September Weather in Janesville

Last updated: March 2, 2024

The weather in Janesville, United States, during September is characterized by an average temperature of 17°C (63°F). Highs can soar to 34°C (93°F), while lows may dip to 3°C (37°F). Typically, the humidity level in Janesville throughout September hovers around 46%.

3°C (37°F)

Minimum temperature

17°C (63°F)

Average temperature

34°C (93°F)

Maximum temperature

46%

Humidity

Precipitation and Sunshine hours

In September, Janesville averages 19 mm (0.7 inches) of rainfall, typically over the course of 3 rainy days. The month enjoys an average of 12 hours 23 minutes of daylight, with the sun shining for approximately 10 hours 41 minutes each day. Additionally, there is a 82% probability of sunny days during this period.

19 mm (0.7 inches)

Precipitation

3 rainy days

Rainy days

10 hours 41 minutes

Sunshine hours

82%

Chance of sun

UV Index

In September, the UV Index in Janesville reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 5 7 9 9 8 7 4 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 Janesville's Climate with Cities Worldwide