How to read an hour-by-hour weather graph
Read a weather graph from left to right, combine only the layers that affect your decision, and find the hours when conditions work for you.
Read the guideWeathergraph guides
Understand the forecast. Find the useful hours.
Weather is easier to use when every number answers a question. These guides explain the graph, the source, and the uncertainty—then help you turn them into a plan.
Dew point vs. humidity: how muggy will it feel?
Dew point gives a steadier read of moisture in the air than relative humidity. Learn how to use it to plan a hot day, without mistaking it for a heat-safety rating.
Read the guideApple Watch weather complications: choose a useful glance
Choose an Apple Watch weather complication around the decision you make most often, understand how updates work, and know when stale data needs attention.
Read the guideWhy weather forecasts disagree—and how to choose a source
Weather apps can disagree because they begin with different observations, models, update cycles, and processing. Compare sources against the weather decisions that matter where you live.
Read the guideNowcast vs. radar vs. hourly forecast: what is the difference?
Radar shows recent precipitation, nowcasting projects the immediate future, and an hourly model forecast looks farther ahead. Use each for the question it can answer.
Read the guideWeathergraph: the whole forecast at a glance
See hours and days as one visual timeline, keep the forecast close on iPhone and Apple Watch, and choose the detail and sources that matter to you.
Read the guideWhat "feels like" temperature actually measures
Feels-like is a measure of you, not the air. Your body sheds heat constantly; wind carries that heat away faster, and humidity stops sweat evaporating. That is why the same reading can feel completely different on two days.
Read the guideWhy clear, calm nights so often end in fog
Fog is a cloud that forms where it stands. On a clear, still night the ground radiates heat to space, the air just above it cools to its dew point, and the moisture it was holding condenses in place.
Read the guideWhy next week's forecast keeps changing
Tiny errors in today's measurements grow fast in a swirling atmosphere. Forecasters run the same forecast many times from slightly different starting points—the runs agree for a day or two, then fan apart.
Read the guideWind gusts vs average wind: which number ruins your afternoon
A wind speed is an average over minutes; a gust is a brief peak that can be far stronger. Umbrellas, bikes and picnic blankets fail at the peaks, which is why a mild-looking wind forecast can still spoil an afternoon.
Read the guide
Weathergraph
Keep the whole forecast understandable
Weathergraph puts temperature, rain, wind, sunshine, clouds, dew point, and more on one hourly timeline—so you can use what you learned here when it is time to make a plan.
