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Santa Rosa, California Weather

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

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

Santa Rosa, CA
Sunday, August 2 at 8:00 AM
59
°
Partly Cloudy
Feels like
60°
Humidity
84%
Wind
2 mph
Sunrise
11:14 PM
Sunset
1:19 PM
Santa Rosa, CA
Hour by hour · 24h
24-Hour ForecastSanta Rosa, CA: 24-hour forecast. Temperatures range from 59 to 98 degrees Fahrenheit.
L 59°H 98°
Santa Rosa, CA
7-day forecast
  1. Today
    Aug 2
    Foggy
    —
    —
    98°52°—
  2. Monday
    Aug 3
    Clear
    —
    —
    96°60°-2°
  3. Tuesday
    Aug 4
    Clear
    —
    —
    96°58°0°
  4. Wednesday
    Aug 5
    Clear
    —
    —
    93°61°-3°
  5. Thursday
    Aug 6
    Clear
    —
    —
    92°60°-1°
  6. Friday
    Aug 7
    Clear
    —
    —
    95°62°+3°
  7. Saturday
    Aug 8
    Clear
    —
    —
    103°63°+8°
Santa Rosa, CA
Next 24 hours · Cool now
HOT 90°50°80°110°12p6p12a6anow 59°high 98°low 59°
Santa Rosa, CA
Anemometer · 24h winds · from true
NESW
From · True
NE
056° · backing 124°
Direction
NE
056°
Sustained
2
mph
Gust
2
mph
Peak 24h
10
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 10 mph @ 3:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 135SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Santa Rosa, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1004.1
+0.9 mb in 3h · rising · 29.65 inHg
Now
1004.1
mb
3h
+0.9
mb
12h
+0.3
mb
24h
-3.6
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1003–1008
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR-21h-18h-15h-12h-9h-6h-3h-24hNOW1008.21002.91004.1
Pressure climbing out of the rain band — clearing edging in.
Santa Rosa, CA
Air quality
26
AQI
Good
→-1 in 6h

AQI 26 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points).

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

PM 2.5DRIVERGood
4.4μg/m³
PM 10Good
5μg/m³
NO₂Good
4μg/m³
OzoneGood
31μg/m³
UV IndexLow
0.9

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
Santa Rosa, CA
Sky cover · visibility · 24h
Cloud cover
65%
PARTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
32.0mi
UNLIMITED
134 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
15:00 UTC · Santa Rosa, 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
15:00 UTC · Santa Rosa, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Santa Rosa, CA
Satellite · infrared · animated
Santa Rosa, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Santa Rosa, CA
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:45 AM
Sunrise
11:14 PM
Daylight
14h 05m
Sunset
1:19 PM
Civil dusk
8:51 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Santa Rosa, CA
The moon
Waning Gibbous
84% illuminated
Moonrise
9:56 PM
Moonset
10:21 AM
In sign
♓︎ Pisces
Santa Rosa, CA
Microseason
Aug 1–5

August begins in scorching stillness

plant
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Santa Rosa at a glance

  • Today vs. normal: 5°F below the seasonal normal for this latitude
  • Last frost: April 7 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 95401, 95403, 95404, 95405, 95407, 95409

16-Day Forecast — Santa Rosa

  1. Sun98°52°0%
  2. Mon96°60°0%
  3. Tue96°58°0%
  4. Wed93°61°0%
  5. Thu92°60°0%
  6. Fri95°62°0%
  7. Sat103°63°0%
  8. Sun93°61°0%
  9. Mon92°58°0%
  10. Tue86°57°0%
  11. Wed84°58°1%
  12. Thu91°59°3%
  13. Fri90°60°3%
  14. Sat84°59°0%
  15. Sun89°58°3%
  16. Mon95°61°0%

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

Live wind & temperature near Santa Rosa

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 Santa Rosa

Santa Rosa sits in Sonoma County, where the year’s longest day runs 14h 51m of daylight and its shortest just 9h 29m — a swing of +5h 22m 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 383 miles to the SE. The nearest town Santa Rosa tracks is Vallejo, roughly 34 miles to the SE.

