Galveston, TX weather in September
Expect hot, oppressively humid weather with some rain in Galveston in September, with highs near 89°F and lows near 76°F. Rain falls on about 10 days.
- Normal high
- 89°F
- Normal low
- 76°F
- Wet days
- 10
- 6.7 in total
- Muggy days
- 27
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 91°F | 86°F |
| Normal low | 78°F | 73°F |
| Chance of a wet day | 33% | 28% |
| Sunrise / sunset | 6:56 am / 7:41 pm | 7:11 am / 7:06 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 (58 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°F0 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph20 of 30
- Hot dayshigh 90°F or more10 of 30
- Muggy daysdaily mean dew point 65°F or more27 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in7 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 6.7 in; a dry September brings about 4.0 in and a wet one about 8.1 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 91°F
- Coolest September2001: average high 85°F
- Wettest September2018: 24.3 in
- Driest September2017: 0.3 in
- Highest reading104°F (September 5, 2000)
- Lowest reading58°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 | 92°F | 89°F | 82°F |
| Normal low | 80°F | 76°F | 69°F |
| Wet days | 9 | 10 | 8 |
| Comfortable days | 0 | 0 | 6 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -3°F from August and -7°F into October.
Nearby alternatives in September
- Drier: Conroe, TX80 mi · high 90°F · 7 wet days
How Galveston ranks in September
- Normal high81st warmest of 378 cities; 24th of 38 in Texas
- Wet days296th driest of 378
- Comfortable days306th most of 342
What to pack for Galveston in September
- Light, breathable clothing – highs near 89°F and about 27 muggy days
- A rain jacket or umbrella – rain on about 10 days
- A swimsuit – about 20 beach days
Heating and cooling
September has 0 heating degree days and 522 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is Galveston in September?
The normal high is 89°F and the normal low is 76°F. From 1991 to 2020 the hottest September reading was 104°F (September 5, 2000).
Does it rain a lot in Galveston in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 6.7 in. The wettest September in 1991-2020 was in 2018 (24.3 in); the driest was in 2017 (0.3 in).
Is September a good time to visit Galveston?
September ranks 10th of 12 months on our comfort score for Galveston (41 out of 100). It has almost no comfortable days and about 10 days at 90°F or hotter. The best months are March, April and November.
Where the numbers come from
- Temperature and rain: Galveston Scholes Fld (USW00012923), 4.2 mi WSW of the city center, 5 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Houston Nwso (USC00414333), 21 mi NW of the city center, 19 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Galveston (USW00012944), 0.2 mi SW of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Houston Intercont Airport (USW00012960), 58 mi NW of the city center, 95 ft (89 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Scholes Intl At Glston Apt (722420-12923), 4.5 mi WSW of the city center, 5 ft . Hourly observations, 1991-2020.