As of 05:38 CDT

Weather in Lewisville, TX

80°

Lewisville, Sunday, 9 August, 05:38

Mostly clear. Feels like 80°. High 102°, low 79°.

Pressure29.97 inHg

Wind5 mph S

Humidity77%

Visibility6.2 mi

Dew point72°

See detailed hourly forecast

Monthly outlook for Lewisville, TX: average high 106°, average low 85.2°. That is 6.8° above the climate normal for August. Precipitation is expected on 0 days (about 0.1 inches), against a normal of 3 days and 1.1 inches. The warmest day looks like 21 August (110.3°), the coolest 9 August (79°).

106°/85.2°

Average high / low

+6.8°

Above normal

0 / 3

Wet days / normal

0.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	104.9°	93.8°	+6.2°
19 August – 28 August	107.7°	93.3°	+8°
29 August – 7 September	at normal	90.4°	—

August records over 66 years

108.3°3 August 2011All-time high

60.6°25 August 1966All-time low

Mon, 10101° / 79°

101 °

Lewisville, Monday, 10 August

Clear. High 101°, low 79°.

Pressure30.00 inHg

Wind10.6 mph S

Humidity36%

Visibility6.2 mi

Dew point64°

Tue, 11104° / 83°

104 °

Lewisville, Tuesday, 11 August

Clear. High 104°, low 83°.

Pressure29.97 inHg

Wind12.8 mph S

Humidity36%

Visibility6.2 mi

Dew point65°

Wed, 12105° / 84°

105 °

Lewisville, Wednesday, 12 August

Partly cloudy. High 105°, low 84°.

Pressure29.88 inHg

Wind13.2 mph S

Humidity34%

Visibility6.2 mi

Dew point64°

Thu, 13105° / 83°

105 °

Lewisville, Thursday, 13 August

Partly cloudy. High 105°, low 83°.

Pressure29.88 inHg

Wind17.7 mph S

Humidity28%

Visibility—

Dew point58°

Fri, 14105° / 82°

105 °

Lewisville, Friday, 14 August

Clear. High 105°, low 82°.

Pressure29.97 inHg

Wind18.4 mph S

Humidity31%

Visibility—

Dew point61°

Sat, 15105° / 85°

105 °

Lewisville, Saturday, 15 August

Clear. High 105°, low 85°.

Pressure30.06 inHg

Wind17.9 mph S

Humidity31%

Visibility—

Dew point62°

Sun, 16106° / 87°

106 °

Lewisville, Sunday, 16 August

Mostly clear. High 106°, low 87°.

Pressure30.06 inHg

Wind14.6 mph S

Humidity29%

Visibility—

Dew point62°

Mon, 17107° / 86°

107 °

Lewisville, Monday, 17 August

Clear. High 107°, low 86°.

Pressure30.00 inHg

Wind11 mph SW

Humidity17%

Visibility—

Dew point49°

Tue, 18108° / 87°

108 °

Lewisville, Tuesday, 18 August

Clear. High 108°, low 87°.

Pressure29.91 inHg

Wind13.3 mph S

Humidity18%

Visibility—

Dew point50°

Wed, 19109° / 87°

109 °

Lewisville, Wednesday, 19 August

Clear. High 109°, low 87°.

Pressure29.94 inHg

Wind11.5 mph S

Humidity22%

Visibility—

Dew point57°

Thu, 20110° / 89°

110 °

Lewisville, Thursday, 20 August

Partly cloudy. High 110°, low 89°.

Pressure29.91 inHg

Wind11.2 mph SW

Humidity21%

Visibility—

Dew point56°

Fri, 21110° / 89°

0.02

110 °

Lewisville, Friday, 21 August

Light rain. High 110°, low 89°.

Pressure29.91 inHg

Wind23.7 mph E

Humidity20%

Visibility—

Dew point55°

Sat, 22108° / 88°

0.03

108 °

Lewisville, Saturday, 22 August

Light rain. High 108°, low 88°.

