from that short piece of code only a rough estimation can be told.
Looks like there are libraries with names
OpenWeatherMapCurrentData
OpenWeatherMapCurrent
OpenWeatherMapForecastData
OpenWeatherMapForecast
defining objects with the names
currentWeather;
currentWeatherClient;
forecasts[PRONOSTICOS_MAXIMOS];
forecastClient;
if this is true depends on the rest of the code
So if you want a more precise explanation post the whole sketch using this method
You should post code by using code-tags
There is an automatic function for doing this in the Arduino-IDE
just three steps
press Ctrl-T for autoformatting your code
do a rightclick with the mouse and choose "copy for forum"