How to read a weather forecast

The app said a chance of rain. You left the umbrella at home because a chance is not a promise. Then it poured. The forecast was not wrong. It was telling you something you read differently, and once you know the language, the same screen plans your day.

The key numbers on a forecast and what they mean, then weather apps. Apps take their data from different weather models and services, so two apps can disagree. For storms, floods and heat, follow the official warnings from your national weather service.

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Ranked by visit traffic and sponsorship on Censuus, not editorial opinion. The list changes as new apps appear and gain traffic.

Chance of rain is about likelihood

A chance of rain says how likely it is that rain falls where you are during that time, not how much falls or for how long. Look at the hourly view to see when it is likely and the amount to see how heavy.

Dress for feels like

Wind and humidity change how cold or hot it feels. On a windy winter day the feels-like value is the one your fingers will notice. Check the air too; see how to check air quality before going outside.

Trust tomorrow more than next week

Forecasts are more reliable for the next day or two than for the days after. Plan the outline of a trip on a long-range forecast and check again the day before.

Pick an app you can read

Some apps show radar and hourly charts, others keep it simple. Compare them in weather apps. Surfers and sailors read a different kind of forecast; see how to read a surf forecast.

Compared from each developer’s own store description.
What you see	What it means	What you do
Chance of rain	how likely rain is at your spot	pack for it if it matters
Feels like	temperature with wind and humidity	dress for this one
Wind and gusts	steady wind vs short bursts	gusts matter for bikes
Hourly view	when, not just whether	time your errands
Days ahead	less certain further out	check again closer

Frequently asked questions

What does chance of rain mean?

How likely it is that rain falls at your location during that period. It does not say how much or how long.

Why do weather apps disagree?

They draw on different weather models and services. Compare the hourly view and follow official warnings.

How far ahead can I trust a forecast?

The next day or two is far more reliable than a week ahead. Check again as the day gets closer.