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

Pasadena, California Weather

August begins in scorching stillness. Day 43 of summer. Read this microseason across nine climate regions →

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

Pasadena, CA
Sunday, August 2 at 9:02 AM
77
°
Clear
Feels like
81°
Humidity
63%
Wind
1 mph
Sunrise
11:04 PM
Sunset
12:52 PM
Pasadena, CA
Hour by hour · 24h
24-Hour ForecastPasadena, CA: 24-hour forecast. Temperatures range from 62 to 95 degrees Fahrenheit.
L 62°H 95°
Pasadena, CA
7-day forecast
  1. Today
    Aug 2
    Mostly Clear
    —
    —
    95°65°—
  2. Monday
    Aug 3
    Mostly Clear
    —
    —
    94°62°-1°
  3. Tuesday
    Aug 4
    Clear
    —
    —
    96°64°+2°
  4. Wednesday
    Aug 5
    Clear
    —
    —
    95°76°-1°
  5. Thursday
    Aug 6
    Clear
    —
    —
    92°74°-3°
  6. Friday
    Aug 7
    Clear
    —
    —
    92°74°0°
  7. Saturday
    Aug 8
    Clear
    —
    —
    94°75°+2°
Pasadena, CA
Next 24 hours · Mild now
HOT 90°55°80°105°12p6p12a6anow 71°high 95°low 62°
Pasadena, CA
Anemometer · 24h winds · from true
NESW
From · True
SW
231° · veering 46°
Direction
SW
231°
Sustained
1
mph
Gust
2
mph
Peak 24h
8
avg 4 mph
Beaufort · 1 · LIGHT AIR
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 4 mph · pk 8 mph @ 6:00p
010MPHB1B2B3B4-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 91SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Pasadena, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
978.1
+1.0 mb in 3h · rising · 28.88 inHg
Now
978.1
mb
3h
+1.0
mb
12h
0.0
mb
24h
-2.8
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 977–981
970975980985990-21h-18h-15h-12h-9h-6h-3h-24hNOW981.3977.0978.0
The low is filling — pressure climbing out of storm territory.
Pasadena, CA
Air quality
69
AQI
Moderate
→-1 in 6h

AQI 69 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 18.6 µg/m³ (AQI 69) with a 0.85 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in stagnant air, not road dust.

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

PM 2.5DRIVERModerate
18.6μg/m³
PM 10Good
22μg/m³
NO₂Moderate
30μg/m³
OzoneGood
40μg/m³
UV IndexLow
1.2

What's driving it

PM × Wind × Precip

PM2.5 at 18.6 µg/m³ (AQI 69) with a 0.85 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in stagnant air, not road dust.

PM2.5/PM10
0.85
Wind
calm
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
Pasadena, CA
Sky cover · visibility · 24h
Cloud cover
2%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
53.8mi
UNLIMITED
125 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
16:02 UTC · Pasadena, 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
16:02 UTC · Pasadena, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Pasadena, CA
Satellite · infrared · animated
Pasadena, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Pasadena, CA
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:38 AM
Sunrise
11:04 PM
Daylight
13h 48m
Sunset
12:52 PM
Civil dusk
8:21 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Pasadena, CA
The moon
Waning Gibbous
84% illuminated
Moonrise
9:37 PM
Moonset
10:02 AM
In sign
♓︎ Pisces
Pasadena, CA
Microseason
Aug 1–5

August begins in scorching stillness

plant
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Pasadena at a glance

  • Today vs. normal: 9°F above the seasonal normal for this latitude
  • Last frost: March 12 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 91101, 91103, 91104, 91105, 91106, 91107, 91125

16-Day Forecast — Pasadena

  1. Sun95°65°0%
  2. Mon94°62°0%
  3. Tue96°64°0%
  4. Wed95°76°0%
  5. Thu92°74°0%
  6. Fri92°74°0%
  7. Sat94°75°0%
  8. Sun92°73°1%
  9. Mon90°73°1%
  10. Tue90°73°0%
  11. Wed89°73°0%
  12. Thu91°73°6%
  13. Fri92°74°10%
  14. Sat91°75°5%
  15. Sun93°75°6%
  16. Mon93°75°3%

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

Live wind & temperature near Pasadena

Right now in the garden

Peak growing season

As of August 2, 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.

