Originally Posted by GuitarWizard

Hottest temps I've ridden in were 140 degrees in SoCal - tires didn't melt, but I did go through 2 water bottles in around 12 miles (was riding super easy, just wanted to see how how it would get while riding that particular day). Even my handlebars and feet were uncomfortably hot that day, it was so hot it felt claustrophobic in some weird way. I live in Tucson and it's strange...it feels warmer here, but it was warmer where I lived in SoCal (Santa Clarita). In Santa Clarita, in the afternoon in summer I'd routinely see 115+ degrees on the Garmin. The most brutal ride I did in the heat was 120-126 degrees through the Santa Monica mtns - death march that day. We were supposed to descend Encinal Canyon and ride up Latigo, but I talked the group into going back up Encinal back to Calabasas where we started from as it was the easiest way out of Malibu (climbing in 124 degrees sucks BTW) as the temps were already hitting 105 degrees on the descent of Encinal to the PCH. A hiker actually died in the mountains from the heat that day. Here in Tucson, I don't really see much above 110 degrees (usually 106 or so) but these days I try to avoid the heat as much as possible. The main difference is here in Tucson in the peak summer heat, it doesn't really cool down below 80 degrees, whereas back in Santa Clarita even in the summer it would get into the upper 40's/mid 50's overnight - for a week or so you might see in the 60's for the 5:30 a.m. Friday morning rides we used to do.