Galveston weather in September: Galveston, Texas: normal highs, lows, rain and records for September
Galveston in September has a normal high of 89°F and a normal low of 76°F, a daily mean of 82°F, falling from 91°F on the 1st to 86°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 6.65 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 24°C, 169 mm of precipitation in September.
- NOAA stationGalveston Scholes Field
- Station IDUSW00012923
- Location29.27°N 94.86°W
- Elevation5 ft (2 m)
- Population53,538
- Jan 63° 49°
- Feb 66° 52°
- Mar 72° 58°
- Apr 78° 65°
- May 84° 72°
- Jun 90° 78°
- Jul 91° 80°
- Aug 92° 80°
- Sep 89° 76°
- Oct 82° 69°
- Nov 72° 59°
- Dec 66° 52°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Galveston in September?
The normal high is 89°F and the normal low 76°F, for a daily mean of 82.4°F. September is 3.5°F cooler than August and 7.1°F warmer than October. September is the 4th warmest month of the year in Galveston and the wettest. Across the month the normal high falls 5°F, from 91°F on September 1 to 86°F on September 30. From one year to the next September's mean temperature typically moves about 1.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 81°F and 84°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 91°F | 78°F | 33% | 23% |
| September 8 | 90°F | 77°F | 33% | 24% |
| September 15 | 89°F | 76°F | 31% | 23% |
| September 22 | 88°F | 75°F | 29% | 21% |
| September 30 | 86°F | 73°F | 27% | 18% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 91°F | 78°F | 33% | 23% | 12 h 50 min |
| September 2 | 91°F | 78°F | 33% | 23% | 12 h 40 min |
| September 3 | 91°F | 78°F | 33% | 23% | 12 h 40 min |
| September 4 | 90°F | 78°F | 33% | 23% | 12 h 40 min |
| September 5 | 90°F | 78°F | 33% | 23% | 12 h 40 min |
| September 6 | 90°F | 78°F | 33% | 24% | 12 h 40 min |
| September 7 | 90°F | 78°F | 33% | 24% | 12 h 40 min |
| September 8 | 90°F | 77°F | 33% | 24% | 12 h 30 min |
| September 9 | 90°F | 77°F | 33% | 24% | 12 h 30 min |
| September 10 | 90°F | 77°F | 32% | 24% | 12 h 30 min |
| September 11 | 89°F | 77°F | 32% | 23% | 12 h 30 min |
| September 12 | 89°F | 77°F | 32% | 23% | 12 h 30 min |
| September 13 | 89°F | 77°F | 32% | 23% | 12 h 30 min |
| September 14 | 89°F | 77°F | 31% | 23% | 12 h 20 min |
| September 15 | 89°F | 76°F | 31% | 23% | 12 h 20 min |
| September 16 | 89°F | 76°F | 31% | 22% | 12 h 20 min |
| September 17 | 89°F | 76°F | 31% | 22% | 12 h 20 min |
| September 18 | 88°F | 76°F | 30% | 22% | 12 h 20 min |
| September 19 | 88°F | 76°F | 30% | 22% | 12 h 20 min |
| September 20 | 88°F | 75°F | 30% | 21% | 12 h 10 min |
| September 21 | 88°F | 75°F | 30% | 21% | 12 h 10 min |
| September 22 | 88°F | 75°F | 29% | 21% | 12 h 10 min |
| September 23 | 88°F | 75°F | 29% | 20% | 12 h 10 min |
| September 24 | 87°F | 75°F | 28% | 20% | 12 h 10 min |
| September 25 | 87°F | 74°F | 28% | 20% | 12 h 10 min |
| September 26 | 87°F | 74°F | 28% | 19% | 12 h |
| September 27 | 87°F | 74°F | 28% | 19% | 12 h |
| September 28 | 87°F | 74°F | 27% | 19% | 12 h |
| September 29 | 87°F | 74°F | 27% | 18% | 12 h |
| September 30 | 86°F | 73°F | 27% | 18% | 12 h |
- Normal high
- 89°FSeptember average
- Normal low
- 76°FSeptember average
- Precipitation
- 6.65 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 11
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 29
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012923; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Galveston in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 4 (33%). In all, 6.65 in falls on 10 days of a normal September, 2 of them with an inch or more.
In a normal September in Galveston, 11 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012923.
What are the records for September in Galveston?
The warmest September temperature on Galveston's official record (since 1874) is 104°F, on September 5, 2000; the coldest is 52°F, on September 27, 1942. The wettest September brought 26.01 in (1885).
The September mean against the 1991-2020 normal of 82.4°F: 2021 83.0°F (+0.6), 2022 83.5°F (+1.1), 2023 85.7°F (+3.3), 2024 82.2°F (−0.2), 2026 85.1°F (+2.7). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 83.0°F | +0.6°F | 6.40 in |
| 2022 | 83.5°F | +1.1°F | 2.80 in |
| 2023 | 85.7°F | +3.3°F | 2.01 in |
| 2024 | 82.2°F | −0.2°F | 8.79 in |
| 2026 | 85.1°F | +2.7°F | 3.71 in |
Source: records: ACIS, NWS threaded record GLSthr; recent months: ACIS, station USW00012923. Records and recent months use complete months only.
How does September in Galveston compare across Texas?
Across the 321 places PlainClimate covers in Texas, September normal highs run from 81°F in Hart to 95°F in Presidio; Galveston's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.