Sun & seasons in Pasadena

Pasadena sits in Los Angeles County, where the year’s longest day runs 14h 26m of daylight and its shortest just 9h 52m — a swing of +4h 34m 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 16 miles to the WSW. The nearest town Pasadena tracks is Glendale, roughly 6 miles to the WNW.

Air quality in Pasadena’s county has trended cleaner since 2020; its cleanest year on record was 2023 (median AQI 67). See the full air-quality history for Pasadena.

January 1–5: New year in coastal mist.January 6–10: Hills hold the winter cold.January 11–15: Light lengthens over wet earth.January 16–20: The green pulse quickens.January 21–25: Spring green spreads inland.January 26–31: Winter's grip releases.February 1–5: Fog lifts, flowers open.February 6–10: Blooms erupt across chaparral.February 11–15: Winter blooms at their peak.February 16–20: Rivers recede, flowers spread.February 21–25: Earth warms, flowers rush upslope.February 26–28: Spring advances on cool winds.March 1–5: Grass and trees bud and break.March 6–10: Insects wake and feed.March 11–15: Blossoms crown the hillsides.March 16–20: Monarch chrysalis emergence.March 21–25: Light overtakes dark at equinox.March 26–31: California poppy ablaze.April 1–5: Spring rain feeds the seedlings.April 6–10: Warblers flood the understory.April 11–15: Allen's hummingbirds in courtship dives.April 16–20: Coastal fog settles; sun breaks midday.April 21–25: Oak canopies full and green.April 26–30: Chaparral awakens after spring rains.May 1–5: Coastal wildflowers at their peak.May 6–10: Gray whales complete their migration north.May 11–15: Redwood coast in cool shade.May 16–20: Fog and sun in daily rhythm.May 21–25: Summer approaches; hills turn gold.May 26–31: Dry season begins; tule fog in valleys.June 1–5: Coastal fog thickens at dawn.June 6–10: California poppies fade as heat rises.June 11–15: Summer solstice light stretched thin.June 16–20: Bay laurel fragrance sweetens shade.June 21–25: Longest daylight, driest air.June 26–30: Fog banks mask the turning tide.July 1–5: Summer heat deepens across the valleys.July 6–10: Warm winds drive dryness inland.July 11–15: Pacific high settles in firmly.July 16–20: Young hawks take to the thermals.July 21–25: Peak fire season, peak heat.July 26–31: Chaparral poised for ignition.August 1–5: August begins in scorching stillness.August 6–10: Autumn's first cool breath arrives.August 11–15: Cool winds signal the turning year.August 16–20: Evening cicada chorus.August 21–25: Marine layer descent.August 26–31: Monarch staging begins.September 1–5: Fire season intensity.September 6–10: Dew on drying grasses.September 11–15: Raptor passage begins.September 16–20: Equinox descent.September 21–25: Ceanothus blooms again.September 26–30: Insects retreat below.October 1–5: Creeks begin to whisper.October 6–10: Santa Ana wind season.October 11–15: Wildflower anticipation.October 16–20: Chaparral embers glow.October 21–25: First atmospheric river looms.October 26–31: Rains return at last.November 1–5: Coast live oak leaves turn amber.November 6–10: California lilac blooms in winter light.November 11–15: First rain greens the chaparral.November 16–20: Coastal fog thickens as storms approach.November 21–25: Thanksgiving rains swell the valleys.November 26–30: Autumn's last breath yields to winter.December 1–5: December arrives, storms accelerate.December 6–10: Winter solstice season intensifies.December 11–15: Deep winter: rivers at flood stage.December 16–20: Winter salmon runs peak in northern rivers.December 21–25: Winter solstice: the sun turns.December 26–31: Year's end in wind and rain.🌱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 · August 1–5

August begins in scorching stillness

Calm days dominate early August; temperatures peak; the entire ecosystem is in survival mode.

