They say if left at the wrong temp for 24 hours a beetle infestation could break out! I'm in the UK so not that usual to get long hot days, but its summer now and 27 to 30 degrees celsius at the moment so my ciagrs keep going above the recommended temp at leat 12 hours of each day for the last couple of weeks and probably the next six, with occasional days of normal temperature. Haven't seen any problems yet, but i think I should smoke more cigars before summer and just buy when i want some in summer, then fill up again in autumn.