Santa Clarita, California Weather
Equinox descent. Day 93 of summer. Read this microseason across nine climate regions →
Santa Clarita weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 5:54 PM PDT · Open-Meteo
- TodaySep 20Clear later——81°61°—
- MondaySep 21Foggy——76°58°-5°
- TuesdaySep 22Overcast——87°59°+11°
- WednesdaySep 23Clear——93°73°+6°
- ThursdaySep 24Clear——91°71°-2°
- FridaySep 25Mostly Clear——93°72°+2°
- SaturdaySep 26Overcast——92°74°-1°
Air quality now AQI 68 · Moderate
AQI 68 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 100 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
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 100 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 100
- UV peak
- 0.8 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 100
PM × Wind × Precip
PM2.5 at 14.7 µg/m³, PM10 at 17.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.83
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:14 PM
- Moonset
- 1:37 AM
- In sign
- ♑︎ Capricorn
Equinox descent
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Santa Clarita at a glance
- Today vs. normal: Today averages 71°F (high 81°F, low 61°F), 4°F below the 75°F normal for Sep 20
- Last frost: None in most years — 32°F in 37% of 1991–2020 years (NOAA station 9 km away)
- Microseason: Sep 16–20
- Planting calendar: September — plant lettuce, peas, spinach, radishes, beans, squash; harvest lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash
Live wind & temperature near Santa Clarita
Interactive wind and temperature map centered on Santa Clarita — it loads in your browser. Open the full weather map.
Right now in the garden
Year-round growing
As of September 21, sowing here runs through the year. Freezes are uncommon, so there is no frost date to plan around; heat and rainfall set the calendar instead. This city's planting calendar for September: plant lettuce, peas, spinach, radishes, beans, and squash; harvest lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Santa Clarita
Santa Clarita sits in Los Angeles County, where the year’s longest day runs 14h 27m of daylight and its shortest just 9h 51m — a swing of +4h 37m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Los Angeles, the state’s largest city, lies about 22 miles to the SSE. The nearest town Santa Clarita tracks is Simi Valley, roughly 18 miles to the SW.
Air quality in Santa Clarita
Air quality in Santa Clarita’s county has trended cleaner since 2020; its cleanest year on record was 2023 (median AQI 67). See the full air-quality history for Santa Clarita.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
| February | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
| March | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| May | lettuce, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, beans, summer squash |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash |
| July | lettuce, peas, tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| August | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| September | lettuce, peas, spinach, radishes, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| October | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| November | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| December | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
A year in weather
August is Santa Clarita's warmest stretch (~80°F) and December its coldest (~53°F); precipitation crests in February at 4.4 inches and ebbs in August to 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
Similar climates Stevenson Ranch, CA, Castaic, CA, San Fernando, CA
Drawing on NOAA NCEI 1991-2020 normals, Santa Clarita's January averages 55°F and July 79°F — 24°F apart — while precipitation totals roughly 16.8 inches over some 19 days.
Precipitation in Santa Clarita peaks in the cool season: February averages 4.4 inches across 5.1 storm-fed days, while August bottoms out at 0.0 inches over just 0.0 rainy days. That cool-season-wet pattern aligns Santa Clarita with places like Stevenson Ranch, CA, Castaic, CA and San Fernando, CA.
Santa Clarita rarely sees a hard freeze — its coldest month sits near 53°F — so planting spans most of the calendar. Heat peaks in August around 80°F, which confines cool-season crops to the shoulders of summer. Santa Clarita's open lawns chill fastest on clear nights.
Similar climates: Stevenson Ranch, CA, Castaic, CA, San Fernando, CA, Val Verde, CA, Hasley Canyon, CA.
Frequently asked
- When does it freeze in Santa Clarita?
- A freeze is the exception in Santa Clarita: the nearest NOAA station hit 32°F in 37% of 1991–2020 years, too few for a frost date in Santa Clarita.
- What is the rainy season in Santa Clarita?
- Rainfall in Santa Clarita peaks in February near 4.4 inches, out of about 17 inches annually.
- What is the warmest month in Santa Clarita?
- On average August tops the year in Santa Clarita at about 80°F.
- What is the coldest month in Santa Clarita?
- The coldest stretch in Santa Clarita falls in December, around 53°F on average.
- When can I start a vegetable garden in Santa Clarita?
- Santa Clarita has no frost date to wait for, so sowing runs year-round; lettuce and greens do best when Santa Clarita's coldest month settles near 53°F.
- How many rainy days does Santa Clarita get?
- Santa Clarita records around 19 days of measurable precipitation annually.
- What hardiness zone is Santa Clarita?
- Since December in Santa Clarita averages 53°F, Santa Clarita's USDA zone follows that floor — confirm it by ZIP.
- What is the 10-day forecast for Santa Clarita?
- Santa Clarita'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 Santa Clarita?
- See this week's day-by-day rain chances for Santa Clarita in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Santa Clarita?
- Current conditions for Santa Clarita and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Santa Clarita forecast updated?
- The Santa Clarita forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Santa Clarita?
- Today's sunrise and sunset times for Santa Clarita 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 Santa Clarita?
- The next few days in Santa Clarita's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Santa Clarita sits at 34.4°N; its climate zone is hot-summer Mediterranean (Köppen approximation).
ZIP codes in Santa Clarita
- 91321
- 91322
- 91350
- 91351
- 91354
- 91355
- 91382
- 91385
- 91386
- 91387
- 91390