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Acalanes Ridge, California Weather

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

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

Acalanes Ridge, CA
Sunday, July 5 at 10:02 AM
66
°
Clear
Feels like
64°
Humidity
67%
Wind
10 mph
Sunrise
10:51 PM
Sunset
1:33 PM
Acalanes Ridge, CA
Hour by hour · 24h
24-Hour ForecastAcalanes Ridge, CA: 24-hour forecast. Temperatures range from 53 to 73 degrees Fahrenheit.
L 53°H 73°
Acalanes Ridge, CA
7-day forecast
  1. Today
    Jul 5
    Partly Cloudy
    —
    —
    73°54°—
  2. Monday
    Jul 6
    Overcast
    —
    —
    71°53°-2°
  3. Tuesday
    Jul 7
    Overcast
    —
    —
    74°51°+3°
  4. Wednesday
    Jul 8
    Overcast
    —
    —
    83°50°+9°
  5. Thursday
    Jul 9
    Overcast
    —
    —
    82°52°-1°
  6. Friday
    Jul 10
    Overcast
    —
    —
    86°50°+4°
  7. Saturday
    Jul 11
    Overcast
    —
    —
    90°53°+4°
Acalanes Ridge, CA
Next 24 hours · Mild now
48°63°78°6a12p6p12anow 66°high 73°low 53°
Acalanes Ridge, CA
Anemometer · 24h winds · from true
NESW
From · True
WSW
242° · backing 17°
Direction
WSW
242°
Sustained
10
mph
Gust
15
mph
Peak 24h
20
avg 8
Beaufort · 3 · GENTLE 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 20 @ 2:00a
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 1911SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 17° from the wsw.
Acalanes Ridge, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
997.3
+0.9 mb in 3h · rising · 29.45 inHg
Now
997.3
mb
3h
+0.9
mb
12h
+0.6
mb
24h
-0.4
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 996–998
9909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW997.8995.7997.3
−24h−18h−12h−6hnow
The low is filling — pressure climbing out of storm territory.
Acalanes Ridge, CA
Air quality
30
AQI
Good
→-3 in 6h

AQI 30 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 5.1 µg/m³, PM10 at 6.6 µg/m³ — typical background levels with no transport signature.

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

PM 2.5DRIVERGood
5.1μg/m³
PM 10Good
7μg/m³
NO₂Good
5μg/m³
OzoneGood
47μg/m³
UV IndexModerate
3.6

What's driving it

PM × Wind × Precip

PM2.5 at 5.1 µg/m³, PM10 at 6.6 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.77
Wind
breezy
Recent rain
0h in last 6h
Pattern
background

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/m³300
Acalanes Ridge, CA
Sky cover · visibility · 24h
Cloud cover
7%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
57.3mi
UNLIMITED
124 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
17:02 UTC · Acalanes Ridge, 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
17:02 UTC · Acalanes Ridge, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Acalanes Ridge, CA
Satellite · infrared · animated
Acalanes Ridge, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Acalanes Ridge, CA
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:21 AM
Sunrise
10:51 PM
Daylight
14h 42m
Sunset
1:33 PM
Civil dusk
9:06 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Acalanes Ridge, CA
The moon
Waning Gibbous
71% illuminated
Moonrise
11:27 PM
Moonset
11:27 AM
In sign
♓︎ Pisces
Acalanes Ridge, 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 →

Acalanes Ridge at a glance

  • Today vs. normal: 8°F below the seasonal normal for this latitude
  • Last frost: April 3 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Acalanes Ridge

  1. Sun73°54°2%
  2. Mon71°53°1%
  3. Tue74°51°4%
  4. Wed83°50°0%
  5. Thu82°52°0%
  6. Fri86°50°0%
  7. Sat90°53°0%
  8. Sun94°54°1%
  9. Mon101°62°3%
  10. Tue98°61°5%
  11. Wed83°61°0%
  12. Thu94°68°3%
  13. Fri102°68°0%
  14. Sat105°70°3%
  15. Sun97°56°0%
  16. Mon85°53°3%

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.

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 · July 1–5

Summer heat deepens across the valleys

Inland temperatures exceed 95°F regularly; fire danger reaches moderate to high across most of the region.

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——
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 Acalanes Ridge's warmest stretch (~70°F) and January its coldest (~49°F); precipitation crests in January at 3.5 inches and ebbs in July to 0.0 inches.

MonthMean tempPrecipRainy days
January49°3.5″13
February51°3.3″12
March53°2.7″13
April58°1.4″9
May64°0.5″4
June68°0.0″1
July70°0.0″1
August70°0.0″1
September69°0.1″1
October64°0.6″4
November55°2.2″8
December49°3.2″12

Frequently asked

When does it freeze in Acalanes Ridge?
In Acalanes Ridge, expect the last spring frost near mid-April; Acalanes Ridge's first autumn frost comes around mid-November.
What is the rainy season in Acalanes Ridge?
January is the wettest month in Acalanes Ridge, about 3.5 inches on average; the year totals roughly 18 inches.
What is the warmest month in Acalanes Ridge?
On average July tops the year in Acalanes Ridge at about 70°F.
What is the coldest month in Acalanes Ridge?
The coldest stretch in Acalanes Ridge falls in January, around 49°F on average.
When can I start a vegetable garden in Acalanes Ridge?
In Acalanes Ridge, sow peas and hardy greens around mid-April; Acalanes Ridge's tomatoes and peppers wait two weeks more.
How many rainy days does Acalanes Ridge get?
Acalanes Ridge records around 79 days of measurable precipitation annually.
What hardiness zone is Acalanes Ridge?
Since January in Acalanes Ridge averages 49°F, Acalanes Ridge's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Acalanes Ridge?
Acalanes Ridge'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 Acalanes Ridge?
See this week's day-by-day rain chances for Acalanes Ridge in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Acalanes Ridge?
Current conditions for Acalanes Ridge and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Acalanes Ridge forecast updated?
The Acalanes Ridge forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Acalanes Ridge?
Today's sunrise and sunset times for Acalanes Ridge 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 Acalanes Ridge?
The next few days in Acalanes Ridge's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

The hot-summer Mediterranean climate of Acalanes Ridge, California carries typical Januarys near 49°F and Julys around 70°F — 21°F of seasonal travel.

Rain and snow bring Acalanes Ridge roughly 18 inches a year across approximately 79 measurable-precipitation days.

From 37.9°N, Acalanes Ridge sees a 21°F seasonal swing that governs Acalanes Ridge's planting and frost windows.

All cities in California →

Walnut Creek, CA weather →

ZIP codes in Acalanes Ridge

  • 94597

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.