Harrison weather in September

In September, Harrison sees average daytime highs of 74°F and overnight lows near 61°F, with 3.7 in of rain across 9.1 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 69°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 Harrison's 2nd-clearest and 9th-windiest month. For the whole year in context, see Harrison's year-round climate.

Daytime high
74°
4th warmest
Overnight low
61°
9th coldest
Rainfall
3.7 in
9.1 wet days
Daylight
12 h 18 min
5:41 AM – 5:57 PM
Cloud cover
55%
2nd clearest
Wind
6 mph
9th windiest
Solar energy
4.19 kWh/m²
Travel score
7.0
out of 10

Harrison is community (coterminous town-village) in Westchester County, New York, United States.

Density
630/km²
people per km²
Founded
1696

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 Harrison reaches about 74°F in the afternoon and slips back to 61°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 66°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)
17866
27865
37865
47865
57765
67764
77764
87664
97664
107663
117663
127562
137562
147462
157461
167461
177461
187360
197360
207360
217259
227259
237159
247158
257158
267058
277057
286957
296956
306956

How September really feels in Harrison

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.

Harrison 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
Jan37° / 26°3.394.69.40.0
Feb39° / 26°3.08.73.910.40.0
Mar46° / 33°4.110.13.211.71.4
Apr58° / 44°3.710.50.413.14.2
May68° / 54°3.411.2014.36.1
Jun77° / 64°3.810.8014.96.5
Jul83° / 70°3.810.9014.65.8
Aug81° / 68°3.910.5013.66.4
Sep74° / 61°3.79.1012.37.0
Oct63° / 50°3.98.5010.95.7
Nov52° / 40°3.28.10.59.72.8
Dec42° / 32°4.09.839.10.4

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 14% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35248
45248
55248
65347
75347
85347
95347
105446
115347
125347
135347
145446
155347
165347
175248
185149
195149
205149
215149
225050
234951
245050
254951
264951
275050
285050
295050
305248

Chance of precipitation in September

Any precipitation

Harrison gets around 3.7 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 (%)
127
228
328
428
528
628
729
829
929
1029
1129
1229
1329
1429
1529
1629
1729
1829
1930
2030
2130
2230
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 32% of days. Sticky, muggy-or-worse air turns up on roughly 23% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11324262612
21424262511
31524252511
41624252411
51724252310
61924242310
7202424229
8212424229
9232424218
10242424218
11252423207
12272423206
13282423196
14302423195
15312423185
16332422174
17342322174
18352422163
19372421163
20382421152
21392420152
22412420142
23422419132
24442419131
25452418121
26472418111
27482317111
28492317101
2951231691
3053221591

Wind in September

Winds average 6 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
196calm
206calm
216calm
226calm
236calm
246calm
256calm
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 5:26 AM to 5:56 AM, and sunset from 6:23 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:266:23
212.95:276:22
312.95:286:20
412.85:296:18
512.85:306:16
612.75:316:15
712.75:326:13
812.65:336:11
912.65:346:10
1012.55:356:08
1112.55:366:06
1212.55:376:04
1312.45:386:03
1412.45:396:01
1512.35:405:59
1612.35:415:57
1712.25:425:55
1812.25:435:54
1912.15:445:52
2012.15:455:50
2112.05:465:48
2212.05:475:47
2311.95:485:45
2411.95:495:43
2511.85:505:41
2611.85:515:40
2711.85:535:38
2811.75:545:36
2911.75:555:34
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 4.19 kWh/m².

For context, solar energy here swings from a low near 1.72 kWh/m² to a high of 5.98 kWh/m² in June across the year — September's 4.19 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
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
174.2Bright
184.1Bright
194.1Bright
204.0Bright
214.0Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Harrison

In seasonPeak

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

Harrison 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 Harrison?

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

7.0
Sightseeing
1st-best month of the year
5.5
Beach & pool
4th-best month of the year

September is one of the better times to visit Harrison for general sightseeing.

What to pack for Harrison in September

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

In September, Harrison sees daytime highs around 74°F and nights near 61°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Harrison 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 21 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 Harrison 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 Harrison 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 Harrison 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 Harrison 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 Harrison?

Harrison sits at 41.0°N, 73.7°W, 69 ft above sea level, in United States. The nearest listed city is Rye, 1.9 mi away.

Topography around Harrison

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

Within 2 miles, the terrain around Harrison has only modest variations in elevation — a maximum elevation change of 230 ft around an average of 85 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 623 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,909 ft.

The land around Harrison is covered by trees (68%) within 2 miles, trees (47%) and water (34%) within 10 miles, and trees (53%) and water (31%) within 50 miles.

2 miles
230 ft
10 miles
623 ft
50 miles
1,909 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Rye 1.9 mi · Mamaroneck 1.9 mi · Port Chester 3.1 mi · Scarsdale 4.3 mi · Eastchester 5.0 mi · White Plains 5.0 mi · New Rochelle 5.6 mi · Mount Vernon 7.5 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 Harrison (40.969°, -73.7126°, elevation 69 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).