Waco, TX weather in September
Waco is hot, often humid and mostly dry in September: highs average 91°F and nights drop to about 67°F. Expect about 6 wet days.
- Normal high
- 91°F
- Normal low
- 67°F
- Wet days
- 6
- 2.9 in total
- Muggy days
- 17
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 95°F | 87°F |
| Normal low | 71°F | 62°F |
| Chance of a wet day | 20% | 18% |
| Sunrise / sunset | 7:04 am / 7:52 pm | 7:21 am / 7:15 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 am69°Fdew point 65°F
- 9 am78°Fdew point 66°F
- Noon86°Fdew point 64°F
- 3 pm89°Fdew point 62°F
- 6 pm85°Fdew point 62°F
- 9 pm77°Fdew point 64°F
NOAA hourly normals (local standard time) from Waco Rgnl Airport (7 mi away); average wind 8 mph; clear or few clouds in 68% of daytime hours, mostly cloudy or overcast in 21%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 30
- Hot dayshigh 90°F or more19 of 30
- Muggy daysdaily mean dew point 65°F or more17 of 30
- Wet daysat least 0.01 in of rain or melted snow6 of 30
- Notable rainat least 0.10 in4 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 2.9 in; a dry September brings about 0.6 in and a wet one about 4.4 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, 1991-20202019: average high 98°F
- Coolest September2020: average high 85°F
- Wettest September2010: 9.5 in
- Driest September2019: 0.2 in
- Highest reading111°F (September 4, 2000)
- Lowest reading44°F (September 26, 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 | 97°F | 91°F | 81°F |
| Normal low | 74°F | 67°F | 56°F |
| Wet days | 5 | 6 | 7 |
| Comfortable days | 0 | 1 | 9 |
| Daylight | 13.3 h | 12.3 h | 11.4 h |
Highs change by -6°F from August and -10°F into October.
How Waco ranks in September
- Normal high37th warmest of 378 cities; 9th of 38 in Texas
- Wet days102nd driest of 378
- Comfortable days284th most of 342
What to pack for Waco in September
- Light, breathable clothing – highs near 91°F and about 17 muggy days
Heating and cooling
September has 3 heating degree days and 416 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How hot is Waco in September?
The normal high is 91°F and the normal low is 67°F. From 1991 to 2020 the hottest September reading was 111°F (September 4, 2000).
Does it rain a lot in Waco in September?
About 6 days in September have at least 0.01 in of precipitation, and the normal total is 2.9 in. The wettest September in 1991-2020 was in 2010 (9.5 in); the driest was in 2019 (0.2 in).
Is September a good time to visit Waco?
September ranks 10th of 12 months on our comfort score for Waco (39 out of 100). It has about 1 comfortable day and about 19 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Waco Rgnl Airport (USW00013959), 6.8 mi NW of the city center, 500 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Waco Regional Airport (722560-13959), 6.7 mi NW of the city center, 498 ft . Hourly observations, 1991-2020.