Santa Clarita, California Weather
Coastal fog thickens at dawn. Day 76 of spring. Read this microseason across nine climate regions →
Santa Clarita weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——91°56°—
- ThursdayJun 4Clear——92°61°+1°
- FridayJun 5Overcast——91°61°-1°
- SaturdayJun 6Overcast——82°66°-9°
- SundayJun 7Clear——82°61°0°
- MondayJun 8Overcast——87°61°+5°
- TuesdayJun 9Partly Cloudy——87°67°0°
Ozone at AQI 95 now. AQI flat over the last 6 hours (within ±3 points). With UV 10 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 92 by mid-afternoon.
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 95 now. With UV 10 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 92 by mid-afternoon.
- Present
- AQI 95
- UV peak
- 10.2 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 92
PM × Wind × Precip
PM2.5/PM10 ratio 0.57 with 10 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.57
- Wind
- breezy
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:30 AM
- Moonset
- 3:16 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Santa Clarita at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: March 14 (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 Santa Clarita's peak warmth (~80°F mean) while December delivers the coldest temperatures (~53°F). February sees maximum rainfall (4.4 inches) and August remains completely dry (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 55° | 4.2″ | 3 |
| February | 55° | 4.4″ | 5 |
| March | 59° | 2.9″ | 3 |
| April | 61° | 0.8″ | 2 |
| May | 67° | 0.3″ | 1 |
| June | 72° | 0.0″ | 0 |
| July | 79° | 0.0″ | 0 |
| August | 80° | 0.0″ | 0 |
| September | 77° | 0.1″ | 0 |
| October | 69° | 0.5″ | 1 |
| November | 60° | 0.8″ | 2 |
| December | 53° | 2.6″ | 3 |
Regional context
A hot-summer Mediterranean climate characterizes Santa Clarita and surrounding cities. This climate type creates shared temperature ranges, seasonal patterns, and growing conditions across the region.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
California poppies begin their spring bloom in late March as soil temperatures warm.
Red-winged blackbirds establish territories in nearby wetlands during April migration periods.
Frequently asked
- When does it freeze in Santa Clarita?
- Mid-March typically marks Santa Clarita's last spring frost, while the first fall frost occurs around mid-December.
- What is the rainy season in Santa Clarita?
- February delivers the heaviest rainfall with about 4.4 inches on average; annual precipitation reaches roughly 17 inches.
- What is the warmest month in Santa Clarita?
- August records the highest temperatures, averaging about 80°F.
- What is the coldest month in Santa Clarita?
- December brings the lowest temperatures, averaging about 53°F.
- When can I start a vegetable garden in Santa Clarita?
- Plant cool-season crops (peas, lettuce) around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) should wait 1–2 weeks after.
- How many rainy days does Santa Clarita get?
- Santa Clarita experiences about 19 rainy days per year on average.
- What hardiness zone is Santa Clarita?
- Check the USDA's online lookup with the city ZIP for Santa Clarita's current hardiness zone designation, which depends on lowest average winter temperatures.
Climate
Santa Clarita, California experiences a hot-summer Mediterranean climate zone. January temperatures hover near 55°F while July averages 79°F — a 24°F seasonal swing.
Annual precipitation totals about 17 inches across roughly 19 rainy days in Santa Clarita.
Several factors determine the local weather patterns: latitude (34.4°N), proximity to large water bodies, and elevation. These elements influence plant growth, frost timing, and daily weather conditions.