Aliso Viejo, CA climate
Aliso Viejo has warm winters and pleasant summers, with very little rain. A typical July afternoon reaches 79°, a January night drops to 48°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Aliso Viejo feels like
Winter
Spring
Summer
Fall
Aliso Viejo weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 68° | 48° | 2.9" | 0 | 6 | 0 | 54° – 62° |
| February | 67° | 48° | 3.2" | 0 | 7 | 0 | 52° – 65° |
| March | 68° | 50° | 1.9" | 0 | 4 | 0 | 53° – 66° |
| April | 70° | 52° | 0.8" | 0 | 3 | 0 | 57° – 64° |
| May | 71° | 55° | 0.3" | 0 | 1 | 0 | 59° – 69° |
| June | 74° | 59° | 0.1" | 0 | 1 | 0 | 63° – 70° |
| July | 79° | 62° | 0.0" | 0 | 0 | 0 | 67° – 76° |
| August | 81° | 63° | 0.0" | 0 | 0 | 0 | 69° – 75° |
| September | 80° | 62° | 0.1" | 0 | 1 | 0 | 68° – 76° |
| October | 77° | 58° | 0.6" | 0 | 2 | 0 | 63° – 73° |
| November | 72° | 52° | 0.9" | 0 | 3 | 0 | 57° – 65° |
| December | 67° | 47° | 2.2" | 0 | 4 | 0 | 54° – 63° |
| Year | 73° | 55° | 12.8" | 0.0" | 31 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Aliso Viejo
Aliso Viejo gets 13 inches of rain and melted snow a year. February is the wettest month and August the driest. Rain or snow falls on about 31 days a year.
A year-round growing season
Heating and cooling a home in Aliso Viejo
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Aliso Viejo, 67% of that work is heating and 33% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Aliso Viejo and its neighbors
Aliso Viejo borders 4 towns with climate data. January nights across them vary by 0.5°. Laguna Hills has both the coldest January nights (47°) and the hottest July afternoons (82°). Aliso Viejo’s January low is 48° and its July high 79°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Aliso Viejo compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Aliso Viejo averaged 1.9° warmer than the 1900s. The biggest change is in January (+3.0°). The shift is larger than in 92% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Aliso Viejo’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 53° to 66°. August is the most reliable, staying within 6°.
Common questions about Aliso Viejo’s climate
What is the coldest month in Aliso Viejo?
December, with a typical high of 67° and a low of 47°.
What is the hottest month in Aliso Viejo?
August, with a typical high of 81° and a low of 63°. About 4 days a year reach 90°.
How much snow does Aliso Viejo get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Aliso Viejo?
Frost is uncommon. Only 20% of years see a night at 32° or below.
What is the rainiest month in Aliso Viejo?
February, with 3.2 inches of rain and melted snow. The year totals 13 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Aliso Viejo itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Laguna Beach, CA (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.