Weather In Ny In Sept

Gombloh

-Apr 10, 2026, 3:16 AM

Sits around the middle of the year. September in context How it compares to the rest of the year in New York. Typical rainfall for the year. Around the yearly average. Close to the yearly wind average. Near the middle of the yearly UV range. The muggiest month of the year. Monthly climate breakdown A detailed look at the typical climate conditions for September.

Thermal profile Temperature Typical daytime high - Nighttime low - - Feels like (avg) - Light window Sunshine 12.4 h Average daylight - UV index (max) - 7 - Typical sun hours - 05:37 - 18:04 Wet-day pattern Rain & Snow Typical rainfall - Rainy days - 11 days - Cloud cover (avg) - 52% Air feel Humidity & Wind 74% Average humidity - Wind (avg) - - Wind (max gusts) - Historical daily baseline Daily climate explorer Pick a day to inspect the usual conditions through September in New York.

Based on a 30-year historical climate baseline, not a forecast. Primary control Select a day Scroll to compare daily conditions. The summary updates with your selection. Secondary context Monthly trend Median daytime highs across the month, with a softer low line. Day 15 selected for September. Temperature 22.9°C. Historical disruption baseline Typical disruptions in September Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in September. Rain disruption Measures: Likely rain disruption days. Observed about 17% of days (5.0 days/month) in September.

Historical risk signal only, not a day-by-day forecast. Likely frequency 5.0 days / month - Share of days - ~17% of days - Upper edge - Up to ~50mm (P95) Why this matters Rain disruption risk appears on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. Washout risk Measures: Washout day risk. Observed about 15% of days (4.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 4.6 days / month - Share of days - ~15% of days - Upper edge - Up to ~50mm (P95) Why this matters Washout conditions are possible on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. Stormy conditions Measures: Storm-impact proxy days. Observed about 4% of days (1.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 1.1 days / month - Share of days - ~4% of days - Upper edge - Up to ~80km/h (P95) Why this matters Stormy conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready. Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 3% of days (0.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.8 days / month - Share of days - ~3% of days - Upper edge - Up to ~80km/h (P95) Why this matters Strong gusts are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready. Very hot feels-like Measures: Very hot feels-like days (>=35C). Observed about 2% of days (0.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.6 days / month - Share of days - ~2% of days - Upper edge - Up to ~38°C (P95) Why this matters Very hot feels-like conditions are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options. Muggy days Measures: Muggy days (dew point >=20C). Observed about 9% of days (2.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 2.8 days / month - Share of days - ~9% of days - Upper edge - Up to ~23°C (P95) Why this matters Muggy conditions are possible on ~3 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Show all disruptions (23 more) Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 11% of days (3.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 3.3 days / month - Share of days - ~11% of days - Upper edge - Up to ~53mm (P95) Why this matters Heavy rain is possible on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. Washout run Measures: Multi-day washout runs. Observed about 1.0 days/month in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 1.0 days / month - Share of days - — - Upper edge - Up to ~46mm (P95) Why this matters Multi-day washout runs are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. Very heavy rain Measures: Very heavy rain days (>=25mm). Observed about 3% of days (0.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.9 days / month - Share of days - ~3% of days - Upper edge - Up to ~103mm (P95) Why this matters Very heavy rain is possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. Extreme rain Measures: Extreme rain days (>=50mm). Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.2 days / month - Share of days - ~1% of days - Upper edge - Up to ~119mm (P95) Why this matters Extreme rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 6% of days (1.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 1.8 days / month - Share of days - ~6% of days - Upper edge - Up to ~38°C (P95) Why this matters Feels-like heat >=32C is possible on ~2 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options. Hot days Measures: Hot days (>=30C). Observed about 6% of days (1.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 1.7 days / month - Share of days - ~6% of days - Upper edge - Up to ~34°C (P95) Why this matters Hot days are possible on ~2 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options. Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 5% of days (1.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 1.6 days / month - Share of days - ~5% of days - Upper edge - Up to ~98% (P95) Why this matters Fog-likely conditions are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 44% of days (13.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 13.2 days / month - Share of days - ~44% of days - Upper edge - Up to ~100% (P95) Why this matters Cloudy skies are possible on ~13 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Wet days Measures: Wet days (>=0.1mm). Observed about 42% of days (12.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 12.7 days / month - Share of days - ~42% of days - Upper edge - Up to ~30mm (P95) Why this matters Measurable rain is possible on ~13 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 32% of days (9.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 9.6 days / month - Share of days - ~32% of days - Upper edge - Up to ~21h (P95) Why this matters Several rainy hours are possible on ~10 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. High humidity Measures: High humidity days (RH >=80%). Observed about 31% of days (9.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 9.2 days / month - Share of days - ~31% of days - Upper edge - Up to ~94% (P95) Why this matters High humidity is possible on ~9 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops. Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 27% of days (8.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 8.2 days / month - Share of days - ~27% of days - Upper edge - Up to ~100% (P95) Why this matters Mostly cloudy skies are possible on ~8 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Humid days Measures: Humid days (dew point >=18C). Observed about 22% of days (6.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 6.7 days / month - Share of days - ~22% of days - Upper edge - Up to ~22°C (P95) Why this matters Humid conditions are possible on ~7 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops. Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 22% of days (6.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 6.6 days / month - Share of days - ~22% of days - Upper edge - Up to ~22h (P95) Why this matters Wet-most-of-day conditions are possible on ~7 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times. Gusty days Measures: Gusty days (>=40 km/h). Observed about 17% of days (5.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 5.1 days / month - Share of days - ~17% of days - Upper edge - Up to ~75km/h (P95) Why this matters Gusty conditions are possible on ~5 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready. Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 13% of days (3.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 3.8 days / month - Share of days - ~13% of days - Upper edge - Up to ~100% (P95) Why this matters Overcast skies are possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Convective risk Measures: Convective storm risk proxy. Observed about 8% of days (2.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 2.5 days / month - Share of days - ~8% of days - Upper edge - Up to ~22°C (P95) Why this matters Convective risk signal appears on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 5% of days (1.6 days/month) in September.

