Temp, Animals and bugs in mid-September through November

Me and 4 friends are leaving Canada mid-September to Brazil and coming back mid-November. As of right now, i have 3 questions:

1)What is the temperature like during this time, is it still rainy season, hot in certain parts of the country?

2)We would like to take tours of the Pantanal and the Amazon, will the wildlife be flourishing at this time or is it dry season for visible wildlife?

3)I got dengue fever in Thailand last summer and im a bit worried about getting it again, are there certain regions were Dengue is worse?

You should get professional medical advice about Dengue fever as it is a problem in tropical Brazil, & I believe that if you've had one strain & then catch another it can develop into haemorraghic dengue.

What about your worries about how to hit on Brazilian women and get them drunk? Dengue is a problem in many areas of Brazil, including Fortaleza (several thousand cases this year, a few fatal hemorrhagic dengue cases, and intensive care units with no available beds), not just in tropical areas. Check travelers health section of www.cdc.gov