Even before 8:00 AM we might say, "it's sunny outside" or "it's bright outside," if there are very few clouds and the sun is casting shadows. If we reference cloud cover regardless of day or night, we might say, "the sky is clear," "there are just a few clouds," or "there are patchy clouds." Before 8:00 AM, we might say, "It's a clear (or cloudless or partly cloudy) morning (or dawn)."
In the opposite conditions of sun and clouds, we might say, "it's dark outside," "it's dawn/dusk/twilight," "it's cloudy/overcast," or "the sky is grey".
The National Weather Service of the United States created meteorological forecast icon images and corresponding text descriptions that it uses on its website to illustrate the weather conditions of a location. The text descriptions are often used by meteorologists on television weather reports.
There also are precise definitions when speaking of science, law, the military, aviation, and naval activity of four (4) specific moments in every period of twilight: astronomical dawn/dusk, nautical dawn/dusk, civil dawn/dusk, and either sunrise or sunset.