals, and the lifeguards will gather that data electronically through hand-held devices," Ms Dickson said.

Data on tidal and wave conditions would also be gathered.

It's all part of determining the "risk profile" at the beaches during the cooler months, and whether or not there was sufficient demand to warrant patrolling the beaches at that time of year.

The lifeguard patrol season concludes at the end of April, but May and June were not included in the trial period.

May and June were excluded from the trial because of annual leave and other scheduled works involving lifeguards at that time of year, and because of the need to get a spread of months that offered varying conditions, Ms Dickson said.

"July really is mid-winter whereas September is getting closer to warmer conditions when we would expect a lot more people to be on the beaches," Ms Dickson said. "July also captures the school holidays."

Educating residents and visitors to swim only at the two patrolled beaches from July to September looms as a challenge for the council.

The trial is expected to cost $170,000.

If the patrols are adopted annually, it would bring Wyong Shire into line with Local Government areas such as Newcastle, Manly and Wollongong which have lifeguard patrols between April and October.