Day 214 of 365 · Wedge 43 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——
Marchlettuce, peas, spinach, radishes—
Aprillettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash—
Maytomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, 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

Pasadena's warmest month is August (~76°F mean) and its coldest is December (~55°F). Rainfall peaks in February (4.5 inches) and bottoms out in August (0.0 inches).

MonthMean tempPrecipRainy days
January56°3.6″5
February56°4.5″5
March59°2.8″4
April62°0.9″2
May65°0.4″1
June69°0.1″0
July74°0.0″0
August76°0.0″0
September74°0.1″0
October68°0.7″1
November60°0.8″2
December55°2.5″4

Regional context

Pasadena's climate, from NOAA NCEI 1991-2020 station normals, pairs 56°F Januarys with 74°F Julys — a 18°F swing. About 16.5 inches of precipitation falls over roughly 24 days a year.

Cool-season fronts carry Pasadena's rain: February logs 4.5 inches on 5.1 days, against August's 0.0 inches on 0.1 — winter does the heavy lifting in Pasadena. That groups Pasadena with places like Altadena, CA, San Pasqual, CA and San Marino, CA on the same cool-season storm track.

Pasadena rarely sees a hard freeze — its coldest month sits near 55°F — so planting spans most of the calendar. Heat peaks in August around 76°F, which confines cool-season crops to the shoulders of summer. Across Pasadena, elevation and tree cover drive a 4-7°F spread in Pasadena's overnight lows.

Similar climates: Altadena, CA, San Pasqual, CA, San Marino, CA, South Pasadena, CA, East Pasadena, CA.

Naturalist notes

In late May, juvenile Bewick’s wrens fledge from nest boxes and cavity nests across the Arroyo Seco, their noisy begging calls audible in the cool morning air.

By June, the spent flower stalks of foothill penstemon have dried to a crisp, and seeds begin to rattle loose when brushed by a hiker’s pant leg on chaparral trails.

Frequently asked

When does it freeze in Pasadena?
Frost typically leaves Pasadena by mid-March and returns to Pasadena near mid-December.
What is the rainy season in Pasadena?
February is the wettest month in Pasadena, about 4.5 inches on average; the year totals roughly 17 inches.
What is the warmest month in Pasadena?
On average August tops the year in Pasadena at about 76°F.
What is the coldest month in Pasadena?
The coldest stretch in Pasadena falls in December, around 55°F on average.
When can I start a vegetable garden in Pasadena?
In Pasadena, sow peas and hardy greens around mid-March; Pasadena's tomatoes and peppers wait two weeks more.
How many rainy days does Pasadena get?
Pasadena averages about 24 days with measurable rain or snow each year.
What hardiness zone is Pasadena?
With December around 55°F, Pasadena's zone reflects that minimum — the USDA ZIP map confirms Pasadena's band.
What is the 10-day forecast for Pasadena?
Pasadena'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?
See this week's day-by-day rain chances for Pasadena in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Pasadena?
Current conditions for Pasadena 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 forecast updated?
The Pasadena 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?
Today's sunrise and sunset times for Pasadena 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?
The next few days in Pasadena's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In Pasadena, California, the hot-summer Mediterranean climate runs from about 56°F in January to 74°F in July, a 18°F seasonal range.

Pasadena sees close to 17 inches of precipitation annually, falling across some 24 wet days.

Pasadena's 18°F range, set by its 34.2°N position, drives frost timing and what thrives in Pasadena.

All cities in California →

Los Angeles, CA weather →

ZIP codes in Pasadena

  • 91103
  • 91101
  • 91104
  • 91125
  • 91106
  • 91107
  • 91105
  • 91102
  • 91109
  • 91110
  • 91114
  • 91115
  • 91116
  • 91117
  • 91121
  • 91123
  • 91124
  • 91126
  • 91129
  • 91182
  • 91184
  • 91188
  • 91189
  • 91199

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.