I dont understand thermodynamics

I have a tent in My room right, and I've noticed that it always gets the hottest at around 8-9pm at night. For example, The ambient during the day the last few days was 25c in my room, and 27 in my tent from 8am to 5-6pm when the sun resides. As the temp drops, the tent repeatable heats up.

The temps aren't an issue at all, but I just find it fascinating I have this repeatable increase in temps as the ambient temp drops every afternoon.

Today at 8am it was 24c ambient and 26.8 in the tent, 3pm it was 25c ambient, and 27.5c in tent, at 8pm it was 21c ambient in my room but 29.5 in the tent. It starts cooling down at 9pm, and drops back to 25c in the tent with light on. At 11 it goes off and drops to 20c.

It's only a 2.3x2.3 tent, and I'm running 200cfm fan and 250cfm filter so there is tent collapsing airflow lol.

No question....just found it interesting that it's a repeatable increase every day when the ambient drops quickly.

I don't understand physics either, but it reminds me of house temperatures in summer, "hot summer nights". That's when, after sundown and it's cooler outside than inside, you can open all the windows, even run exhaust fans, but the house itself doesn't get cool until it's almost daylight again, 4 AM or thereabouts.

Seems like it would be something to do with mass of something in your tent heating up during daylight hours, and taking some time to release that heat.

Today my weather app said -1 cloud cover. I looked that up and it furthered my disdain for how ignant I am about air conditions.

Microphysics and more shit I don't understand at 7:00!

How do you introduced new air into your tent? is it passively through the vents? or do you pull air from outside your house?

I’m pretty curious about this too, has to be a cause or source. Maybe the intake is drawing air being warmed up from next/on concrete, a brick wall or a regular wall with minimal insulation

Dunno if this helps at all. but if you look at week/month of your temp and RH readings, it kinda looks like a heartbeat monitor reading. I've always tripped out on that.

So my house is old and poorly insulated (in the process of redoing the house). The sun warms the walls up during the day then it releases it at night. Because of poor insulation it releases it through the wall into the house. So my house is also hottest just after the sun goes down generally for an hour or 2 until the ACS cool it down.