Conroe, TX weather in September
Conroe is hot and oppressively humid in September, with some rain: highs average 90°F and nights drop to about 70°F. Rain falls on about 7 days.
- Normal high
- 90°F
- Normal low
- 70°F
- Wet days
- 7
- 3.7 in total
- Muggy days
- 24
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 94°F | 87°F |
| Normal low | 73°F | 66°F |
| Chance of a wet day | 24% | 20% |
| Sunrise / sunset | 6:58 am / 7:45 pm | 7:14 am / 7:08 pm |
| Daylight | 12.8 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am72°Fdew point 69°F
- 9 am80°Fdew point 70°F
- Noon86°Fdew point 68°F
- 3 pm87°Fdew point 67°F
- 6 pm83°Fdew point 69°F
- 9 pm77°Fdew point 70°F
NOAA hourly normals (local standard time) from Houston Intercont Airport (24 mi away); average wind 6 mph; clear or few clouds in 24% of daytime hours, mostly cloudy or overcast in 44%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 30
- Hot dayshigh 90°F or more18 of 30
- Muggy daysdaily mean dew point 65°F or more24 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in5 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.7 in; a dry September brings about 1.9 in and a wet one about 5.1 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202011: average high 94°F
- Coolest September2009: average high 84°F
- Wettest September2008: 10.1 in
- Driest September2007: 0.7 in
- Highest reading109°F (September 4, 2000)
- Lowest reading48°F (September 25, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 96°F | 90°F | 82°F |
| Normal low | 74°F | 70°F | 60°F |
| Wet days | 7 | 7 | 6 |
| Comfortable days | 0 | 1 | 7 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -6°F from August and -8°F into October.
How Conroe ranks in September
- Normal high43rd warmest of 378 cities; 10th of 38 in Texas
- Wet days127th driest of 378
- Comfortable days283rd most of 342
What to pack for Conroe in September
- Light, breathable clothing – highs near 90°F and about 24 muggy days
Heating and cooling
September has 1 heating degree days and 457 cooling degree days (base 65°F), 10% of the year's total heating and cooling demand.
Questions
How hot is Conroe in September?
The normal high is 90°F and the normal low is 70°F. From 1991 to 2020 the hottest September reading was 109°F (September 4, 2000).
Does it rain a lot in Conroe in September?
About 7 days in September have at least 0.01 in of precipitation, and the normal total is 3.7 in. The wettest September in 1991-2020 was in 2008 (10.1 in); the driest was in 2007 (0.7 in).
Is September a good time to visit Conroe?
September ranks 9th of 12 months on our comfort score for Conroe (39 out of 100). It has about 1 comfortable day and about 18 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature, rain and frost dates: Conroe (USC00411956), 2.0 mi NW of the city center, 245 ft . NOAA normals and daily records, 1991-2020.
- Snowfall, snow depth, humidity and wind by hour and cloud cover: Houston Intercont Airport (USW00012960), 24 mi SSE of the city center, 95 ft (122 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: G Bush Intercontinental Airport/Houston Airport (722430-12960), 23 mi SSE of the city center, 90 ft (127 ft lower than the city). Hourly observations, 1991-2020.