Frisco, TX weather in September
Frisco is hot, often humid and mostly dry in September: highs average 89°F and nights drop to about 67°F. Expect about 6 wet days.
- Normal high
- 89°F
- Normal low
- 67°F
- Wet days
- 6
- 2.9 in total
- Muggy days
- 14
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 93°F | 84°F |
| Normal low | 71°F | 62°F |
| Chance of a wet day | 20% | 19% |
| 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 (21 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°F3 of 30
- Hot dayshigh 90°F or more14 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 2.9 in; a dry September brings about 1.0 in and a wet one about 3.7 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, 1991-20202005: average high 95°F
- Coolest September1991: average high 82°F
- Wettest September2018: 13.2 in
- Driest September2019: no measurable precipitation
- Highest reading111°F (September 4, 2000)
- Lowest reading45°F (September 23, 1995)
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 | 89°F | 78°F |
| Normal low | 74°F | 67°F | 55°F |
| Wet days | 6 | 6 | 7 |
| Comfortable days | 0 | 3 | 12 |
| Daylight | 13.3 h | 12.4 h | 11.3 h |
Highs change by -7°F from August and -11°F into October.
How Frisco ranks in September
- Normal high89th warmest of 378 cities; 28th of 38 in Texas
- Wet days95th driest of 378
- Comfortable days249th most of 342
What to pack for Frisco in September
- Light, breathable clothing – highs near 89°F and about 14 muggy days
Heating and cooling
September has 5 heating degree days and 384 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How hot is Frisco in September?
The normal high is 89°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 Frisco 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 2018 (13.2 in); the driest was in 2019, with no measurable precipitation.
Is September a good time to visit Frisco?
September ranks 9th of 12 months on our comfort score for Frisco (44 out of 100). It has about 3 comfortable days and about 14 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature: Denton 2 Se (USC00412404), 17 mi WNW of the city center, 630 ft (67 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Frisco (USC00413370), 3.4 mi NNE of the city center, 747 ft (50 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Mckinney Muni Airport (USW00053914), 14 mi E of the city center, 580 ft (117 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Dallas Ft Worth Airport (USW00003927), 21 mi SSW of the city center, 560 ft (137 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 SSW of the city center, 544 ft (153 ft lower than the city). Hourly observations, 1991-2020.