Is Apple Weather Accurate? Here Is the Honest Answer

Short version: Apple Weather is about as accurate as the forecast models feeding it, which means it is usually fine and occasionally wrong for reasons that have nothing to do with Apple. The more useful question is not "is it accurate" but "why does it never tell you how confident it is." That gap is the whole story.

Apple Weather does not make its own forecast

This is the part most people miss. Apple does not run a weather model. When you open the Weather app on an iPhone, you are not looking at an "Apple forecast" in the way you might look at a NOAA or Met Office forecast. You are looking at data that Apple has pulled in from national weather services and blended together.

Apple's own WeatherKit data-source attribution page lists exactly who does the actual forecasting. The underlying weather models come from the National Weather Service and NOAA in the United States, the European Centre for Medium-Range Weather Forecasts (ECMWF) via the UK Met Office, Environment and Climate Change Canada, Germany's Deutscher Wetterdienst, the Japan Meteorological Agency, and Meteo-France. Radar and station observations come mostly from NOAA, the Met Office, and the Japan Meteorological Agency.

In other words, the same public models that power dozens of other weather apps are what power Apple Weather too. Apple's contribution is aggregation and blending, deciding which source to lean on for your specific location and hour, then presenting it in a clean interface. So Apple Weather's accuracy equals the accuracy of those models, plus whatever Apple's blending adds or loses along the way.

That has a practical consequence. If ECMWF and the American GFS model disagree about tomorrow's rain, Apple has to pick a number to show you. You never see that the two best forecasting systems on Earth are arguing. You just see "60 percent."

Where Apple Weather came from: the Dark Sky story

Apple bought Dark Sky in March 2020. Dark Sky was famous for one thing: hyperlocal, down-to-the-minute "it will start raining in 12 minutes" nowcasting. Apple folded that technology into the built-in Weather app and, at WWDC 2022, launched WeatherKit as the developer replacement for the old Dark Sky API.

Then Apple shut the old product down. The Dark Sky app stopped working on January 1, 2023, and the Dark Sky API was retired on March 31, 2023. A lot of "why is Apple Weather worse than it used to be" complaints trace back to this transition. People who loved the precise Dark Sky nowcast noticed the built-in Apple experience did not always feel as sharp, and third-party apps that had been built on Dark Sky's data had to be rebuilt on WeatherKit or moved elsewhere.

Why Apple Weather is sometimes wrong (or feels worse)

A few honest reasons, none of them a conspiracy:

• Hyperlocal nowcasting is genuinely hard. The "rain in 12 minutes" style prediction relies on extrapolating radar forward a short time. It is impressive when it works and obviously wrong when a shower forms or dies right over your head. This is a limitation of the technique, not just of Apple.
• The underlying models can be off. When the source models blow a forecast, Apple blows it too, because it is downstream of them. No amount of interface polish fixes a bad model run.
• It shows one number and hides the disagreement. This is the big one. A single "20 percent chance" or a single temperature hides how much the models actually agree. A 20 percent that every model agrees on is very different from a 20 percent that is really a coin-flip between two model runs, but the app presents them identically.
• The Dark Sky transition reset expectations. If your mental benchmark is peak Dark Sky, the blended WeatherKit experience can feel like a downgrade even when it is objectively competitive.

What independent testing actually found

We will not invent accuracy percentages, so here is a real study you can check. In late 2024 the UK consumer group Which? worked with meteorologists at the University of Reading to score major weather apps over a two-week period, penalizing each wrong weather symbol and each degree of temperature error. Overall, The Weather Channel came first, followed by AccuWeather, the Met Office, then Apple Weather, with BBC Weather last. But the ranking flipped depending on the forecast horizon: for short-term forecasts around seven hours out, the Met Office led and Apple Weather came second, ahead of The Weather Channel and AccuWeather.

The takeaway is not "Apple is bad." It is that no single app wins at everything, and that a two-week test in one country is a snapshot, not a verdict. Rankings move with the weather, the region, and the time horizon.

The honest verdict

Apple Weather is fine. It is only ever as good as the models underneath it, and it is genuinely convenient. The real problem is not accuracy, it is that it never shows you the uncertainty.

When every model agrees, any decent app including Apple's will look accurate. When the models disagree, the honest answer is "we are not sure," and that is precisely the moment Apple Weather is least willing to admit it. It gives you a confident single number when it should be waving a flag.

How to sanity-check any weather app, including Apple

You do not need to abandon Apple Weather. You need a second opinion when the stakes are high (an outdoor event, a flight, a storm). Here is the quick method:

• Compare the models, not just the apps. Look at what the underlying models (like the American GFS and European ECMWF) say side by side. If they agree, trust the forecast. If they diverge, treat any single number with suspicion. That is exactly what compare US forecasts is built to show you.
• Watch for disagreement, not just the headline number. A 40 percent chance of rain means something very different when the models are split versus when they all point the same way.
• Trust nowcasts less the further out they go. Minute-by-minute rain timing is a best guess about the next hour, not a promise. Re-check it closer to the time.
• Match the app to the task. No app wins everywhere, so if you care about accuracy, see how the major sources stack up on which US forecast is most accurate before you rely on one.

Apple Weather is a perfectly reasonable default. Just remember you are looking at a blend of other people's forecasts, condensed into one confident-looking number, with the disagreement quietly removed. When that disagreement matters, go look at it directly.