It makes sense and you can certainly say it but it wouldn't be my first choice. The phrase "there isn't much sun there" works better, for example, to describe a portion of a garden that is shaded by a tree. To describe a location where the weather tends to be cloudy, I would prefer any of these: "The weather is 'cloudy' or 'overcast' much of the time." "They don't get a lot of sunshine there." "The sun doesn't come out much."

Yes, as an American, this makes sense. "I went to the beach, but there wasn't much sun. I was disappointed." "In Northern countries, people try to make the most of the daylight, because during the winter there isn't much sun." Good luck!

"There isn't much sun" sounds fine to me. I wouldn't use it formal writing, but I might say it in casual conversation.

Hi Sonia! I'm English and my natural reaction would be to say, "it's not very sunny". Although you could also use some of these other phrases instead: ⭐️Not much sun on one particular day: - What a miserable day! - The weather is looking grim. - It's so grey and miserable today. - It's really overcast today. ⭐️A place doesn't have much sun in general: - We don't get a lot of sunshine here. - The weather in England is rubbish/miserable. - It's so grey all the time. Hope that helps!

It’s very natural but, without context, rather imprecise. It could be referring to conditions of shade, season, climate or weather. The present tense is usually the most general and sweeping so it works less well for the weather.