Greenwich Weather in September

During September, Greenwich experiences high daytime temperatures of 25°C (77°F) and cooler nights around 15°C (59°F). Expect quite a bit of rainfall. Around 100 mm (3.9 in) is typical.

Rainfall in Greenwich in September

Historically, the month has about 10 days of rain, averaging 100 mm (3.9 in) in total. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Greenwich in September

September in Greenwich brings high temperatures, with highs of 25°C (77°F) and nights around 15°C (59°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 15°C (59°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Greenwich in September

Expect a lot of sunshine this month, with about 218 hours of sun. These sunny conditions add to the overall experience.

Should you favor a climate that's both dry and comfortably warm, July typically offers the most agreeable 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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• January
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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 Greenwich's climate page.

Greenwich Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 33%  

Precipitation 100 mm (3.9 in)  

Rainy days 10 days  

Humidity 68% *  

Sunshine 218 hours *  

Percentage Sunshine 59% *  

* Data from: New York City, the United States of America (36 KM, 22 Miles).

What to Wear in Greenwich 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Greenwich in September

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

Swimming

9/10

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

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 Greenwich's climate page.

More climate data for Greenwich

Temperature Rainfall Sunshine Humidity

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