🌤 Weather Forecast
Weather lookup for any city worldwide: current conditions and a 7-day forecast from the national meteorological models behind every weather app.
What Weather Forecast Does
This tool returns current conditions and a seven-day forecast for a city: temperature, humidity, wind speed and a described sky condition, in Fahrenheit and miles per hour by default with a metric toggle.
The underlying forecast is not generated here and is not generated by any weather brand you have heard of either. It comes from numerical weather prediction models run by national meteorological agencies — NOAA in the United States, DWD in Germany, ECMWF in Europe, Météo-France, the UK Met Office and others — whose output is published openly. Open-Meteo aggregates that output and serves it as an API.
That is the useful thing to understand about weather forecasts generally: the expensive part is the modeling, it is done by public agencies with supercomputers, and the apps competing for your attention are mostly interfaces over the same small number of underlying models. Where they differ is presentation, which model they favor, and any post-processing they apply.
How to Use Weather Forecast
- Enter a city name or coordinates
- Click "Get Weather" to fetch the forecast
- View current conditions (temperature, humidity, wind)
- Scroll down for the 7-day forecast
Formula Used by Weather Forecast
Unit conversion, done locally
°F = °C × 9/5 + 32; mph = km/h ÷ 1.609344
- 1.609344
- Kilometers per mile, exactly — the mile is defined from the meter
Worked example
A live reading for New York on 11 September 2026: 19.6 °C, wind 9.0 km/h.
- Temperature: 19.6 × 9/5 + 32 = 67.3, displayed as 67 °F
- Wind: 9.0 ÷ 1.609344 = 5.6, displayed as 6 mph
Result: 67 °F and 6 mph. The forecast is fetched once in metric and converted here, so switching units is instant and does not cost another request.
Who Actually Produces the Forecast
National meteorological agencies whose model output Open-Meteo aggregates. These are the same public models that underlie most consumer weather products.
| Agency | Country or region |
|---|---|
| NOAA | United States |
| ECMWF | Europe (medium-range, widely regarded as the strongest global model) |
| DWD | Germany |
| Météo-France | France |
| UK Met Office | United Kingdom |
| MET Norway, MeteoSwiss, KNMI, DMI, GeoSphere Austria | Europe, regional high-resolution |
| JMA, KMA, CMA | Japan, Korea, China |
| GEM, BOM | Canada, Australia |
How Confident to Be, by Lead Time
General guidance on numerical weather prediction skill. Forecast accuracy decays with range and decays faster for precipitation than for temperature.
| Lead time | Temperature | Rain timing and amount |
|---|---|---|
| Today and tomorrow | Reliable | Reasonably reliable |
| 3 days | Good | Broadly right, timing may slip |
| 5 days | Useful trend | Indicative only |
| 7 days | A trend, not a forecast | Treat as a hint |
What a Weather Code Is
The condition text and icon come from a WMO standard code returned with the forecast, not from a description written by anyone.
| Code | Meaning |
|---|---|
| 0 | Clear sky |
| 1–3 | Mainly clear, partly cloudy, overcast |
| 45, 48 | Fog and depositing rime fog |
| 51–55 | Drizzle: light, moderate, dense |
| 61–65 | Rain: slight, moderate, heavy |
| 71–75 | Snow: slight, moderate, heavy |
| 80–82 | Rain showers: slight, moderate, violent |
| 95–99 | Thunderstorm, with hail at 96 and 99 |
How to Read Your Result
The forecast is for a grid cell, not for you
Numerical models divide the atmosphere into cells — kilometers across for the best regional models, tens of kilometers for global ones — and produce one value per cell. Everything inside a cell gets the same forecast, and the model also assumes a single terrain height for it, which can differ substantially from yours if you are on a hill or in a valley. This is why a forecast can be accurate for your area and wrong for your street, particularly for temperature in complex terrain and for showers, which are smaller than the grid.
Seven days is two useful days and five hints
Forecast skill decays with lead time because small errors in the initial state of the atmosphere grow — the reason a deterministic forecast beyond about a week is not meaningfully better than climatology. The first two days are genuinely reliable, three to five days are a good trend, and day seven should be read as an indication of the pattern rather than a statement about that day. A seven-day panel presents all seven with identical visual confidence, which is a presentation choice rather than a claim about accuracy.
For severe weather, go to the national service
This tool shows model output. It does not carry watches, warnings or advisories, which are issued by human forecasters at national agencies — the National Weather Service in the US — and which are the authoritative source when conditions are dangerous. A weather code indicating thunderstorms is not a severe thunderstorm warning, and nothing here should be used to make a safety decision. Check weather.gov or your national meteorological service.
What this page does not do, by design
It asks for no location permission, sets no advertising identifier, and loads no third-party tracker to serve you a forecast — you type a city name and get an answer. That is a deliberate contrast with the category, where weather apps are among the most aggressive collectors and resellers of location data in consumer software. It is not a ranking advantage and it is not offered as one; it is simply the trade being made in exchange for a plainer product.
Limitations & Accuracy Notes
- A wrapper over an aggregated public forecast. It adds no modeling, no post-processing and no local calibration.
- No severe weather watches, warnings or advisories. Those come from national agencies and this tool does not carry them.
- No radar, satellite imagery, hourly detail, precipitation probability, "feels like" temperature, UV, pollen, sunrise or sunset.
- City-name search only. There is no geolocation, no coordinates entry and no saved locations, so a large metropolitan area resolves to one point.
- Forecasts describe a model grid cell at a model terrain height, which may differ from your actual location and elevation.
- Seven days are shown with equal visual weight despite very unequal reliability — see the lead-time table above.
- Current conditions are model output at up to fifteen-minute resolution, not a reading from a nearby station, so they can differ from what a local observation reports.
Frequently Asked Questions
Where does the weather data come from?
How accurate is the forecast?
Where does the forecast actually come from?
How far ahead is the forecast reliable?
Do you show weather warnings?
Do you need my location?
Why is the forecast wrong for my exact address?
Can I switch between Fahrenheit and Celsius?
References & Further Reading
- Open-Meteo — Weather Forecast API documentation — The aggregator this tool queries, and the list of national agency models behind it including NOAA, ECMWF, DWD, Météo-France and the UK Met Office, plus the WMO weather-code table this tool translates into condition text
- NOAA National Weather Service — The US authority for forecasts, and the source of watches, warnings and advisories that this tool does not carry