September Weather in Crystal Lake

Last updated: March 2, 2024

The weather in Crystal Lake, United States, during September is characterized by an average temperature of 19°C (66°F). Highs can soar to 31°C (88°F), while lows may dip to 6°C (44°F). Typically, the humidity level in Crystal Lake throughout September hovers around 68%.

6°C (44°F)

Minimum temperature

19°C (66°F)

Average temperature

31°C (88°F)

Maximum temperature

68%

Humidity

Precipitation and Sunshine hours

In September, Crystal Lake averages 101 mm (4.0 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 12 hours 25 minutes of daylight, with the sun shining for approximately 9 hours 1 minutes each day. Additionally, there is a 41% probability of sunny days during this period.

101 mm (4.0 inches)

Precipitation

9 rainy days

Rainy days

9 hours 1 minutes

Sunshine hours

41%

Chance of sun

UV Index

In September, the UV Index in Crystal Lake reaches a maximum of 8, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 1 3 4 6 7 8 7 5 3 2 1 1
Exposure Low Moderate High VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 25 min 30 min 45 min

Compare Crystal Lake's Climate with Cities Worldwide