Buellton (CA) Temperature by Month

The average annual maximum temperature in Buellton, California, United States of America is 23°C (73°F), with daytime highs ranging from 18°C (64°F) in December to 27°C (81°F) in September. This page covers monthly averages, day-night differences, and how Buellton compares to cities worldwide.

The weather in Buellton changes moderately throughout the year, offering enough variation to appreciate each season. Nights are cooler, with lows ranging from 11°C (52°F) to 4°C (39°F).

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

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. September, the warmest month, averages 270 hours of sunshine.

The chart below shows the average temperature throughout the year:

Buellton's average annual maximum temperature is 23°C (73°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.

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

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

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

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 Buellton this rarely lasts long on the ground.

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