October Weather in Greater Phoenix

How to Dress for Halloween Activities and Parties in October

Weather in Phoenix on October 31
© Goodyear, AZ

By the time October comes around, we who live in the Phoenix area have already had five months of summer, and welcome the less extreme temperatures of fall. Actually, this is the weather that we love the most — when the rest of the country starts to brace for their first snow, fall in the desert is balmy and outdoor activities fill our free time.

Be aware, though, that on Halloween it isn't always as cool as you hope it is going to be. Before you dress up your three-year-old in that adorable furry lion costume, make sure you consider what it will feel like inside that suit. On a personal note, long ago I purchased a Halloween sweater so that I could answer the door for trick-or-treat guests appropriately attired. It was always too hot to wear that sweater and I eventually gave it away, having worn it only once!

As you travel up north to Sedona, Flagstaff, the Grand Canyon and Northern Arizona that the weather is very different. Those destinations are at higher elevations and they experience true fall and winter weather.

Now, the details! The primary source for the following data is the National Weather Service and covers data collected from 1981 - 2010. All temperatures mentioned are degrees Fahrenheit. Check here if you need to know how to convert Fahrenheit to Celsius.

October 31 / Halloween Weather in Greater Phoenix

  • Overall average temperature for the month of October: 77
  • Average high temp for October: 93.5
  • Highest average temp on October 31st: 82
  • Highest average temp in any single day in October: 93 (October 1)
  • Average low temp for October: 55
  • Lowest average temp on October 31st: 52
  • Lowest average temp on any single day in October: 48 (October 29)
  • Highest maximum temp on October 31st: 96
  • Highest maximum temp on any single day in October: 107 (October 1 & 2)
  • Highest minimum temp on October 31st: 68
  • Highest minimum temp on any single day in October: 83 (October 2)
  • Lowest maximum temp on October 31st: 59
  • Lowest maximum temp on any single day in October: 56 (October 30)
  • Lowest minimum temp on October 31st: 36
  • Lowest minimum temp on any single day in October: 34 (October 30)
  • Normal amount of rainfall on October 31st: .02 inches
  • Most rainfall on October 31st: 1.05 inches
  • Most rain on any single day in October: 2.32 inches (October 14)