McAllen weather in September: McAllen, Texas: normal highs, lows, rain and records for September
McAllen in September has a normal high of 94°F and a normal low of 76°F, a daily mean of 85°F, falling from 97°F on the 1st to 92°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 4.61 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 35°C and low of 24°C, 117 mm of precipitation in September.
- NOAA stationMcAllen Miller International Airport
- Station IDUSW00012959
- Location26.18°N 98.25°W
- Elevation100 ft (31 m)
- From the center3 miles
- Population148,782
- Jan 73° 53°
- Feb 77° 57°
- Mar 83° 63°
- Apr 88° 68°
- May 93° 74°
- Jun 97° 78°
- Jul 99° 79°
- Aug 100° 79°
- Sep 94° 76°
- Oct 89° 69°
- Nov 80° 60°
- Dec 74° 54°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is McAllen in September?
The normal high is 94°F and the normal low 76°F, for a daily mean of 85.0°F. September is 4.3°F cooler than August and 6.0°F warmer than October. September is the 4th warmest month of the year in McAllen and the wettest. Across the month the normal high falls 5°F, from 97°F on September 1 to 92°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 83°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 26%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 97°F | 78°F | 24% | 16% |
| September 8 | 95°F | 77°F | 26% | 18% |
| September 15 | 94°F | 76°F | 26% | 18% |
| September 22 | 93°F | 75°F | 25% | 17% |
| September 30 | 92°F | 73°F | 22% | 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 | 97°F | 78°F | 24% | 16% | 12 h 40 min |
| September 2 | 97°F | 78°F | 25% | 16% | 12 h 40 min |
| September 3 | 97°F | 78°F | 25% | 17% | 12 h 40 min |
| September 4 | 96°F | 77°F | 25% | 17% | 12 h 40 min |
| September 5 | 96°F | 77°F | 25% | 17% | 12 h 40 min |
| September 6 | 96°F | 77°F | 26% | 17% | 12 h 30 min |
| September 7 | 96°F | 77°F | 26% | 17% | 12 h 30 min |
| September 8 | 95°F | 77°F | 26% | 18% | 12 h 30 min |
| September 9 | 95°F | 77°F | 26% | 18% | 12 h 30 min |
| September 10 | 95°F | 77°F | 26% | 18% | 12 h 30 min |
| September 11 | 95°F | 77°F | 26% | 18% | 12 h 30 min |
| September 12 | 95°F | 76°F | 26% | 18% | 12 h 30 min |
| September 13 | 95°F | 76°F | 26% | 18% | 12 h 20 min |
| September 14 | 94°F | 76°F | 26% | 18% | 12 h 20 min |
| September 15 | 94°F | 76°F | 26% | 18% | 12 h 20 min |
| September 16 | 94°F | 76°F | 26% | 18% | 12 h 20 min |
| September 17 | 94°F | 76°F | 26% | 18% | 12 h 20 min |
| September 18 | 94°F | 75°F | 26% | 18% | 12 h 20 min |
| September 19 | 94°F | 75°F | 26% | 17% | 12 h 10 min |
| September 20 | 93°F | 75°F | 25% | 17% | 12 h 10 min |
| September 21 | 93°F | 75°F | 25% | 17% | 12 h 10 min |
| September 22 | 93°F | 75°F | 25% | 17% | 12 h 10 min |
| September 23 | 93°F | 74°F | 24% | 17% | 12 h 10 min |
| September 24 | 93°F | 74°F | 24% | 16% | 12 h 10 min |
| September 25 | 93°F | 74°F | 24% | 16% | 12 h 10 min |
| September 26 | 93°F | 74°F | 24% | 16% | 12 h |
| September 27 | 93°F | 74°F | 23% | 15% | 12 h |
| September 28 | 93°F | 73°F | 23% | 15% | 12 h |
| September 29 | 92°F | 73°F | 23% | 15% | 12 h |
| September 30 | 92°F | 73°F | 22% | 14% | 12 h |
- Normal high
- 94°FSeptember average
- Normal low
- 76°FSeptember average
- Precipitation
- 4.61 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 24
- Daylight
- 12 h 40 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 30
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012959; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in McAllen in September?
On a given September day the chance of 0.01 inch or more is 25% on average, highest around September 11 (26%). In all, 4.61 in falls on 8 days of a normal September, 2 of them with an inch or more.
In a normal September in McAllen, 24 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012959.
How humid and windy is McAllen in September?
At 3 p.m. the normal temperature is 89°F with 46% relative humidity and a dew point of 66°F; at 6 a.m. it is 73°F with 88% humidity. The wind averages 8.2 mph, most often from the east in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 73°F | 69°F | 88% | 5.5 mph | 79% |
| 9 a.m. | 80°F | 70°F | 72% | 8.7 mph | 75% |
| noon | 87°F | 67°F | 52% | 9.9 mph | 58% |
| 3 p.m. | 89°F | 66°F | 46% | 10.9 mph | 65% |
| 6 p.m. | 85°F | 67°F | 54% | 11.7 mph | 84% |
| 9 p.m. | 79°F | 69°F | 72% | 8.6 mph | 89% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00012959. 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 McAllen?
The warmest September temperature on McAllen's official record (since 1941) is 108°F, on September 4, 2011; the coldest is 50°F, on September 28, 1942. The wettest September brought 11.23 in (2014).
The September mean against the 1991-2020 normal of 85.0°F: 2021 85.1°F (+0.1), 2022 83.7°F (−1.3), 2023 89.3°F (+4.3), 2024 85.9°F (+0.9), 2025 87.5°F (+2.5), 2026 92.0°F (+7.0). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 85.1°F | +0.1°F | 1.97 in |
| 2022 | 83.7°F | −1.3°F | 3.83 in |
| 2023 | 89.3°F | +4.3°F | 0.66 in |
| 2024 | 85.9°F | +0.9°F | 5.28 in |
| 2025 | 87.5°F | +2.5°F | 0.27 in |
| 2026 | 92.0°F | +7.0°F | 0.25 in |
Source: records: ACIS, NWS threaded record MFEthr; recent months: ACIS, station USW00012959. Records and recent months use complete months only.
How does September in McAllen 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; McAllen's is 94°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.