To improve the first sentence:
It seems like it will be 36℃ (96.8℉) on Friday.
Or:
It seems Friday will be 36℃ (96.8℉).
Or even better, specify why it seems this way, ie, what is your information source.
The second sentence is technically OK, but lacking detail:
It's September 20th!
To improve it slightly, you could say:
It will be September 20th!
But ideally you'd give a reason why this is important to know.
When I Googled "Tokyo weather", Google suggested ...
Or:
When I searched Google for "Tokyo weather", it suggested ...
... I search "Toyko weather crazy" and "Breaking news: Kantō (Eastern Japan) weather crazy". LOL.
What's going on?
Or:
What's up with that?