Phoenix weather in September: Phoenix, Arizona: normal highs, lows, rain and records for September
Phoenix in September has a normal high of 100°F and a normal low of 78°F, a daily mean of 89°F, falling from 104°F on the 1st to 96°F by the 30th. Measurable precipitation falls on 3 days in a normal September, 0.57 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 38°C and low of 26°C, 14 mm of precipitation in September.
- NOAA stationPhoenix Sky Harbor International Airport
- Station IDUSW00023183
- Location33.43°N 112.00°W
- Elevation1,107 ft (337 m)
- From the center11 miles
- Population1,673,164
- Jan 68° 46°
- Feb 71° 49°
- Mar 78° 55°
- Apr 86° 61°
- May 95° 70°
- Jun 104° 79°
- Jul 107° 85°
- Aug 105° 84°
- Sep 100° 78°
- Oct 89° 66°
- Nov 77° 54°
- Dec 66° 45°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Phoenix in September?
The normal high is 100°F and the normal low 78°F, for a daily mean of 89.2°F. September is 5.2°F cooler than August and 11.8°F warmer than October. September is the 4th warmest month of the year in Phoenix and the 7th wettest. Across the month the normal high falls 8°F, from 104°F on September 1 to 96°F on September 30. From one year to the next September's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 87°F and 91°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 13%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 104°F | 82°F | 13% | 6% |
| September 8 | 103°F | 81°F | 11% | 5% |
| September 15 | 101°F | 79°F | 9% | 4% |
| September 22 | 99°F | 76°F | 8% | 4% |
| September 30 | 96°F | 73°F | 7% | 3% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 104°F | 82°F | 13% | 6% | 12 h 50 min |
| September 2 | 104°F | 82°F | 12% | 6% | 12 h 50 min |
| September 3 | 104°F | 82°F | 12% | 6% | 12 h 50 min |
| September 4 | 104°F | 82°F | 12% | 6% | 12 h 50 min |
| September 5 | 103°F | 81°F | 12% | 6% | 12 h 50 min |
| September 6 | 103°F | 81°F | 11% | 6% | 12 h 40 min |
| September 7 | 103°F | 81°F | 11% | 6% | 12 h 40 min |
| September 8 | 103°F | 81°F | 11% | 5% | 12 h 40 min |
| September 9 | 103°F | 81°F | 11% | 5% | 12 h 40 min |
| September 10 | 102°F | 80°F | 11% | 5% | 12 h 40 min |
| September 11 | 102°F | 80°F | 10% | 5% | 12 h 30 min |
| September 12 | 102°F | 80°F | 10% | 5% | 12 h 30 min |
| September 13 | 102°F | 79°F | 10% | 5% | 12 h 30 min |
| September 14 | 101°F | 79°F | 10% | 4% | 12 h 30 min |
| September 15 | 101°F | 79°F | 9% | 4% | 12 h 30 min |
| September 16 | 101°F | 78°F | 9% | 4% | 12 h 20 min |
| September 17 | 100°F | 78°F | 9% | 4% | 12 h 20 min |
| September 18 | 100°F | 78°F | 9% | 4% | 12 h 20 min |
| September 19 | 100°F | 77°F | 8% | 4% | 12 h 20 min |
| September 20 | 99°F | 77°F | 8% | 4% | 12 h 20 min |
| September 21 | 99°F | 77°F | 8% | 4% | 12 h 10 min |
| September 22 | 99°F | 76°F | 8% | 4% | 12 h 10 min |
| September 23 | 98°F | 76°F | 8% | 4% | 12 h 10 min |
| September 24 | 98°F | 75°F | 8% | 3% | 12 h 10 min |
| September 25 | 97°F | 75°F | 8% | 3% | 12 h 10 min |
| September 26 | 97°F | 74°F | 7% | 3% | 12 h |
| September 27 | 97°F | 74°F | 7% | 3% | 12 h |
| September 28 | 96°F | 74°F | 7% | 3% | 12 h |
| September 29 | 96°F | 73°F | 7% | 3% | 12 h |
| September 30 | 96°F | 73°F | 7% | 3% | 11 h 50 min |
- Normal high
- 100°FSeptember average
- Normal low
- 78°FSeptember average
- Precipitation
- 0.57 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 28
- Daylight
- 12 h 50 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 30
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023183; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Phoenix in September?
On a given September day the chance of 0.01 inch or more is 9% on average, highest around September 1 (13%). In all, 0.57 in falls on 3 days of a normal September.
In a normal September in Phoenix, 28 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023183.
How humid and windy is Phoenix in September?
At 3 p.m. the normal temperature is 95°F with 16% relative humidity and a dew point of 42°F; at 6 a.m. it is 74°F with 38% humidity. The wind averages 5.8 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 74°F | 47°F | 38% | 5.2 mph | 72% |
| 9 a.m. | 81°F | 46°F | 29% | 7.0 mph | 71% |
| noon | 90°F | 45°F | 20% | 6.3 mph | 66% |
| 3 p.m. | 95°F | 42°F | 16% | 7.1 mph | 64% |
| 6 p.m. | 93°F | 41°F | 17% | 7.7 mph | 63% |
| 9 p.m. | 86°F | 44°F | 24% | 4.3 mph | 74% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023183. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Phoenix?
The warmest September temperature on Phoenix's official record (since 1895) is 117°F, on September 28, 2024; the coldest is 47°F, on September 22, 1895. The wettest September brought 5.41 in (1939).
The September mean against the 1991-2020 normal of 89.2°F: 2021 89.2°F (at normal), 2022 91.1°F (+1.9), 2023 91.2°F (+2.0), 2024 94.5°F (+5.3), 2025 90.2°F (+1.0), 2026 90.6°F (+1.4). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 89.2°F | at normal | 0.76 in |
| 2022 | 91.1°F | +1.9°F | 0.79 in |
| 2023 | 91.2°F | +2.0°F | 0.03 in |
| 2024 | 94.5°F | +5.3°F | 0.00 in |
| 2025 | 90.2°F | +1.0°F | 2.26 in |
| 2026 | 90.6°F | +1.4°F | 1.05 in |
Source: records: ACIS, NWS threaded record PHXthr; recent months: ACIS, station USW00023183. Records and recent months use complete months only.
How does September in Phoenix compare across Arizona?
Across the 97 places PlainClimate covers in Arizona, September normal highs run from 70°F in Greer to 104°F in Tacna; Phoenix's is 100°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.