Climate averages 1991–2020
Cypress weather
in September.
A hot, wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Cypress: daytime highs average 31.1°C and nights cool to about 22.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 97 mm of rain on roughly 10 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 22 min on an average September day.
The nearest other city in this atlas is The Woodlands (29 km away). In September its highs average 31.1°C, about as warm as Cypress, with 100 mm of rain.
Among the 498 cities listed in the United States, Cypress ranks joint 53rd of 498 for the warmest September highs and joint 379th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Cypress is 4.2°C warmer than that mean.
From September to October, average highs fall by 4.3°C to 26.8°C, and monthly rainfall rises from 97 mm to 99 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
Cypress climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 16.4°C7.2°C | 7.2°C | 95 | 9.7 | 10.410 h |
| February | 18.4°C9.1°C | 9.1°C | 79 | 8.8 | 11.111 h |
| March | 21.8°C12.2°C | 12.2°C | 85 | 9.3 | 12.012 h |
| April | 25.5°C15.7°C | 15.7°C | 96 | 8.6 | 12.913 h |
| May | 29.4°C20.1°C | 20.1°C | 99 | 9.9 | 13.614 h |
| June | 32.1°C23.3°C | 23.3°C | 110 | 11.9 | 14.014 h |
| July | 33.3°C24.3°C | 24.3°C | 74 | 10.5 | 13.914 h |
| August | 33.9°C24.5°C | 24.5°C | 83 | 11.1 | 13.213 h |
| September, selected | 31.1°C22.0°C | 22.0°C | 97 | 10.3 | 12.412 h |
| October | 26.8°C17.2°C | 17.2°C | 99 | 8.7 | 11.511 h |
| November | 21.1°C11.9°C | 11.9°C | 96 | 8.5 | 10.711 h |
| December | 17.2°C8.3°C | 8.3°C | 102 | 9.8 | 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
- The Woodlands in SeptemberUnited States · 29 kmHigh 31.1°C · Low 21.8°C · 100 mm rain
- Sugar Land in SeptemberUnited States · 39 kmHigh 30.8°C · Low 22.3°C · 108 mm rain
- Houston in SeptemberUnited States · 40 kmHigh 30.8°C · Low 22.1°C · 118 mm rain
- Missouri City in SeptemberUnited States · 42 kmHigh 30.7°C · Low 22.3°C · 116 mm rain
- Pasadena (Texas), United States in SeptemberUnited States · 56 kmHigh 30.6°C · Low 22.3°C · 118 mm rain
- Pearland in SeptemberUnited States · 60 kmHigh 30.6°C · Low 22.3°C · 124 mm rain
- Baytown in SeptemberUnited States · 74 kmHigh 30.3°C · Low 22.2°C · 129 mm rain
- League City in SeptemberUnited States · 78 kmHigh 30.0°C · Low 23.0°C · 130 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 Cypress) is explained once on the Cypress year overview and on the Sources, method and limits page.