Katy in Summer
In summer (June, July and August), Katy sees average daytime highs around 92°F and overnight lows near 75°F, with 10.6 in of rain over about 35 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 92°F. The sky is clear or mostly clear about 40% of the time across summer, and the air most often feels oppressive.
Summer is Katy's weakest season of the year to visit on our travel score. For the whole year in context, see Katy's year-round climate.
- Avg daytime high
- 92°F
- warmest season of the year
- Avg overnight low
- 75°F
- Rainfall
- 10.6 in
- 35 wet days
- Avg wind
- 6 mph
- Travel score
- 3.2
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Katy in Summer
Across summer, daytime highs hold fairly steady around 92°F.
A typical summer day in Katy reaches about 92°F and drops to 75°F overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Katy
Once humidity and wind are folded in, summer brings about 92 days that feel above 90°F and 0 that feel at or below 32°F.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Katy weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 63° / 45° | 3.7 | 9.5 | 10.3 | 5.7 |
| Feb | 67° / 48° | 2.9 | 8.6 | 10.9 | 6.2 |
| Mar | 73° / 54° | 3.2 | 9 | 11.8 | 6.9 |
| Apr | 79° / 60° | 3.6 | 8.4 | 12.7 | 6.9 |
| May | 86° / 68° | 3.6 | 9.7 | 13.5 | 5.1 |
| Jun | 91° / 74° | 4.2 | 12.3 | 13.9 | 3.6 |
| Jul | 93° / 76° | 3.1 | 11.6 | 13.7 | 3.0 |
| Aug | 93° / 75° | 3.3 | 11.5 | 13.1 | 2.9 |
| Sep | 89° / 71° | 3.9 | 11.4 | 12.2 | 4.2 |
| Oct | 81° / 62° | 3.9 | 9 | 11.3 | 6.6 |
| Nov | 72° / 53° | 3.7 | 8.4 | 10.5 | 7.0 |
| Dec | 65° / 46° | 3.9 | 9.3 | 10.1 | 6.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 40% of the time across summer.
Chance of precipitation in Summer
Katy gets around 10.6 in of rain over 35 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 6 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 48 min in early June to 12 h 42 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.1 kWh/m².
Is summer a good time to visit Katy?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Katy.
What to pack for Katy in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Katy sees daytime highs around 92°F and nights near 75°F. Pack light clothes and sun protection. Worth having: rain gear. About 35 days see rain.
UV index in Katy in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Katy peaks around August 10 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 6 | 6 | 10 | 10 | 10 | 11 | 11 | 8 | 6 | 5 | 4 |
| Level | Moderate | High | High | Very high | Extreme | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 6 | High |
| Mar | 6 | High |
| Apr | 10 | Very high |
| May | 10 | Extreme |
| Jun | 10 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 4 | Moderate |
Air quality in Katy in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Katy is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 9 | 11 | 11 | 15 | 17 | 21 | 15 | 12 | 8 | 8 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 9 | Good |
| Mar | 11 | Good |
| Apr | 11 | Good |
| May | 15 | Moderate |
| Jun | 17 | Moderate |
| Jul | 21 | Moderate |
| Aug | 15 | Moderate |
| Sep | 12 | Moderate |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Katy?
Katy sits at 29.8°N, 95.8°W, 138 ft above sea level, in United States. The nearest listed city is Cinco Ranch, 5.0 mi away.
Topography around Katy
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Katy.
Within 2 miles, the terrain around Katy has only modest variations in elevation — a maximum elevation change of 72 ft around an average of 144 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 171 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 492 ft.
The land around Katy is covered by artificial surfaces (35%), trees (31%) and grassland (24%) within 2 miles, grassland (39%) and trees (30%) within 10 miles, and trees (41%) and grassland (37%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Katy (29.7858°, -95.8244°, elevation 138 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.