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

Boulder Hill, Illinois Weather

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

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

Boulder Hill, IL
Saturday, July 4 at 10:55 AM
77
°
Overcast
Feels like
84°
Humidity
80%
Wind
4 mph
Sunrise
12:24 AM
Sunset
3:31 PM
Boulder Hill, IL
Hour by hour · 24h
24-Hour ForecastBoulder Hill, IL: 24-hour forecast. Temperatures range from 65 to 81 degrees Fahrenheit with a 51% chance of precipitation at 7 PM.
L 65°H 81°
Boulder Hill, IL
7-day forecast
  1. Today
    Jul 4
    Showers
    83%
    0.50″
    81°69°—
  2. Sunday
    Jul 5
    Overcast
    17%
    —
    78°65°-3°
  3. Monday
    Jul 6
    Overcast
    —
    —
    81°63°+3°
  4. Tuesday
    Jul 7
    Overcast
    —
    —
    81°59°0°
  5. Wednesday
    Jul 8
    Overcast
    11%
    —
    81°61°0°
  6. Thursday
    Jul 9
    Thunderstorm
    52%
    0.18″
    78°65°-3°
  7. Friday
    Jul 10
    Overcast
    45%
    —
    82°62°+4°
Boulder Hill, IL
Next 24 hours · Mild now
62°73°84°6a12p6p12anow 77°high 81°low 65°PRECIP %
Boulder Hill, IL
Anemometer · 24h winds · from true
NESW
From · True
S
174° · backing 48°
Direction
S
174°
Sustained
4
mph
Gust
6
mph
Peak 24h
17
avg 5
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 5 · pk 17 @ 1:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 277SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Boulder Hill, IL
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
990.3
+0.3 mb in 3h · steady · 29.24 inHg
Now
990.3
mb
3h
+0.3
mb
12h
-0.5
mb
24h
-3.4
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 990–994
9859909951000STORM|RAIN-21h-18h-15h-12h-9h-6h-3h-24hNOW994.0990.3990.6
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Boulder Hill, IL
Air quality
30
AQI
Good
→-3 in 6h▲Peak ~39 @ 10 PM

AQI 30 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM scrubbed by 3 hours of recent rain — PM2.5 down to 6.8 µg/m³, PM10 to 7.4 µg/m³.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.

PM 2.5DRIVERGood
6.8μg/m³
PM 10Good
7μg/m³
NO₂Good
7μg/m³
OzoneModerate
66μg/m³
UV IndexLow
1.9

What's driving it

Ozone × UV × Sky

Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~83%) — afternoon ozone should stay flat.

Present
AQI 31
UV peak
2.7 at 1 PM
Sky at peak
overcast
Projected peak
AQI 6

PM × Wind × Precip

PM scrubbed by 3 hours of recent rain — PM2.5 down to 6.8 µg/m³, PM10 to 7.4 µg/m³.

PM2.5/PM10
0.92
Wind
calm
Recent rain
3h 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/m³300
Boulder Hill, IL
Sky cover · visibility · 24h
Cloud cover
80%
MOSTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
39.3mi
UNLIMITED
52 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
15:55 UTC · Boulder Hill, 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
15:55 UTC · Boulder Hill, IL · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Boulder Hill, IL
Satellite · infrared · animated
Boulder Hill, IL
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Boulder Hill, IL
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
4:51 AM
Sunrise
12:24 AM
Daylight
15h 07m
Sunset
3:31 PM
Civil dusk
9:06 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Boulder Hill, IL
The moon
Waning Gibbous
80% illuminated
Moonrise
10:50 PM
Moonset
9:57 AM
In sign
♓︎ Pisces
Boulder Hill, IL
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Boulder Hill at a glance

  • Today vs. normal: 7°F above the seasonal normal for this latitude
  • Last frost: April 26 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Boulder Hill

  1. Sat81°69°83%
  2. Sun78°65°17%
  3. Mon81°63°2%
  4. Tue81°59°1%
  5. Wed81°61°11%
  6. Thu78°65°52%
  7. Fri82°62°45%
  8. Sat81°62°16%
  9. Sun68°58°7%
  10. Mon74°56°7%
  11. Tue79°60°7%
  12. Wed79°62°26%
  13. Thu83°65°21%
  14. Fri82°69°29%
  15. Sat86°70°23%
  16. Sun83°70°31%

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 — Boulder Hill

SPC has placed Boulder Hill in the Marginal Risk category for severe thunderstorms today.

  • TODAYMRGLMarginal Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3NONENo severe risk

Isolated severe storms possible. Limited threat for hail or damaging wind.

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——
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 Boulder Hill, July runs warmest near 76°F and January coldest around 23°F, while May is the wettest month (4.3 inches) and January the driest (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

In Boulder Hill, NOAA NCEI 1991-2020 normals put January near 23°F and July near 76°F — a 53°F seasonal arc — with about 35.8 inches of precipitation over 170 rainy or snowy days.

Precipitation in Boulder Hill 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 summer-storm rhythm groups Boulder Hill with places like Montgomery, IL, Oswego, IL and Aurora, IL.

Around mid-April, Boulder Hill sheds its freezing nights — kale, peas, spinach, and parsnips go into Boulder Hill's beds. Tomatoes and peppers do best set out two weeks later in Boulder Hill, once nights clear the mid-40s°F. Frost returns to Boulder Hill near mid-November, ending the tender-crop season. A creek-bottom lot in Boulder Hill can lag Boulder Hill's last frost 7-10 days behind a south slope.

Similar climates: Montgomery, IL, Oswego, IL, Aurora, IL, North Aurora, IL, Prestbury, IL.

Frequently asked

When does it freeze in Boulder Hill?
Boulder Hill's last spring frost lands near mid-April, and in Boulder Hill the first fall frost follows around mid-November.
What is the rainy season in Boulder Hill?
Boulder Hill sees its heaviest rain in May (around 4.3 inches), part of roughly 36 inches a year.
What is the warmest month in Boulder Hill?
Boulder Hill peaks in July, when the mean runs near 76°F.
What is the coldest month in Boulder Hill?
January is Boulder Hill's coldest month, averaging about 23°F.
When can I start a vegetable garden in Boulder Hill?
Hardy spring crops go in near mid-April in Boulder Hill; tender peppers and squash wait 10–14 days.
How many rainy days does Boulder Hill get?
Expect roughly 170 wet days a year in Boulder Hill.
What hardiness zone is Boulder Hill?
With January around 23°F, Boulder Hill's zone reflects that minimum — the USDA ZIP map confirms Boulder Hill's band.
What is the 10-day forecast for Boulder Hill?
Boulder Hill'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 Boulder Hill?
See this week's day-by-day rain chances for Boulder Hill in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Boulder Hill?
Current conditions for Boulder Hill and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Boulder Hill forecast updated?
The Boulder Hill forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Boulder Hill?
Today's sunrise and sunset times for Boulder Hill 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 Boulder Hill?
The next few days in Boulder Hill's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

The warm-summer humid continental climate of Boulder Hill, Illinois carries typical Januarys near 23°F and Julys around 76°F — 53°F of seasonal travel.

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

Boulder Hill sits at 41.7°N; that 53°F seasonal swing frames planting windows and frost dates across Boulder Hill.

All cities in Illinois →

Aurora, IL weather →

ZIP codes in Boulder Hill

  • 60538

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.