I have identified that the source of the weather chart in Mr Hall's video is weatherspark.com.
It is for Faro airport. weatherspark.com does not pick up Sagres weather station, and there is nothing it does pick up that is closer to Luz than Faro. The next nearest is Beja airport, which is about 70 miles N of Faro.
weatherspark.com does appear to have some indication of cloudiness v sunniness. It looks to be highly aggregated, and I can't extract anything that is anywhere hourly, certainly without signing up for a weather service that I don't want.
The provenance of Mr Hall's chart is that it appears to be based on a very similar chart developed by Peter Mac on another forum. This confirms the idea raised earlier in this thread of Peter Mac's involvement and his acknowledgement that it based on Faro.
At weatherspark.com, you get more frequent information about wind direction and speed, and the bottom line is that the wind was never from Faro to Luz, though it often went the other way, giving an extremely crude indication of what had happened upwind at Luz.
On Wed 2 May 2007, the wind was basically from Sagres to Luz to Faro. Sagres got 3mm of rain, Luz got enough to rain off the morning tennis, while Faro got roughly 0.1mm.
Basically, anyone trying to use the Faro weather to 'predict' the Luz weather is on very shaky ground.
So you can compare for yourself, here is a copy of a screencap, made by Carana, of Mr Hall's weather chart. It covers 8 days. I have put in an equivalent from weatherspark.com. Mine only covers 3 days, and I have squeezed the width to match the same 3 days on Mr Hall's graphic.
There are differences in averaged or max/min figures, because I picked the data up this week and Peter Mac picked it up goodness only knows how far back. But the ones that should not change - actual temperature, wind speed, wind direction - have not changed.
Another one bites the dust.