South Africa are scheduled to clash with Sri Lanka on Wednesday but it appears that the players will have to come back on the reserve day at the newly-built Providence Stadium to get a result.
The rain may have a significant impact on teams such as England, who are entering the stage without any points, as they will by pinning their hopes on beating debutants Ireland on Friday.
According to the website www.weather.com, the temperature in Guyana's capital Georgetown will be around 87 F into the middle of next week and a daily downpour is expected.
Ireland were unable to practice outdoors on Sunday and had to be satisfied with playing rugby on Monday at the Bourda Ground after rain prevented them from holding a nets session.
"We got here on Saturday (from Jamaica) but we haven't been able to do much because of the weather," Ireland coach Adrian Birrell told Reuters.
"We struggled on Sunday to even get started. Today we got started and it rained halfway. Instead we planned a gym session and a pool session after that.
"We're trying to keep busy and keep working away where we can. The other countries are all in the same boat as us and struggling as well. We've just got to keep at it and do what we can.
"We are going to go to an indoor hall that has a bowling machine so at least our batsmen should have a bit of a hit.
"It's frustrating but it's frustrating for everyone. It's good to know that the others are also struggling to keep busy and preparing for the big games."
