September Weather in Greenwich

Last updated: March 2, 2024

The weather in Greenwich, United States, during September is characterized by an average temperature of 20°C (67°F). Highs can soar to 31°C (89°F), while lows may dip to 7°C (45°F). Typically, the humidity level in Greenwich throughout September hovers around 78%.

7°C (45°F)

Minimum temperature

20°C (67°F)

Average temperature

31°C (89°F)

Maximum temperature

78%

Humidity

Precipitation and Sunshine hours

In September, Greenwich averages 79 mm (3.1 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 24 minutes of daylight, with the sun shining for approximately 9 hours 34 minutes each day. Additionally, there is a 55% probability of sunny days during this period.

79 mm (3.1 inches)

Precipitation

10 rainy days

Rainy days

9 hours 34 minutes

Sunshine hours

55%

Chance of sun

UV Index

In September, the UV Index in Greenwich 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 2 3 5 7 8 8 6 5 3 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 Greenwich's Climate with Cities Worldwide