July is one of the warmer months of the year in Katy, with average highs near 34°C and lows around 23.7°C (mean 28.9°C). It is about average for rainfall, averaging 98 mm of rainfall and 74% relative humidity across the period.
July is one of the warmer months of the year in Katy. Across 45 years of records, the warmest July in Katy was 2023 — when the month averaged 32.6°C — while the coldest was 2007 at 26.2°C. Typical July days reach 34°C with nights near 23.7°C. The long-term trend is warming, about 0.4°C per decade.
July is about average for rainfall in Katy, averaging 98 mm of rainfall. The wettest July on record was 2024 with 280 mm, while the driest was 1993 at 19 mm.
Relative humidity in Katy during July averages 74%. The most humid July was 2007 at 88%, and the least humid was 2000 at 58%.
July receives about 6.2 kWh/m²/day of solar energy in Katy. The sunniest July was 2015 at 7 kWh/m²/day, and the cloudiest was 2007 at 4.7.
Average wind speed in Katy during July is 1.5 m/s. The windiest July was 2022 at 2 m/s, while the calmest were 1991, 1997 and 2021 at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.2°C | 28.5°C | 28.8°C | 29.2°C | 30.1°C | +1.9°C |
| Avg High | 33.4°C | 33.5°C | 33.8°C | 34.5°C | 35.6°C | +2.2°C |
| Avg Low | 23.1°C | 23.5°C | 23.8°C | 23.9°C | 24.6°C | +1.5°C |
| Avg Rain | 98 mm | 72 mm | 116 mm | 100 mm | 110 mm | +12 mm |
July temperatures in Katy have risen by about 1.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 17.7°C (1990) to a record high of 42.9°C (2023).
Rainfall in July is about average for rainfall, averaging 98 mm, with a wettest year of 280 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Katy
July is a good time to visit Katy, with days averaging 34°C and nights around 23.7°C (mean 28.9°C, warmer than Katy's yearly average) and higher rainfall. October and April are marginally more temperate, but July still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 35.0°C | 29.5°C | 24.0°C | 38.9°C | 21.5°C | 89 mm | 73% | 1.4 m/s | 6 |
| 2024 🌧️ | 33.0°C | 28.6°C | 24.2°C | 39.4°C | 22.4°C | 280 mm | 80% | 1.3 m/s | 5.2 |
| 2023 🔥 | 39.6°C | 32.6°C | 25.7°C | 42.9°C | 22.9°C | 34 mm | 60% | 1.7 m/s | 6.6 |
| 2022 | 39.3°C | 32.5°C | 25.8°C | 42.2°C | 24.0°C | 30 mm | 59% | 2 m/s | 6.8 |
| 2021 | 31.8°C | 27.6°C | 23.4°C | 35.0°C | 21.7°C | 139 mm | 82% | 1.2 m/s | 5.7 |
| 2020 | 34.6°C | 29.5°C | 24.4°C | 39.2°C | 22.4°C | 87 mm | 75% | 1.7 m/s | 6.1 |
| 2019 | 35.1°C | 29.5°C | 23.8°C | 37.9°C | 19.0°C | 40 mm | 71% | 1.7 m/s | 6.5 |
| 2018 | 36.0°C | 29.7°C | 23.4°C | 40.5°C | 21.4°C | 102 mm | 68% | 1.4 m/s | 6.5 |
| 2017 | 34.6°C | 29.3°C | 24.0°C | 38.7°C | 20.7°C | 95 mm | 74% | 1.4 m/s | 6.2 |
| 2016 | 33.7°C | 29.0°C | 24.4°C | 37.5°C | 23.3°C | 74 mm | 78% | 1.6 m/s | 6.6 |
| 2015 | 33.6°C | 28.4°C | 23.3°C | 37.5°C | 20.5°C | 22 mm | 79% | 1.5 m/s | 7 |
| 2014 | 34.5°C | 28.9°C | 23.3°C | 38.3°C | 21.6°C | 105 mm | 73% | 1.3 m/s | 5.8 |
| 2013 | 35.6°C | 29.7°C | 23.9°C | 39.1°C | 20.7°C | 83 mm | 64% | 1.7 m/s | 6.2 |
| 2012 | 31.8°C | 27.6°C | 23.4°C | 36.4°C | 22.5°C | 200 mm | 80% | 1.3 m/s | 5.7 |
| 2011 | 37.4°C | 31.3°C | 25.2°C | 40.1°C | 23.3°C | 61 mm | 60% | 1.7 m/s | 6.4 |
| 2010 | 32.5°C | 28.3°C | 24.2°C | 35.9°C | 22.4°C | 218 mm | 81% | 1.5 m/s | 5.7 |
| 2009 | 37.5°C | 31.3°C | 25.1°C | 40.8°C | 23.7°C | 83 mm | 63% | 1.9 m/s | 6.4 |
| 2008 | 35.6°C | 29.5°C | 23.3°C | 38.1°C | 20.8°C | 74 mm | 67% | 1.7 m/s | 6.5 |
