Conroe weather in September: Conroe, Texas: normal highs, lows, rain and records for September
Conroe in September has a normal high of 90°F and a normal low of 66°F, a daily mean of 78°F, falling from 93°F on the 1st to 87°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.60 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 19°C, 91 mm of precipitation in September.
- NOAA stationConroe Montgomery County Airport
- Station IDUSW00053902
- Location30.36°N 95.41°W
- Elevation245 ft (75 m)
- Population114,581
- Jan 62° 39°
- Feb 66° 43°
- Mar 73° 49°
- Apr 79° 55°
- May 86° 64°
- Jun 91° 70°
- Jul 94° 72°
- Aug 95° 72°
- Sep 90° 66°
- Oct 82° 56°
- Nov 71° 47°
- Dec 64° 41°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Conroe in September?
The normal high is 90°F and the normal low 66°F, for a daily mean of 78.0°F. September is 5.1°F cooler than August and 9.1°F warmer than October. September is the 4th warmest month of the year in Conroe and the 8th wettest. Across the month the normal high falls 6°F, from 93°F on September 1 to 87°F on September 30. From one year to the next September's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 76°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 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 93°F | 70°F | 34% | 18% |
| September 8 | 91°F | 68°F | 35% | 18% |
| September 15 | 90°F | 67°F | 35% | 18% |
| September 22 | 88°F | 65°F | 35% | 17% |
| September 30 | 87°F | 62°F | 35% | 16% |
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 | 34% | 18% | 12 h 50 min |
| September 2 | 92°F | 70°F | 34% | 18% | 12 h 50 min |
| September 3 | 92°F | 69°F | 34% | 18% | 12 h 40 min |
| September 4 | 92°F | 69°F | 35% | 18% | 12 h 40 min |
| September 5 | 92°F | 69°F | 35% | 18% | 12 h 40 min |
| September 6 | 92°F | 69°F | 35% | 18% | 12 h 40 min |
| September 7 | 91°F | 69°F | 35% | 18% | 12 h 40 min |
| September 8 | 91°F | 68°F | 35% | 18% | 12 h 40 min |
| September 9 | 91°F | 68°F | 36% | 18% | 12 h 30 min |
| September 10 | 91°F | 68°F | 36% | 18% | 12 h 30 min |
| September 11 | 91°F | 68°F | 36% | 18% | 12 h 30 min |
| September 12 | 90°F | 68°F | 36% | 18% | 12 h 30 min |
| September 13 | 90°F | 67°F | 36% | 18% | 12 h 30 min |
| September 14 | 90°F | 67°F | 36% | 18% | 12 h 30 min |
| September 15 | 90°F | 67°F | 35% | 18% | 12 h 20 min |
| September 16 | 90°F | 67°F | 35% | 18% | 12 h 20 min |
| September 17 | 89°F | 66°F | 35% | 18% | 12 h 20 min |
| September 18 | 89°F | 66°F | 35% | 18% | 12 h 20 min |
| September 19 | 89°F | 66°F | 35% | 17% | 12 h 20 min |
| September 20 | 89°F | 65°F | 35% | 17% | 12 h 10 min |
| September 21 | 89°F | 65°F | 35% | 17% | 12 h 10 min |
| September 22 | 88°F | 65°F | 35% | 17% | 12 h 10 min |
| September 23 | 88°F | 65°F | 35% | 17% | 12 h 10 min |
| September 24 | 88°F | 64°F | 35% | 17% | 12 h 10 min |
| September 25 | 88°F | 64°F | 35% | 16% | 12 h 10 min |
| September 26 | 87°F | 64°F | 35% | 16% | 12 h |
| September 27 | 87°F | 63°F | 35% | 16% | 12 h |
| September 28 | 87°F | 63°F | 35% | 16% | 12 h |
| September 29 | 87°F | 63°F | 35% | 16% | 12 h |
| September 30 | 87°F | 62°F | 35% | 16% | 12 h |
- Normal high
- 90°FSeptember average
- Normal low
- 66°FSeptember average
- Precipitation
- 3.60 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 18
- 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
- 28
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053902; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Conroe in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 10 (36%). In all, 3.60 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Conroe, 18 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053902.
What are the records for September in Conroe?
The warmest September temperature on this station's record (since 1997) is 110°F, on September 4, 2000; the coldest is 44°F, on September 23, 1999. The wettest September brought 17.73 in (2019).
The September mean against the 1991-2020 normal of 78.0°F: 2021 76.8°F (−1.2), 2022 77.8°F (−0.3), 2023 82.9°F (+4.9), 2024 79.3°F (+1.3), 2025 79.4°F (+1.4), 2026 83.1°F (+5.1). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.8°F | −1.2°F | 3.84 in |
| 2022 | 77.8°F | −0.3°F | 2.85 in |
| 2023 | 82.9°F | +4.9°F | 2.27 in |
| 2024 | 79.3°F | +1.3°F | 2.49 in |
| 2025 | 79.4°F | +1.4°F | 1.15 in |
| 2026 | 83.1°F | +5.1°F | 3.15 in |
Source: records: ACIS, station USW00053902; recent months: ACIS, station USW00053902. Records and recent months use complete months only.
How does September in Conroe 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; Conroe's is 90°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.