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San Jose, California Weather

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

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

San Jose, CA
Sunday, July 5 at 11:04 AM
72
°
Clear
Feels like
77°
Humidity
64%
Wind
2 mph
Sunrise
10:52 PM
Sunset
1:31 PM
San Jose, CA
Hour by hour · 24h
24-Hour ForecastSan Jose, CA: 24-hour forecast. Temperatures range from 56 to 79 degrees Fahrenheit.
L 56°H 79°
San Jose, CA
7-day forecast
  1. Today
    Jul 5
    Overcast
    —
    —
    79°57°—
  2. Monday
    Jul 6
    Overcast
    —
    —
    76°56°-3°
  3. Tuesday
    Jul 7
    Overcast
    —
    —
    85°55°+9°
  4. Wednesday
    Jul 8
    Clear
    —
    —
    91°54°+6°
  5. Thursday
    Jul 9
    Clear
    —
    —
    92°59°+1°
  6. Friday
    Jul 10
    Overcast
    —
    —
    94°60°+2°
  7. Saturday
    Jul 11
    Overcast
    —
    —
    99°66°+5°
San Jose, CA
Next 24 hours · Mild now
50°68°85°6a12p6p12anow 72°high 79°low 56°
San Jose, CA
Anemometer · 24h winds · from true
NESW
From · True
NE
056° · veering 49°
Direction
NE
056°
Sustained
2
mph
Gust
6
mph
Peak 24h
13
avg 5
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 5 · pk 13 @ 3:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 132SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 49° from the ne.
San Jose, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1010.6
+0.7 mb in 3h · rising · 29.84 inHg
Now
1010.6
mb
3h
+0.7
mb
12h
+0.2
mb
24h
0.0
mb
Regime · CHANGE
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1009–1011
1000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR-21h-18h-15h-12h-9h-6h-3h-24hNOW1010.61008.91010.6
−24h−18h−12h−6hnow
Air sits at the threshold — small shifts decide the day.
San Jose, CA
Air quality
32
AQI
Good
→-1 in 6h

AQI 32 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.6 µg/m³ (AQI 48) with a 0.68 fine-to-coarse ratio and 2 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
8.6μg/m³
PM 10Good
13μg/m³
NO₂Good
2μg/m³
OzoneModerate
68μg/m³
UV IndexVery high
7.4

What's driving it

Ozone × UV × Sky

Ozone at AQI 32 now. With UV 8.5 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 36 around 1 PM.

Present
AQI 32
UV peak
8.5 at 1 PM
Sky at peak
clear
Projected peak
AQI 36

PM × Wind × Precip

PM2.5 at 8.6 µg/m³ (AQI 48) with a 0.68 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.68
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/m³300
San Jose, CA
Sky cover · visibility · 24h
Cloud cover
4%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
54.0mi
UNLIMITED
109 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
18:04 UTC · San Jose, 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
18:04 UTC · San Jose, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
San Jose, CA
Satellite · infrared · animated
San Jose, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
San Jose, CA
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:22 AM
Sunrise
10:52 PM
Daylight
14h 39m
Sunset
1:31 PM
Civil dusk
9:03 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
San Jose, CA
The moon
Waning Gibbous
70% illuminated
Moonrise
11:26 PM
Moonset
11:26 AM
In sign
♓︎ Pisces
San Jose, 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 →

San Jose at a glance

  • Today vs. normal: 72°F — typical for the season
  • Last frost: March 31 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP codes: 95110, 95111, 95112, 95113, 95116, 95117, 95118, 95119 +20 more

16-Day Forecast — San Jose

  1. Sun79°57°0%
  2. Mon76°56°0%
  3. Tue85°55°0%
  4. Wed91°54°0%
  5. Thu92°59°0%
  6. Fri94°60°0%
  7. Sat99°66°1%
  8. Sun88°69°1%
  9. Mon96°68°3%
  10. Tue98°67°2%
  11. Wed98°66°1%
  12. Thu99°65°3%
  13. Fri102°71°0%
  14. Sat97°69°0%
  15. Sun94°67°3%
  16. Mon93°62°3%

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

Live wind & temperature near San Jose

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

San Jose's warmest month is August (~73°F mean) and its coldest is January (~51°F). Rainfall peaks in January (4.2 inches) and bottoms out in July (0.0 inches).

