Plano (TX) Temperature by Month

The average annual maximum temperature in Plano, Texas, United States of America is 25°C (77°F), with daytime highs ranging from 13°C (55°F) in January to 36°C (97°F) in August. This page covers monthly averages, day-night differences, and how Plano compares to cities worldwide.

The climate in Plano is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging 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 Plano by month:

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. August, the warmest month of the year, receives 305 hours of sunshine.

The chart below shows the average temperature throughout the year:

Plano'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.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

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 Plano, January is the coolest month, with average highs of 13°C (55°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.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

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