I'm certain that the STS-127 crew is growing a bit tired after the third consecutive scrubbed mission was called Monday due to weather conditions. Even if they weren't growing tired of mother-nature, they certainly must be very eager to get underway with their mission and I couldn't blame them one bit for that!
The next launch window will come tomorrow at 6:03PM EST at Florida's Kennedy Space Center. Weather forecasters are giving a 60% favorable launch conditions, meaning there is only a 40% chance of bad weather conditions that would possibly scrub the launch again, the same conditions that scrubbed the Saturday, Sunday, and Monday attempts.
The STS-127 mission has been plagued with problems from the beginning. What was once slated for a June launch, has been pushed back over a month due to a leaking fuel tank which caused many scrubbed launches until they finally corrected the problem.
If the Wednesday launch doesn't take place, the crew will have to wait until late next week before another attempt is made because a Russian space capsule will be launching later this week which is a high priority mission that re-supplies the International Space Station.