San Juan Capistrano, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
San Juan Capistrano weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——79°62°—
- MondayJul 6Overcast——79°61°0°
- TuesdayJul 7Foggy——83°61°+4°
- WednesdayJul 8Clear——86°67°+3°
- ThursdayJul 9Clear——86°68°0°
- FridayJul 10Overcast——83°68°-3°
- SaturdayJul 11Overcast——82°68°-1°
AQI 34 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.6 µg/m³ (AQI 52), ratio 0.69 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
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 32 now. With UV 12 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 50 around 1 PM.
- Present
- AQI 32
- UV peak
- 11.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 50
PM × Wind × Precip
PM2.5 at 9.6 µg/m³ (AQI 52), ratio 0.69 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.69
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:06 PM
- Moonset
- 11:09 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
San Juan Capistrano at a glance
- Today vs. normal: 77°F — typical for the season
- Last frost: March 8 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 92675
16-Day Forecast — San Juan Capistrano
- Sun79°62°0%
- Mon79°61°1%
- Tue83°61°0%
- Wed86°67°0%
- Thu86°68°0%
- Fri83°68°1%
- Sat82°68°1%
- Sun91°68°1%
- Mon90°68°6%
- Tue90°76°9%
- Wed90°74°7%
- Thu97°79°13%
- Fri97°78°13%
- Sat92°76°10%
- Sun92°76°19%
- Mon94°73°12%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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.
Microseason · July 1–5
Summer heat deepens across the valleys
Inland temperatures exceed 95°F regularly; fire danger reaches moderate to high across most of the region.
Day 186 of 365 · Wedge 37 of 72
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 is San Juan Capistrano's warmest stretch (~71°F) and December its coldest (~56°F); precipitation crests in February at 3.4 inches and ebbs in August to 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
In San Juan Capistrano, NOAA NCEI 1991-2020 normals put January near 56°F and July near 70°F — a 14°F seasonal arc — with about 12.7 inches of precipitation over 23 rainy or snowy days.
San Juan Capistrano's moisture rides winter storm tracks: February brings 3.4 inches over 5.3 wet days, while August sees only 0.0 inches across 0.0 days in the dry warm season. That cool-season-wet pattern aligns San Juan Capistrano with places like Dana Point, CA, Ladera Ranch, CA and Laguna Niguel, CA.
Hard freezes are rare in San Juan Capistrano: the coldest month averages 56°F, so San Juan Capistrano's growing window runs most of the year. August is the hottest stretch near 71°F, pushing cool-season crops to the milder shoulder months. San Juan Capistrano's coastal lots stay 4-7°F milder overnight than San Juan Capistrano's inland parcels.
Similar climates: Dana Point, CA, Ladera Ranch, CA, Laguna Niguel, CA, San Clemente, CA, Rancho Mission Viejo, CA.
Frequently asked
- When does it freeze in San Juan Capistrano?
- San Juan Capistrano's last spring frost lands near mid-March, and in San Juan Capistrano the first fall frost follows around mid-December.
- What is the rainy season in San Juan Capistrano?
- February is the wettest month in San Juan Capistrano, about 3.4 inches on average; the year totals roughly 13 inches.
- What is the warmest month in San Juan Capistrano?
- The warmest stretch in San Juan Capistrano comes in August, around 71°F on average.
- What is the coldest month in San Juan Capistrano?
- On average December is the chilliest month in San Juan Capistrano, about 56°F.
- When can I start a vegetable garden in San Juan Capistrano?
- Time tomatoes in San Juan Capistrano for two weeks after mid-March; peas and greens start at San Juan Capistrano's frost line.
- How many rainy days does San Juan Capistrano get?
- San Juan Capistrano averages about 23 days with measurable rain or snow each year.
- What hardiness zone is San Juan Capistrano?
- San Juan Capistrano sits in the USDA zone set by December lows near 56°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for San Juan Capistrano?
- San Juan Capistrano's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in San Juan Capistrano?
- See this week's day-by-day rain chances for San Juan Capistrano in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in San Juan Capistrano?
- Current conditions for San Juan Capistrano and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the San Juan Capistrano forecast updated?
- The San Juan Capistrano forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in San Juan Capistrano?
- Today's sunrise and sunset times for San Juan Capistrano are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for San Juan Capistrano?
- The next few days in San Juan Capistrano's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Climate
San Juan Capistrano's hot-summer Mediterranean climate in California pairs 56°F Januarys with 70°F Julys, 14°F apart across the seasons.
In a typical year San Juan Capistrano records about 13 inches of precipitation on around 23 days.
The 14°F gap between San Juan Capistrano's summer and winter, at 33.5°N, shapes San Juan Capistrano's frost calendar.
ZIP codes in San Juan Capistrano
- 92675
- 92693