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Fontana, California Weather

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

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

Fontana, CA
Sunday, July 5 at 10:53 AM
83
°
Clear
Feels like
86°
Humidity
38%
Wind
5 mph
Sunrise
10:43 PM
Sunset
1:04 PM
Fontana, CA
Hour by hour · 24h
24-Hour ForecastFontana, CA: 24-hour forecast. Temperatures range from 60 to 91 degrees Fahrenheit.
L 60°H 91°
Fontana, CA
7-day forecast
  1. Today
    Jul 5
    Partly Cloudy
    —
    —
    91°66°—
  2. Monday
    Jul 6
    Clear
    —
    —
    92°60°+1°
  3. Tuesday
    Jul 7
    Clear
    —
    —
    95°64°+3°
  4. Wednesday
    Jul 8
    Clear
    —
    —
    100°77°+5°
  5. Thursday
    Jul 9
    Clear
    —
    —
    100°80°0°
  6. Friday
    Jul 10
    Overcast
    —
    —
    98°78°-2°
  7. Saturday
    Jul 11
    Overcast
    —
    —
    93°79°-5°
Fontana, CA
Next 24 hours · Mild now
HOT 90°50°75°100°6a12p6p12anow 80°high 91°low 60°
Fontana, CA
Anemometer · 24h winds · from true
NESW
From · True
WSW
241° · backing 22°
Direction
WSW
241°
Sustained
5
mph
Gust
6
mph
Peak 24h
17
avg 6
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 6 · pk 17 @ 5:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 173SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Fontana, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
970.4
+0.4 mb in 3h · steady · 28.66 inHg
Now
970.4
mb
3h
+0.4
mb
12h
-0.9
mb
24h
-3.0
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 970–974
965970975980-21h-18h-15h-12h-9h-6h-3h-24hNOW973.7969.5970.4
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Fontana, CA
Air quality
50
AQI
Good
→-1 in 6h

AQI 50 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 14.9 µg/m³ (AQI 62) with a 0.80 fine-to-coarse ratio and 5 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 2.5DRIVERModerate
14.9μg/m³
PM 10Good
19μg/m³
NO₂Good
10μg/m³
OzoneModerate
70μg/m³
UV IndexVery high
7.3

What's driving it

Ozone × UV × Sky

Ozone at AQI 33 now. With UV 10 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 45 around 1 PM.

Present
AQI 33
UV peak
10.3 at 1 PM
Sky at peak
clear
Projected peak
AQI 45

PM × Wind × Precip

PM2.5 at 14.9 µg/m³ (AQI 62) with a 0.80 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.80
Wind
light
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/m³360
Fontana, CA
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
100.5mi
UNLIMITED
156 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
17:53 UTC · Fontana, 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
17:53 UTC · Fontana, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Fontana, CA
Satellite · infrared · animated
Fontana, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Fontana, CA
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:15 AM
Sunrise
10:43 PM
Daylight
14h 21m
Sunset
1:04 PM
Civil dusk
8:35 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Fontana, CA
The moon
Waning Gibbous
71% illuminated
Moonrise
11:06 PM
Moonset
11:08 AM
In sign
♓︎ Pisces
Fontana, 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 →

Fontana at a glance

  • Today vs. normal: 5°F above the seasonal normal for this latitude
  • Last frost: March 12 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP codes: 92335, 92336, 92337

16-Day Forecast — Fontana

  1. Sun91°66°1%
  2. Mon92°60°1%
  3. Tue95°64°0%
  4. Wed100°77°0%
  5. Thu100°80°0%
  6. Fri98°78°0%
  7. Sat93°79°1%
  8. Sun91°74°1%
  9. Mon102°80°6%
  10. Tue104°86°12%
  11. Wed101°85°7%
  12. Thu106°85°13%
  13. Fri105°87°14%
  14. Sat99°85°12%
  15. Sun104°86°19%
  16. Mon105°85°18%

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

Live wind & temperature near Fontana

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——
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

In Fontana, August runs warmest near 80°F and January coldest around 52°F, while February is the wettest month (3.4 inches) and August the driest (0.0 inches).

MonthMean tempPrecipRainy days
January52°3.3″11
February54°3.4″10
March57°3.0″13
April62°1.5″10
May67°0.5″7
June73°0.1″3
July79°0.1″1
August80°0.0″1
September76°0.1″2
October69°0.5″5
November59°1.6″8
December53°2.6″10

Regional context

Fontana's climate, from NOAA NCEI 1991-2020 station normals, pairs 52°F Januarys with 79°F Julys — a 27°F swing. About 16.7 inches of precipitation falls over roughly 82 days a year.

Fontana's moisture rides winter storm tracks: February brings 3.4 inches over 9.9 wet days, while August sees only 0.0 inches across 0.9 days in the dry warm season. That cool-season-wet pattern aligns Fontana with places like Bloomington, CA, Rialto, CA and Rancho Cucamonga, CA.

Fontana rarely sees a hard freeze — its coldest month sits near 52°F — so planting spans most of the calendar. Heat peaks in August around 80°F, which confines cool-season crops to the shoulders of summer. Across Fontana, elevation and tree cover drive a 4-7°F spread in Fontana's overnight lows.

Similar climates: Bloomington, CA, Rialto, CA, Rancho Cucamonga, CA, Jurupa Valley, CA, Muscoy, CA.

Naturalist notes

Late May brings the peak blooming period for California poppies across the region's hillsides and open spaces.

Western bluebirds typically begin their second nesting cycle during June in suitable oak woodland habitats.

Frequently asked

When does it freeze in Fontana?
Frost typically leaves Fontana by mid-March and returns to Fontana near mid-December.
What is the rainy season in Fontana?
Fontana sees its heaviest rain in February (around 3.4 inches), part of roughly 17 inches a year.
What is the warmest month in Fontana?
On average August tops the year in Fontana at about 80°F.
What is the coldest month in Fontana?
The coldest stretch in Fontana falls in January, around 52°F on average.
When can I start a vegetable garden in Fontana?
Hardy spring crops go in near mid-March in Fontana; tender peppers and squash wait 10–14 days.
How many rainy days does Fontana get?
Fontana averages about 82 days with measurable rain or snow each year.
What hardiness zone is Fontana?
With January around 52°F, Fontana's zone reflects that minimum — the USDA ZIP map confirms Fontana's band.
What is the 10-day forecast for Fontana?
Fontana'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 Fontana?
See this week's day-by-day rain chances for Fontana in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Fontana?
Current conditions for Fontana and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Fontana forecast updated?
The Fontana forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Fontana?
Today's sunrise and sunset times for Fontana 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 Fontana?
The next few days in Fontana's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In Fontana, California, the hot-summer Mediterranean climate runs from about 52°F in January to 79°F in July, a 27°F seasonal range.

Across the year, Fontana collects about 17 inches of precipitation over roughly 82 days with measurable rain or snow.

Fontana's 27°F range, set by its 34.1°N position, drives frost timing and what thrives in Fontana.

All cities in California →

Riverside, CA weather →

ZIP codes in Fontana

  • 92335
  • 92336
  • 92337
  • 92331
  • 92334
  • 92402

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.