McKinney weather in September: McKinney, Texas: normal highs, lows, rain and records for September
McKinney in September has a normal high of 88°F and a normal low of 66°F, a daily mean of 77°F, falling from 93°F on the 1st to 84°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 2.81 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 19°C, 71 mm of precipitation in September.
- NOAA stationMcKinney Municipal Airport
- Station IDUSW00053914
- Location33.18°N 96.59°W
- Elevation580 ft (177 m)
- Population227,526
- Jan 56° 34°
- Feb 60° 38°
- Mar 68° 46°
- Apr 75° 53°
- May 83° 62°
- Jun 91° 70°
- Jul 95° 74°
- Aug 96° 73°
- Sep 88° 66°
- Oct 78° 54°
- Nov 66° 44°
- Dec 57° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is McKinney in September?
The normal high is 88°F and the normal low 66°F, for a daily mean of 76.9°F. September is 7.4°F cooler than August and 10.9°F warmer than October. September is the 4th warmest month of the year in McKinney and the 8th wettest. Across the month the normal high falls 9°F, from 93°F on September 1 to 84°F on September 30. From one year to the next September's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 74°F and 80°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 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 93°F | 70°F | 22% | 12% |
| September 8 | 91°F | 68°F | 22% | 13% |
| September 15 | 89°F | 66°F | 23% | 13% |
| September 22 | 86°F | 63°F | 23% | 13% |
| September 30 | 84°F | 60°F | 24% | 14% |
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 | 93°F | 70°F | 22% | 12% | 12 h 50 min |
| September 2 | 92°F | 70°F | 22% | 12% | 12 h 50 min |
| September 3 | 92°F | 70°F | 22% | 12% | 12 h 50 min |
| September 4 | 92°F | 69°F | 22% | 12% | 12 h 50 min |
| September 5 | 91°F | 69°F | 22% | 12% | 12 h 50 min |
| September 6 | 91°F | 69°F | 22% | 12% | 12 h 40 min |
| September 7 | 91°F | 68°F | 22% | 13% | 12 h 40 min |
| September 8 | 91°F | 68°F | 22% | 13% | 12 h 40 min |
| September 9 | 90°F | 68°F | 23% | 13% | 12 h 40 min |
| September 10 | 90°F | 68°F | 23% | 13% | 12 h 40 min |
| September 11 | 90°F | 67°F | 23% | 13% | 12 h 30 min |
| September 12 | 89°F | 67°F | 23% | 13% | 12 h 30 min |
| September 13 | 89°F | 67°F | 23% | 13% | 12 h 30 min |
| September 14 | 89°F | 66°F | 23% | 13% | 12 h 30 min |
| September 15 | 89°F | 66°F | 23% | 13% | 12 h 30 min |
| September 16 | 88°F | 66°F | 23% | 13% | 12 h 20 min |
| September 17 | 88°F | 65°F | 23% | 13% | 12 h 20 min |
| September 18 | 88°F | 65°F | 23% | 13% | 12 h 20 min |
| September 19 | 87°F | 64°F | 23% | 13% | 12 h 20 min |
| September 20 | 87°F | 64°F | 23% | 13% | 12 h 20 min |
| September 21 | 87°F | 64°F | 23% | 13% | 12 h 10 min |
| September 22 | 86°F | 63°F | 23% | 13% | 12 h 10 min |
| September 23 | 86°F | 63°F | 23% | 13% | 12 h 10 min |
| September 24 | 86°F | 63°F | 23% | 13% | 12 h 10 min |
| September 25 | 86°F | 62°F | 23% | 13% | 12 h 10 min |
| September 26 | 85°F | 62°F | 23% | 13% | 12 h |
| September 27 | 85°F | 61°F | 23% | 13% | 12 h |
| September 28 | 85°F | 61°F | 23% | 14% | 12 h |
| September 29 | 84°F | 61°F | 23% | 14% | 12 h |
| September 30 | 84°F | 60°F | 24% | 14% | 12 h |
- Normal high
- 88°FSeptember average
- Normal low
- 66°FSeptember average
- Precipitation
- 2.81 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 15
- 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
- 27
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053914; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in McKinney in September?
On a given September day the chance of 0.01 inch or more is 23% on average, highest around September 30 (24%). In all, 2.81 in falls on 7 days of a normal September, 1 of them with an inch or more.
In a normal September in McKinney, 15 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053914.
What are the records for September in McKinney?
The warmest September temperature on this station's record (since 1998) is 112°F, on September 4, 2000; the coldest is 41°F, on September 26, 2000. The wettest September brought 12.44 in (2018).
The September mean against the 1991-2020 normal of 76.9°F: 2021 78.3°F (+1.4), 2022 78.3°F (+1.3), 2023 81.6°F (+4.7), 2024 78.2°F (+1.3), 2025 78.3°F (+1.4), 2026 85.4°F (+8.5). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.3°F | +1.4°F | 0.31 in |
| 2022 | 78.3°F | +1.3°F | 0.38 in |
| 2023 | 81.6°F | +4.7°F | 1.35 in |
| 2024 | 78.2°F | +1.3°F | 2.24 in |
| 2025 | 78.3°F | +1.4°F | 3.02 in |
| 2026 | 85.4°F | +8.5°F | 1.09 in |
Source: records: ACIS, station USW00053914; recent months: ACIS, station USW00053914. Records and recent months use complete months only.
How does September in McKinney compare across Texas?
Across the 321 places PlainClimate covers in Texas, September normal highs run from 81°F in Hart to 95°F in Presidio; McKinney's is 88°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.