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Castle Hills, Texas Weather

Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →

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

Castle Hills, TX
Sunday, July 5 at 3:41 PM
95
°
Partly Cloudy
Feels like
104°
Humidity
44%
Wind
6 mph
Sunrise
1:39 AM
Sunset
3:37 PM
Castle Hills, TX
Hour by hour · 24h
24-Hour ForecastCastle Hills, TX: 24-hour forecast. Temperatures range from 75 to 96 degrees Fahrenheit.
L 75°H 96°
Castle Hills, TX
7-day forecast
  1. Today
    Jul 5
    Overcast
    —
    —
    96°77°—
  2. Monday
    Jul 6
    Overcast
    —
    —
    97°75°+1°
  3. Tuesday
    Jul 7
    Light Drizzle
    11%
    —
    98°75°+1°
  4. Wednesday
    Jul 8
    Overcast
    —
    —
    99°77°+1°
  5. Thursday
    Jul 9
    Clear
    —
    —
    100°76°+1°
  6. Friday
    Jul 10
    Overcast
    16%
    —
    93°75°-7°
  7. Saturday
    Jul 11
    Thunderstorm
    42%
    —
    89°76°-4°
Castle Hills, TX
Next 24 hours · Hot now
HOT 90°70°85°100°12p6p12a6anow 95°high 96°low 75°
Castle Hills, TX
Anemometer · 24h winds · from true
NESW
From · True
S
172° · veering 22°
Direction
S
172°
Sustained
6
mph
Gust
8
mph
Peak 24h
24
avg 6
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 6 · pk 24 @ 11:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 256SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Castle Hills, TX
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
984.6
-1.5 mb in 3h · falling · 29.08 inHg
Now
984.6
mb
3h
-1.5
mb
12h
-0.5
mb
24h
-0.3
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 983–987
9759809859909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW986.8983.1985.0
−24h−18h−12h−6hnow
Deep low still deepening — rough seas, strong wind, persistent rain.
Castle Hills, TX
Air quality
27
AQI
Good
→+3 in 6h▲Peak ~34 @ 11 PM

AQI 27 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 35 — 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.

PM 2.5Good
4.7μg/m³
PM 10Good
6μg/m³
NO₂Good
1μg/m³
OzoneDRIVERModerate
75μg/m³
UV IndexVery high
7.8

What's driving it

Ozone × UV × Sky

Ozone at AQI 35 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.

Present
AQI 35
UV peak
7.4 at earlier today
Sky at peak
partly cloudy
Projected peak
AQI 35

PM × Wind × Precip

PM2.5 at 4.7 µg/m³ (AQI 26) with a 0.77 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.77
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).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³330
Castle Hills, TX
Sky cover · visibility · 24h
Cloud cover
67%
PARTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
86.6mi
UNLIMITED
88 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
20:41 UTC · Castle Hills, TX · 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
20:41 UTC · Castle Hills, TX · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Castle Hills, TX
Satellite · infrared · animated
Castle Hills, TX
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Castle Hills, TX
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
6:13 AM
Sunrise
1:39 AM
Daylight
13h 58m
Sunset
3:37 PM
Civil dusk
9:06 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Castle Hills, TX
The moon
Waning Gibbous
69% illuminated
Moonrise
11:47 PM
Moonset
11:51 AM
In sign
♓︎ Pisces
Castle Hills, TX
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Castle Hills at a glance

  • Today vs. normal: 13°F above the seasonal normal for this latitude
  • Last frost: February 12 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Castle Hills

  1. Sun96°77°1%
  2. Mon97°75°5%
  3. Tue98°75°11%
  4. Wed99°77°3%
  5. Thu100°76°0%
  6. Fri93°75°16%
  7. Sat89°76°42%
  8. Sun92°74°25%
  9. Mon95°74°19%
  10. Tue99°77°7%
  11. Wed103°80°5%
  12. Thu104°78°11%
  13. Fri108°80°17%
  14. Sat112°83°13%
  15. Sun106°86°13%
  16. Mon101°82°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.

SPC Convective Outlook

Storm Prediction Center — Castle Hills

SPC includes Castle Hills in the general thunderstorm area today — no severe risk, but storms are possible.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3NONENo severe risk

Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: Frost quiets the live oaks.January 6–10: Still water thickens with ice.January 11–15: Springs begin to move beneath ice.January 16–20: Cardinal dawn calls grow bolder.January 21–25: Late January thaw pulses.January 26–31: Last freeze locks the land.February 1–5: February's lengthening light.February 6–10: Warming winds thaw the margin.February 11–15: Magnolia blooms break the gray.February 16–20: Mockingbirds resume the dawn chorus.February 21–25: Rain replaces the last snow.February 26–28: Mist clings to greening valleys.March 1–5: The green pulse awakens.March 6–10: Hibernators emerge to call.March 11–15: Dogwood and redbud ignite.March 16–20: Swallowtails emerge from winter silk.March 21–25: Light crowns the dogwood canopy.March 26–31: Redbud cascades over the thaw.April 1–5: Thunder announces the wet season.April 6–10: Barn swallows carve the warming sky.April 11–15: Magnolia blooms and falls in a breath.April 16–20: First rainbows arch over thunderheads.April 21–25: Reeds push through marsh water.April 26–30: Frost retreats; seedlings rise free.May 1–5: Warblers flood the canopy in waves.May 6–10: Tulip poplar lights the forest crown.May 11–15: Shad pulse upstream through rapids.May 16–20: Roses open on the Piedmont edge.May 21–25: Fireflies scout the humid dusk.May 26–31: Frog choruses rise from every wetland.June 1–5: Fireflies pulse through the magnolias.June 6–10: Kudzu climbs deeper into green.June 11–15: Sun climbs to its northern throne.June 16–20: Heat settles and the rain begins.June 21–25: The longest day turns toward shadow.June 26–30: Fireflies drift through Spanish moss.July 1–5: Cicadas claim the scorching afternoon.July 6–10: Thunderheads boil and break at dusk.July 11–15: Thunder builds each drowsy afternoon.July 16–20: Cicadas claim the long noon.July 21–25: Dog days drape the earth in haze.July 26–31: Katydids begin their rasping chorus.August 1–5: Dusk arrives one minute earlier each night.August 6–10: Meteorological summer's turning page.August 11–15: Cool winds gather at the margins.August 16–20: Dog-day cicadas rise.August 21–25: Heat breaks in creek beds.August 26–31: Monarchs gather strength.September 1–5: Harvests begin in earnest.September 6–10: Dew beads on resurrection fern.September 11–15: Raptors trail the thermals.September 16–20: Day and dark find balance.September 21–25: Thunder quiets the land.September 26–30: Insects retreat below.October 1–5: Swamp waters recede.October 6–10: Maples ignite the ridge.October 11–15: Asters crown the meadows.October 16–20: Crickets sing at dusk.October 21–25: Frost paints the garden.October 26–31: Light rains whisper down.November 1–5: Sweetgum Turns Crimson.November 6–10: Camellia Blooms Break Through.November 11–15: Earth Stiffens Underfoot.November 16–20: Bare Limbs Hold the Light.November 21–25: First Frost Grips the High Ground.November 26–30: North Wind Strips the Last Leaves.December 1–5: Darkness Falls Before Dinner.December 6–10: Winter Locks the Land.December 11–15: Wildlife Retreats to Shelter.December 16–20: Ice Edges Deepen Inward.December 21–25: The Sun Begins its Return.December 26–31: The Year Turns in Silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the scorching afternoon

Dog-day cicadas emerge in waves, their rasp dominating every sunny hour; heat peaks above 90 degrees daily.

Day 186 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
Februarylettuce, peas, spinach, radishes—
Marchlettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash—
Apriltomatoes, peppers, beans, squash—
Maytomatoes, peppers, beans, squashlettuce, peas, radishes
June—lettuce, peas, radishes
July—tomatoes, beans, summer squash
August—tomatoes, beans, summer squash
September—tomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
Novemberfall brassicas, garlic (overwinter), carrots—
December——

A year in weather

Castle Hills's warmest month is August (~85°F mean) and its coldest is January (~52°F). Rainfall peaks in May (3.6 inches) and bottoms out in July (1.6 inches).

MonthMean tempPrecipRainy days
January52°2.3″12
February55°2.1″13
March62°2.4″16
April69°3.5″17
May76°3.6″21
June82°2.5″15
July85°1.6″11
August85°1.8″12
September80°2.4″13
October72°2.6″12
November61°2.4″14
December53°2.0″13

Regional context

Per NOAA NCEI 1991-2020 normals, Castle Hills runs from a 52°F January mean to 85°F in July, a 33°F seasonal spread, with near 29.3 inches of precipitation across about 169 wet days.

No season owns Castle Hills's rain: May reaches 3.6 inches across 21.2 days and July keeps 1.6 inches on 10.6, an even spread through Castle Hills's year. It is a balanced pattern Castle Hills shares with places like Balcones Heights, TX, Olmos Park, TX and San Antonio, TX.

Hard freezes are rare in Castle Hills: the coldest month averages 52°F, so Castle Hills's growing window runs most of the year. August is the hottest stretch near 85°F, pushing cool-season crops to the milder shoulder months. Across Castle Hills, elevation and tree cover drive a 4-7°F spread in Castle Hills's overnight lows.

Similar climates: Balcones Heights, TX, Olmos Park, TX, San Antonio, TX, Alamo Heights, TX, Hill Country Village, TX.

Frequently asked

When does it freeze in Castle Hills?
In Castle Hills, expect the last spring frost near mid-February; Castle Hills's first autumn frost comes around mid-December.
What is the rainy season in Castle Hills?
Rainfall in Castle Hills peaks in May near 3.6 inches, out of about 29 inches annually.
What is the warmest month in Castle Hills?
August is Castle Hills's warmest month, averaging about 85°F.
What is the coldest month in Castle Hills?
Castle Hills bottoms out in January, with a mean near 52°F.
When can I start a vegetable garden in Castle Hills?
Time tomatoes in Castle Hills for two weeks after mid-February; peas and greens start at Castle Hills's frost line.
How many rainy days does Castle Hills get?
Expect roughly 169 wet days a year in Castle Hills.
What hardiness zone is Castle Hills?
Castle Hills sits in the USDA zone set by January lows near 52°F; the USDA ZIP tool gives the band.
What is the 10-day forecast for Castle Hills?
Castle Hills'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 Castle Hills?
See this week's day-by-day rain chances for Castle Hills in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Castle Hills?
Current conditions for Castle Hills and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Castle Hills forecast updated?
The Castle Hills forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Castle Hills?
Today's sunrise and sunset times for Castle Hills 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 Castle Hills?
The next few days in Castle Hills's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Castle Hills, Texas occupies a humid subtropical zone, with January means near 52°F and July around 85°F — a 33°F swing.

Yearly precipitation in Castle Hills totals around 29 inches, spread over about 169 days of rain or snow.

The 33°F gap between Castle Hills's summer and winter, at 29.5°N, shapes Castle Hills's frost calendar.

All cities in Texas →

San Antonio, TX weather →

ZIP codes in Castle Hills

  • 78213

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.