REMS weather data from Curiosity

Daily temperature
Daily atmospheric pressure

Other raw image websites

NASA/JPL official MSL raw images website
raw images listing by Ludo Stellingwerff
raw images listing by Dan Lidral-Porter

MSL mission, general links


Official NASA/JPL MSL website
Mars weather -- REMS team

Forums

MSL forum at unmannedspaceflight.com
Curiosity surface operations at cosmoquest.org
Curiosity subreddit at reddit.com

Bloggers

Emily Lakdawalla/Planetary Society
Cosmiclog by Alan Boyle/MSNBC