I can understand your concern about the temps. I've lived in El Centro area for over 30 years.

Perhaps this information will help plan the trip.

http://biology.fullerton.edu/facilities/dsc/zz_climate.html

Note the comment about the afternoon thundershowers in Sept.

Trying to think ahead. <img src="/forums/images/graemlins/pfft.gif" alt="" />

92 Montero LS, Rancho Shocks, Hellas, AirLift bags,
99 Superduty 7.3, Rancho 9000s, Superchip, Banks Billet Torque Converter, AirRaid, BFG's, Pillar Guages, 4.5" Exhaust