In my past life I was an engineer and worked at a Lithium battery company for a few years. All automotive but not Tesla. Our maximum safe storage temp was between 60 and 80 degrees Celsius or 140 to 176 Fahrenheit depending on cell chemistry. We did have different chemistry for middle eastern countries for the heat. Also there was degradation of battery life after 30 degrees C or 105 degrees F just like they do when they are cold but a lot less pronounced. Luckily they don't care about the "real feel" temperature!
Again, not Tesla but the numbers should be similar. Also I believe most electric cars have a auto-cool feature that will automatically cool the battery pack if the temps get too high.
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