That is a little bit too much.
After a period with 30-33C, I looked for a thinner and lighter leather jacket. My old jacket was very heavy to wear over one arm when walking around on a bike and car meet.
I brought a fish scale to shops so I could compare jackets.
Found a lighter, slimmer leather jacket full of vent holes. Zippers to open front and rear for ventilation.
Big difference a really warm day.
A cold day too, but not that convenient
My 25-30+C jacket.