Tucson, AZ weather in September
In September, Tucson sees highs around 95°F and lows around 70°F: hot and mostly dry. There are about 4 days with rain. Plan outdoor time for mornings and evenings.
- Normal high
- 95°F
- Normal low
- 70°F
- Wet days
- 4
- 1.3 in total
- Muggy days
- 2
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 98°F | 91°F |
| Normal low | 74°F | 65°F |
| Chance of a wet day | 21% | 12% |
| Sunrise / sunset | 5:58 am / 6:48 pm | 6:17 am / 6:10 pm |
| Daylight | 12.8 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Arizona time (no daylight saving)).
A typical September day
- 6 am71°Fdew point 53°F
- 9 am81°Fdew point 54°F
- Noon90°Fdew point 51°F
- 3 pm93°Fdew point 48°F
- 6 pm89°Fdew point 48°F
- 9 pm81°Fdew point 51°F
NOAA hourly normals (local standard time) from Davis Monthan AFB (5 mi away); average wind 7 mph; clear or few clouds in 73% of daytime hours, mostly cloudy or overcast in 16%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 30
- Hot dayshigh 90°F or more26 of 30
- Muggy daysdaily mean dew point 65°F or more2 of 30
- Wet daysat least 0.01 in of rain or melted snow4 of 30
- Notable rainat least 0.10 in2 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 1.3 in; a dry September brings about 0.5 in and a wet one about 1.7 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How September varies from year to year
- Warmest September, 1991-20202020: average high 99°F
- Coolest September1996: average high 89°F
- Wettest September2011: 5.6 in
- Driest September2020: no measurable precipitation
- Highest reading110°F (September 4, 2020)
- Lowest reading54°F (September 25, 2017)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 99°F | 95°F | 86°F |
| Normal low | 75°F | 70°F | 59°F |
| Wet days | 9 | 4 | 3 |
| Comfortable days | 0 | 0 | 6 |
| Daylight | 13.3 h | 12.4 h | 11.4 h |
Highs change by -4°F from August and -9°F into October.
Nearby alternatives in September
- Warmer: San Tan Valley, AZ76 mi · high 101°F · 3 wet days
- Cooler: Sedona, AZ189 mi · high 89°F · 5 wet days
How Tucson ranks in September
- Normal high11th warmest of 378 cities; 9th of 13 in Arizona
- Wet days77th driest of 378
- Comfortable days310th most of 342
What to pack for Tucson in September
- Light, breathable clothing – highs near 95°F and about 2 muggy days
- Layers – afternoons near 95°F but nights near 70°F
Heating and cooling
September has 0 heating degree days and 532 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Tucson in September?
The normal high is 95°F and the normal low is 70°F. From 1991 to 2020 the hottest September reading was 110°F (September 4, 2020).
Does it rain a lot in Tucson in September?
About 4 days in September have at least 0.01 in of precipitation, and the normal total is 1.3 in. The wettest September in 1991-2020 was in 2011 (5.6 in); the driest was in 2020, with no measurable precipitation.
Is September a good time to visit Tucson?
September ranks 11th of 12 months on our comfort score for Tucson (34 out of 100). It has almost no comfortable days and about 26 days at 90°F or hotter. The best months are January, February and March.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Tucson Intl Airport (USW00023160), 6.5 mi SSW of the city center, 2,549 ft (68 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Davis Monthan AFB (USW00023109), 4.6 mi SSE of the city center, 2,654 ft (173 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Tucson International Airport (722740-23160), 6.4 mi SSW of the city center, 2,551 ft (70 ft higher than the city). Hourly observations, 1991-2020.