Weather StoryAlmanac, microseasons, and the day's weather story.

Naperville, Illinois Weather

Night falls a minute earlier. Day 43 of summer. Read this microseason across nine climate regions →

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

Naperville, IL
Sunday, August 2 at 9:57 AM
69
°
Partly Cloudy
Feels like
70°
Humidity
88%
Wind
13 mph
Sunrise
12:48 AM
Sunset
3:09 PM
Naperville, IL
Hour by hour · 24h
24-Hour ForecastNaperville, IL: 24-hour forecast. Temperatures range from 62 to 77 degrees Fahrenheit.
L 62°H 77°
Naperville, IL
7-day forecast
  1. Today
    Aug 2
    Overcast
    —
    —
    77°66°—
  2. Monday
    Aug 3
    Mostly Clear
    —
    —
    82°62°+5°
  3. Tuesday
    Aug 4
    Overcast
    —
    —
    81°62°-1°
  4. Wednesday
    Aug 5
    Light Drizzle
    57%
    —
    82°64°+1°
  5. Thursday
    Aug 6
    Showers
    59%
    0.55″
    77°67°-5°
  6. Friday
    Aug 7
    Light Drizzle
    —
    —
    82°63°+5°
  7. Saturday
    Aug 8
    Light Drizzle
    15%
    —
    88°70°+6°
Naperville, IL
Next 24 hours · Mild now
58°69°80°12p6p12a6anow 69°high 77°low 62°
Naperville, IL
Anemometer · 24h winds · from true
NESW
From · True
N
011° · backing 40°
Direction
N
011°
Sustained
13
mph
Gust
26
mph
Peak 24h
33
avg 11 mph
Beaufort · 4 · MOD 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 11 mph · pk 33 mph @ 6:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 263SUSTGUST
−24h−18h−12h−6hnow
Sustained 13 mph with gusts pulsing to 26 — flags snap, branches bend.
Naperville, IL
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
986.8
+1.4 mb in 3h · rising · 29.14 inHg
Now
986.8
mb
3h
+1.4
mb
12h
+2.2
mb
24h
+4.4
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 982–987
975980985990-21h-18h-15h-12h-9h-6h-3h-24hNOW985.9981.5985.9
The low is filling — pressure climbing out of storm territory.
Naperville, IL
Air quality
66
AQI
Moderate
↑+5 in 6h

AQI 66 (Moderate), driven by PM2.5. AQI up 5 over the last 6 hours (gradual rise). PM2.5 at 15.1 µg/m³, PM10 at 15.6 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 2.5DRIVERModerate
15.1μg/m³
PM 10Good
16μg/m³
NO₂Good
4μg/m³
OzoneModerate
85μg/m³
UV IndexLow
1.6

What's driving it

Ozone × UV × Sky

Ozone at AQI 40 now. With UV 3.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 12.

Present
AQI 40
UV peak
3.2 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 12

PM × Wind × Precip

PM2.5 at 15.1 µg/m³, PM10 at 15.6 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.97
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/m³420
Naperville, IL
Sky cover · visibility · 24h
Cloud cover
65%
PARTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
30.6mi
UNLIMITED
32 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
14:57 UTC · Naperville, IL · 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
14:57 UTC · Naperville, IL · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Naperville, IL
Satellite · infrared · animated
Naperville, IL
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Naperville, IL
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:17 AM
Sunrise
12:48 AM
Daylight
14h 21m
Sunset
3:09 PM
Civil dusk
8:42 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Naperville, IL
The moon
Waning Gibbous
84% illuminated
Moonrise
9:37 PM
Moonset
9:58 AM
In sign
♓︎ Pisces
Naperville, IL
Microseason
Aug 1–5

Night falls a minute earlier

celestial
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Naperville at a glance

  • Today vs. normal: 8°F above the seasonal normal for this latitude
  • Last frost: April 26 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 60540, 60563, 60564, 60565

16-Day Forecast — Naperville

  1. Sun77°66°2%
  2. Mon82°62°0%
  3. Tue81°62°1%
  4. Wed82°64°57%
  5. Thu77°67°59%
  6. Fri82°63°9%
  7. Sat88°70°15%
  8. Sun90°72°24%
  9. Mon77°68°24%
  10. Tue82°67°31%
  11. Wed87°72°25%
  12. Thu89°70°31%
  13. Fri91°72°26%
  14. Sat84°70°26%
  15. Sun84°66°27%
  16. Mon82°68°26%

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

Live wind & temperature near Naperville

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 Naperville

Naperville sits in DuPage County, where the year’s longest day runs 15h 13m of daylight and its shortest just 9h 8m — a swing of +6h 4m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Chicago, the state’s largest city, lies about 25 miles to the ENE. The nearest town Naperville tracks is Aurora, roughly 6 miles to the W.

