Weather forecast for todayCrystal Lake, IL

Weather forecast for today

Current condition 1:36 am CDT

  • 46°F
  • Feels like:
    46°F
Fair
Fair
  • Precipitation: 0"
  • Wind: 1mphNNW 340°
  • Humidity: 78%
  • Dewpoint: 41°F
  • Pressure: 30.31"Hg
  • Visibility: 8mi
  • UV index: 0
  • ▼
In Crystal Lake, at the moment, the sky is cloud-free, maintaining fair weather throughout the day.
The temperature is a chilly 46.4°F. The current temperature is almost at the minimum-predicted 44.6°F for today.

Wednesday Oct 21, 2026

  • 72°F
  • 45°F
Sunny
Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 5mphSW 221°
  • Humidity: 56%
  • UV index: 4
  • Sunrise: 7:13 am CDT
  • Sunset: 6:02 pm CDT
  • ▼
On Wednesday, October 21, sunny skies and pleasant visibility are expected.
Temperatures will show considerable variation, extending from a high of an agreeable 71.6°F to a low of a frosty 44.6°F.
It will feel warmer than usual, as the temperature reflects September's normal high of 72.5°F, not October's.
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: 5 am 41°C.

Chance of precipitation

Highest chance: 11 pm 5%.

Hourly weather forecast

  • 2 am
  • 46°F
  • Feels like:
    46°F
Mostly Clear
Mostly Clear
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 1mphSSE 164°
  • Humidity: 80%
  • Pressure: 30.3"Hg
  • Visibility: 8mi
  • UV index: 0
  • ▼
  • 4 am
  • 45°F
  • Feels like:
    45°F
Mostly Clear
Mostly Clear
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 1mphS 171°
  • Humidity: 83%
  • Pressure: 30.27"Hg
  • Visibility: 9mi
  • UV index: 0
  • ▼
  • 6 am
  • 41°F
  • Feels like:
    41°F
Mostly Clear
Mostly Clear
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphS 187°
  • Humidity: 90%
  • Pressure: 30.27"Hg
  • Visibility: 7mi
  • UV index: 0
  • ▼
Sunrise: 7:13 am
  • 8 am
  • 45°F
  • Feels like:
    45°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphSSW 202°
  • Humidity: 87%
  • Pressure: 30.3"Hg
  • Visibility: 9mi
  • UV index: 0
  • ▼
  • 10 am
  • 55°F
  • Feels like:
    55°F
Sunny
Sunny
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 3mphSSW 210°
  • Humidity: 66%
  • Pressure: 30.27"Hg
  • Visibility: 10mi
  • UV index: 2
  • ▼
  • 12 pm
  • 66°F
  • Feels like:
    66°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 4mphSW 218°
  • 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: 5mphSW 231°
  • 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: 5mphWSW 237°
  • 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: 3mphSW 224°
  • Humidity: 53%
  • Pressure: 30.18"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunset: 6:02 pm
  • 8 pm
  • 55°F
  • Feels like:
    55°F
Clear
Clear
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 1mphSW 230°
  • Humidity: 70%
  • Pressure: 30.21"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 pm
  • 52°F
  • Feels like:
    52°F
Mostly Clear
Mostly Clear
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 1mphWSW 256°
  • Humidity: 79%
  • Pressure: 30.21"Hg
  • Visibility: 9mi
  • UV index: 0
  • ▼
Today, in Crystal Lake, sunshine is expected.
The temperature will be between a minimum of 41°F and a maximum 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 lowest temperature is in line with October's typical minimum of 43.9°F.
Updated: Oct 21, 2026 @ 06:36:47 UTC
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

The current temperature (1:36 am CDT) is 46.4°F.

On Wednesday, skies are expected to be clear and full of sunshine.

Today, the highest temperature will be 71.6°F, while the lowest temperature will be 44.6°F.
The highest temperature will be significantly higher than the average maximum 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).

In Crystal Lake, the length of the day today will be 10h and 49min.