Harlingen weather in September: Harlingen, Texas: normal highs, lows, rain and records for September
Harlingen in September has a normal high of 92°F and a normal low of 73°F, a daily mean of 82°F, falling from 95°F on the 1st to 90°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 5.31 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 23°C, 135 mm of precipitation in September.
- NOAA stationHarlingen Rio Grande Airport
- Station IDUSW00012904
- Location26.23°N 97.65°W
- Elevation34 ft (10 m)
- Population72,234
- Jan 72° 50°
- Feb 76° 54°
- Mar 81° 59°
- Apr 87° 65°
- May 91° 71°
- Jun 95° 75°
- Jul 96° 75°
- Aug 97° 75°
- Sep 92° 73°
- Oct 88° 66°
- Nov 79° 57°
- Dec 73° 52°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Harlingen in September?
The normal high is 92°F and the normal low 73°F, for a daily mean of 82.3°F. September is 3.9°F cooler than August and 5.7°F warmer than October. September is the 4th warmest month of the year in Harlingen and the wettest. Across the month the normal high falls 5°F, from 95°F on September 1 to 90°F on September 30. From one year to the next September's mean temperature typically moves about 1.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 81°F and 84°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 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 95°F | 74°F | 31% | 19% |
| September 8 | 93°F | 74°F | 34% | 22% |
| September 15 | 92°F | 73°F | 36% | 22% |
| September 22 | 91°F | 72°F | 35% | 21% |
| September 30 | 90°F | 70°F | 33% | 18% |
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 | 95°F | 74°F | 31% | 19% | 12 h 40 min |
| September 2 | 95°F | 74°F | 31% | 20% | 12 h 40 min |
| September 3 | 94°F | 74°F | 32% | 20% | 12 h 40 min |
| September 4 | 94°F | 74°F | 32% | 21% | 12 h 40 min |
| September 5 | 94°F | 74°F | 33% | 21% | 12 h 40 min |
| September 6 | 94°F | 74°F | 33% | 21% | 12 h 30 min |
| September 7 | 94°F | 74°F | 34% | 21% | 12 h 30 min |
| September 8 | 93°F | 74°F | 34% | 22% | 12 h 30 min |
| September 9 | 93°F | 74°F | 35% | 22% | 12 h 30 min |
| September 10 | 93°F | 73°F | 35% | 22% | 12 h 30 min |
| September 11 | 93°F | 73°F | 35% | 22% | 12 h 30 min |
| September 12 | 93°F | 73°F | 35% | 22% | 12 h 30 min |
| September 13 | 92°F | 73°F | 35% | 22% | 12 h 20 min |
| September 14 | 92°F | 73°F | 35% | 22% | 12 h 20 min |
| September 15 | 92°F | 73°F | 36% | 22% | 12 h 20 min |
| September 16 | 92°F | 73°F | 36% | 22% | 12 h 20 min |
| September 17 | 92°F | 72°F | 35% | 22% | 12 h 20 min |
| September 18 | 92°F | 72°F | 35% | 22% | 12 h 20 min |
| September 19 | 92°F | 72°F | 35% | 22% | 12 h 10 min |
| September 20 | 91°F | 72°F | 35% | 21% | 12 h 10 min |
| September 21 | 91°F | 72°F | 35% | 21% | 12 h 10 min |
| September 22 | 91°F | 72°F | 35% | 21% | 12 h 10 min |
| September 23 | 91°F | 71°F | 34% | 21% | 12 h 10 min |
| September 24 | 91°F | 71°F | 34% | 20% | 12 h 10 min |
| September 25 | 91°F | 71°F | 34% | 20% | 12 h 10 min |
| September 26 | 91°F | 71°F | 34% | 20% | 12 h |
| September 27 | 91°F | 71°F | 33% | 19% | 12 h |
| September 28 | 91°F | 70°F | 33% | 19% | 12 h |
| September 29 | 90°F | 70°F | 33% | 18% | 12 h |
| September 30 | 90°F | 70°F | 33% | 18% | 12 h |
- Normal high
- 92°FSeptember average
- Normal low
- 73°FSeptember average
- Precipitation
- 5.31 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 22
- 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
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012904; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Harlingen in September?
On a given September day the chance of 0.01 inch or more is 34% on average, highest around September 15 (36%). In all, 5.31 in falls on 11 days of a normal September, 2 of them with an inch or more.
In a normal September in Harlingen, 22 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012904.
What are the records for September in Harlingen?
The warmest September temperature on this station's record (since 1952) is 107°F, on September 4, 2011; the coldest is 57°F, on September 30, 2020. The wettest September brought 12.77 in (2018).
The September mean against the 1991-2020 normal of 82.3°F: 2021 83.4°F (+1.1), 2022 81.8°F (−0.5), 2023 86.3°F (+4.0), 2024 82.6°F (+0.3), 2025 83.5°F (+1.2), 2026 88.2°F (+5.9). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 83.4°F | +1.1°F | 1.19 in |
| 2022 | 81.8°F | −0.5°F | 2.53 in |
| 2023 | 86.3°F | +4.0°F | 2.95 in |
| 2024 | 82.6°F | +0.3°F | 8.10 in |
| 2025 | 83.5°F | +1.2°F | 3.21 in |
| 2026 | 88.2°F | +5.9°F | 0.05 in |
Source: records: ACIS, station USW00012904; recent months: ACIS, station USW00012904. Records and recent months use complete months only.
How does September in Harlingen 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; Harlingen's is 92°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.