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Old Mill Creek, Illinois Weather

Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →

Old Mill Creek weather forecast — hour by hour, 7-day outlook, NOAA radar

Old Mill Creek, IL
Saturday, July 4 at 1:45 PM
80
°
Mostly Clear
Feels like
87°
Humidity
77%
Wind
8 mph
Sunrise
12:20 AM
Sunset
3:32 PM
Old Mill Creek, IL
Hour by hour · 24h
24-Hour ForecastOld Mill Creek, IL: 24-hour forecast. Temperatures range from 64 to 82 degrees Fahrenheit with a 41% chance of precipitation at 5 PM.
L 64°H 82°
Old Mill Creek, IL
7-day forecast
  1. Today
    Jul 4
    Rain
    61%
    0.24″
    82°68°—
  2. Sunday
    Jul 5
    Overcast
    —
    —
    79°64°-3°
  3. Monday
    Jul 6
    Overcast
    —
    —
    76°61°-3°
  4. Tuesday
    Jul 7
    Overcast
    —
    —
    80°57°+4°
  5. Wednesday
    Jul 8
    Light Drizzle
    15%
    —
    82°61°+2°
  6. Thursday
    Jul 9
    Showers
    50%
    —
    79°63°-3°
  7. Friday
    Jul 10
    Light Drizzle
    43%
    —
    77°60°-2°
Old Mill Creek, IL
Next 24 hours · Warm now
60°73°86°12p6p12a6anow 82°high 82°low 64°PRECIP %
Old Mill Creek, IL
Anemometer · 24h winds · from true
NESW
From · True
ESE
111° · backing 117°
Direction
ESE
111°
Sustained
8
mph
Gust
9
mph
Peak 24h
20
avg 6
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 6 · pk 20 @ 3:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 1810SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 117° from the ese.
Old Mill Creek, IL
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
990.0
+0.7 mb in 3h · rising · 29.23 inHg
Now
990.0
mb
3h
+0.7
mb
12h
+1.2
mb
24h
+0.1
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 989–991
9809859909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW990.5988.9990.1
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Old Mill Creek, IL
Air quality
39
AQI
Good
→0 in 6h▲Peak ~49 @ 11 PM

AQI 39 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM scrubbed by 2 hours of recent rain — PM2.5 down to 12.3 µg/m³, PM10 to 13.6 µg/m³.

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

PM 2.5DRIVERModerate
12.3μg/m³
PM 10Good
14μg/m³
NO₂Good
8μg/m³
OzoneUnhealthy SG
107μg/m³
UV IndexHigh
6.4

What's driving it

Ozone × UV × Sky

Ozone at AQI 50 now. With UV 6.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 30 around 1 PM.

Present
AQI 50
UV peak
6.4 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 30

PM × Wind × Precip

PM scrubbed by 2 hours of recent rain — PM2.5 down to 12.3 µg/m³, PM10 to 13.6 µg/m³.

PM2.5/PM10
0.90
Wind
light
Recent rain
2h in last 6h
Pattern
washed out

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 TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³330
Old Mill Creek, IL
Sky cover · visibility · 24h
Cloud cover
40%
MOSTLY CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
38.9mi
UNLIMITED
47 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
18:45 UTC · Old Mill Creek, 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
18:45 UTC · Old Mill Creek, IL · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Old Mill Creek, IL
Satellite · infrared · animated
Old Mill Creek, IL
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Old Mill Creek, IL
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
4:46 AM
Sunrise
12:20 AM
Daylight
15h 12m
Sunset
3:32 PM
Civil dusk
9:07 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Old Mill Creek, IL
The moon
Waning Gibbous
79% illuminated
Moonrise
10:50 PM
Moonset
9:55 AM
In sign
♓︎ Pisces
Old Mill Creek, IL
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Old Mill Creek at a glance

  • Today vs. normal: 11°F above the seasonal normal for this latitude
  • Last frost: May 1 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Old Mill Creek

  1. Sat82°68°61%
  2. Sun79°64°9%
  3. Mon76°61°2%
  4. Tue80°57°1%
  5. Wed82°61°15%
  6. Thu79°63°50%
  7. Fri77°60°43%
  8. Sat75°56°9%
  9. Sun76°55°8%
  10. Mon72°54°9%
  11. Tue80°56°9%
  12. Wed78°62°33%
  13. Thu82°62°24%
  14. Fri75°70°21%
  15. Sat78°60°26%
  16. Sun72°58°32%

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

Right now in the garden

Peak growing season

As of July 4, 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.

SPC Convective Outlook

Storm Prediction Center — Old Mill Creek

SPC includes Old Mill Creek in the general thunderstorm area today — no severe risk, but storms are possible.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3NONENo severe risk

Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

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 · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 185 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——
April——
Maylettuce, peas, spinach, radisheslettuce, peas, radishes
Junelettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
Augusttomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
October—winter squash, tomatoes (last)
November——
December——

A year in weather

Old Mill Creek's warmest month is July (~75°F mean) and its coldest is January (~22°F). Rainfall peaks in May (3.7 inches) and bottoms out in January (1.8 inches).

MonthMean tempPrecipRainy days
January22°1.8″15
February24°1.9″13
March35°2.7″15
April47°3.4″17
May57°3.7″18
June68°3.4″15
July75°2.5″13
August74°2.8″13
September67°3.1″14
October54°2.9″13
November39°3.2″14
December26°2.3″13

Frequently asked

When does it freeze in Old Mill Creek?
In Old Mill Creek, expect the last spring frost near mid-May; Old Mill Creek's first autumn frost comes around mid-October.
What is the rainy season in Old Mill Creek?
May is the wettest month in Old Mill Creek, about 3.7 inches on average; the year totals roughly 34 inches.
What is the warmest month in Old Mill Creek?
The warmest stretch in Old Mill Creek comes in July, around 75°F on average.
What is the coldest month in Old Mill Creek?
On average January is the chilliest month in Old Mill Creek, about 22°F.
When can I start a vegetable garden in Old Mill Creek?
Time tomatoes in Old Mill Creek for two weeks after mid-May; peas and greens start at Old Mill Creek's frost line.
How many rainy days does Old Mill Creek get?
Expect roughly 173 wet days a year in Old Mill Creek.
What hardiness zone is Old Mill Creek?
Old Mill Creek sits in the USDA zone set by January lows near 22°F; the USDA ZIP tool gives the band.
What is the 10-day forecast for Old Mill Creek?
Old Mill Creek'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 Old Mill Creek?
See this week's day-by-day rain chances for Old Mill Creek in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Old Mill Creek?
Current conditions for Old Mill Creek and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Old Mill Creek forecast updated?
The Old Mill Creek forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Old Mill Creek?
Today's sunrise and sunset times for Old Mill Creek 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 Old Mill Creek?
The next few days in Old Mill Creek's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Old Mill Creek, Illinois has a warm-summer humid continental climate: January averages roughly 22°F, July about 75°F, 53°F between them.

Across the year, Old Mill Creek collects about 34 inches of precipitation over roughly 173 days with measurable rain or snow.

At 42.4°N, Old Mill Creek's 53°F summer-to-winter swing sets when Old Mill Creek's gardens wake and when frost returns.

All cities in Illinois →

Round Lake Beach, IL weather →

ZIP codes in Old Mill Creek

  • 60083

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.