This post is a summary of the September weather in New York City, with tips on what to wear as well as things to do. The weather in September in NYC is pleasantly warm with high temperatures ranging between 70 – 8o degrees Fahrenheit (21 – 26 C) and low temperatures ranging between 55 – 65 degrees Fahrenheit (13 – 18 C), while the risk for extended hot spells that are common during July and August is greatly reduced. It’s a sunny month with an average of 21 days of sunny or partially sunny skies. If you are planning to visit New York City in September, you have picked a great month for outdoor activities including walking tours of the city.
Early September enjoys daytime high temperatures in the upper 70’s to near 80 F (about 26 C) while near the end of the month the daytime high temperatures are more likely to be near 70f (21C). It’s still recommended to have sunscreen during the day, as the sun has the potential to do damage to unprotected skin.
Nighttime (and early morning) low temperatures are in the mid 60’s (about 18 C) early in September falling to the mid 50’s (about 13 C) by the end of the month. It’s advisable to pack at least one sweater and/or light jacket. Days, when the high temperature reaches or exceeds 90 F (32 C), occur on average just 1 day early in the month, while low temperatures falling below 50 F (10 C) occur only 2 days near the end of the month.
New York weather in September consists of, on average, about 21 days with clear or partly sunny skies (about 70% of the time). The risk for a cloudy day with some rain is about 30%, however, significant rainy days where 1/2 inch (13 mm) or more rain falls will occur less than 10% of the time.
Depending on when in September you are coming, your What to Pack list may vary.
Early to Mid September
Lightweight long pants, slacks, jeans, leggings are all good. It’s not yet cool enough for wool, so cotton or other material is good.
A pair of shorts will help on any surprise hot days. Women, light to medium weight dresses and skirts are just fine.
A mix of short sleeve tops and light long sleeve shirts should work well.
A warm sweater, thick hoodie or medium weight jackets are a must for the nights.
You might get away with sandals or open toe shoes for the first week or so, but make sure to have closed-toe shoes and sneakers – especially those good for walking. September is wonderful weather to walk around the city.
Believe it or not, throw in a swimsuit. If you love the beach, early September can be a splendid time for a trip to the beach. The water is warm and you may get a surprise hot day!
Mid to Late September
Medium weight long pants, slacks, and jeans are good. Cotton or lightweight wool should keep you warm. For women who like skirts and dresses, leave that spaghetti strap dress at home. Long sleeve dresses and heavy cotton/light weight wool skirts are fine.
Mostly you will want long sleeve shirts but throw in a short sleeve shirt to keep your options open.
Definitely, bring along a jacket or coat. It still isn’t time for heavy wool or cashmere, but the nights will be a little brisk. Sweaters and hoodies are always good for layering.
It’s a bit late for sandals and open toe shoes, so stick with shoes, light hiking boots, and sneakers. You will still be doing some walking, but warm feet at night will make you happy.
Throw in an umbrella, just in case. Though the minute rain hits, umbrella vendors pop up immediately on every corner!
New York Caribbean Carnival September 4
It’s hot, hot, hot with the colorful, flavorful and lively parade that starts in Crown Heights, Brooklyn and ends in Park Slope. There will be floats with fantastic dancers shaking their stuff to the sounds of Caribbean culture.
U.S. Open Tennis Championship September 1-10 (begins Aug. 28)
See the top-seeded tennis players in the world at one of the most exciting annual tennis tournaments. Favorites like Venus Williams, Caroline Wozniacki, Roger Federer, and Rafael Nadal will be there. The Open takes place in Flushing, Queens – known for its large Korean and Chinese population. You will need to take the 7 train there. You may find our post Navigating the New York Subway helpful.
Taste of North BrooklynSeptember 17 Head out to East River State Park to try tasty morsels from over 40 local restaurateurs. A great reason to take the East River Ferry which stops right nearby – and it’s the same cost as the subway!
Free Museum Day September 23
Get a free ticket for two people at many museums throughout all of NY State. For a list of museums that are free or almost free year round, click here.