Aug 21 (Reuters) -ICE cotton futures edged up on Monday as hot and dry weather conditions in the key U.S. growing regions raised concerns about supply, although weaker demand worries from top consumer China kept gains in check.

* The most-active December cotton contract CTZ3 rose 0.14 cents, or 0.17%, to 83.76 cents per lb at 12:05 p.m. EDT (1605 GMT).

* "I assume it's because of the weather which is really supporting corn and soybeans," which in turn is helping cotton, said Jack Scoville, vice president at Chicago-based Price Futures Group.

* Power demand in Texas was on track to hit an 11th all-time high this summer, as homes and businesses keep their air conditioners cranked up during a lingering heat wave.

* Chicago soybeans rose for a fourth straight session while corn prices edged higher underpinned by weather worries. GRA/

* The market is also watching out for the weekly U.S. Department of Agriculture crop ratings due after market close on Monday to see if dry weather last week has already strained some crops.

* Offering support, the S&P 500 and Nasdaq climbed with investors focusing on a meeting of central bank policymakers for clues on the U.S. interest rate path. .N

* "The market needs some better demand than what it has been getting and it needs some reason to believe that China will step up and become a really big buyer, which it really doesn't have right now," Scoville added.

* The yuan has weakened more than 5% against the greenback so far this year, reflecting growing concerns about the outlook for the world's No.2 economy.

Reporting by Rahul Paswan in Bengaluru; Editing by Shailesh Kuber