Folding@Home client on a laptop: Is it safe for long periods?

These temperatures are too high. My laptop runs Folding@home and the temperature doesn't get much higher than 75°C in the hottest conditions, and typically not above 70 °C, but that's still high (if I am not mistaken, my laptop has a temperature limit of 90°C).

Your system was running at 92°C, just 7°C below the 99°C limit, and the fan was running very fast (4627 RPM). This is clearly too hot and probably cannot be sustained for long-term operation. A cooling pad may help, but it may not drop temperatures satisfactorily. If you are doing SMP work units, try falling back to uniprocessor units and see if the temperatures become more reasonable.

I have been running BOINC projects on my laptops 24 hours a day for 3 years now. During the time, the older Thinkpad has actually failed twice but Lenovo has been able to fix it in both cases. They didn't tell me exactly what was broken, but I was told on the phone that it's due to faulty graphics chip (nVidia!!!) and water damage (no idea why). Otherwise the laptops are running smoothly apart from being occasional sluggish. Also, the fans are constantly on all the time, even during the winter, but I have learned to live with that. (I have to replace the fan this year because it's jammed.) I think this is little price to pay to contribute to the scientific community.

However, your temperature seems to be seriously high. My CPU runs at 70 degrees most of the time and that's already very high. You may want to limit the CPU usage of the projects; otherwise you can actually burn out your computer.