Cambridge Weather in September

September in Cambridge brings high temperatures, with daytime highs of 24°C (75°F) and nights around 13°C (55°F). Rainfall is at its lowest this month, making it one of the more reliable months to be outdoors.

Rainfall in Cambridge in September

September is the month with the least rainfall. Whether you're keen on hiking, outdoor festivals, or just enjoying a walk, this month provides a reliably dry backdrop for all your plans. Historically, approximately 9 days this month are expected to have rain, averaging 81 mm (3.2 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Cambridge in September

September is a perfect month in Cambridge, with 24°C (75°F) during the day and 13°C (55°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 13°C (55°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Cambridge in September

The city usually sees around 238 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Cambridge in September

Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

Average water temperature in September

At 18°C (64°F), the water is getting there — comfortable enough for most swimmers, though those used to warmer seas may still find it a touch cool.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Cambridge.

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Check the conditions for any month of the year.

• January
• February
• March
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• May
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• 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 Cambridge's climate page.

Cambridge Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 24°C (75°F)  

Water Temperature 18°C (64°F) *  

Chance of Rain 30%  

Precipitation 81 mm (3.2 in)  

Rainy days 9 days  

Humidity 69% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 238 hours *  

Percentage Sunshine 63% *  

* Data from: Boston, the United States of America (5 KM, 3 Miles).

What to Wear in Cambridge in September

For Cambridge in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With water temperatures around 18°C (64°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Cambridge 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 Cambridge's climate page.

More climate data for Cambridge

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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