Rohnert Park (CA) Temperature by Month

The average annual maximum temperature in Rohnert Park, California, United States of America is 22°C (72°F), with daytime highs ranging from 14°C (57°F) in December to 28°C (82°F) in September. This page covers monthly averages, day-night differences, and how Rohnert Park compares to cities worldwide.

In Rohnert Park, temperatures can shift dramatically between warm in summer and mild in winter. Nights follow the same pattern, with lows ranging from 10°C (50°F) in September to 3°C (37°F) in December.

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

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. September, the city's warmest month, averages 275 hours of sunshine.

The chart below shows the average temperature throughout the year:

Rohnert Park's average annual maximum temperature is 22°C (72°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

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