Porterville (CA) Temperature by Month

Porterville in California, United States of America sees significant seasonal temperature differences, with daytime highs between 14°C (57°F) in December and 37°C (99°F) in July, averaging 26°C (79°F) annually. Explore the full monthly breakdown below.

Visitors to Porterville can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 19°C (66°F) in July to 3°C (37°F) in December.

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

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM.

The chart below shows the average temperature throughout the year:

Porterville's average annual maximum temperature is 26°C (79°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.

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

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.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Porterville this rarely lasts long on the ground.

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