Historical risk signal only, not a day-by-day forecast. Likely frequency 1.6 days / month - Share of days - ~5% of days - Upper edge - Up to ~98 (P95) Why this matters Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Warm nights Measures: Warm nights (min >=22C). Observed about 2% of days (0.6 days/month) in September.

Historical risk signal only, not a day-by-day forecast. Likely frequency 0.6 days / month - Share of days - ~2% of days - Upper edge - Up to ~24°C (P95) Why this matters Warm nights are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing. Heat stress risk Measures: High heat stress days. Observed about 2% of days (0.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.6 days / month - Share of days - ~2% of days - Upper edge - Up to ~38°C (P95) Why this matters Heat stress is possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options. Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.2 days / month - Share of days - ~1% of days - Upper edge - Up to ~31km/h (P95) Why this matters Breezy conditions are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready. Feels-like heatwave Measures: Feels-like heatwave runs (>=3 days). Observed about 0.2 days/month in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.2 days / month - Share of days - — - Upper edge - Up to ~37°C (P95) Why this matters Feels-like heatwave runs are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options. Heatwave run Measures: Heatwave runs (>=3 hot days). Observed about 0.2 days/month in September. Historical risk signal only, not a day-by-day forecast.

Likely frequency 0.2 days / month - Share of days - — - Upper edge - Up to ~35°C (P95) Why this matters Heatwave runs are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options. Travel planning FAQ Frequently asked questions Quick answers to the weather questions you ask the most. Is September a good time to visit New York? Typical September days in New York reach highs of 24°C (75°F) with nights around 16°C (61°F).

It usually feels warm by day and mild after dark. Overall, September sits in the middle of the New York climate range. What are temperatures like in September? In September, you can usually expect highs of 24°C (75°F) and lows near 16°C (61°F). That means warm days and mild nights, so pack layers you can add or remove. How much does it rain in September? Rainfall in September averages 104 mm (4.1 in) across roughly 11 days.

Overall it is a quite rainy time of year, so a light rain jacket and waterproof shoes are very handy. How many hours of daylight are there in September? You can expect about 12 hours of daylight in September. Sunrise is typically around 05:37 and sunset near 18:04. Daylight is fairly typical, with enough time for sightseeing. How strong is the sun in September? UV levels are often high (around 7). Regular sunscreen and a hat are recommended. Is it windy in September?

In September, average wind speeds are around 11 km/h (7 mph), with gusts on the windiest days reaching about 45 km/h (28 mph). On the ground, it is it often feels breezy, especially in more exposed spots or along the coast.

Weather In Ny In Sept

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