The Collaborative International Dictionary of English v.0.48:

Sunlit \Sun"lit`\, a.
   Lighted by the sun.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sunlit
    adj 1: lighted by sunlight; "the sunlit slopes of the canyon";
           "violet valleys and the sunstruck ridges"- Wallace
           Stegner [syn: sunlit, sunstruck]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "sunlit":
   ablaze, aglow, alight, bathed with light, bespangled, brightened,
   candlelit, enlightened, firelit, gaslit, illuminated, in a blaze,
   irradiate, irradiated, lamplit, lanternlit, lighted, lightened,
   lit, lit up, luminous, moonlit, spangled, star-spangled,
   star-studded, starlit, studded, tinseled