Lifeguard Staffing Forecast: Weather and Pool Crowds

Use the weather, holidays and your past hourly counts to estimate how busy each hour will be, then check that guess against your staffing plan: every open zone covered, rotations, breaks and backup. The crowd number helps you plan, but under the CDC's model code the number of zones, not the number of swimmers, sets the floor.

What sets the minimum number of guards?

The CDC's 2024 Model Aquatic Health Code (MAHC) builds staffing around zones (check what your state adopted). The rules say:

• Each guard must be able to see their whole zone and reach its farthest point within 20 seconds (section 6.3.3.1.1).
• Every part of every pool must be in a zone (section 6.3.3.1.1).
• No guard watches swimmers for more than 60 minutes in a row. A change can be a move to another zone, or at least 10 minutes off watching, such as a break (sections 6.3.3.1.2 and 6.3.3.1.3).
• The zone must stay covered while guards change (section 6.3.3.1.2).
• A facility with a single zone must have at least 2 qualified guards present (section 6.3.4.3.1).
• All zones must be staffed while open, and rotations must happen while all zones are staffed (section 6.3.4.3.1).
• Guards watching swimmers must not get other tasks that get in the way (section 6.3.4.3.4).

The MAHC also lists failing to staff the pool as required, and having more swimmers than the pool's set maximum swimmer load, as imminent health hazards (section 6.6.3.1).

Our guide to how many lifeguards a pool needs covers this in more detail.

How do weather and holidays change crowds?

Look at your own records. Ask whether hot afternoons, school breaks or holidays brought bigger crowds at your pool. Treat each as a pattern to check, not a sure thing.

The CDC's guide to operating public pools notes that weekends are when pools are used most. It says to make sure trained staff are there then.

For each hour, record:

• Swimmers in the water, counted the same way each time.
• Weather, and any closure.
• Lessons, bookings, holidays or events.
• Which areas were open and who guarded them.
• Any missing counts.

How do you make a simple hourly crowd estimate?

Say an outdoor pool counted 40, 50 and 60 swimmers at 2 p.m. on three hot Saturdays:

• 40 + 50 + 60 = 150
• 150 ÷ 3 = 50 swimmers on average
• Range: 40 to 60

Plan for the range, not just 50.

Poolean makes hourly swimmer forecasts for each pool. To check one against your counts: pick past days like the one you are planning, use the same hour, add the counts, divide, and note the lowest and highest. Repeat for each hour.

How do you turn the estimate into guard assignments?

Start from zones, then add people for rotations and other roles. Here is a template for an example pool that opens a third zone when crowds pass a level its plan sets:

Hour	Expected swimmers	Zones open	Guards on stands	Rotation/break guard	Other roles in your plan
12-1	15-25	2	2	1	Supervisor, if required
2-3	40-60	3	3	1	Supervisor, if required
5-6	20-30	2	2	1	Supervisor, if required

In this example, the 2-3 p.m. hour needs 3 guards on stands plus 1 rotating guard, so 4 guards in those roles. The rotating guard lets each guard move or take a break before 60 minutes, without leaving a zone empty. Your site's plan sets the real numbers.

Before approving the roster, check:

• Every open zone has a qualified guard.
• Each guard gets a change within 60 minutes.
• Zones stay covered during changes.
• Nobody watching the water also has to do another job.
• Each person's certification is current. See our weekly lifeguard schedule guide.

What changes when storms are possible?

A storm forecast can lower the crowd guess, but it can also add work. The National Weather Service's lightning safety page says organizers should check the latest forecast before an event and have a written lightning safety plan. It says to wait at least 30 minutes after the last thunder before going back outside. If you hear thunder again, the 30 minutes start over.

The MAHC does not set a wait time. It asks every facility to have a plan for local weather like lightning and high winds, covering staff training, how to clear the area, and when it is acceptable to reopen (sections 6.3.4.5.9 and 6.3.4.5.9.1).

So before cutting shifts for a storm, check who will clear the pool, direct people to shelter and reopen. Follow your training and emergency plan, and call emergency services when needed. See our lightning closure policy guide.

How do you check the forecast during the day?

Compare expected and actual counts each hour, and check who has clocked in. Write down the gap and what the manager did. Give forecast checks to a manager or supervisor, not to a guard on the stand.

If actual crowds pass what your plan covers, follow the plan. That may mean adding a guard, opening fewer areas, or limiting entry.

Poolean's hourly swimmer forecasts use the weather, heat waves, holidays and past attendance, so you know how many guards each site needs. That forecast is a planning aid; your zone plan still sets the minimum. Its staffing view shows shifts, clock-ins and callouts, and records manager approvals of coverage requests. See the staffing features or book a 30-minute call.

The short version

• Estimate each hour from past counts on similar days, and keep the range.
• Under the 2024 MAHC, zones set the minimum, and no guard watches more than 60 minutes in a row.
• Add a rotating guard so zones stay covered during changes.
• A storm forecast does not remove the staff you need to clear and reopen.