Pressure29.88 inHg

Wind14.3 mph SE

Humidity26%

Visibility—

Dew point60°

Sun, 23104° / 86°

0.03

104 °

Lewisville, Sunday, 23 August

Light rain. High 104°, low 86°.

Pressure29.91 inHg

Wind13.6 mph SE

Humidity31%

Visibility—

Dew point62°

Mon, 24105° / 87°

105 °

Lewisville, Monday, 24 August

Light rain. High 105°, low 87°.

Pressure29.91 inHg

Wind12.1 mph SE

Humidity27%

Visibility—

Dew point60°

From day 17 onward the outlook is built from 60-year climate statistics

Tue, 2593° / 77°

0.02

93 °

Lewisville, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high93°

Average low77°

Average precipitation0.02 in

Chance of precipitation12%

Record high105° (2023)

Record low61° (1966)

Wed, 2693° / 77°

0.04

93 °

Lewisville, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high93°

Average low77°

Average precipitation0.04 in

Chance of precipitation18%

Record high104° (2023)

Record low67° (1966)

Thu, 2793° / 77°

0.06

93 °

Lewisville, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high93°

Average low77°

Average precipitation0.06 in

Chance of precipitation25%

Record high105° (2011)

Record low66° (1966)

Fri, 2892° / 76°

0.09

92 °

Lewisville, Friday, 28 August

Climate normal for this date — 60-year average.

Average high92°

Average low76°

Average precipitation0.09 in

Chance of precipitation27%

Record high105° (2011)

Record low64° (1992)

Sat, 2992° / 76°

0.08

92 °

Lewisville, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high92°

Average low76°

Average precipitation0.08 in

Chance of precipitation23%

Record high103° (2020)

Record low65° (1986)

Sun, 3091° / 75°

0.08

91 °

Lewisville, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high91°

Average low75°

Average precipitation0.08 in

Chance of precipitation25%

Record high102° (2000)

Record low65° (1986)

Mon, 3191° / 76°

0.09

91 °

Lewisville, Monday, 31 August

Climate normal for this date — 60-year average.

Average high91°

Average low76°

Average precipitation0.09 in

Chance of precipitation23%

Record high103° (2011)

Record low67° (2004)

Tue, 0191° / 75°

0.17

91 °

Lewisville, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high91°

Average low75°

Average precipitation0.17 in

Chance of precipitation30%

Record high103° (2000)

Record low68° (1967)

Wed, 0290° / 75°

0.13

90 °

Lewisville, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high90°

Average low75°

Average precipitation0.13 in

Chance of precipitation30%

Record high105° (2000)

Record low64° (1987)

Thu, 0390° / 74°

0.11

90 °

Lewisville, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high90°

Average low74°

Average precipitation0.11 in

Chance of precipitation30%

Record high105° (2000)

Record low61° (1974)

Fri, 0490° / 75°

0.06

90 °

Lewisville, Friday, 4 September

Climate normal for this date — 60-year average.

Average high90°

Average low75°

Average precipitation0.06 in

Chance of precipitation23%

Record high108° (2000)

Record low59° (1974)

Sat, 0590° / 74°

0.15

90 °

Lewisville, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high90°

Average low74°

Average precipitation0.15 in

Chance of precipitation22%

Record high102° (2012)

Record low57° (1974)

Sun, 0690° / 73°

0.13

90 °

Lewisville, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high90°

Average low73°

Average precipitation0.13 in

Chance of precipitation18%

Record high100° (2012)

Record low56° (1974)

Mon, 0790° / 73°

0.05

90 °

Lewisville, Monday, 7 September

Climate normal for this date — 60-year average.

Average high90°

Average low73°

Average precipitation0.05 in

Chance of precipitation20%

Record high105° (2023)

Record low61° (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 Lewisville, 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 Lewisville, 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.