Just be aware that if someone on the ground answers and tells you the weather, it may or may not be correct!!!
A lot of uncontrolled airfields (and quite a few controlled as well) have an AWOS. Sort of like a continuously, automatically updated ATIS without an identification letter. Very accurate when it comes to wind and visibility, but less accurate when it comes to cloud.
"Have the weather" is the standard R/T phrase to let a tower know you've heard the AWOS. At an uncontrolled field you use it to determine runway in use, and the circuit direction for each runway is listed in the A/FD, the little green book that the FAA publishes every 56 days (I believe) and is a must to have.
Joining an uncontrolled field is as simple as "Sebastian traffic, Cadet 250FT, 10 miles west with the weather, 3000 feet, inbound to land 09, Sebastian".
At Sebastian, incidentally, the AWOS transmits on the CTAF frequency after clicking your mike something like three times. And most AWOSes have an associated telephone number as well which you can use to get the weather at your destination before you set off.