Air quality in Santa Rosa’s county has trended cleaner since 2020; its cleanest year on record was 2025 (median AQI 9). See the full air-quality history for Santa Rosa.

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——
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

In Santa Rosa, July runs warmest near 73°F and December coldest around 48°F, while February is the wettest month (5.6 inches) and August the driest (0.0 inches).

MonthMean tempPrecipRainy days
January48°5.6″15
February50°5.6″13
March52°4.1″14
April57°2.3″10
May63°0.8″6
June68°0.1″1
July73°0.0″0
August73°0.0″0
September69°0.2″2
October63°1.0″4
November53°3.6″10
December48°5.3″13

Regional context

Per NOAA NCEI 1991-2020 normals, Santa Rosa runs from a 48°F January mean to 73°F in July, a 25°F seasonal spread, with near 28.5 inches of precipitation across about 88 wet days.

Cool-season fronts carry Santa Rosa's rain: February logs 5.6 inches on 12.8 days, against August's 0.0 inches on 0.4 — winter does the heavy lifting in Santa Rosa. It is a winter-storm rhythm Santa Rosa shares with places like Fulton, CA, Larkfield-Wikiup, CA and Rohnert Park, CA.

Hard freezes are rare in Santa Rosa: the coldest month averages 48°F, so Santa Rosa's growing window runs most of the year. July is the hottest stretch near 73°F, pushing cool-season crops to the milder shoulder months. Within Santa Rosa, low or inland lots lose 3-5°F overnight versus Santa Rosa's coastal ground.

Similar climates: Fulton, CA, Larkfield-Wikiup, CA, Rohnert Park, CA, Sebastopol, CA, Sonoma State University, CA.

Naturalist notes

Oak trees complete their leaf emergence by late May, creating full canopies across the local hillsides.

Western bluebirds begin their second nesting cycle in June, taking advantage of the abundant insect activity.

Frequently asked

When does it freeze in Santa Rosa?
Santa Rosa's last spring frost lands near mid-April, and in Santa Rosa the first fall frost follows around mid-November.
What is the rainy season in Santa Rosa?
Santa Rosa sees its heaviest rain in February (around 5.6 inches), part of roughly 29 inches a year.
What is the warmest month in Santa Rosa?
July is Santa Rosa's warmest month, averaging about 73°F.
What is the coldest month in Santa Rosa?
Santa Rosa bottoms out in December, with a mean near 48°F.
When can I start a vegetable garden in Santa Rosa?
Santa Rosa's last frost (mid-April) cues hardy greens; in Santa Rosa, hold heat-lovers two weeks past.
How many rainy days does Santa Rosa get?
Santa Rosa records around 88 days of measurable precipitation annually.
What hardiness zone is Santa Rosa?
Santa Rosa sits in the USDA zone set by December lows near 48°F; the USDA ZIP tool gives the band.
What is the 10-day forecast for Santa Rosa?
Santa Rosa'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 Santa Rosa?
See this week's day-by-day rain chances for Santa Rosa in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Santa Rosa?
Current conditions for Santa Rosa and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Santa Rosa forecast updated?
The Santa Rosa forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Santa Rosa?
Today's sunrise and sunset times for Santa Rosa 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 Santa Rosa?
The next few days in Santa Rosa's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Santa Rosa, California occupies a hot-summer Mediterranean zone, with January means near 48°F and July around 73°F — a 25°F swing.

Rain and snow bring Santa Rosa roughly 29 inches a year across approximately 88 measurable-precipitation days.

The 25°F gap between Santa Rosa's summer and winter, at 38.4°N, shapes Santa Rosa's frost calendar.

All cities in California →

San Francisco, CA weather →

ZIP codes in Santa Rosa

  • 95409
  • 95403
  • 95401
  • 95407
  • 95405
  • 95404
  • 95406

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.