Aliso Viejo (CA) Temperature by Month
Aliso Viejo in California, United States of America sees moderate seasonal temperature shifts, with daytime highs between 19°C (66°F) in December and 30°C (86°F) in September, averaging 25°C (77°F) annually. Explore the full monthly breakdown below.
Aliso Viejo Monthly Temperatures
The climate in Aliso Viejo experiences moderate temperature changes, with mild shifts between seasons. At night, temperatures range from 17°C (63°F) in September to 8°C (46°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Aliso Viejo 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 290 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Aliso Viejo 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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Aliso Viejo vs World: Temperature Compared
Aliso Viejo's average annual maximum temperature is 25°C (77°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters — and seasons reversed compared to Europe.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
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.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Aliso Viejo's weather — including monthly rainfall, sunshine hours, and humidity — visit our Aliso Viejo climate page.
