Lewisville (TX) Temperature by Month

Lewisville in Texas, United States of America sees significant seasonal temperature differences, with daytime highs between 14°C (57°F) in January and 36°C (97°F) in August, averaging 25°C (77°F) annually. Explore the full monthly breakdown below.

Visitors to Lewisville will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 25°C (77°F) in August to 1°C (34°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Lewisville by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 305 hours of sunshine.

The chart below shows the average temperature throughout the year:

Lewisville's average annual maximum temperature is 25°C (77°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Lewisville, January is the coolest month, with average highs of 14°C (57°F) and humidity around 68%, considered high. In August, the warmest month, temperatures average 36°C (97°F) with 60% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

For more on Lewisville's weather, including monthly rainfall, sunshine hours, and humidity, visit our Lewisville climate page.