Mission Viejo, California Weather
Coastal fog thickens at dawn. Day 76 of spring. Read this microseason across nine climate regions →
Mission Viejo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——81°60°—
- ThursdayJun 4Foggy——81°57°0°
- FridayJun 5Foggy——76°58°-5°
- SaturdayJun 6Overcast——72°59°-4°
- SundayJun 7Overcast——70°57°-2°
- MondayJun 8Overcast——73°57°+3°
- TuesdayJun 9Overcast——76°58°+3°
PM2.5 at 19.3 µg/m³ (AQI 70) with a 0.67 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 66 now. With UV 9.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 82 by mid-afternoon.
- Present
- AQI 66
- UV peak
- 9.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 82
PM × Wind × Precip
PM2.5 at 19.3 µg/m³ (AQI 70) with a 0.67 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.67
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 5:24 AM
- Moonset
- 3:15 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Mission Viejo at a glance
- Today vs. normal: 7°F below the seasonal normal for this latitude
- Last frost: March 9 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
August brings Mission Viejo's highest temperatures at around 71°F mean, while December delivers the coolest readings at 56°F. February sees peak rainfall with 3.4 inches, contrasting sharply with August's bone-dry 0.0 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 56° | 2.8″ | 5 |
| February | 56° | 3.4″ | 5 |
| March | 59° | 1.6″ | 3 |
| April | 61° | 0.8″ | 2 |
| May | 65° | 0.2″ | 1 |
| June | 67° | 0.1″ | 1 |
| July | 70° | 0.1″ | 0 |
| August | 71° | 0.0″ | 0 |
| September | 70° | 0.2″ | 0 |
| October | 66° | 0.5″ | 1 |
| November | 60° | 1.1″ | 1 |
| December | 56° | 1.9″ | 3 |
Regional context
Located within a hot-summer Mediterranean climate region, Mission Viejo shares temperature ranges, seasonal patterns, and growing conditions with other nearby cities in this climate cohort.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
California poppies typically begin their peak bloom in late April, painting hillsides orange across Mission Viejo's Mediterranean landscape.
Allen's hummingbirds start their northward migration through the area in late February, often arriving just as the first wildflowers open.
Frequently asked
- When does it freeze in Mission Viejo?
- Spring's final frost usually occurs around mid-March in Mission Viejo, while the season's first frost returns around mid-December.
- What is the rainy season in Mission Viejo?
- February brings the heaviest rainfall, averaging about 3.4 inches, while the city receives roughly 13 inches total each year.
- What is the warmest month in Mission Viejo?
- August typically records the highest temperatures, averaging about 71°F.
- What is the coldest month in Mission Viejo?
- December usually brings the coolest weather, averaging about 56°F.
- When can I start a vegetable garden in Mission Viejo?
- Cool-season crops like peas and lettuce can go in the ground around the last spring frost in mid-March, while warm-season crops such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Mission Viejo get?
- Mission Viejo sees about 23 rainy days per year on average.
- What hardiness zone is Mission Viejo?
- Mission Viejo's USDA hardiness zone depends on its lowest average winter temperature; use the USDA's online lookup tool with the city ZIP code for current zone designation.
Climate
Mission Viejo, California experiences a hot-summer Mediterranean climate zone. Temperatures hover near 56°F in January and reach an average of 70°F in July, creating a 14°F seasonal swing.
Annual precipitation totals about 13 inches, falling across roughly 23 rainy days throughout the year.
Weather patterns follow the city's latitude at 33.6°N, along with its proximity to large water bodies and elevation. These factors determine what grows in the area, frost timing, and daily weather conditions.