Photo: Elf · CC BY-SA 3.0Supai has some of the warmest summer afternoons among U.S. towns
January nights here settle around 32°. It is a dry place: less rain and snow fall here than on almost every U.S. town. Compared with 1901–2000, the average now sits 1.9° higher. Plan time outside for April and October, when highs sit at 77–79°.
A year in Supai at a glance
Each month’s typical high and low, and what it brings.
What stands out about Supai’s climate
Compared with towns across the U.S., with Supai’s place in Arizona beside it.
What a year in Supai feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 8 inches of rain a year
August is the wettest month and June the driest.
Rain + melted snow by month
Inches of water
Living with Supai’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 8b.
Months with highs of 62–84° and lows of 40° or more: April and October. 7.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Supai from natural hazards, river flooding is the largest share (52%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Supai and similar climates
TownRatings has no climate map of the towns around Supai yet.
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Supai averaged 1.9° warmer than the 1900s. The biggest change is in January (+2.8°).
A bigger shift than in 85% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Supai compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Supai’s place among Arizona’s.
Supai weather by month
Highs, lows and precipitation from NOAA’s grid at Supai’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 55° | 32° | 0.8" | 39° – 50° |
| February | 61° | 35° | 0.7" | 41° – 54° |
| March | 69° | 40° | 0.6" | 48° – 61° |
| April | 77° | 45° | 0.3" | 55° – 66° |
| May | 87° | 54° | 0.4" | 63° – 75° |
| June | 98° | 63° | 0.1" | 74° – 85° |
| July | 101° | 69° | 1.0" | 82° – 88° |
| August | 99° | 67° | 1.3" | 79° – 88° |
| September | 92° | 60° | 0.7" | 72° – 79° |
| October | 79° | 48° | 0.7" | 59° – 69° |
| November | 65° | 38° | 0.5" | 44° – 58° |
| December | 54° | 31° | 0.6" | 37° – 48° |
| Year | 78° | 48° | 7.7" |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 44° to 58°. July is the most reliable, staying within 6°.
Where Supai’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Supai’s center.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Supai’s climate
What is the weather like in Supai?
A typical July afternoon reaches 101°, a January night drops to 32°. Milder January nights than 74% of U.S. towns; hotter July afternoons than all but 111 U.S. towns.
How cold does it get in Supai in winter?
December nights average 31°. In the coldest December of the last 30 years the month averaged 37°.
How hot does it get in Supai?
July, with a typical high of 101°. 90° days are rare.
What growing zone is Supai in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 18°.
What is the best time of year to visit Supai?
By one simple rule (highs of 62–84° and lows of 40° or more), April and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Supai getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 85% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Supai.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.