Weather StoryAlmanac, microseasons, and the day's weather story.

Pasadena Hills, Missouri Weather

Cicadas claim the scorching afternoon. Day 13 of summer. Read this microseason across nine climate regions →

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

Pasadena Hills, MO
Friday, July 3 at 5:39 PM
89
°
Clear
Feels like
92°
Humidity
47%
Wind
6 mph
Sunrise
12:41 AM
Sunset
3:29 PM
Pasadena Hills, MO
Hour by hour · 24h
24-Hour ForecastPasadena Hills, MO: 24-hour forecast. Temperatures range from 73 to 94 degrees Fahrenheit.
L 73°H 94°
Pasadena Hills, MO
7-day forecast
  1. Today
    Jul 3
    Overcast
    17%
    —
    94°77°—
  2. Saturday
    Jul 4
    Light Drizzle
    18%
    0.02″
    92°73°-2°
  3. Sunday
    Jul 5
    Thunderstorm
    48%
    —
    92°71°0°
  4. Monday
    Jul 6
    Thunderstorm
    36%
    —
    88°72°-4°
  5. Tuesday
    Jul 7
    Light Drizzle
    —
    —
    87°71°-1°
  6. Wednesday
    Jul 8
    Overcast
    10%
    —
    93°71°+6°
  7. Thursday
    Jul 9
    Thunderstorm
    30%
    0.01″
    94°74°+1°
Pasadena Hills, MO
Next 24 hours · Hot now
HOT 90°68°83°98°12p6p12a6anow 94°high 94°low 73°PRECIP %
Pasadena Hills, MO
Anemometer · 24h winds · from true
NESW
From · True
NNE
022° · backing 149°
Direction
NNE
022°
Sustained
6
mph
Gust
9
mph
Peak 24h
16
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 16 @ 9:00a
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 269SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Pasadena Hills, MO
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
991.2
-1.3 mb in 3h · falling · 29.27 inHg
Now
991.2
mb
3h
-1.3
mb
12h
-1.1
mb
24h
-0.2
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 991–996
9859909951000STORM|RAIN-21h-18h-15h-12h-9h-6h-3h-24hNOW995.8992.3992.5
−24h−18h−12h−6hnow
Deep low still deepening — rough seas, strong wind, persistent rain.
Pasadena Hills, MO
Air quality
112
AQI
Unhealthy for Sensitive Groups
↑+66 in 6h

AQI 112 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 66 in the last 6 hours — air quality is degrading. Ozone at AQI 80 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.

PM 2.5Moderate
12.8μg/m³
PM 10Good
14μg/m³
NO₂Good
2μg/m³
OzoneDRIVERUnhealthy SG
125μg/m³
UV IndexModerate
2.2

What's driving it

Ozone × UV × Sky

Ozone at AQI 80 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

Present
AQI 80
UV peak
1.9 at earlier today
Sky at peak
clear
Projected peak
AQI 80

PM × Wind × Precip

PM2.5 at 12.8 µg/m³ (AQI 58) with a 0.89 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.89
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 TREND50100FRISATSUNMONTUEWEDTHUFRI7-DAY PM2.5 TREND · μg/m³330
Pasadena Hills, MO
Sky cover · visibility · 24h
Cloud cover
19%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
54.2mi
UNLIMITED
77 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
22:39 UTC · Pasadena Hills, MO · 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
22:39 UTC · Pasadena Hills, MO · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Pasadena Hills, MO
Satellite · infrared · animated
Pasadena Hills, MO
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Pasadena Hills, MO
Almanac · Friday, July 3
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:10 AM
Sunrise
12:41 AM
Daylight
14h 48m
Sunset
3:29 PM
Civil dusk
9:02 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Pasadena Hills, MO
The moon
Waning Gibbous
86% illuminated
Moonrise
10:28 PM
Moonset
9:04 AM
In sign
♒︎ Aquarius
Pasadena Hills, MO
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

bird
Jan 150% of the yearDec 31

Read this microseason across nine climate regions →

Pasadena Hills at a glance

  • Today vs. normal: 16°F above the seasonal normal for this latitude
  • Last frost: April 8 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Pasadena Hills

  1. Fri94°77°17%
  2. Sat92°73°18%
  3. Sun92°71°48%
  4. Mon88°72°36%
  5. Tue87°71°8%
  6. Wed93°71°10%
  7. Thu94°74°30%
  8. Fri89°73°30%
  9. Sat88°71°27%
  10. Sun84°71°16%
  11. Mon87°69°18%
  12. Tue91°74°29%
  13. Wed90°70°18%
  14. Thu97°74°26%
  15. Fri87°73°17%
  16. Sat79°64°19%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 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.

SPC Convective Outlook

Storm Prediction Center — Pasadena Hills

SPC has placed Pasadena Hills in the Marginal Risk category for severe thunderstorms today.

  • TODAYMRGLMarginal Risk
  • TOMORROWMRGLMarginal Risk
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

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 184 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——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

July is Pasadena Hills's warmest stretch (~81°F) and January its coldest (~31°F); precipitation crests in May at 4.4 inches and ebbs in January to 2.1 inches.

MonthMean tempPrecipRainy days
January31°2.1″13
February35°2.3″12
March45°4.0″16
April57°4.3″15
May66°4.4″17
June75°4.2″15
July81°2.7″13
August80°2.9″13
September72°2.6″11
October60°2.8″11
November45°3.6″13
December34°3.0″12

Frequently asked

When does it freeze in Pasadena Hills?
Pasadena Hills's last spring frost lands near mid-April, and in Pasadena Hills the first fall frost follows around mid-November.
What is the rainy season in Pasadena Hills?
Pasadena Hills sees its heaviest rain in May (around 4.4 inches), part of roughly 39 inches a year.
What is the warmest month in Pasadena Hills?
On average July tops the year in Pasadena Hills at about 81°F.
What is the coldest month in Pasadena Hills?
The coldest stretch in Pasadena Hills falls in January, around 31°F on average.
When can I start a vegetable garden in Pasadena Hills?
Hardy spring crops go in near mid-April in Pasadena Hills; tender peppers and squash wait 10–14 days.
How many rainy days does Pasadena Hills get?
Expect roughly 161 wet days a year in Pasadena Hills.
What hardiness zone is Pasadena Hills?
Because Pasadena Hills bottoms near 31°F in January, that winter low sets Pasadena Hills's USDA zone — verify by ZIP.
What is the 10-day forecast for Pasadena Hills?
Pasadena 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 Pasadena Hills?
See this week's day-by-day rain chances for Pasadena Hills in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Pasadena Hills?
Current conditions for Pasadena 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 Pasadena Hills forecast updated?
The Pasadena 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 Pasadena Hills?
Today's sunrise and sunset times for Pasadena 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 Pasadena Hills?
The next few days in Pasadena Hills's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a humid subtropical zone, Pasadena Hills, Missouri swings from 31°F in the heart of winter to 81°F at midsummer — a 50°F arc.

Yearly precipitation in Pasadena Hills totals around 39 inches, spread over about 161 days of rain or snow.

Pasadena Hills sits at 38.7°N; that 50°F seasonal swing frames planting windows and frost dates across Pasadena Hills.

All cities in Missouri →

St. Louis, MO weather →

ZIP codes in Pasadena Hills

  • 63121

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.