Roslyn Weather in September

September in Roslyn brings high temperatures, with daytime highs of 25°C (77°F) and nights around 16°C (61°F). Quite a bit of rainfall is expected, around 89 mm (3.5 in), so pack an umbrella.

Rainfall in Roslyn in September

Analyzing past climate data, one can expect approximately 8 days of rain, averaging 89 mm (3.5 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Roslyn in September

Roslyn in September has excellent weather. Days reach 25°C (77°F) and nights cool to 16°C (61°F). This kind of day-to-night contrast is typical for this time of year. With overnight lows of 16°C (61°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Roslyn in September

The city usually sees around 218 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Roslyn 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

The water is 20°C (68°F) this month — a comfortable temperature that most swimmers enjoy. Warm enough to stay in without getting cold quickly.

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

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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 Roslyn's climate page.

Roslyn Temperature in September

Min Temperature 16°C (61°F)  

Max Temperature 25°C (77°F)  

Water Temperature 20°C (68°F) *  

Chance of Rain 27%  

Precipitation 89 mm (3.5 in)  

Rainy days 8 days  

Humidity 68% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 218 hours *  

Percentage Sunshine 59% *  

* Data from: New York City, the United States of America (21 KM, 13 Miles).

What to Wear in Roslyn in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. With water temperatures around 20°C (68°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Roslyn 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 Roslyn's climate page.

More climate data for Roslyn

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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