I came back from Canada this week to find a state of emergency declared and most major roads closed at least part of the week. This is the height of Costa Rica's rainy season, from late September through early November. Luckily, the waters recede quickly, so that traffic is now restored between San Jose (where I live) and Guanacaste (where I live and work). Roads were impassable or hugely delayed for two days as rivers rose. While Costa Rica is too far south to be in the hurricane routes, heavy rains are the norm now.
For the next three weeks, keep in mind our top ten reasons to visit Costa Rica during the rainy season. http://www.greensealrealty.com/tt/one.html Reasons no. 3 and 1 apply for fun and profit.
Hint: don't even think about renting an ordinary car, it's 4 x 4 time! These amazing rental supercars can ford streams and practically walk on water, which they may need to do! This is the perfect time to do extreme real estate searching.
This is not the time to sell Costa Rica real estate, but it is the time to buy it or vet it. See with your own eyes which preconstruction condos have been built right, and which real estate deals are deals for the buyer, or for the seller.