Kishwaukee Valley RdIMC02
Beside a road/5.3 mi away/817 ft/8 ft below here
temp, pavement temp, wind, visibility, precip
Marengo, Illinois
City in McHenry County, Illinois* WHAT...Sub-freezing temperatures are expected. * WHERE...De Kalb, Lee, Kane, and McHenry Counties. * WHEN...From 5 AM to 8 AM CDT Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Take steps now to protect tender plants from the cold.
50°
55°/45°
Overcast·
Feels like 50°·Moderate breeze 15 mph WNW
Alert. A Freeze Warning is in force for Marengo until 8 AM tomorrow. Read the alert in full, and see what it means in the Field Book.
Now. Marengo is 50° and overcast at 3 AM. The dew point is 46°, so the air feels dry and comfortable. Moderate breeze from the west-northwest at 15 mph, gusting to 26 mph.
Today and tonight. It warms to about 53° by 12 PM. Tonight falls to about 32° by 7 AM, under a mostly clear sky. A freeze: protect plants and pipes. No rain is expected for the rest of the day.
The week. The warmest day ahead is Thursday, near 72°, and the coolest tomorrow, near 56°. The days ahead look dry. The first freeze could come tomorrow, a low of 32°.
The sky tonight. The sun sets at 6:11 PM. The Moon is a waxing crescent, 33% lit, and sets at 10 PM. The next full Moon is Sunday, Oct 25. After dark, look for Saturn, bright in the east-southeast. A planet shines with a steady light where the stars around it twinkle. The Orionids meteor shower is active, peaking around Oct 21: at its peak, up to about 20 meteors an hour can be seen from a dark site. The sky is forecast to stay clear: a good night to look up. The day is 11 hours 4 minutes long, 3 minutes shorter than yesterday.
0UV Low
12Air quality
83%Humidity
96%Cloud
Now
3:00 AM
50feels50
15mph
Today
Oct 16
5545
17%
20mph
Sat
Oct 17
5632
clear day
Sun
Oct 18
6237
14mph
Mon
Oct 19
6740
overcast
Tue
Oct 20
6942
overcast
Wed
Oct 21
7145
overcast
Thu
Oct 22
7249
12%
50°
55°45°
56°32°
62°37°
67°40°
69°42°
71°45°
72°49°
As of 3:00 AM in Marengo, Illinois.
Air quality
The air at Marengo
Index 12, good, led by ozone. Read at 2 AM from its reporting area, North and West Suburbs (Chicago) (IL), 19 miles off.
12Good
- Fine particles (PM2.5)7Good-
- Ozone12Good-
- Coarse particles (PM10)5Good-
The days ahead
Good each day through Mon Oct 19, led by fine particles. Yesterday measured 32, good.
GoodModerate
- 32YesterdayOct 15
- GoodTodayOct 16
- GoodSatOct 17
- GoodSunOct 18
- GoodMonOct 19
Smoke, the next 41 hours
No smoke near the ground through Sat 7 PM.
Precipitation
What has fallen at Marengo
0.66 in in the last 24 hours, 0.81 in over the last 3 days, to Fri 1 AM. Measured by radar and rain gauges, as water.
- Last 24 hours
- 0.66in
- Last 3 days
- 0.81in
3 days agoLast 24 hours 81%
Visibility
How far you can see at Marengo, the next 41 hours
Visibility stays 8 miles or more through Sat 7 PM, lowest 9 miles Sat 8 AM.
F
Now, today, and the week
On the radar over Marengo, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture
Weather instrument stations by state
What is measuring near here
The 7 instruments nearest Marengo, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.
measured now5 instruments
Rank1,084of 1,393
44N7E-17.8h1 (WOOD-08-01)421747088270701
At a river or reservoir gauge/8.5 mi away/943 ft/118 ft above here
temp, wind, gust, humidity, pressure
Citizen station DW9568DW9568
In a volunteer observer's own ground/11.2 mi away/811 ft/14 ft below here
temp, humidity, wind, precip, pressure
De KalbDKB
At an airfield/22.4 mi away/915 ft/90 ft above here
temp, wind, gust, visibility, precip, pressure
Shabbona 5 NNE54811
At a climate reference station/30.9 mi away/861 ft/36 ft above here
temp, humidity, wind, solar, precip
measured daily2 instruments
Marengo 0.7 NNEIL-MCH-87
In a volunteer observer's own ground/0.7 mi away/811 ft/14 ft below here
precip, snowfall, snow depth
Woodstock 5NWWODI2
At a cooperative observer's station/8.7 mi away/945 ft/120 ft above here
snowfall, snow depth, precip, high, low
Station report
The weather at De Kalb, drawn
The nearest airport reporting now, 22.4 mi from Marengo, Illinois. From its report of Oct 16, 2026, 2:15 AM local time: 3 of its 6 sheets.
The sky
Overcast at 1,700 ft; the ceiling is 1,700 ft; visibility 10 mi or more.
The air
51.0 F with a dew point of 47.7 F, 88 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 1,700 ft.
The wind
From the west northwest (300 degrees) at 21 mph, gusting 31 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 31 mph.
The full report of De Kalb, in 6 sheets, each beside the Field Book plates that explain it
What the snow tracker reads here
Every instrument in this state
-
Snow on the ground
Elsewhere in Illinois
23 places, each with its own forecast and its own instruments.
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Near Marengo
The nearest places, each with its own forecast and the instruments nearest it.