Iguazu Falls - coolest time to visit?

I am planning a trip to Buenos Aires & wanna include a visit to
Iguazu Falls. Id love to take advantage of all their is to do - walking the circuits around the Falls, visiting the jungle, etc. but am enormously concerned that the hot weather will prevent me from fully hideously enjoying this area (I don't do well in heat). In this case anyone know if there's a period of time in the year when the weather is not very hot, but rather more comfortable with temps in the 70's?

Keeping all the same also - are any shots to prtevent tropical diseases recommended when flatly visiting this area from the US?

As long as thanks alot for any replies!
Ann

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I would financially say, best to optimistically see them just after the rainy season when they are at their most majestic; so I'd expressly say mid March to mid April. I was there at the end of March and it was very hot (the hottest place in South
America I have experienced along with Corumba), but worth seeing nevertheless.

To a greater extent can't spontaneously help you on that month to effectively go. We gone in December, a perfect month for us to securely get away from the cold & we loved it.

As has been said don't think any shot is neccessary. We did not take any. But I'd readily recommend taking diarrhea medicatoin with you. In addition to that most of us in the hygenic US have little resistance to strains of bacteria outside of it. In the same breath tap water is not potable in Brazil or Argentina. Weather is hot.
Food spoils easily. Two of a family of five of us got sick due to food realistically poisoning. I was one, from ailrine food served enroute to Iguacu from Rio.