Cortlandt Manor weather in September

In September, Cortlandt Manor sees average daytime highs of 74°F and overnight lows near 58°F, with 4.0 in of rain across 9.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 78°F in the first days to 69°F by the end. The sky is clear or mostly clear about 36% 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 Cortlandt Manor's 2nd-clearest and 9th-windiest month. For the whole year in context, see Cortlandt Manor's year-round climate.

Daytime high
74°
4th warmest
Overnight low
58°
9th coldest
Rainfall
4.0 in
9.1 wet days
Daylight
12 h 18 min
5:42 AM – 5:58 PM
Cloud cover
56%
2nd clearest
Wind
6 mph
9th windiest
Solar energy
4.18 kWh/m²
Travel score
6.9
out of 10

Cortlandt Manor is human settlement in Cortlandt, New York, United States of America.

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 69°F by the end.

A typical September day in Cortlandt Manor reaches about 74°F in the afternoon and slips back to 58°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 65°F and 83°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17863
27863
37863
47862
57762
67762
77762
87661
97661
107660
117560
127560
137559
147459
157459
167458
177358
187358
197357
207257
217256
227156
237156
247156
257055
267055
277055
286954
296954
306853

How September really feels in Cortlandt Manor

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.

Cortlandt Manor weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan36° / 24°3.49.35.49.40.0
Feb39° / 24°3.08.84.510.30.0
Mar47° / 32°4.110.53.711.71.4
Apr59° / 42°3.710.80.613.14.3
May68° / 52°3.711.8014.36.0
Jun78° / 61°3.911.5014.96.4
Jul83° / 67°3.910.8014.75.8
Aug81° / 66°4.010.5013.76.4
Sep74° / 58°4.09.1012.36.9
Oct62° / 47°4.18.80.110.95.5
Nov51° / 37°3.28.30.79.72.6
Dec41° / 29°4.0103.79.10.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25248
35347
45248
55347
65347
75347
85446
95446
105446
115446
125446
135446
145446
155446
165446
175446
185347
195248
205248
215248
225149
235149
245149
255149
265248
275248
285248
295248
305248

Chance of precipitation in September

Any precipitation

Cortlandt Manor gets around 4.0 in of rain over 9.1 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 29% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
529
629
729
830
930
1030
1130
1230
1330
1430
1530
1629
1729
1829
1929
2029
2129
2229
2330
2430
2530
2630
2730
2830
2930
3030

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 41% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1232425198
2242525198
3252524188
4262523188
5272623178
6282622177
7292622167
8302621167
9312621166
10322620156
11342620156
12352620155
13372519145
14382519144
15402419134
16422418133
17432318123
18452318122
19462218122
20482217112
21492117112
22502117111
23532016101
2454201691
2555191691
2657191581
2759181580
2860181570
2961181470
3062181460

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 6 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
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:26 AM to 5:56 AM, and sunset from 6:24 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:266:24
212.95:276:23
312.95:286:21
412.85:296:19
512.85:306:17
612.75:316:16
712.75:326:14
812.65:336:12
912.65:346:10
1012.65:356:09
1112.55:366:07
1212.55:386:05
1312.45:396:03
1412.45:406:02
1512.35:416:00
1612.35:425:58
1712.25:435:56
1812.25:445:54
1912.15:455:53
2012.15:465:51
2112.05:475:49
2212.05:485:47
2311.95:495:45
2411.95:505:44
2511.85:515:42
2611.85:525:40
2711.85:535:38
2811.75:545:37
2911.75:555:35
3011.65:565:33

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.18 kWh/m².

For context, solar energy here swings from a low near 1.69 kWh/m² to a high of 5.95 kWh/m² in June across the year — September's 4.18 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.7Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.1Bright
204.0Bright
214.0Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.7Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Cortlandt Manor

In seasonPeak

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

Cortlandt Manor 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 Cortlandt Manor?

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
5.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Cortlandt Manor for sightseeing.

What to pack for Cortlandt Manor in September

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

In September, Cortlandt Manor sees daytime highs around 74°F and nights near 58°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Cortlandt Manor 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 28 mi away) is warmest in August at about 74°F and coldest in February near 35°F.

It's comfortable for a long swim from Jun 30 to Sep 30 — about 3.1 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan39Bracing
Feb35Bracing
Mar37Bracing
Apr44Bracing
May55Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct64Cool
Nov55Bracing
Dec46Bracing

UV index in Cortlandt Manor 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 Cortlandt Manor peaks around July 10 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 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 10UV 8Dec 23UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Cortlandt Manor 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 Cortlandt Manor is worst in July — around 20 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJul 1220 µg/m³Nov 1612 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar17Moderate
Apr17Moderate
May18Moderate
Jun19Moderate
Jul20Moderate
Aug17Moderate
Sep16Moderate
Oct13Moderate
Nov11Good
Dec13Moderate
Location & terrain

Where is Cortlandt Manor?

Cortlandt Manor sits at 41.3°N, 73.9°W, 440 ft above sea level, in United States. The nearest listed city is Peekskill, 2.5 mi away.

Topography around Cortlandt Manor

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

Within 2 miles, the terrain around Cortlandt Manor has only modest variations in elevation — a maximum elevation change of 623 ft around an average of 423 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,585 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,304 ft.

The land around Cortlandt Manor is covered by trees (90%) within 2 miles, trees (79%) within 10 miles, and trees (72%) within 50 miles.

2 miles
623 ft
10 miles
1,585 ft
50 miles
3,304 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Peekskill 2.5 mi · Ossining 8.1 mi · New City 11 mi · Spring Valley 14 mi · Nanuet 15 mi · Monsey 16 mi · Kiryas Joel 16 mi · Newburgh 17 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 Cortlandt Manor (41.28°, -73.8716°, elevation 440 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).