There is a strong chance that rain will strike Interlagos during Sunday afternoon's Formula 1 season finale and the 31-year-old Briton, who has won twice in rain-hit races this year, insists that the event holds no fears for the team whatever the weather.
"You never know on a wet race because so much can happen," said Button. 'When you are at the front, you hope that it's going to be dry more often than not because it makes it a more straightforward race and you have more chance of winning.
"If it rains, it mixes it up and you can make a bad call, especially in mixed conditions. But whatever happens, we will deal with it. We are pretty good at doing that and staying calm in tricky conditions."
Button stopped short of predicting that the McLaren will be more competitive in wet conditions than Red Bull, whose drivers have locked out the front row.
"Downforce-wise, they are still stronger than as and as you can see they are slower than us on the straights.
"They have a very good set-up and are going to be difficult to beat wet or dry."
Team principal Martin Whitmarsh echoed Button's sentiments, backing both Button and Lewis Hamilton and the team to deliver in the race.
"I suspect that everyone has gone higher on downforce in anticipation or rain tomorrow," he said. "We've done the best job we can in terms of the level of downforce and we are starting on the second row.
"We have two great race drivers and if it is wet, as anticipated, then I'm sure that it's going to be an exciting race and we should be comfortable that we can do a decent job."