Manhattan Valley weather in September

In September, Manhattan Valley sees average daytime highs of 74°F and overnight lows near 62°F, with 3.7 in of rain across 9.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 78°F in the first days to 70°F by the end. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Manhattan Valley's 2nd-clearest and 9th-windiest month. For the whole year in context, see Manhattan Valley's year-round climate.

Daytime high
74°
4th warmest
Overnight low
62°
9th coldest
Rainfall
3.7 in
9.4 wet days
Daylight
12 h 18 min
5:42 AM – 5:58 PM
Cloud cover
55%
2nd clearest
Wind
7 mph
9th windiest
Solar energy
4.16 kWh/m²
Travel score
6.9
out of 10

Manhattan Valley is populated place in New York County, New York, United States.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 78°F in the first days to 70°F by the end.

A typical September day in Manhattan Valley reaches about 74°F in the afternoon and slips back to 62°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 82°F. Set against its neighbours, September runs about 7°F cooler than August and about 11°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17967
27967
37866
47866
57866
67865
77765
87765
97765
107664
117664
127664
137663
147563
157563
167462
177462
187462
197461
207361
217360
227360
237260
247259
257159
267159
277158
287058
297057
306957

How September really feels in Manhattan Valley

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Manhattan Valley weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan38° / 26°3.29.14.29.40.0
Feb40° / 27°3.08.33.510.40.1
Mar47° / 35°4.110.22.911.71.6
Apr59° / 46°3.610.60.313.14.4
May69° / 55°3.310.9014.26.2
Jun78° / 65°3.911.2014.96.4
Jul83° / 71°4.011.2014.65.6
Aug81° / 69°4.010.4013.66.3
Sep74° / 62°3.79.4012.36.9
Oct64° / 51°3.88.5010.95.8
Nov53° / 41°3.180.49.73.1
Dec43° / 32°3.99.72.69.10.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25446
35347
45248
55248
65248
75347
85347
95347
105347
115347
125347
135347
145347
155347
165248
175149
185248
195149
205149
215050
225149
235149
245050
255050
265149
275149
285248
295248
305347

Chance of precipitation in September

Any precipitation

Manhattan Valley gets around 3.7 in of rain over 9.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
329
429
529
629
730
830
930
1030
1130
1230
1330
1430
1530
1630
1730
1830
1930
2030
2131
2231
2331
2431
2531
2631
2731
2831
2931
3031

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 25% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11021272714
21121272614
31221272514
41321272513
51422272413
61622272312
71722272311
81822272311
91922272210
10212226229
11222226219
12242226218
13252225217
14262225206
15282225206
16292224195
17312224194
18322323184
19332323183
20352322173
21362322172
22372421162
23392420152
24402419152
25422419141
26432418131
27452417121
28462417121
29482416111
30502415101

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:27 AM to 5:57 AM, and sunset from 6:24 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:276:24
212.95:286:22
312.95:296:21
412.85:306:19
512.85:316:17
612.75:326:16
712.75:336:14
812.65:346:12
912.65:356:10
1012.55:366:09
1112.55:376:07
1212.55:386:05
1312.45:396:03
1412.45:406:02
1512.35:416:00
1612.35:425:58
1712.25:435:56
1812.25:445:55
1912.15:455:53
2012.15:465:51
2112.05:475:49
2212.05:485:48
2311.95:495:46
2411.95:505:44
2511.85:515:42
2611.85:525:41
2711.85:535:39
2811.75:555:37
2911.75:565:35
3011.65:575:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.16 kWh/m².

For context, solar energy here swings from a low near 1.75 kWh/m² to a high of 5.94 kWh/m² in June across the year — September's 4.16 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.2Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
214.0Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Manhattan Valley

In seasonPeak

In September, Manhattan Valley sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Manhattan Valley sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Manhattan Valley?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.9
Sightseeing
1st-best month of the year
5.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Manhattan Valley for sightseeing.

What to pack for Manhattan Valley in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Manhattan Valley sees daytime highs around 74°F and nights near 62°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Manhattan Valley in September

The nearest coast averages about 71°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 12 mi away) is warmest in August at about 74°F and coldest in February near 40°F.

It's comfortable for a long swim from Jun 30 to Sep 26 — about 2.9 months when the water holds above 68°F.

40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan43Bracing
Feb40Bracing
Mar41Bracing
Apr46Bracing
May55Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct63Cool
Nov55Bracing
Dec48Bracing

UV index in Manhattan Valley in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Manhattan Valley peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 11UV 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Manhattan Valley in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Manhattan Valley is worst in July — around 18 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (November, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1318 µg/m³Nov 1410 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar16Moderate
Apr16Moderate
May17Moderate
Jun17Moderate
Jul18Moderate
Aug16Moderate
Sep14Moderate
Oct11Good
Nov10Good
Dec12Good
Location & terrain

Where is Manhattan Valley?

Manhattan Valley sits at 40.8°N, 74.0°W, 89 ft above sea level, in United States. The nearest listed city is Upper West Side, 0.6 mi away.

Topography around Manhattan Valley

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Manhattan Valley.

Within 2 miles, the terrain around Manhattan Valley has only modest variations in elevation — a maximum elevation change of 259 ft around an average of 72 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 581 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,909 ft.

The land around Manhattan Valley is covered by artificial surfaces (52%), water (27%) and trees (20%) within 2 miles, artificial surfaces (57%) and trees (20%) within 10 miles, and trees (54%) and water (27%) within 50 miles.

2 miles
259 ft
10 miles
581 ft
50 miles
1,909 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Upper West Side 0.6 mi · Manhattan 0.6 mi · Morningside Heights 1.2 mi · East Harlem 1.2 mi · Harlem 1.2 mi · Cliffside Park 2.5 mi · Astoria 2.5 mi · Hell's Kitchen 2.5 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Manhattan Valley (40.7939°, -73.965°, elevation 89 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).