In Broad Daylight Meaning

(idiomatic) In a blatant and publicly visible manner.

Example: In ample natural illumination, during the daytime.
2008, Shelley Shelton, "Streaking fireball a vivid spectacle in daytime sky," Arizona Daily Star, 23 Aug. (retrieved 22 Sep. 2008):
  A fireball hurtled across the southern Tucson sky in broad daylight Saturday morning.
2008, Brian Benntt, "When Iraqis Come to America," Time, 24 Jan.:
  It's still too dangerous for the wife of a journalist who was murdered in the street in broad daylight.