About DatenUS Weather
DatenUS Weather republishes free public data from NOAA, the National Weather Service and other U.S. agencies. It is not affiliated with any of them.
From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.
Sources and update times
| Data | Source | Updates |
|---|---|---|
| Forecasts, hourly forecasts, current conditions | National Weather Service API (api.weather.gov) | Forecasts cached up to 30 minutes, observations up to 10 minutes; large cities refreshed hourly |
| Weather alerts | National Weather Service | Every 10 minutes |
| Radar | NWS NEXRAD via the Iowa Environmental Mesonet | Every 5 minutes |
| Hurricanes and tropical outlooks | NOAA National Hurricane Center | Checked every 10 to 30 minutes |
| Severe storm outlooks and storm reports | NOAA Storm Prediction Center | Checked every 10 to 15 minutes |
| Wildfires | National Interagency Fire Center (WFIGS) | Checked every 15 minutes |
| River flooding | NOAA National Water Prediction Service | Every 30 minutes |
| Drought | U.S. Drought Monitor | Weekly map, checked daily |
| Tides and marine forecasts | NOAA CO-OPS and the National Weather Service | Predictions cached 6 hours; station list weekly |
| Earthquakes, volcanoes | U.S. Geological Survey | Earthquakes every few minutes, volcano notices every 30 minutes |
| Space weather | NOAA Space Weather Prediction Center | Every 15 minutes |
| UV index | EPA and NOAA | Daily forecast, cached 1 hour |
| Air quality | EPA AirNow | Hourly |
| Climate normals and daily history | NOAA National Centers for Environmental Information | Normals 1991 to 2020; daily records for large cities loaded weekly |
| Wildfire perimeters | National Interagency Fire Center (WFIGS) | Checked every 30 minutes |
| HeatRisk | National Weather Service (experimental) | Hourly |
| Avalanche danger | U.S. avalanche centers via Avalanche.org | Checked every 30 minutes in season |
| Drought by county | U.S. Drought Monitor | Weekly, checked daily |
| Beaches | EPA BEACON 2.0 (reported by states after each season) | Beach list about every 3 weeks, details every 90 days |
Limits of the data
- A city or county forecast is the NWS forecast for one point, the center of the area. Weather can differ across a large county or in hills and valleys.
- Current conditions come from the nearest reporting station, often an airport, which may be several miles away. We do not show an observation more than 2 hours old.
- If a source does not respond, we say so on the page instead of showing old or estimated values.
- Times are shown in each location's local time zone.
See every source on the data sources page and the full disclaimer. Back to weather home.