Hyannis Weather in September

In Hyannis, September brings high daytime temperatures around 23°C (73°F), with nights cooling to 14°C (57°F). Expect quite a bit of rainfall this month.

Rainfall in Hyannis in September

The climate data from previous years indicates about 8 days of rain, averaging 104 mm (4.1 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Hyannis in September

Daytime temperatures in Hyannis reach 23°C (73°F) in September, dropping to 14°C (57°F) at night. The month of September belongs to the summer season. Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 14°C (57°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Hyannis in September

The month enjoys around 231 hours of sunshine, creating mostly sunny days with good weather conditions.

For Hyannis itself, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.