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.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Hyannis's climate page.

Hyannis Temperature in September

Min Temperature 14°C (57°F)  

Max Temperature 23°C (73°F)  

Chance of Rain 25%  

Precipitation 104 mm (4.1 in)  

Rainy days 8 days  

Sunshine 231 hours *  

Percentage Sunshine *  

* Data from: Nantucket, the United States of America (43 KM, 27 Miles).

What to Wear in Hyannis in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Hyannis in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Hyannis's climate page.

More climate data for Hyannis

Temperature Rainfall Sunshine

See the full Hyannis climate overview or explore weather in the United States of America.