How to Read an Hourly Weather Forecast
The daily high is a summary of the warmest point. Your day is a string of hours, and most of them are not the high. An hourly timeline exists so you can match the weather to a time you already have: the school run, a shift, a game, the ride home. If you only remember the high, you will dress for a moment that may be hours after you are back indoors.
On this site the timeline marks selected hours from morning through late evening. Each mark has a time, a temperature, a condition, and a rain chance. You do not need to study every mark. You need the ones that overlap the hours you will be outside.
Start with your hour
Find that time first. Read its temperature, then the rain percent under it. If the percent is low and the temperature is close to what you are wearing, you are finished. If the percent is high, look at the marks before and after. A single wet mark between dry ones is a passing chance. A run of wet marks is a stretch, and you should plan for the stretch, not for a gap you hope appears.
Then look at the shape. Temperatures usually climb toward midafternoon and ease in the evening. If the line shows that curve, the day is behaving like a normal heating cycle. If it falls steadily from morning, cooler air is arriving and the advertised high may already be behind you. That pattern matters more than any single mark.
Skip hours you will not use
A forecast that includes late evening is not an assignment to worry about late evening if you will be indoors. Spend attention on the two or three times that change what you carry. Also skip false precision. An hourly value is a slice, not a promise that the temperature at 3:17 will match the 3 p.m. mark. If you need a short window, the nearest mark is the best public guide here, and it is still a guide. Leave a little room, especially for rain, which can start on either side of the hour.
The morning, afternoon, and evening rows compress those hours into a range, a condition, a rain chance, and a wind speed. Use the row when you want the block. Use the timeline when you want the clock. Mixing them up is how people cancel a dry morning because the daily rain chance looks busy.
A two-minute routine
Read the current temperature so you know the starting point. Move along the timeline to the hours you will be out. Note whether the rain chance rises or stays flat. Note whether the temperature climbs or drops. Then stop. An hourly forecast helps when it answers a timed question. Refreshing it without a question only produces new numbers.
Check once when you make the plan, and once more if the plan is still hours away and rain or wind was close to a cutoff you care about. The update time under the current reading tells you whether the page is fresh. A tab left open since morning is allowed to be stale.
Tomorrow's line on the page is a preview, not a second timeline. If your plan crosses midnight, use tomorrow's high, low, condition, and rain chance, then look again in the morning. Today’s hours stop being the right tool once today is over.