This is typical. I arrived at Foz do Iguaçu Friday afternoon. The weather was great. Saturday and Sunday while I was at the falls, it was raining or it was overcast. Now, we are on Monday, I am leaving Puerto Iguazú for Buenos Aires in a couple of hours and the weather is great again. Maybe I have really brought the British weather with me or it is a ploy to re-aclimate me to said weather before I go back at the end of the week.