Plano, TX weather in September
Plano is hot, often humid and mostly dry in September: highs average 90°F and nights drop to about 70°F. Rain falls on about 6 days.
- Normal high
- 90°F
- Normal low
- 70°F
- Wet days
- 6
- 3.3 in total
- Muggy days
- 14
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 94°F | 86°F |
| Normal low | 75°F | 65°F |
| Chance of a wet day | 20% | 20% |
| Sunrise / sunset | 7:01 am / 7:52 pm | 7:20 am / 7:13 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 am71°Fdew point 64°F
- 9 am77°Fdew point 65°F
- Noon85°Fdew point 63°F
- 3 pm87°Fdew point 61°F
- 6 pm85°Fdew point 61°F
- 9 pm78°Fdew point 62°F
NOAA hourly normals (local standard time) from Dallas Ft Worth Airport (20 mi away); average wind 9 mph; clear or few clouds in 39% of daytime hours, mostly cloudy or overcast in 37%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 30
- Hot dayshigh 90°F or more17 of 30
- Muggy daysdaily mean dew point 65°F or more14 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
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.3 in; a dry September brings about 1.3 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 97°F
- Coolest September2003: average high 84°F
- Wettest September2018: 15.6 in
- Driest September2000: 0.1 in
- Highest reading110°F (September 4, 2000)
- Lowest reading46°F (September 28, 1996)
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 | 90°F | 80°F |
| Normal low | 77°F | 70°F | 59°F |
| Wet days | 5 | 6 | 8 |
| Comfortable days | 0 | 2 | 11 |
| Daylight | 13.3 h | 12.4 h | 11.3 h |
Highs change by -7°F from August and -10°F into October.
Nearby alternatives in September
- Cooler: Oklahoma City, OK175 mi · high 84°F · 7 wet days
How Plano ranks in September
- Normal high54th warmest of 378 cities; 16th of 38 in Texas
- Wet days107th driest of 378
- Comfortable days264th most of 342
What to pack for Plano in September
- Light, breathable clothing – highs near 90°F and about 14 muggy days
Heating and cooling
September has 2 heating degree days and 454 cooling degree days (base 65°F), 9% of the year's total heating and cooling demand.
Questions
How hot is Plano in September?
The normal high is 90°F and the normal low is 70°F. From 1991 to 2020 the hottest September reading was 110°F (September 4, 2000).
Does it rain a lot in Plano in September?
About 6 days in September have at least 0.01 in of precipitation, and the normal total is 3.3 in. The wettest September in 1991-2020 was in 2018 (15.6 in); the driest was in 2000 (0.2 in).
Is September a good time to visit Plano?
September ranks 9th of 12 months on our comfort score for Plano (42 out of 100). It has about 2 comfortable days and about 17 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature: Dallas Love Fld (USW00013960), 15 mi SW of the city center, 440 ft (228 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Rain and frost dates: Richardson (USC00417588), 3.0 mi WSW of the city center, 678 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Frisco (USC00413370), 13 mi NNW of the city center, 747 ft (79 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Dallas Ft Worth Airport (USW00003927), 20 mi WSW of the city center, 560 ft (108 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Dallas/Ft Worth International Airport (722590-03927), 21 mi WSW of the city center, 544 ft (124 ft lower than the city). Hourly observations, 1991-2020.