One of my antennas is in a non-ventilated box outside in (mostly) direct sunlight. For the past couple weeks, it’s been very hot. Lately, a high of 90F (32C) is cold. The typical high has been mid 90’s F (32C) to 100F (38C). Attached are some temperature for the past 3 weeks. Rpi foundation won’t release an operation temperature range. In the past, they have stated two maximum temperatures based on two components on the board. 70C and 80C.
The operating temperature for my SD card: -13F to 185F (-25C to 85C).
Below are some graphs. Bottom line, despite high temperatures, everything operates normally.