Climate averages 1991–2020
Pasadena (Texas), United States weather
in September.
A hot, wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Pasadena (Texas), United States: daytime highs average 30.6°C and nights cool to about 22.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 118 mm of rain on roughly 12 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 22 min on an average September day.
The nearest other city in this atlas is Pearland (16 km away). In September its highs average 30.6°C, about as warm as Pasadena (Texas), United States, with 124 mm of rain.
Among the 498 cities listed in the United States, Pasadena (Texas), United States ranks joint 87th of 498 for the warmest September highs and joint 442nd of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Pasadena (Texas), United States is 3.7°C warmer than that mean.
From September to October, average highs fall by 3.9°C to 26.7°C, and monthly rainfall falls from 118 mm to 105 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Pasadena (Texas), United States climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 16.8°C7.9°C | 7.9°C | 106 | 10.0 | 10.510 h |
| February | 18.7°C9.7°C | 9.7°C | 84 | 9.1 | 11.111 h |
| March | 21.8°C12.9°C | 12.9°C | 94 | 9.2 | 12.012 h |
| April | 25.2°C16.3°C | 16.3°C | 96 | 8.9 | 12.913 h |
| May | 28.9°C20.6°C | 20.6°C | 90 | 9.8 | 13.614 h |
| June | 31.5°C23.7°C | 23.7°C | 113 | 12.7 | 14.014 h |
| July | 32.6°C24.6°C | 24.6°C | 91 | 12.7 | 13.914 h |
| August | 33.0°C24.6°C | 24.6°C | 98 | 13.2 | 13.213 h |
| September, selected | 30.6°C22.3°C | 22.3°C | 118 | 11.8 | 12.412 h |
| October | 26.7°C17.7°C | 17.7°C | 105 | 8.7 | 11.511 h |
| November | 21.4°C12.5°C | 12.5°C | 103 | 8.3 | 10.711 h |
| December | 17.7°C9.0°C | 9.0°C | 105 | 9.6 | 10.310 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Pearland in SeptemberUnited States · 16 kmHigh 30.6°C · Low 22.3°C · 124 mm rain
- Houston in SeptemberUnited States · 17 kmHigh 30.8°C · Low 22.1°C · 118 mm rain
- Baytown in SeptemberUnited States · 23 kmHigh 30.3°C · Low 22.2°C · 129 mm rain
- League City in SeptemberUnited States · 23 kmHigh 30.0°C · Low 23.0°C · 130 mm rain
- Missouri City in SeptemberUnited States · 33 kmHigh 30.7°C · Low 22.3°C · 116 mm rain
- Sugar Land in SeptemberUnited States · 42 kmHigh 30.8°C · Low 22.3°C · 108 mm rain
- Cypress in SeptemberUnited States · 56 kmHigh 31.1°C · Low 22.0°C · 97 mm rain
- The Woodlands in SeptemberUnited States · 59 kmHigh 31.1°C · Low 21.8°C · 100 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Pasadena) is explained once on the Pasadena (Texas), United States year overview and on the Sources, method and limits page.
Houston lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.