For an outdoor area, you need a cooling system like they use on patios or for sporting events. Usually you would get a “misting fan.“ This is a fan which also connects to a hose so it creates a mist, not just moves the air around. These have been measured to reduce temperature on a patio by as much as 10°C.
There are actually a couple of companies in Brazil that make these, so you should be able to find some locally. One of the bigger companies is Joape.
Here is a listing for one of their devices which is sold in the US, but again you should be able to find one locally. Prices will vary, I am just putting this here as one example.
If you want to automate it, you will need to find one that works whenever power is restored so you can just plug it into a smart plug in module.
There are also much less expensive systems, maybe around $60 in the US, which are basically a hose and nozzle combination. They are often sold for horse corrals. So you might also be able to find something like that, although those would be more complicated to network.
They have a cooling pad and a water bowl made of clay, that helps to keep the water fresh! And there is a roof to protect them from the sun!
The real problem is because in the city that I live we haven’t seen the rain for 5 months, since May! I will look for this misting fan! Do you think this plug would help me to automate it? Or I would only be able to turn on and off remotely?
The first question is what the fan does when it was on, then the power was cut, and then the power is restored again.
Some fans will turn back on when the power is restored. But other fans will remain off.
So it doesn’t matter what smart plug you pick if the fan itself won’t come on when the plug comes on.
So the first thing you need to do is investigate possible misting fans or misting systems and get in touch with the manufacturer of that system and find out what happens if the cooling Device was on when the power goes off and then the power comes back on.
Once you find a cooling device that will come back on when the power is restored, then you can look at the right network switch to control that power.