Best beach day this week for kids: how to pick it

A beach day with children is decided by four things a weather app's sun icon does not show: wind, UV, the tide, and the nap. Here is how to read each one, and how to pick the day of the week that gets them all right.

Updated 16 September 2026.

Start with wind, not sun

The single most common reason a family beach day fails is wind. Fifteen miles an hour is a pleasant breeze on a pier and a sandblasting on a towel at knee height, which is where a toddler lives. Sand in the sandwiches, sand in the eyes, a windbreak that will not stay up. For small children, look for sustained wind under 10 mph and gusts under 15; under 8 is a calm day. Onshore wind is cooler and rougher than the forecast reads; offshore is warmer and flatter but pushes inflatables out to sea, so nothing that floats leaves an adult's hand.

Then UV, by the hour

The UV Index is a forecast of its own, and it peaks in the middle of the day whether or not the sun is out. The US EPA's scale runs from 1 to 11+; in its words, at 1–2: Low, No protection needed; at 3–7: Moderate to High, Protection needed. Seek shade during late morning through mid-afternoon; and at 8+: Very High to Extreme, Extra protection needed. Be careful outside, especially during late morning through mid-afternoon. EPA, UV Index Scale.

For children, that turns into a plan rather than a warning: a summer beach day is a morning (arrive at nine, leave by half past twelve) or a late afternoon (arrive after four), with the middle of the day somewhere shaded. A day whose UV forecast stays at 5 or below all afternoon — spring, autumn, a hazy day — is the rarer, better kind: the whole day is usable. When you compare two days in a week, the one with the lower midday UV is often the better family day even if it is a degree cooler.

The tide decides how much beach there is

At high tide some beaches have no sand at all; at low tide the same beach has rock pools, firm sand for running and shallow warm water where the sea has come in over hot sand. For children, a falling tide through the morning, with low water around lunchtime, is the ideal: the beach grows while you are on it and the paddling stays shallow. Tide tables are published free for every named beach by national hydrographic services and harbour authorities; look yours up once a season and note the pattern, because low tide moves later by roughly fifty minutes a day.

The nap is a weather window too

If someone in the party still naps, the beach day has a shape already: arrive after the morning nap or leave before the afternoon one, and the good weather has to fall inside those hours to count. This is the part most forecasts cannot help with, because they tell you about the day and you need to know about ten until one. It is also exactly the reason Perfect Day judges hours, not days: tell it the window that works for your family, and it only calls a day good if the hours inside that window pass.

Temperature and the number behind it

The thermometer matters less at the beach than anywhere else, because the sea and the wind set how it feels. Still: for children in and out of the water, air temperature 72° to 88° is the comfortable range, and dew point under 65° is what keeps 85° feeling like a beach day rather than a wet blanket. A 78° day with a 70° dew point is stickier than an 86° day with a 58° one.

Putting it together: how to pick the day

1. A week out, see which days look dry and settled. Rule out any day with rain chance over 20% across your window.
2. Of those, pick the calmest. Wind under 10 mph beats two degrees warmer every time.
3. Check UV for your hours. If your window is the middle of the day, prefer the day whose peak is lower; if it is morning or late afternoon, UV matters less.
4. Check the tide for that day. Falling through the morning, low around lunch, is the one to want.
5. The night before, confirm the hours, and if the good ones have shifted, shift with them.

Or describe that once — the wind, the UV, the temperatures, the hours that fit around the nap — and let Perfect Day watch the week for you. It cannot read the tide table, but it can tell you which day is worth reading it for.