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Knightsen, California Weather

Summer solstice light stretched thin. Day 88 of spring. Read this microseason across nine climate regions →

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

Knightsen, CA
Monday, June 15 at 4:24 AM
62
°
Clear
Feels like
61°
Humidity
71%
Wind
4 mph
Sunrise
10:43 PM
Sunset
1:30 PM
Knightsen, CA
Hour by hour · 24h
24-Hour ForecastKnightsen, CA: 24-hour forecast. Temperatures range from 60 to 96 degrees Fahrenheit.
L 60°H 96°
Knightsen, CA
7-day forecast
  1. Today
    Jun 15
    Clear
    —
    —
    96°60°—
  2. Tuesday
    Jun 16
    Clear
    —
    —
    94°61°-2°
  3. Wednesday
    Jun 17
    Clear
    —
    —
    100°60°+6°
  4. Thursday
    Jun 18
    Clear
    —
    —
    96°57°-4°
  5. Friday
    Jun 19
    Clear
    —
    —
    91°53°-5°
  6. Saturday
    Jun 20
    Clear
    —
    —
    89°49°-2°
  7. Sunday
    Jun 21
    Clear
    —
    —
    97°51°+8°
Knightsen, CA
Next 24 hours · Cool now
HOT 90°50°78°105°12a6a12p6pnow 62°high 96°low 60°
Knightsen, CA
Anemometer · 24h winds · from true
NESW
From · True
NW
313° · backing 148°
Direction
NW
313°
Sustained
4
mph
Gust
8
mph
Peak 24h
18
avg 8
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 8 · pk 18 @ 11:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 142SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 148° from the nw.
Knightsen, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1012.4
+0.4 mb in 3h · steady · 29.90 inHg
Now
1012.4
mb
3h
+0.4
mb
12h
+1.5
mb
24h
+2.3
mb
Regime · CHANGE
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1010–1012
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1012.41010.11012.4
−24h−18h−12h−6hnow
Air sits at the threshold — small shifts decide the day.
Knightsen, CA
Air quality
50
AQI
Good
→-2 in 6h

AQI 50 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.5 µg/m³ (AQI 54) with a 0.72 fine-to-coarse ratio and 4 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
10.5μg/m³
PM 10Good
15μg/m³
NO₂Good
10μg/m³
OzoneGood
45μg/m³
UV IndexLow
0.0

What's driving it

PM × Wind × Precip

PM2.5 at 10.5 µg/m³ (AQI 54) with a 0.72 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.72
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 TREND50100MONTUEWEDTHUFRISATSUNMON7-DAY PM2.5 TREND · μg/m³300
Knightsen, CA
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
45.5mi
UNLIMITED
127 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
11:24 UTC · Knightsen, 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
11:24 UTC · Knightsen, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Knightsen, CA
Satellite · infrared · animated
Knightsen, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Knightsen, CA
Almanac · Monday, June 15
A summer fog for fair, a winter fog for rain.
Civil dawn
5:13 AM
Sunrise
10:43 PM
Daylight
14h 47m
Sunset
1:30 PM
Civil dusk
9:03 PM
Planting note
Stake and prune tomato suckers. Watch for squash vine borers.
Knightsen, CA
The moon
New Moon
0% illuminated
Moonrise
5:54 AM
Moonset
8:51 PM
In sign
♊︎ Gemini
Knightsen, CA
Microseason
Jun 11–15

Summer solstice light stretched thin

weather
Jan 145% of the yearDec 31

Read this microseason across nine climate regions →

Knightsen at a glance

  • Today vs. normal: 15°F below the seasonal normal for this latitude
  • Last frost: April 4 (climatological average for this latitude)
  • Microseason: Jun 11–15
  • Planting window: Stake and prune tomato suckers. Watch for squash vine borers.

15-Day Forecast — Knightsen

  1. Mon96°60°0%
  2. Tue94°61°0%
  3. Wed100°60°0%
  4. Thu96°57°0%
  5. Fri91°53°0%
  6. Sat89°49°0%
  7. Sun97°51°0%
  8. Mon99°56°0%
  9. Tue102°58°0%
  10. Wed95°51°0%
  11. Thu92°50°0%
  12. Fri93°53°0%
  13. Sat91°52°0%
  14. Sun94°53°3%
  15. Mon99°54°0%

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

Right now in the garden

Peak growing season

As of June 15, 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.

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 · June 11–15

Summer solstice light stretched thin

The sun's arc peaks; evening light lingers until past 8:30pm across the coast and Bay Area.

Day 166 of 365 · Wedge 33 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

The year in Knightsen tops out in July (~76°F) and dips lowest in January (~48°F), with January wettest at 2.7 inches and July driest at 0.0 inches.

MonthMean tempPrecipRainy days
January48°2.7″6
February52°2.4″6
March57°1.9″5
April61°0.9″2
May67°0.4″1
June73°0.1″0
July76°0.0″0
August75°0.0″0
September73°0.1″0
October66°0.4″1
November55°1.2″3
December48°2.5″6

Regional context

Knightsen's climate, from NOAA NCEI 1991-2020 station normals, pairs 48°F Januarys with 76°F Julys — a 28°F swing. About 12.6 inches of precipitation falls over roughly 30 days a year.

Cool-season fronts carry Knightsen's rain: January logs 2.7 inches on 6.4 days, against July's 0.0 inches on 0.0 — winter does the heavy lifting in Knightsen. It is a winter-storm rhythm Knightsen shares with places like Oakley, CA, Brentwood, CA and Bethel Island, CA.

Knightsen rarely sees a hard freeze — its coldest month sits near 48°F — so planting spans most of the calendar. Heat peaks in July around 76°F, which confines cool-season crops to the shoulders of summer. Knightsen's coastal lots stay 4-7°F milder overnight than Knightsen's inland parcels.

Similar climates: Oakley, CA, Brentwood, CA, Bethel Island, CA, Discovery Bay, CA, Byron, CA.

Frequently asked

When does it freeze in Knightsen?
Knightsen's last spring frost lands near mid-April, and in Knightsen the first fall frost follows around mid-November.
What is the rainy season in Knightsen?
January is the wettest month in Knightsen, about 2.7 inches on average; the year totals roughly 13 inches.
What is the warmest month in Knightsen?
On average July tops the year in Knightsen at about 76°F.
What is the coldest month in Knightsen?
The coldest stretch in Knightsen falls in January, around 48°F on average.
When can I start a vegetable garden in Knightsen?
Hardy spring crops go in near mid-April in Knightsen; tender peppers and squash wait 10–14 days.
How many rainy days does Knightsen get?
Knightsen records around 30 days of measurable precipitation annually.
What hardiness zone is Knightsen?
Since January in Knightsen averages 48°F, Knightsen's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Knightsen?
Knightsen'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 Knightsen?
See this week's day-by-day rain chances for Knightsen in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Knightsen?
Current conditions for Knightsen and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Knightsen forecast updated?
The Knightsen forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Knightsen?
Day length in Knightsen peaks around the June solstice — earliest sunrise and latest sunset — and is shortest near the December solstice.
How accurate is the weather forecast for Knightsen?
The next few days in Knightsen's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a hot-summer Mediterranean zone, Knightsen, California swings from 48°F in the heart of winter to 76°F at midsummer — a 28°F arc.

Rain and snow bring Knightsen roughly 13 inches a year across approximately 30 measurable-precipitation days.

Knightsen sits at 38.0°N; that 28°F seasonal swing frames planting windows and frost dates across Knightsen.

All cities in California →

Brentwood, CA weather →

ZIP codes in Knightsen

  • 94548
  • 94513

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.