Katy weather in August

In August, Katy sees average daytime highs of 93°F and overnight lows near 75°F, with 3.3 in of rain across 11.5 wet days and about 13.1 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 93°F through the month. The sky is clear or mostly clear about 40% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 24 min at the start of August to 12 h 42 min by month's end. Set against the rest of the year, August is Katy's 5th-clearest and 12th-windiest month. For the whole year in context, see Katy's year-round climate.

Daytime high
93°
1st warmest
Overnight low
75°
11th coldest
Rainfall
3.3 in
11.5 wet days
Daylight
13 h 06 min
5:55 AM – 7:00 PM
Cloud cover
53%
5th clearest
Wind
6 mph
12th windiest
Solar energy
5.87 kWh/m²
Travel score
2.9
out of 10

Katy is city in Harris, Waller, and Fort Bend counties in Texas, United States.

Density
552/km²
people per km²
Founded
1945

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 93°F through the month.

A typical August day in Katy reaches about 93°F in the afternoon and slips back to 75°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 88°F and 99°F. Set against its neighbours, August runs on par with July and about 5°F warmer than September.

70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
19476
29476
39476
49476
59476
69476
79476
89476
99476
109476
119476
129476
139476
149476
159476
169476
179476
189476
199376
209375
219375
229375
239375
249375
259275
269275
279275
289275
299274
309274
319274

How August really feels in Katy

Once humidity and wind are folded in, August averages 31 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
31
19 feel dangerously hot (≥ 102°F)
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Katy weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan63° / 45°3.79.510.35.7
Feb67° / 48°2.98.610.96.2
Mar73° / 54°3.2911.86.9
Apr79° / 60°3.68.412.76.9
May86° / 68°3.69.713.55.1
Jun91° / 74°4.212.313.93.6
Jul93° / 76°3.111.613.73.0
Aug93° / 75°3.311.513.12.9
Sep89° / 71°3.911.412.24.2
Oct81° / 62°3.9911.36.6
Nov72° / 53°3.78.410.57.0
Dec65° / 46°3.99.310.16.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 40%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16238
26238
36337
46238
56238
66337
76337
86337
96337
106238
116238
126337
136337
146238
156238
166139
176139
186040
195941
205941
215842
225842
235743
245644
255644
265545
275545
285545
295545
305545
315644

Chance of precipitation in August

Any precipitation

Katy gets around 3.3 in of rain over 11.5 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 44% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
233
333
433
533
633
733
833
933
1034
1134
1235
1336
1436
1537
1637
1738
1839
1939
2040
2140
2241
2341
2441
2542
2642
2742
2843
2943
3043
3144

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the oppressive band about 71% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1001107514
200197614
300197614
400197713
500197713
600187813
701187812
801187812
901187812
1001177813
1101177813
1201277713
1301277614
1401287415
1501287415
1601287316
1701287316
1801297216
1901297117
20013106917
21013106917
22013116817
23013126717
24014126617
25014136517
26014136517
27015146416
28015146416
29026156215
30126156115
31127166014

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 24 min at the start of August to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over August. Sunrise moves from 5:46 AM to 6:04 AM, and sunset from 7:13 PM to 6:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:467:13
213.45:467:12
313.45:477:11
413.45:487:11
513.45:487:10
613.35:497:09
713.35:507:08
813.35:507:07
913.35:517:06
1013.25:517:06
1113.25:527:05
1213.25:537:04
1313.25:537:03
1413.15:547:02
1513.15:547:01
1613.15:557:00
1713.15:566:59
1813.05:566:58
1913.05:576:57
2013.05:576:56
2112.95:586:55
2212.95:586:54
2312.95:596:52
2412.96:006:51
2512.86:006:50
2612.86:016:49
2712.86:016:48
2812.76:026:47
2912.76:026:46
3012.76:036:44
3112.76:046:43

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.87 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 6.28 kWh/m² in July across the year — August's 5.87 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.2Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.0Intense
136.0Bright
146.0Bright
155.9Bright
165.9Bright
175.8Bright
185.8Bright
195.8Bright
205.7Bright
215.7Bright
225.7Bright
235.6Bright
245.6Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in August

Is August a good time to visit Katy?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.9
Sightseeing
12th-best month of the year
5.7
Beach & pool
7th-best month of the year

August is a weaker month for outdoor sightseeing in Katy.

What to pack for Katy in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Katy sees daytime highs around 93°F and nights near 75°F. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Katy in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateAug 10UV 11Dec 21UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May10Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Katy in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August 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).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1520 µg/m³Dec 138 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr11Good
May15Moderate
Jun17Moderate
Jul21Moderate
Aug15Moderate
Sep12Moderate
Oct8Good
Nov8Good
Dec8Good
Location & terrain

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.

2 miles
72 ft
10 miles
171 ft
50 miles
492 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Cinco Ranch 5.0 mi · Mission Bend 11 mi · Pecan Grove 12 mi · Alief 15 mi · Cypress 15 mi · New Territory 16 mi · Rosenberg 16 mi · Sugar Land 16 mi

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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).