It is terrible weather in the UK right now.
I am coming to Granada on Friday with Ryan air from Stanstead.

Do you have a weather forecast for Granada?

These are the weather pages I use.

The weather is normally better than they predict.
It's very rare for the temperature to go below -1C.

This Norwegian one is my favourite
https://www.yr.no/en/forecast/daily-table/2-2517117/Spain/Andalusia/Granada/Granada

This one has a 15 day forecast.
https://accuweather.com/en/es/granada/306729/weather-forecast/306729

This one used to be very good.
https://www.wunderground.com/weather/es/granada

This one is in Spanish
https://tutiempo.net/Tiempo-Granada-E18001.html

Guide to speaking about the weather in Spanish
https://lingolex.com/swom/wom-weather.htm

Look at a satellite picture of Spain. (search for it) 
(this can often be better than looking at a forecast)
Granada is not very rainy but if there is a big swirling cloud to the left of Portugal it often means that it will rain for several days.






 

In Spain in August it is common to have summer storms which only last a few hours.

There has been a lot of false reports of summer thunder storms in the weather forecasts recently.
This is probably because the storms are quite small and probably only a few miles across.

I have found that the best way of knowing if a summer storm is actually going to happen is by looking at a radar image.

There is one here.
https://www.accuweather.com/en/es/national/weather-radar