Observing Forecast

Cornwall is fairly rubbish for astronomy most of the time. This little widget has proved to be more accurate than most, and coupled with satellite imagery helps in planning any up and coming clear conditions.

I can highly recommend the first two apps that provide pretty accurate forecasting suitable for the astronomer. The third – Weatherpro HD is better suited to normal daytime forecasting.

I’ve listed them in my preferred order of accuracy.


Windy.com users can now visualise the most detailed forecast available for the UK, with the Met Office UKV 2km model output now available on web and app. That combined with the 1.3km cell size AROME forecast model seems to be providing the most accurate cloud forecasts for us here in Cornwall. It also provided a meteog chart with cloud density and level charts, which is also very useful.

The free version is fine, but I’d recommend you pay for the premium version and get the 1 hour interval chart generation.

Clear Outside

Clear Outside is built using a number of fantastic technologies and includes data from a wide range of sources which are statistically collated together to provide the a reasonably accurate forecast for a given location. Data sources include:

  • Dark Sky
  • UK Met Office
  • MET Norway
  • Environment Canada
  • US Navy
  • Light Pollution Map

Weatherpro HD

WeatherPro for iPad was first launched at the same time as the European iPad launch in May 2010. Developed in line with the hugely popular iPhone app, WeatherPro for iPad provides a seven day forecast with three-hourly intervals for over two million locations. High resolution, real-time radar and satellite images make it easy to see exactly what is happening so you won’t be caught out by sudden changes in the weather.

WeatherPro Premium is also available on iPad with subscribers benefiting from a whole range of extra features including hourly forecasts for two weeks ahead, radar forecasts and lots more!

The Pro version yearly subscription is worth the £5 upgrade, just for the satellite image data.

Forecast for the Next Three Days


Actual Weather Now

Current Weather

Current Satellite Imagery