We strongly encourage you NOT to check the weather report for Blue Osa (or Costa Rica for that matter) on the internet. It is usually wrong and does not give an accurate picture of what to expect.
Furthermore, as we have said in the other FAQ answers, Blue Osa is in its own microclimate, and there is no accurate reporting on what to expect.
Seriously, we are not kidding.
If you need some historical reference, please see our weather report page.