Those photos have been taken roughly one year ago, Oriental Bay, Wellington.
It was raining during most of the shooting, which accounts for the colors. Those colors were real, this is no additional filter. Some weather conditions can cause these effects, especially when it's raining or during a thunderstorm. These images were taken within about 30-45 minutes, the color changing from gold over red to deep purple.
The last of these was also chosen as a cover image for NZPhotographer magazine, issue 13, November 2018 - this one is still my favorite.
All images are available as prints, if you're interested, firstname.lastname@example.org