US Weather Forecast
See a public National Weather Service forecast for a US location.
Fetches public reference data on request
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What is the US Weather Forecast?
The US National Weather Service (NWS) publishes free, public forecasts for the whole country, but its data is organized around forecast offices and grid points rather than city names, which makes the raw API awkward to use. A quick, ad-free summary helps when planning travel, outdoor work, an event or a commute in a major US city.
This tool fetches the official NWS forecast for one of five preset cities: Chicago, New York, Los Angeles, Seattle and Miami. When you press Get forecast, the bytelyx server asks the NWS points API which forecast grid covers the city-center coordinates, then requests that grid's forecast and returns the next six forecast periods. Each period shows its name (such as Tonight or Wednesday), temperature in Fahrenheit, a short summary and the detailed text written by NWS forecasters, plus the time the forecast was last updated. It does not show watches, warnings or radar, so check weather.gov or local alerts when conditions are severe.
How to use it
- 1Choose a supported US city.
- 2Fetch the latest forecast.
- 3Review the forecast periods and check official alerts when needed.
How it works
The server uses the National Weather Service points API to discover a forecast endpoint for the selected coordinates, then caches forecast periods.
Example
Choose Chicago to see the latest available NWS forecast periods for its city-center coordinates.
Limitations & notes
- Coverage is limited to supported US locations.
- Forecasts can change and may be temporarily unavailable.
Frequently asked questions
How far ahead does this forecast go?
NWS forecasts are split into 12-hour day and night periods, and this tool shows the first six. That covers roughly the next three days, for example This Afternoon, Tonight, Thursday, Thursday Night, Friday and Friday Night. The full NWS forecast at weather.gov runs about seven days. For longer-range planning, use the NWS 8-14 day outlooks from the Climate Prediction Center instead.
How often is the forecast updated?
NWS forecast offices typically issue updated forecasts several times a day and more often when weather is changing. This tool caches the NWS response for roughly 30 minutes so repeated requests do not overload the public API, and it displays the Updated time reported by NWS. If that timestamp looks old during a fast-moving storm, check weather.gov directly.
Does it show severe weather warnings?
No. The tool shows forecast periods only. Tornado, flood, hurricane and winter storm watches and warnings come from a separate NWS alerts service that this tool does not query. If the detailed forecast mentions severe storms or hazardous conditions, open weather.gov for your county, follow local emergency management, and enable Wireless Emergency Alerts on your phone. Never rely on a summary page for safety decisions.
Can I get the forecast for my own town or ZIP code?
Not in this tool. It supports five preset cities, Chicago, New York, Los Angeles, Seattle and Miami, using their city-center coordinates. Forecasts can differ noticeably across a metro area, for example near Lake Michigan or between coastal and inland Los Angeles. For any other US location, enter your ZIP code or city on weather.gov, which uses the same NWS data at your exact grid point.
What is the difference between the short and detailed forecast?
The short forecast is a brief phrase such as Chance Showers And Thunderstorms, suitable for a quick glance. The detailed forecast is the full sentence written by the NWS office, usually including precipitation chance as a percentage, wind direction and speed, and sometimes expected rainfall or snow amounts. A 30 percent chance of rain means a 30 percent chance that measurable rain falls at any given point in the area during that period.
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