add one of these and you will know for sure. I know you know the weather down there but that's to expensive to play around with
Maybe this Yolink device.
What are you using for home automation? I'm running these with HomeAssistant
https://www.amazon.com/Wireless-Temperature-Humidity-Monitoring-Smartphone/dp/B08JP39RLP/
We got these: https://www.amazon.com/Wireless-Temperature-Humidity-Monitoring-Smartphone/dp/B08JP39RLP/
Combating the same effective problem, put one in our freezer and the second in our fridge. Working well so far.
This set works for me: https://www.amazon.com/Wireless-Temperature-Humidity-Monitoring-Smartphone/dp/B08JP39RLP/
I can recommend the YoLink system in which the sensors connect to the Internet through a hub connected to your router. The smartphone app lets you see sensor history and graphs and allows you to set high and low temperature alarms that are immediately will show on the smartphone banner, along with emails.
https://www.amazon.com/Wireless-Temperature-Humidity-Monitoring-Smartphone/dp/B08JP39RLP
If you are ok with smart devices, I am a huge fan of YoLink devices. They already saved my basement from flooding with their waterleak sensors.
You can get This combo of hub+indoor sensors:
https://www.amazon.com/Wireless-Temperature-Humidity-Monitoring-Smartphone/dp/B08JP39RLP
as well as this outdoor sensor:
https://www.amazon.com/YoLink-Temperature-Hygrometer-Thermometer-Integration/dp/B08Z394BDX
I haven't used one, but I found this on Amazon