Portland (TX) Weather & Climate: Best Time to Visit

In Portland, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a very warm 34°C (93°F) in August to a pleasant 19°C (66°F) in January.

Nighttime temperatures range from 26°C (79°F) in August to 8°C (46°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

On average, Portland receives a reasonable amount of rainfall, with an annual precipitation of 770 mm (30 in). The seasons in Portland bring significant changes in precipitation. The wettest month, September, receives high rainfall, with an average of 143 mm (5.6 in) of precipitation. This rainfall is distributed across 13 rainy days.

In contrast, the driest month, February, experiences much less rainfall, totaling 29 mm (1.1 in) over 7 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Portland Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

In Portland, summer days are longer and more sunny, with daily sunshine hours peaking at 11.0 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.4 hours per average day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Portland.

The city experiences its highest humidity in May, reaching 79%. In March, the humidity drops to its lowest level at 74%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year