Design of a connected weather sensor Wezr is the first mobile weather sensor that constantly updates weather forecasts to the nearest kilometre. Coupled with a smartphone via Bluetooth connection, it allows outdoor athletes to know the local weather conditions with precision, updated every 5 minutes. Wezr is the subject of a crowdfunding campaign on Kisskissbank, it is a success: it has made it possible to finance the project at more than 250%! It is available for sale on the Wezr website.