Monthly outlook for Katy, TX: average high 101.5°, average low 76.2°. That is 5° above the climate normal for August. Precipitation is expected on 1 day (about 0.3 inches), against a normal of 6 days and 1.6 inches. The warmest day looks like 22 August (105.3°), the coolest 17 August (73.4°).
101.5°/76.2°
Average high / low
+5°
Above normal
1 / 6
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
100.2°
92.8°
+4.1°
18 August – 27 August
103.8°
91.9°
+6.6°
28 August – 6 September
at normal
90°
—
August records over 66 years
106.9°27 August 2023All-time high
62.1°10 August 1989All-time low
Climate normals and records are computed from the nearest reference point — Mission Bend (12 mi).
Sun, 0995° / 76°0.03
95 °
Katy, Sunday, 9 August
Light rain. High 95°, low 76°.
Pressure30.03 inHg
Wind5.8 mph SE
Humidity48%
Visibility6.2 mi
Dew point70°
Mon, 1099° / 77°0
99 °
Katy, Monday, 10 August
Mostly clear. High 99°, low 77°.
Pressure30.06 inHg
Wind8.4 mph S
Humidity48%
Visibility6.2 mi
Dew point70°
Tue, 11102° / 77°0
102 °
Katy, Tuesday, 11 August
Clear. High 102°, low 77°.
Pressure30.03 inHg
Wind8.7 mph S
Humidity46%
Visibility6.2 mi
Dew point70°
Wed, 12101° / 77°0
101 °
Katy, Wednesday, 12 August
Clear. High 101°, low 77°.
Pressure29.97 inHg
Wind10 mph S
Humidity45%
Visibility6.2 mi
Dew point71°
Thu, 13102° / 77°0
102 °
Katy, Thursday, 13 August
Partly cloudy. High 102°, low 77°.
Pressure29.91 inHg
Wind16 mph S
Humidity36%
Visibility—
Dew point64°
Fri, 14103° / 77°0
103 °
Katy, Friday, 14 August
Clear. High 103°, low 77°.
Pressure30.00 inHg
Wind14.7 mph S
Humidity34%
Visibility—
Dew point63°
Sat, 15103° / 77°0
103 °
Katy, Saturday, 15 August
Partly cloudy. High 103°, low 77°.
Pressure30.12 inHg
Wind16.5 mph SE
Humidity34%
Visibility—
Dew point62°
Sun, 16102° / 76°0
102 °
Katy, Sunday, 16 August
Clear. High 102°, low 76°.
Pressure30.12 inHg
Wind15.3 mph SE
Humidity37%
Visibility—
Dew point64°
Mon, 17102° / 73°0
102 °
Katy, Monday, 17 August
Partly cloudy. High 102°, low 73°.
Pressure30.06 inHg
Wind16.7 mph SE
Humidity30%
Visibility—
Dew point58°
Tue, 18101° / 77°0
101 °
Katy, Tuesday, 18 August
Overcast. High 101°, low 77°.
Pressure30.03 inHg
Wind14.1 mph SE
Humidity40%
Visibility—
Dew point64°
Wed, 19104° / 76°0
104 °
Katy, Wednesday, 19 August
Mostly clear. High 104°, low 76°.
Pressure29.97 inHg
Wind17 mph S
Humidity35%
Visibility—
Dew point63°
Thu, 20104° / 75°0
104 °
Katy, Thursday, 20 August
Mostly clear. High 104°, low 75°.
Pressure29.94 inHg
Wind17.4 mph S
Humidity35%
Visibility—
Dew point63°
Fri, 21104° / 76°0
104 °
Katy, Friday, 21 August
Clear. High 104°, low 76°.
Pressure29.91 inHg
Wind15.3 mph S
Humidity31%
Visibility—
Dew point60°
Sat, 22105° / 75°0
105 °
Katy, Saturday, 22 August
Clear. High 105°, low 75°.
Pressure29.91 inHg
Wind13.2 mph S
Humidity31%
Visibility—
Dew point61°
Sun, 23104° / 76°0.23
104 °
Katy, Sunday, 23 August
Rain. High 104°, low 76°.
Pressure29.88 inHg
Wind19 mph E
Humidity30%
Visibility—
Dew point61°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2492° / 76°0.09
92 °
Katy, Monday, 24 August
Climate normal for this date — 60-year average.
Average high92°
Average low76°
Average precipitation0.09 in
Chance of precipitation47%
Record high104° (2023)
Record low65° (1961)
Tue, 2591° / 76°0.09
91 °
Katy, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high91°
Average low76°
Average precipitation0.09 in
Chance of precipitation40%
Record high101° (2023)
Record low66° (1961)
Wed, 2691° / 75°0.14
91 °
Katy, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high91°
Average low75°
Average precipitation0.14 in
Chance of precipitation38%
Record high103° (2023)
Record low67° (1961)
Thu, 2791° / 76°0.19
91 °
Katy, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high91°
Average low76°
Average precipitation0.19 in
Chance of precipitation45%
Record high107° (2023)
Record low68° (1970)
Fri, 2890° / 75°0.19
90 °
Katy, Friday, 28 August
Climate normal for this date — 60-year average.
Average high90°
Average low75°
Average precipitation0.19 in
Chance of precipitation52%
Record high104° (2011)
Record low69° (1968)
Sat, 2990° / 75°0.2
90 °
Katy, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high90°
Average low75°
Average precipitation0.2 in
Chance of precipitation45%
Record high102° (2011)
Record low65° (1992)
Sun, 3091° / 75°0.12
91 °
Katy, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high91°
Average low75°
Average precipitation0.12 in
Chance of precipitation48%
Record high102° (2000)
Record low67° (1992)
Mon, 3190° / 75°0.16
90 °
Katy, Monday, 31 August
Climate normal for this date — 60-year average.
Average high90°
Average low75°
Average precipitation0.16 in
Chance of precipitation53%
Record high104° (2000)
Record low69° (1972)
Tue, 0190° / 75°0.12
90 °
Katy, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high90°
Average low75°
Average precipitation0.12 in
Chance of precipitation48%
Record high103° (2000)
Record low68° (2004)
Wed, 0290° / 75°0.13
90 °
Katy, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high90°
Average low75°
Average precipitation0.13 in
Chance of precipitation45%
Record high101° (2000)
Record low70° (2017)
Thu, 0390° / 75°0.17
90 °
Katy, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high90°
Average low75°
Average precipitation0.17 in
Chance of precipitation57%
Record high102° (2000)
Record low64° (1987)
Fri, 0490° / 75°0.17
90 °
Katy, Friday, 4 September
Climate normal for this date — 60-year average.
Average high90°
Average low75°
Average precipitation0.17 in
Chance of precipitation52%
Record high107° (2000)
Record low66° (1974)
Sat, 0589° / 74°0.13
89 °
Katy, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high89°
Average low74°
Average precipitation0.13 in
Chance of precipitation42%
Record high106° (2000)
Record low59° (1974)
Sun, 0689° / 73°0.1
89 °
Katy, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high89°
Average low73°
Average precipitation0.1 in
Chance of precipitation52%
Record high101° (2023)
Record low60° (1974)
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Katy, TX are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Katy, TX since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.