Crystal Lake

Lincoln County, Illinois, United States

Unlock Minute-by-Minute Forecast

See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.

Current Weather

18°

Overcast

Feels Like: 11°

Min: 16°

Max: 21°

The next few hours will be overcast, with today reaching 21°C and dropping to 12°C. The coming days will be drizzle

Unlock Historical Data

Compare today's weather with yesterday's data and track temperature trends over time.

Hourly Forecast

18° 18° 19° 21° 21° 21° 21° 21° 21° 20° 19° 18° 17° 17° 17° 16° 16° 15° 13° 12° 12° 12° 12° 12°
8am
9am
10am
11am
12pm
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm
11pm
12am
1am
2am
3am
4am
5am
6am
7am
Today
Tomorrow

Daylight Hours

06:40

Sunrise

18:53

Sunset

12 hours 13 minutes of sunlight today

Moon

Waxing Crescent

12:41

Moonrise

20:54

Moonset

Daily Forecast

Today

16°
21°

Thursday

11°
20°

Friday

10°
21°

Saturday

18°

Sunday

19°

Monday

21°

Tuesday

22°

Wednesday

22°

Thursday

11°
22°

Friday

14°
22°

Air Quality Data Available

Upgrade to access real-time air quality data for Crystal Lake.

UV Index

No protection needed
0 Low
Low Extreme

Humidity

82% Humid
Low High

Weather in Crystal Lake today, September 16, 2026

Expect a muted, overcast feel in Crystal Lake on September 16, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. The morning sky stays heavily clouded, with cover near 100% around 09:00. Grey conditions set the early tone before any later change.

Temperatures climb from an overnight low near 16°C toward a daytime high of about 21°C. Expect humidity between 71% and 86%, most humid near 10:00. Airflow remains manageable, reaching about 4.2 km/h around 08:00.

Expect persistent cloud later on, with amounts around 100% by 12:00. Sunshine remains the exception, not the rule. Expect visibility around 16.1 km. Sunrise is at 06:40 and sunset at 18:53, giving 12 hours 13 minutes of sunlight today.

Overall, Crystal Lake on September 16, 2026 stays grey and muted, so outdoor plans may want a flexible backup even with a high near 21°C.

Frequently asked questions about weather in Crystal Lake

How warm does it get in Crystal Lake?

The warmest month in Crystal Lake is July, with average high temperatures of 28°C. The average temperature during this period is around 24°C.

How cold does it get in Crystal Lake?

The coldest month in Crystal Lake is January, with average low temperatures of -7°C. The average temperature during this period is around -4°C.

What is the wettest time of year in Crystal Lake?

The wettest month in Crystal Lake is May, with an average of 123mm of precipitation.

What is the driest time of year in Crystal Lake?

The driest month in Crystal Lake is February, with an average of 49mm of precipitation.

View full climate insights for Crystal Lake →

Airpult

Get accurate weather forecasts worldwide with real-time updates and severe weather alerts. Covering 6M+ locations with precise, reliable weather data.

© 2026 Samuenti GmbH. All rights reserved.

gb English
Metric (°C, km/h)