Casa Grande weather in September: Casa Grande, Arizona: normal highs, lows, rain and records for September
Casa Grande in September has a normal high of 100°F and a normal low of 71°F, a daily mean of 86°F, falling from 104°F on the 1st to 96°F by the 30th. Measurable precipitation falls on 3 days in a normal September, 0.72 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 38°C and low of 22°C, 18 mm of precipitation in September.
- NOAA stationCasa Grande
- Station IDUSC00021306
- Location32.89°N 111.71°W
- Elevation1,400 ft (427 m)
- From the center3 miles
- Population68,927
- Jan 69° 39°
- Feb 73° 42°
- Mar 80° 47°
- Apr 88° 53°
- May 96° 60°
- Jun 106° 70°
- Jul 107° 78°
- Aug 105° 77°
- Sep 100° 71°
- Oct 91° 57°
- Nov 78° 45°
- Dec 68° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Casa Grande in September?
The normal high is 100°F and the normal low 71°F, for a daily mean of 85.5°F. September is 5.8°F cooler than August and 11.7°F warmer than October. September is the 4th warmest month of the year in Casa Grande 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 1.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 84°F and 87°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 12%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 104°F | 75°F | 12% | 7% |
| September 8 | 103°F | 74°F | 11% | 6% |
| September 15 | 101°F | 71°F | 9% | 5% |
| September 22 | 99°F | 68°F | 7% | 4% |
| September 30 | 96°F | 65°F | 6% | 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 | 75°F | 12% | 7% | 12 h 50 min |
| September 2 | 104°F | 75°F | 12% | 7% | 12 h 50 min |
| September 3 | 104°F | 75°F | 12% | 7% | 12 h 50 min |
| September 4 | 103°F | 75°F | 12% | 7% | 12 h 50 min |
| September 5 | 103°F | 75°F | 11% | 7% | 12 h 50 min |
| September 6 | 103°F | 74°F | 11% | 6% | 12 h 40 min |
| September 7 | 103°F | 74°F | 11% | 6% | 12 h 40 min |
| September 8 | 103°F | 74°F | 11% | 6% | 12 h 40 min |
| September 9 | 102°F | 73°F | 10% | 6% | 12 h 40 min |
| September 10 | 102°F | 73°F | 10% | 6% | 12 h 40 min |
| September 11 | 102°F | 73°F | 10% | 5% | 12 h 30 min |
| September 12 | 102°F | 72°F | 9% | 5% | 12 h 30 min |
| September 13 | 101°F | 72°F | 9% | 5% | 12 h 30 min |
| September 14 | 101°F | 72°F | 9% | 5% | 12 h 30 min |
| September 15 | 101°F | 71°F | 9% | 5% | 12 h 30 min |
| September 16 | 101°F | 71°F | 8% | 4% | 12 h 20 min |
| September 17 | 100°F | 71°F | 8% | 4% | 12 h 20 min |
| September 18 | 100°F | 70°F | 8% | 4% | 12 h 20 min |
| September 19 | 100°F | 70°F | 8% | 4% | 12 h 20 min |
| September 20 | 99°F | 69°F | 7% | 4% | 12 h 20 min |
| September 21 | 99°F | 69°F | 7% | 4% | 12 h 10 min |
| September 22 | 99°F | 68°F | 7% | 4% | 12 h 10 min |
| September 23 | 98°F | 68°F | 7% | 4% | 12 h 10 min |
| September 24 | 98°F | 68°F | 7% | 3% | 12 h 10 min |
| September 25 | 98°F | 67°F | 7% | 3% | 12 h 10 min |
| September 26 | 97°F | 67°F | 6% | 3% | 12 h |
| September 27 | 97°F | 66°F | 6% | 3% | 12 h |
| September 28 | 97°F | 66°F | 6% | 3% | 12 h |
| September 29 | 96°F | 65°F | 6% | 3% | 12 h |
| September 30 | 96°F | 65°F | 6% | 3% | 12 h |
- Normal high
- 100°FSeptember average
- Normal low
- 71°FSeptember average
- Precipitation
- 0.72 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 30
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 30
- Sunshine
- 92%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00021306; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Casa Grande in September?
On a given September day the chance of 0.01 inch or more is 9% on average, highest around September 1 (12%). In all, 0.72 in falls on 3 days of a normal September.
In a normal September in Casa Grande, 30 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00021306.
What are the records for September in Casa Grande?
The warmest September temperature on this station's record (since 1903) is 116°F, on September 2, 1950; the coldest is 40°F, on September 30, 1908. The wettest September brought 5.35 in (1946).
The September mean against the 1991-2020 normal of 85.5°F: 2021 86.1°F (+0.6), 2022 87.3°F (+1.8), 2023 85.5°F (at normal), 2024 88.0°F (+2.5), 2026 87.3°F (+1.8). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 86.1°F | +0.6°F | 0.84 in |
| 2022 | 87.3°F | +1.8°F | 0.86 in |
| 2023 | 85.5°F | at normal | 0.15 in |
| 2024 | 88.0°F | +2.5°F | 0.00 in |
| 2026 | 87.3°F | +1.8°F | 1.36 in |
Source: records: ACIS, station USC00021306; recent months: ACIS, station USC00021306. Records and recent months use complete months only.
How does September in Casa Grande 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; Casa Grande's is 100°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Casa Grande in August105°F by day, 77°F at night
- Casa Grande in October91°F by day, 57°F at night
- Casa Grande through the yearEvery month, frost dates, records and recent years
- Arizona in SeptemberThe statewide normal and the warmest and coolest places
- Tacna: Arizona's warmest Septembernormal high 104°F