Rancho Mission Viejo is among the driest of U.S. towns: 12 inches of precipitation a year
High summer brings afternoon highs near 82°. In January, nights here are milder than in 95% of U.S. towns. Compared with 1901–2000, the average now sits 1.9° higher. Garden chairs stay out from September to July, the months with highs of 67–83°.
A year in Rancho Mission Viejo at a glance
Each month’s typical high and low, and what it brings.
What stands out about Rancho Mission Viejo’s climate
Compared with towns across the U.S., with Rancho Mission Viejo’s place in California beside it.
What a year in Rancho Mission Viejo feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Frost is rare
Frost and day counts come from NOAA’s station at Irvine Rch, CA, 17 miles from the town’s center, at about the same height.
The 2023 USDA map puts Rancho Mission Viejo’s center in zone 10b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 37°. Plant labels use the zone; frost dates tell you when to plant.
90° days by month
Average days at 90° or more
About 12 inches of rain a year
February is the wettest month and August the driest. Rain falls on about 31 days a year. Snow is rare: about 0.0" in a normal year at Laguna Beach, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Rancho Mission Viejo
37% of the work is heating, so air conditioning is the bigger bill. No month averages under 55°.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Irvine Rch, CA.
Living with Rancho Mission Viejo’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10b. Frost comes about 1 winter in 28, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, May, June, July, September, October, November and December. 59 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Rancho Mission Viejo from natural hazards, wildfire is the largest share (64%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Rancho Mission Viejo and its neighbors
Coto de Caza the hottest July afternoons (85°, 2° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Rancho Mission Viejo’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Rancho Mission Viejo, CA | 47° | 82° | 12" | 0.0" |
| Ewa Beach, HI | 62° | 87° | 17" | 0.0" |
| The Dalles, OR | 31° | 88° | 15" | 5.5" |
| Sierra Vista Southeast, AZ | 32° | 91° | 15" | 0.7" |
| Port Isabel, TX | 52° | 92° | 26" | 0.2" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Rancho Mission Viejo averaged 1.9° warmer than the 1900s. The biggest change is in January (+3.1°).
A bigger shift than in 85% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Rancho Mission Viejo compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Rancho Mission Viejo’s place among California’s.
Rancho Mission Viejo weather by month
Highs, lows and precipitation from NOAA’s grid at Rancho Mission Viejo’s center; snow, wet days and snow on the ground from Laguna Beach, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 68° | 47° | 2.7" | 0.0" | 6 | 0 | 54° – 64° |
| February | 67° | 47° | 3.2" | 0.0" | 7 | 0 | 51° – 66° |
| March | 68° | 48° | 1.6" | 0.0" | 4 | 0 | 51° – 66° |
| April | 71° | 50° | 0.8" | 0.0" | 3 | 0 | 57° – 64° |
| May | 73° | 54° | 0.3" | 0.0" | 1 | 0 | 59° – 70° |
| June | 77° | 57° | 0.1" | 0.0" | 1 | 0 | 64° – 72° |
| July | 82° | 61° | 0.0" | 0.0" | 0 | 0 | 69° – 78° |
| August | 85° | 62° | 0.0" | 0.0" | 0 | 0 | 70° – 77° |
| September | 83° | 60° | 0.1" | 0.0" | 1 | 0 | 69° – 76° |
| October | 78° | 56° | 0.4" | 0.0" | 2 | 0 | 62° – 72° |
| November | 73° | 51° | 0.8" | 0.0" | 3 | 0 | 56° – 66° |
| December | 67° | 47° | 1.9" | 0.0" | 4 | 0 | 54° – 64° |
| Year | 74° | 53° | 11.9" | 0.0" | 31 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 51° to 66°. August is the most reliable, staying within 7°.
Where Rancho Mission Viejo’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Rancho Mission Viejo’s center.
- Snow: Laguna Beach, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Irvine Rch, CA, 17 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Rancho Mission Viejo’s climate
What is the weather like in Rancho Mission Viejo?
A typical July afternoon reaches 82°, a January night drops to 47°, and snow is almost unheard of. Milder January nights than 95% of U.S. towns; cooler July afternoons than 79% of U.S. towns.
How cold does it get in Rancho Mission Viejo in winter?
December nights average 47°. A night at 32° or below comes in only some winters (0.7 a year on average). In the coldest December of the last 30 years the month averaged 54°.
How much snow does Rancho Mission Viejo get?
About 0.0 inches in a normal winter at Laguna Beach, CA, so most winters see none.
How hot does it get in Rancho Mission Viejo?
July, with a typical high of 82° and a low of 61°. About 62 days a year reach 90° and 8 reach 100° (Irvine Rch, CA).
When is the first and last frost in Rancho Mission Viejo?
Most years have no frost at all: a 32° night comes in about 4% of winters at Irvine Rch, CA, usually in December or January.
What growing zone is Rancho Mission Viejo in?
Zone 10b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 37°.
What is the best time of year to visit Rancho Mission Viejo?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, May, June, July, September, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Rancho Mission Viejo getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 85% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Rancho Mission Viejo.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.