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Explainer

How to Read Airport Weather Before You Fly

By The Flight Tracker Team · October 8, 2026

Airport weather is useful for predicting risk, not for predicting your delay. A forecast showing 45 km/h crosswinds, fog at dawn, or thunderstorms in the afternoon tells you the day has a good chance of running badly. It cannot tell you whether your specific flight will be late, because most of what turns weather into a delay happens in air traffic decisions you never see.

Read the weather to decide how much slack to build into your day. Read the flight status to find out what is actually happening.

What the weather in Flight Tracker is

Each airport page shows current conditions and a short forecast: temperature, wind speed, humidity, visibility, and pressure, sourced from Open-Meteo. It is a general-purpose meteorological forecast for the airport’s coordinates.

It is deliberately not an aviation weather product. Pilots and dispatchers use coded aviation observations and terminal forecasts written specifically for flight operations, with cloud bases, runway conditions, and change groups that a general forecast does not carry. What we show is the same class of data you would use to decide whether to take a coat — accurate for that job, and honest about not being a flight-planning tool. See our data sources for exactly which provider supplies what.

The four things that actually cause weather delays

Wind

Wind matters in two ways. Strong crosswinds reduce the number of usable runways and slow the rate at which aircraft can land, because controllers need bigger gaps between arrivals. Strong headwinds on approach do the same thing. An airport that normally lands 40 aircraft an hour might drop to 26, and every arrival after that queues.

Look at wind speed and direction together. A 40 km/h wind straight down the runway is far less disruptive than a 25 km/h wind across it.

Visibility

Low visibility from fog, heavy rain, snow, or smoke forces low-visibility procedures. Aircraft are spaced further apart, ground movements slow down, and airports that can normally use several runways in parallel lose that capacity. Fog is the classic morning delay generator: it clears by 10am and the airport spends until mid-afternoon catching up.

Thunderstorms

Convective weather is the biggest single cause of large-scale disruption. Storms close departure routes, force long detours, ground crews during lightning alerts, and — because storms move — invalidate the plan every 20 minutes. A single afternoon storm cell over a hub can push delays into the night across a whole continent.

Snow and ice

Freezing conditions add de-icing, which is a queue in itself. Each aircraft may need 10–25 minutes at a de-icing pad, and the treatment has a limited window before it must be repeated. Snow also means runway clearing, which takes capacity offline in blocks.

Why an airport can be sunny and still delayed

This is the most common source of confusion. Your airport looks perfect and your flight is two hours late. Any of these explains it:

Cause	What you would see locally
Weather at the other end of the route	Clear skies here, storms at the destination
Weather where the aircraft is coming from	Your inbound aircraft is stuck three airports back
Storms along the route, not at either airport	Perfect at both ends, long detours in between
Air traffic flow restrictions at a busy hub	Fine everywhere, but arrival slots are rationed
Crew delayed by an earlier weather event	No weather anywhere near you today

Weather delays follow aircraft and crews around the network for the rest of the day. The sky above you is only one input.

How to use the forecast practically

• Check both airports. Your departure airport and your arrival airport. If you have a connection, check the connecting airport too.
• Check the day, not the hour. If thunderstorms are forecast for the afternoon and you fly at 6pm, assume the airport is already behind.
• Treat fog and freezing temperatures as early-morning risks. They hit the first waves of departures hardest.
• Convert risk into slack, not panic. A risky forecast is a reason to choose an earlier connection, keep your bag as carry-on, or leave a longer transfer window — not a reason to assume cancellation.
• Then switch to status. Once the day starts, the flight’s own status, gate, and estimated times are far more informative than any forecast. The reasons flights get delayed go well beyond weather.

What the forecast will never tell you

It will not tell you whether your airline decided to cancel one of two frequencies to protect the rest of the schedule. It will not tell you about crew duty limits, a technical issue, or an air traffic flow restriction imposed 600 km away. Those are operational decisions, and they only become visible when the flight’s status changes.

So use weather as a planning input and flight status as your live source of truth. For anything time-critical — a tight connection, a rebooking decision, or leaving for the airport in bad conditions — confirm with your airline.

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