Essentially identical to Earth - except:
- You’d be able to see Earth up there in the sky as a small light blue-ish dot - and (obviously) you wouldn’t see Mars as just another bright dot because you’re standing on it! Earth would appear somewhat like Venus does to us - you’d see Earth in the sky around dawn and dusk.
- You might also be able to see the Moon…again, at the right time during the Moon’s phases…which would be different from the phases as seen from Earth depending on the time of year on Earth and Mars at the time.
- You’d also be able to see Mars’ two tiny moons Phobos and Deimos which would have phases, as our Moon does. Phobos zips across the sky about three times a day - so you could be able to see it more than once every night - while Deimos orbits once every 30 hours - so there will be nights when you can’t see it at all. This is a time-lapse made by the “Spirit” rover.
Because of Mars’ very thin atmosphere - your view of the night sky won’t be inhibited by nearby cities (assuming there are any nearby cities!) due to “sky glow” - so you should be able to see the Milky Way and WAY more stars than you can see here from most inhabited areas on Earth.
It’s also notable that sunrises and sunsets on Mars are weirdly opposite to Earth. Instead of blue skies with orange sunsets - Mars has orange skies with blue sunsets. That’s going to take some getting used to!
I wonder how much this will confuse us in to thinking that it’s daytime when in fact it’s dawn or dusk?
These kinds of human instinctual-level thing will probably be only properly understood once people are living there.
Certainly we could have problems getting to sleep because of the blue light levels…we see that here on Earth if you watch too much TV or other screens when you should be getting ready to go to bed.
But doubtless we could arrange for light levels in the habitats of Mars to change color in an Earth-like manner in order to solve that problem.