Many people feel the best desert season is from October through April, when high temperatures are in the 60 and 70 degree Fahrenheit range. Nighttime temperatures during this time can fall below freezing. The hottest period is from May through September, when highs average in the 100's F. Still at night, temperatures drop by as much as 30 degrees F, and high in the Rincon Mountains it is cooler, too. Rainy seasons occur twice a year—in short but violent thunderstorms from July through September and in gentle rains from January to March. Otherwise, sunshine prevails.
The desert follows rhythmic cycles, seasons of activity followed by seasons of quiet. Rain, or a lack of it, marks the changes, though temperatures also make a difference.
Winter: December to February: The gentle rains of winter ready the desert for its busiest time of the year. By late February, annual wildflowers begin to bloom and birds start to nest.
Spring: March to May: The last weeks of March and first weeks of April are the height of spring activity and flower bloom. Insects swarm around the flowering plants, and many birds take advantage of this food to raise their young. Winters with plenty of rainfall at the proper times may produce spectacular wildflower displays. Flowering trees and cacti are not as sensitive to rainfall and temperature and usually have a good bloom each year. The saguaro cactus bloom peaks in May and June.
Summer: June to August: A tremendous variety of cactus means that blossoms can be seen from mid-April into September. Summer heat reaches its peak in June and July. Throughout the summer, almost all animal activity occurs in early morning, late evening or at night. July and August also bring our summer monsoon season. Rainfall can be very intense.
Fall: September to November: Quiet time, cooling temperatures make for good hiking conditions, especially in the mountains.
For Your Safety: Hiking and other strenuous activities in extreme heat can be hazardous. Pace yourself and rest often. Carry water (at least 1 gallon per person per day is recommended) and drink even when you don't feel thirsty. There is no water available at picnic areas or along most trails. Beware of painful encounters with cacti and other prickly plants. Be especially careful near cholla cactus spines that, with just the slightest touch, can become embedded in your skin. If a cactus joint attaches itself , use two sticks, a pocket comb, or other object as a lever to flip it away.
from Away.com
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