Sisters (OR) Temperature by Month

Sisters in Oregon, United States of America sees significant seasonal temperature differences, with daytime highs between 4°C (39°F) in December and 30°C (86°F) in July, averaging 16°C (61°F) annually. Explore the full monthly breakdown below.

Depending on the time of the year, temperatures range from warm to cold in Sisters. Nighttime lows follow the same pattern, ranging from 7°C (45°F) to -6°C (21°F).

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

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak.

The chart below shows the average temperature throughout the year:

Sisters's average annual maximum temperature is 16°C (61°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.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

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

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 Sisters this rarely lasts long on the ground.

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