Checking wind and sun before you settle on the sand

Before you lay out a towel, check three things: which way the wind is blowing, where the sun will be over the next few hours, and what the sky and sea are doing. None of this needs instruments or a forecast app, although a forecast is a useful complement. A short walk along the sand and a minute of looking around will tell you most of what you need to decide whether a spot is worth settling into.

Working out the wind direction

Wind is easier to read than most people expect. Flags, banners and the poles of lifeguard stands show which way the air is moving. The surface of the sea shows the same thing, since wind creates small ripples and darker patches that drift across the water. On the beach itself, sand blowing across the surface, spray lifting off the tops of waves and grass bending on the dunes all point the same way. A breeze you can barely feel on your face can still lift a shade or blow a book off a towel, so judge the wind by its effect on your setup rather than by how strong it feels.

Stand where you plan to sit for a minute and notice where the wind is coming from. Wind off the sea brings salt spray and sand, so keep bags closed and food covered. Put the most solid side of your setup toward the wind, and keep the cooler on the sheltered side, where a gust is less likely to tip it.

Telling onshore from offshore

The direction of the wind matters for swimmers as much as for picnics. An onshore wind blows from the sea toward land and tends to push waves toward the beach. An offshore wind blows from land toward the sea, and it can make the water look calm near the shore while carrying floating objects farther out. A child on an inflatable or a swimmer who drifts beyond their depth can be taken offshore quickly, so check the wind before anyone uses a float, and keep inflatables out of the water when the wind is blowing away from the beach.

Many coastlines also get a sea breeze. In fine weather the land warms faster than the water, and cooler air moves in from the sea during the afternoon. A calm morning often turns breezy by midday or early afternoon, so if you plan to stay through lunch, set up shelter that will still work when the afternoon wind arrives.

Judging sun exposure over the day

The sun moves across the sky, so a shady spot at 9 a.m. may be fully exposed by early afternoon. Look for natural shade from dunes, cliffs, rocks and tall vegetation, and note where their shadows fall at the start of your visit. Shadows lengthen, shorten and shift direction as the day goes on, so the spot you choose needs to stay shaded for as long as you plan to stay.

Ultraviolet light is usually strongest around midday, and clouds reduce it without blocking it fully, so a cloudy beach can still burn. Sand and water reflect ultraviolet light, which means a spot near the water receives more exposure than the same spot inland. Check the UV index in a local forecast if one is available, and plan to spend the midday hours in shade where possible.

Reading the sky and sea

Clouds and thunder

Clouds tell you about change. Small, fair-weather cumulus clouds usually mean calm conditions. Towering clouds that grow taller through the afternoon can develop into thunderstorms, and dark, flat cloud bases, a sudden drop in temperature or a shift in wind direction are signs that conditions may be changing.

Thunder is the clearest signal. When you hear it, lightning is within reach. Leave the beach, move to a building or a hard-topped vehicle, and wait about 30 minutes after the last thunder before returning to the sand.

Surf and flags

Sea conditions matter as much as the sky. Look at the height of the waves, how close together they break and whether the surf has a steady rhythm or looks chaotic. Many beaches use a flag system to show hazard levels, with red for high hazard, yellow for medium and green for low, and purple in some places for dangerous marine life. Flag systems vary by country, so check the signs at the access point and ask a lifeguard if the system is unfamiliar.

If the waves are large, the water looks murky or the surf breaks close to shore, plan to stay out of the water and keep the setup well back from the tide line. Conditions can also change between morning and afternoon, so the check you made on arrival is not the last one you need.

Deciding whether to settle or move on

Make the call before you unpack. If the wind makes it hard to keep a towel down or a shade standing, move to a sheltered part of the beach, such as behind a dune or on the lee side of a rocky outcrop, and check again. If your chosen spot will lose its shade before you plan to leave, pick a spot that keeps shade later, or plan to move the setup. Check the tide table too, since a spot that is comfortable at low tide may be under water later.

If you hear thunder or the sky is building, leave. The beach will still be there later. A ten-minute check on arrival, covering wind direction, sun path, sky and sea, prevents most of the problems that send people home early. Repeat the check after lunch and before any long swim, because the wind and sun change through the day.