Operating temperature for a greenhouse

Hello everybody,
I’m lending a hand to a friend to help run an aquaponic greenhouse.
Different versions of Arduino Leonardo Eth + PoE will send the probe data (temperature, pressure, humidity, vibration) via MQTT to a broker installed on RaspPI.
Knowing that it will be very hot in the greenhouse in the summer, what can happen to the 6 arduinos enclosed in the IP65 watertight boxes?
Do you have experiences of this kind?
Could I alleviate the suffering by adding heat sinks to the ATmega32u4?
Thanks in advance,

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If you’re getting heating problems (and you might want a sensor in the box to keep track of this), consider putting the Arduino to sleep when it’s not needed.

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