Arcadia (CA) Temperature by Month
The average annual maximum temperature in Arcadia, California, United States of America is 27°C (81°F), with daytime highs ranging from 20°C (68°F) in December to 33°C (91°F) in August. This page covers monthly averages, day-night differences, and how Arcadia compares to cities worldwide.
Arcadia Monthly Temperatures
With significant temperature fluctuations, Arcadia enjoys distinct seasons year-round. Nighttime lows range from 18°C (64°F) in August to 8°C (46°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Arcadia 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. August, the city's warmest month, averages 347 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Arcadia vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Arcadia vs World: Temperature Compared
Arcadia's average annual maximum temperature is 27°C (81°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.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
What Does the Temperature Feel Like in Arcadia?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Arcadia, December is the coolest month, with average highs of 20°C (68°F) and humidity around 52% — considered moderate. In August, the warmest month, temperatures average 33°C (91°F) with 71% humidity — conditions that feel high. For a full picture, see our humidity page.
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 Arcadia this rarely lasts long on the ground.
For more on Arcadia's weather — including monthly rainfall, sunshine hours, and humidity — visit our Arcadia climate page.
