Weather on September 15
Flagstaff, AZ
55 Years of Data
About This Date
September 15th in Flagstaff, AZ typically brings pleasant fall weather, with average highs around 74°F and lows near 41°F — a 33°F daily swing. Over 55 years of records, the warmest September 15th was in 2000 (67°F average), while the coldest was 1994 (49°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 16% of September 15th dates historically. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 15th in Flagstaff, AZ? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 35° | 56° | — | — |
| 2024 | 77° | 44° | 61° | — | — |
| 2023 | 70° | 40° | 55° | 0.04" | — |
| 2022 | 72° | 40° | 56° | — | — |
| 2021 | 78° | 47° | 62° | — | — |
| 2020 | 80° | 36° | 58° | — | — |
| 2019 | 73° | 48° | 61° | — | — |
| 2018 | 81° | 44° | 62° | — | — |
| 2017 | 68° | 39° | 54° | — | — |
| 2016 | 71° | 32° | 52° | — | — |
| 2015 | 67° | 53° | 60° | 0.02" | — |
| 2014 | 79° | 48° | 63° | — | — |
| 2013 | 75° | 44° | 60° | 0.02" | — |
| 2012 | 75° | 34° | 54° | — | — |
| 2011 | 63° | 41° | 52° | — | — |
| 2010 | 77° | 45° | 61° | — | — |
| 2009 | 72° | 39° | 55° | — | — |
| 2008 | 77° | 36° | 56° | — | — |
| 2007 | 79° | 45° | 62° | — | — |
| 2006 | 61° | 47° | 54° | — | — |
| 2005 | 71° | 30° | 51° | — | — |
| 2004 | 77° | 41° | 59° | — | — |
| 2003 | 76° | 38° | 57° | — | — |
| 2002 | 73° | 43° | 58° | — | — |
| 2001 | 75° | 48° | 62° | 0.21" | — |
| 2000warmest | 87° | 46° | 67° | — | — |
| 1999 | 68° | 45° | 56° | 0.03" | — |
| 1998 | 77° | 41° | 59° | — | — |
| 1997 | 69° | 52° | 60° | 0.37" | — |
| 1996 | 64° | 35° | 50° | — | — |
| 1995 | 75° | 37° | 56° | — | — |
| 1994coldest | 68° | 31° | 49° | — | — |
| 1993 | 70° | 37° | 53° | — | — |
| 1992 | 78° | 45° | 61° | — | — |
| 1991 | 76° | 42° | 59° | — | — |
| 1990 | 78° | 52° | 65° | — | — |
| 1989 | 78° | 30° | 54° | — | — |
| 1988 | 73° | 31° | 52° | — | — |
| 1987 | 74° | 38° | 56° | — | — |
| 1986 | 72° | 34° | 53° | — | — |
| 1985 | 75° | 46° | 61° | — | — |
| 1984 | 77° | 52° | 64° | 0.01" | — |
| 1983 | 82° | 48° | 65° | — | — |
| 1982 | 69° | 37° | 53° | — | — |
| 1981 | 73° | 44° | 59° | — | — |
| 1980 | 77° | 44° | 61° | — | — |
| 1979 | 62° | 42° | 52° | — | — |
| 1978 | 68° | 48° | 58° | 0.06" | — |
| 1977 | 72° | 39° | 55° | — | — |
| 1976 | 72° | 39° | 55° | — | — |
| 1975 | 77° | 40° | 58° | — | — |
| 1974 | 68° | 33° | 51° | — | — |
| 1973 | 79° | 36° | 57° | — | — |
| 1972 | 78° | 41° | 60° | 0.02" | — |
| 1971 | 79° | 37° | 58° | — | — |
Flagstaff, AZ Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Flagstaff, AZ Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Flagstaff, AZ Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Flagstaff, AZ
Most pleasant months in Flagstaff, AZ: May, June, July, August, September.