Air quality in Naperville’s county has held roughly steady since 2020; its cleanest year on record was 2025 (median AQI 42). See the full air-quality history for Naperville.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱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

Night falls a minute earlier

Sunset retreats perceptibly — daylight shortening speeds up.

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

Naperville peaks at about 76°F in July and bottoms near 23°F in January; May brings the heaviest rain (4.3 inches) and January the least (1.7 inches).

MonthMean tempPrecipRainy days
January23°1.7″14
February26°1.9″13
March37°2.9″15
April50°3.8″17
May59°4.3″18
June70°4.0″15
July76°2.9″14
August75°3.1″14
September67°3.1″13
October55°2.9″11
November40°3.0″12
December27°2.2″13

Regional context

Per NOAA NCEI 1991-2020 normals, Naperville runs from a 23°F January mean to 76°F in July, a 53°F seasonal spread, with near 35.8 inches of precipitation across about 170 wet days.

Precipitation in Naperville runs summer-dominant: May averages 4.3 inches across 17.9 days of warm-season storms, while January drops to 1.7 inches over 14.3 rainy days of drier cool air. That puts Naperville in a summer-convective cohort with places like Lisle, IL, Warrenville, IL and Bolingbrook, IL.

Around mid-April, Naperville sheds its freezing nights — kale, peas, spinach, and parsnips go into Naperville's beds. Heat-demanding starts go out a fortnight on in Naperville, after the soil warms and cold snaps clear. The season ends by mid-November in Naperville, once hard frosts set back in. Naperville's low ground holds frost later into spring than Naperville's benches, which run 3-5 days ahead.

Similar climates: Lisle, IL, Warrenville, IL, Bolingbrook, IL, Woodridge, IL, Aurora, IL.

Naturalist notes

Red-winged blackbirds return to Naperville's wetlands and marshes in early March, their distinctive calls marking winter's retreat.

Common lilacs typically begin blooming in mid to late May, filling neighborhoods with their characteristic purple clusters and sweet fragrance.

Frequently asked

When does it freeze in Naperville?
Naperville's last spring frost lands near mid-April, and in Naperville the first fall frost follows around mid-November.
What is the rainy season in Naperville?
Naperville sees its heaviest rain in May (around 4.3 inches), part of roughly 36 inches a year.
What is the warmest month in Naperville?
Naperville peaks in July, when the mean runs near 76°F.
What is the coldest month in Naperville?
January is Naperville's coldest month, averaging about 23°F.
When can I start a vegetable garden in Naperville?
Around mid-April, start frost-hardy crops in Naperville; tomatoes and basil belong a fortnight later.
How many rainy days does Naperville get?
Naperville records around 170 days of measurable precipitation annually.
What hardiness zone is Naperville?
Since January in Naperville averages 23°F, Naperville's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Naperville?
Naperville'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 Naperville?
See this week's day-by-day rain chances for Naperville in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Naperville?
Current conditions for Naperville and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Naperville forecast updated?
The Naperville forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Naperville?
Today's sunrise and sunset times for Naperville 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 Naperville?
The next few days in Naperville's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In Naperville, Illinois, the warm-summer humid continental climate runs from about 23°F in January to 76°F in July, a 53°F seasonal range.

In a typical year Naperville records about 36 inches of precipitation on around 170 days.

From 41.7°N, Naperville sees a 53°F seasonal swing that governs Naperville's planting and frost windows.

All cities in Illinois →

Chicago, IL weather →

ZIP codes in Naperville

  • 60540
  • 60563
  • 60564
  • 60565
  • 60567

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.