| 2007 ❄️ | 29.4°C | 26.2°C | 23.1°C | 32.9°C | 19.8°C | 227 mm | 88% | 1.3 m/s | 4.7 |
| 2006 | 31.7°C | 27.6°C | 23.5°C | 35.6°C | 21.7°C | 208 mm | 82% | 1.3 m/s | 5.4 |
| 2005 | 35.3°C | 29.9°C | 24.5°C | 40.9°C | 20.2°C | 141 mm | 70% | 1.4 m/s | 6.2 |
| 2004 | 32.1°C | 27.6°C | 23.0°C | 35.0°C | 21.4°C | 78 mm | 81% | 1.3 m/s | 6.5 |
| 2003 | 32.6°C | 28.2°C | 23.8°C | 36.2°C | 22.4°C | 120 mm | 79% | 1.5 m/s | 5.5 |
| 2002 | 32.4°C | 28.1°C | 23.7°C | 36.6°C | 22.5°C | 127 mm | 80% | 1.5 m/s | 6.2 |
| 2001 | 33.4°C | 28.5°C | 23.6°C | 37.4°C | 21.9°C | 61 mm | 78% | 1.4 m/s | 6.3 |
| 2000 | 37.9°C | 31.0°C | 24.2°C | 42.1°C | 21.3°C | 41 mm | 58% | 1.8 m/s | 6.9 |
| 1999 | 32.9°C | 28.2°C | 23.5°C | 37.2°C | 21.5°C | 106 mm | 77% | 1.4 m/s | 6.2 |
| 1998 | 37.3°C | 31.1°C | 24.9°C | 41.3°C | 23.1°C | 41 mm | 65% | 1.8 m/s | 6.8 |
| 1997 | 33.9°C | 28.7°C | 23.5°C | 35.8°C | 21.1°C | 56 mm | 76% | 1.2 m/s | 6.6 |
| 1996 | 35.1°C | 29.6°C | 24.1°C | 37.8°C | 22.5°C | 52 mm | 69% | 1.6 m/s | 6.7 |
| 1995 | 33.9°C | 28.8°C | 23.6°C | 39.6°C | 21.0°C | 125 mm | 75% | 1.7 m/s | 6.6 |
| 1994 | 34.5°C | 28.9°C | 23.3°C | 39.0°C | 19.1°C | 40 mm | 70% | 1.8 m/s | 6.6 |
| 1993 | 32.4°C | 27.8°C | 23.2°C | 35.3°C | 21.7°C | 19 mm | 81% | 1.6 m/s | 6.9 |
| 1992 | 31.0°C | 27.2°C | 23.3°C | 33.2°C | 21.6°C | 90 mm | 84% | 1.6 m/s | 6.1 |
| 1991 | 30.9°C | 26.9°C | 22.9°C | 35.1°C | 21.0°C | 96 mm | 84% | 1.2 m/s | 6.4 |
| 1990 | 33.5°C | 28.1°C | 22.7°C | 38.2°C | 17.7°C | 96 mm | 71% | 1.5 m/s | 5.8 |
| 1989 | 31.5°C | 27.1°C | 22.7°C | 34.8°C | 20.0°C | 112 mm | 80% | 1.5 m/s | 6.2 |
| 1988 | 34.7°C | 29.2°C | 23.7°C | 38.1°C | 19.5°C | 95 mm | 69% | 1.8 m/s | 5.9 |
| 1987 | 31.4°C | 27.1°C | 22.8°C | 34.0°C | 20.1°C | 118 mm | 83% | 1.5 m/s | 6.2 |
| 1986 | 34.8°C | 29.0°C | 23.3°C | 41.2°C | 21.2°C | 26 mm | 70% | 1.6 m/s | 6.8 |
| 1985 | 33.6°C | 28.0°C | 22.4°C | 38.2°C | 18.9°C | 83 mm | 73% | 1.6 m/s | 6.4 |
| 1984 | 34.9°C | 29.0°C | 23.1°C | 39.0°C | 20.7°C | 80 mm | 66% | 1.5 m/s | 6.6 |
| 1983 | 32.0°C | 27.6°C | 23.1°C | 34.4°C | 21.3°C | 169 mm | 80% | 1.6 m/s | — |
| 1982 | 35.4°C | 29.5°C | 23.6°C | 38.0°C | 22.1°C | 56 mm | 69% | 1.7 m/s | — |
| 1981 | 31.9°C | 27.6°C | 23.4°C | 35.3°C | 22.0°C | 140 mm | 83% | 1.4 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 34°C with lows near 23.7°C (mean 28.9°C), based on 45 years of NASA POWER data.
July averages 98 mm of rainfall in Katy, about average for rainfall. The wettest on record was 280 mm in 2024.
The hottest July reached 42.9°C in 2023. The coldest dipped to 17.7°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.9°C. Daytime highs moved from 33.6°C to 35.7°C and overnight lows from 23.1°C to 24.6°C over the same span.
July is one of the warmer months of the year in Katy and about average for rainfall, so plan for around 34°C daytime highs and 23.7°C at night.
Not quite — July is the 11th coolest month in Katy, averaging 28.9°C.
For July in Katy, pack light, breathable clothing and sun protection, with typical highs of 34°C and lows of 23.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 74% — moderately humid.
Average wind speed in July is 1.5 m/s. The windiest July on record averaged 2 m/s (2022).
The wettest July on record was 2024 with 280 mm. On average, July sees 98 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Katy behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
