Weather forecast for todayCrystal Lake, IL

Weather forecast for today

Current condition 5:23 am CDT

  • 46°F
  • Feels like:
    46°F
Partly Cloudy
Partly Cloudy
  • Precipitation: 0"
  • Wind: 1mphNNE 20°
  • Humidity: 72%
  • Dewpoint: 39°F
  • Pressure: 30.29"Hg
  • Visibility: 3mi
  • UV index: 0
  • ▼
Currently, in Crystal Lake, the sky is covered by scattered clouds with bright spots in between.
The temperature is a brisk 46.4°F. The current temperature is almost at the minimum-expected 44.6°F for today.

Wednesday Oct 21, 2026

  • 72°F
  • 45°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 4mphSW 219°
  • Humidity: 56%
  • UV index: 4
  • Sunrise: 7:13 am CDT
  • Sunset: 6:02 pm CDT
  • ▼
On Wednesday, October 21, thin clouds will pass through at times, but overall, it will remain bright.
Dramatic temperature shifts from a high of a pleasant 71.6°F to a low of a frosty 44.6°F are anticipated.
The expected high of 71.6°F appears seasonally off, better matching September's typical values.
Sunrise will be at 7:13 am and sunset at 6:02 pm; the daylight will last for 10h and 49min.

Hourly overview

Hourly temperatures

Warmest hour: 2 pm 72°C.
Coldest hour: 6 am 46°C.

Chance of precipitation

Highest chance: 12 am 6%.

Hourly weather forecast

  • 6 am
  • 46°F
  • Feels like:
    46°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphS 185°
  • Humidity: 74%
  • Pressure: 30.27"Hg
  • Visibility: 1mi
  • UV index: 0
  • ▼
Sunrise: 7:13 am
  • 8 am
  • 48°F
  • Feels like:
    48°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphSSW 203°
  • Humidity: 76%
  • Pressure: 30.27"Hg
  • Visibility: 4mi
  • UV index: 0
  • ▼
  • 10 am
  • 57°F
  • Feels like:
    57°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 3mphSSW 211°
  • Humidity: 63%
  • Pressure: 30.27"Hg
  • Visibility: 10mi
  • UV index: 2
  • ▼
  • 12 pm
  • 66°F
  • Feels like:
    66°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 4mphSW 221°
  • Humidity: 44%
  • Pressure: 30.24"Hg
  • Visibility: 10mi
  • UV index: 3
  • ▼
  • 2 pm
  • 72°F
  • Feels like:
    72°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 4mphSW 232°
  • Humidity: 39%
  • Pressure: 30.21"Hg
  • Visibility: 10mi
  • UV index: 3
  • ▼
  • 4 pm
  • 70°F
  • Feels like:
    70°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 4mphSW 234°
  • Humidity: 40%
  • Pressure: 30.18"Hg
  • Visibility: 10mi
  • UV index: 1
  • ▼
  • 6 pm
  • 63°F
  • Feels like:
    63°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 2mphSW 228°
  • Humidity: 55%
  • Pressure: 30.18"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunset: 6:02 pm
  • 8 pm
  • 57°F
  • Feels like:
    57°F
Clear
Clear
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 1mphWSW 238°
  • Humidity: 70%
  • Pressure: 30.21"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 pm
  • 52°F
  • Feels like:
    52°F
Clear
Clear
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 1mphW 262°
  • Humidity: 80%
  • Pressure: 30.21"Hg
  • Visibility: 9mi
  • UV index: 0
  • ▼
Today, in Crystal Lake, primarily clear and occasionally cloudy weather is anticipated.
The temperature will vary between the lowest temperature of 46.4°F and the highest temperature of 71.6°F. The warmest part of the day will be at 2 pm and 3 pm.
The day’s peak temperature will reflect September's norm of 72.5°F more than October's 59°F. The night temperature will be comparable to the standard October low of 43.9°F.
Updated: Oct 21, 2026 @ 10:23:20 UTC
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

The current temperature (5:23 am CDT) is 46.4°F.

Today, high-altitude clouds may scatter across the sky, but the sun will still shine.

Today, the highest temperature will be 71.6°F, while the lowest temperature will be 44.6°F.
The maximum temperature will be uncommonly higher than the average highest temperature of 59°F in October. The lowest temperature will be in line with the average low of 43.9°F.

On Wednesday, in Crystal Lake, sunrise will be at 7:13 am and sunset at 6:02 pm (CDT).

Today, the daylight will last for 10h and 49min.