September Weather in Old Saybrook

Last updated: March 2, 2024

The weather in Old Saybrook, United States, during September is characterized by an average temperature of 20°C (69°F). Highs can soar to 26°C (80°F), while lows may dip to 12°C (55°F). Typically, the humidity level in Old Saybrook throughout September hovers around 68%.

12°C (55°F)

Minimum temperature

20°C (69°F)

Average temperature

26°C (80°F)

Maximum temperature

68%

Humidity

Precipitation and Sunshine hours

In September, Old Saybrook averages 98 mm (3.9 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 12 hours 24 minutes of daylight, with the sun shining for approximately 9 hours 21 minutes each day. Additionally, there is a 47% probability of sunny days during this period.

98 mm (3.9 inches)

Precipitation

9 rainy days

Rainy days

9 hours 21 minutes

Sunshine hours

47%

Chance of sun

UV Index

In September, the UV Index in Old Saybrook reaches a maximum of 8, 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 4 6 8 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 Old Saybrook's Climate with Cities Worldwide