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Castaic, California Weather

Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →

Castaic weather forecast — hour by hour, 7-day outlook, NOAA radar

Castaic, CA
Sunday, July 5 at 9:59 AM
78
°
Mostly Clear
Feels like
79°
Humidity
45%
Wind
6 mph
Sunrise
10:47 PM
Sunset
1:10 PM
Castaic, CA
Hour by hour · 24h
24-Hour ForecastCastaic, CA: 24-hour forecast. Temperatures range from 60 to 85 degrees Fahrenheit.
L 60°H 85°
Castaic, CA
7-day forecast
  1. Today
    Jul 5
    Overcast
    85°63°
  2. Monday
    Jul 6
    Clear
    86°60°+1°
  3. Tuesday
    Jul 7
    Clear
    94°64°+8°
  4. Wednesday
    Jul 8
    Clear
    97°67°+3°
  5. Thursday
    Jul 9
    Clear
    99°69°+2°
  6. Friday
    Jul 10
    Clear
    97°64°-2°
  7. Saturday
    Jul 11
    Overcast
    96°64°-1°
Castaic, CA
Anemometer · 24h winds · from true
NESW
From · True
SSW
211° · veering 29°
Direction
SSW
211°
Sustained
6
mph
Gust
7
mph
Peak 24h
17
avg 7
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 · pk 17 @ 3:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 181SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Castaic, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
954.6
+1.5 mb in 3h · rising · 28.19 inHg
Now
954.6
mb
3h
+1.5
mb
12h
-0.3
mb
24h
-2.1
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 954958
945950955960965-21h-18h-15h-12h-9h-6h-3h-24hNOW957.7953.5955.0
−24h−18h−12h−6hnow
The low is filling — pressure climbing out of storm territory.
Castaic, CA
Air quality
45
AQI
Good
-2 in 6h

AQI 45 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.8 µg/m³ (AQI 54) with a 0.79 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERGood
10.8μg/m³
PM 10Good
14μg/m³
NO₂Good
5μg/m³
OzoneGood
56μg/m³
UV IndexModerate
3.9

What's driving it

PM × Wind × Precip

PM2.5 at 10.8 µg/m³ (AQI 54) with a 0.79 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.79
Wind
light
Recent rain
0h in last 6h
Pattern
stagnant smoke
Castaic, CA
Sky cover · visibility · 24h
Cloud cover
37%
MOSTLY CLEAR
100%0%−24h−18h−12h−6hnow

Visibility
84.4mi
UNLIMITED
185 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
16:59 UTC · Castaic, CA · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
16:59 UTC · Castaic, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Castaic, CA
Satellite · infrared · animated
Castaic, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Castaic, CA
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:19 AM
Sunrise
10:47 PM
Daylight
14h 23m
Sunset
1:10 PM
Civil dusk
8:41 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Castaic, CA
The moon
Waning Gibbous
71% illuminated
Moonrise
11:11 PM
Moonset
11:13 AM
In sign
♓︎ Pisces
Castaic, CA
Microseason
Jul 1–5

Summer heat deepens across the valleys

weather
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Castaic at a glance

  • Today vs. normal: 78°F — typical for the season
  • Last frost: March 14 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP code: 91384

16-Day Forecast — Castaic

  1. Sun85°63°1%
  2. Mon86°60°0%
  3. Tue94°64°0%
  4. Wed97°67°0%
  5. Thu99°69°0%
  6. Fri97°64°0%
  7. Sat96°64°1%
  8. Sun99°67°1%
  9. Mon100°67°4%
  10. Tue98°71°7%
  11. Wed99°73°1%
  12. Thu101°74°10%
  13. Fri108°78°9%
  14. Sat116°84°6%
  15. Sun99°76°10%
  16. Mon100°70°10%

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.

ZIP codes in Castaic

  • 91384
  • 91310

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.