Weather API

The Weather API delivers quality weather forecasts to every coordinate point in the world. The interface with hyper-local forecasts is suitable for integrating weather conditions into mobile applications, web applications or any other application.

The forecasts can be given by coordinate or by location name. Coordinate based, the so-called hyper-local forecasts are calculated on the exact point in real time. All the commonly used weather parameters are available. If you need parameters not mentioned in this page, please read more about our add-on data sets or ask about our custom API's.

Current Conditions parameters

  • Name of the closest relevant weather station (e.g. London Heathrow)
  • Distance to the observation station
  • Observation time (latest)
  • Weather code and symbol (gif, png)
  • Temperature (°C, °F)
  • Feels-like temperature (°C, °F)
  • Wind speed (in m/s, kmph, km/h, knots)
  • Wind direction (N, NE, E, …, or pictures)
  • Air pressure (in hPa)
  • Relative humidity (in %)
  • Visibility (in meters)

Synthetic Observations parameters

  • Weather code and symbol (gif, png)
  • Temperature (°C, °F)
  • Feels-like temperature (°C, °F)
  • Wind speed (in m/s, mph, km/h, knots)
  • Wind direction (N, NE, E, ..., or pictures)
  • Precipitation probability (in %)
  • Precipitation sum for the 1-hour period (in mm)
  • Solar radiation

15-Minute Forecast parameters

  • Weather code and symbol (gif, png)
  • Temperature (°C, °F)
  • Feels-like temperature (°C, °F)
  • Wind speed (in m/s, mph, km/h, knots)
  • Wind direction (N, NE, E, ..., or pictures)
  • Precipitation probability (in %)
  • Precipitation sum for the 15-minute period (in mm)
  • Solar radiation (optional)

Hourly Forecast parameters

  • Weather code and symbol (gif, png)
  • Temperature (°C, °F)
  • Feels-like temperature (°C, °F)
  • Wind speed (in m/s, mph, km/h, knots)
  • Wind direction (N, NE, E, ..., or pictures)
  • Precipitation probability (in %)
  • Precipitation sum for the 1/3/6-hour period (in mm)
  • Solar radiation (optional)

Daily Forecast parameters

  • Weather code and symbol (gif, png)
  • Daily forecasted high and low temperatures (°C, °F)
  • Precipitation sum for the 24-hour period (in mm)
  • Wind speed maximum (in m/s, mph, km/h, knots)
  • Precipitation probability
  • Sunset and sunrise time
  • Moonset and moonrise time
  • Day length (in minutes)
  • UV index based on the global ozone forecast model
  • Average cloudiness
  • Thunder probability
  • Last-updated time
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Key Benefits

Current Conditions
In addition to forecasts, the API includes the latest measurements from tens of thousands of official weather stations worldwide. Vaisala gathers observation data from the official SYNOP and METAR weather station network and other similar high-quality sources worldwide. Observations are given from the closest, most representative reporting site to the requested forecast location.
Synthetic Observations
As official weather stations are not everywhere, the Nowcasting technology enables forecasting hyper-local current conditions also in locations that do not have a weather station close-by. The so-called synthetic (or augmented) observations are calculated in real-time to any coordinate point worldwide.
15-Minute Forecast
Vaisala provides forecasts in 15-minute steps for the following couple of hours, starting from the zero-time (synthetic observation). Rain, temperature, and cloudiness parameters are provided by Nowcasting technology and the other parameters below are broken down from the hourly forecasts’ data sets. 15-minute steps are recommended to use for the following 2 hours maximum.
Hourly Forecast
With hourly forecast data, you are able to receive weather forecasts in one-hour steps. Hourly forecast is adequate to show detailed weather forecasts in the coming days as a table or graphical module. In addition to 1h steps, additional 3h and 6h summaries are available. The data is provided for the next 14 days, including the current day.
Daily Forecast
Daily forecast is a 24-hour summary of the day. The data is provided for the next 14 days, including the current day.
Add-On modules
The following weather data can be delivered together with the Weather API: Weather Maps, Weather Warnings, Weather History, Weather Notifications, Climate Data and Marine Weather.

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