MonthMean tempPrecipRainy days
January51°4.2″14
February53°3.8″12
March55°3.4″14
April59°1.7″10
May64°0.6″7
June69°0.1″5
July73°0.0″3
August73°0.1″3
September72°0.1″3
October67°0.7″5
November58°2.5″10
December51°3.6″13

Regional context

Drawing on NOAA NCEI 1991-2020 normals, San Jose's January averages 51°F and July 73°F — 22°F apart — while precipitation totals roughly 20.8 inches over some 98 days.

Cool-season fronts carry San Jose's rain: January logs 4.2 inches on 13.8 days, against July's 0.0 inches on 2.6 — winter does the heavy lifting in San Jose. It is a winter-storm rhythm San Jose shares with places like Fruitdale, CA, Alum Rock, CA and Cambrian Park, CA.

San Jose rarely sees a hard freeze — its coldest month sits near 51°F — so planting spans most of the calendar. Heat peaks in August around 73°F, which confines cool-season crops to the shoulders of summer. Within San Jose, low or inland lots lose 3-5°F overnight versus San Jose's coastal ground.

Similar climates: Fruitdale, CA, Alum Rock, CA, Cambrian Park, CA, East Foothills, CA, Campbell, CA.

Naturalist notes

Coast live oaks begin dropping their acorns in late October, carpeting sidewalks and parks throughout San Jose.

Anna's hummingbirds start their breeding season in December, with males performing dramatic dive displays above residential gardens.

Frequently asked

When does it freeze in San Jose?
San Jose's last spring frost lands near mid-April, and in San Jose the first fall frost follows around mid-November.
What is the rainy season in San Jose?
San Jose sees its heaviest rain in January (around 4.2 inches), part of roughly 21 inches a year.
What is the warmest month in San Jose?
On average August tops the year in San Jose at about 73°F.
What is the coldest month in San Jose?
The coldest stretch in San Jose falls in January, around 51°F on average.
When can I start a vegetable garden in San Jose?
Around mid-April, start frost-hardy crops in San Jose; tomatoes and basil belong a fortnight later.
How many rainy days does San Jose get?
Expect roughly 98 wet days a year in San Jose.
What hardiness zone is San Jose?
With January around 51°F, San Jose's zone reflects that minimum — the USDA ZIP map confirms San Jose's band.
What is the 10-day forecast for San Jose?
San Jose'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 San Jose?
See this week's day-by-day rain chances for San Jose in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in San Jose?
Current conditions for San Jose and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the San Jose forecast updated?
The San Jose forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in San Jose?
Today's sunrise and sunset times for San Jose 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 San Jose?
The next few days in San Jose's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

The hot-summer Mediterranean climate of San Jose, California carries typical Januarys near 51°F and Julys around 73°F — 22°F of seasonal travel.

In a typical year San Jose records about 21 inches of precipitation on around 98 days.

From 37.3°N, San Jose sees a 22°F seasonal swing that governs San Jose's planting and frost windows.

All cities in California →

Los Angeles, CA weather →

ZIP codes in San Jose

  • 95119
  • 95118
  • 95128
  • 95124
  • 95125
  • 95122
  • 95008
  • 95002
  • 95117
  • 95116
  • 95111
  • 95110
  • 95113
  • 95112
  • 95126
  • 95127
  • 95120
  • 95123
  • 95148
  • 95133
  • 95132
  • 95131
  • 95130
  • 95136
  • 95134
  • 95139
  • 95138
  • 95037
  • 95013
  • 95129
  • 95121
  • 95101
  • 95103
  • 95106
  • 95109
  • 95115
  • 95141
  • 95150
  • 95151
  • 95153
  • 95154
  • 95155
  • 95156
  • 95157
  • 95158
  • 95159
  • 95160
  • 95161
  • 95164
  • 95172
  • 95173
  • 95190
  • 95191
  • 95192
  • 95193
  • 95194
  • 95196

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.