No heatwaves/Thunderstorms in Sulani during summer/spring?

I have seen rainfall in Sulani in the spring — I actually had sun showers once. I have also had monsoons more than once in the summer.

These did come with lightning and very intense rain (which looked amazing over the deep water), and a lightning bolt from one of these once struck my sim’s deck and burned up a meditation stool. Afterwards, there was always a beautiful rainbow. It admittedly did rain more often in the fall and winter.