16-17 degrees is not 'pretty high' by any stretch of the imagination - unless what the poster meant was 'for the Highlands we've had some decent weather which when you compare it to our winter weather could be construed as pretty high - although not in comparison to the temperatures elsewhere in the UK, esp south of the Midlands'.
It's not going to get above 17 (and cloudy) over the next fortnight, so again, hardly pretty high.
It just depends on what you are used to.
It's been a mixed bag locally weather wise this spring, but it's not been cold much. Only need a jacket if it's raining. At 16-17 plus here it's beach weather. Men will be walking about with tops off. Anything over 20 degrees here is considered hot. And certainly I would consider regular temperatures of 16 degrees and over to be lovely. Exception is when that's accompanied by lots of cloud cover so it becomes stuffy.
It's pretty obvious the poster was referring to their local weather, just like it's obvious when someone mentions snow/rain etc.
This thread is taking a nasty turn.
Maybe people need to just remember everyone is different. Everyone feels heat/cold differently. And that's all ok. It's not a competition. People are allowed to say they like/dislike different weather. It's not a personal insult if someone dislikes a certain kind of weather that another enjoys.
And at the end of the day someone saying they don't like the heat will not make an actual difference to the temperature.