Plattsburgh weather in September

In September, Plattsburgh sees average daytime highs of 69°F and overnight lows near 53°F, with 3.7 in of rain across 9.8 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 73°F in the first days to 64°F by the end. The sky is clear or mostly clear about 31% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Plattsburgh's 2nd-clearest and 9th-windiest month. For the whole year in context, see Plattsburgh's year-round climate.

Daytime high
69°
4th warmest
Overnight low
53°
9th coldest
Rainfall
3.7 in
9.8 wet days
Daylight
12 h 18 min
5:39 AM – 5:57 PM
Cloud cover
57%
2nd clearest
Wind
6 mph
9th windiest
Solar energy
3.91 kWh/m²
Travel score
6.4
out of 10

Plattsburgh is city in and county seat of Clinton County, New York, United States.

Density
1,163/km²
people per km²
Founded
1785

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 73°F in the first days to 64°F by the end.

A typical September day in Plattsburgh reaches about 69°F in the afternoon and slips back to 53°F overnight — a 16°F spread between the day's warmth and the night's chill. On most days the high lands between 59°F and 79°F. Set against its neighbours, September runs about 8°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17457
27457
37357
47356
57356
67356
77255
87255
97155
107155
117154
127054
137053
147053
156953
166953
176952
186852
196851
206751
216751
226751
236650
246650
256549
266549
276449
286448
296348
306348

How September really feels in Plattsburgh

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.

Plattsburgh 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
Jan26° / 12°2.59.88.790.0
Feb28° / 12°2.28.57.910.10.0
Mar37° / 22°2.911.16.711.60.1
Apr52° / 35°3.711.62.613.22.6
May65° / 46°4.0120.114.65.5
Jun74° / 55°4.412.3015.36.3
Jul78° / 62°4.212.80156.3
Aug76° / 60°4.212.6013.96.6
Sep69° / 53°3.79.8012.36.4
Oct56° / 42°4.312.40.510.73.5
Nov43° / 32°3.211.73.49.40.7
Dec33° / 22°3.011.68.88.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15644
25545
35545
45446
55446
65347
75347
85248
95248
105248
115248
125248
135149
145149
155149
165050
175050
185050
195050
204951
214951
224852
234753
244753
254753
264555
274555
284555
294456
304456

Chance of precipitation in September

Any precipitation

Plattsburgh gets around 3.7 in of rain over 9.8 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 34% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
232
332
432
532
632
732
832
933
1033
1133
1233
1333
1433
1533
1633
1733
1833
1933
2033
2133
2234
2334
2435
2535
2636
2737
2837
2938
3038

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 57% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1352923131
2362922121
3382921121
4392920111
5412919101
6422918101
744291891
845291780
946281780
1048281770
1150271670
1251271660
1353261560
1454251560
1557241450
1657241450
1759231350
1861221340
1962211340
2064201240
2165191240
2268181130
2369171130
2471161030
2572151030
267514920
277713820
287812820
297912720
308211610

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
266calm
276calm
286calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min 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 90 minutes over September. Sunrise moves from 5:21 AM to 5:56 AM, and sunset from 6:26 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:216:26
213.05:226:24
313.05:236:23
412.95:246:21
512.95:266:19
612.85:276:17
712.85:286:15
812.75:296:13
912.75:306:11
1012.65:326:09
1112.65:336:07
1212.55:346:05
1312.55:356:03
1412.45:376:01
1512.45:385:59
1612.35:395:57
1712.35:405:55
1812.25:415:53
1912.15:435:51
2012.15:445:49
2112.05:455:47
2212.05:465:46
2311.95:485:44
2411.95:495:42
2511.85:505:40
2611.85:515:38
2711.75:535:36
2811.75:545:34
2911.65:555:32
3011.65:565:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.91 kWh/m².

For context, solar energy here swings from a low near 1.17 kWh/m² to a high of 5.87 kWh/m² in July across the year — September's 3.91 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.2Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.0Bright
144.0Moderate
153.9Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.8Moderate
203.7Moderate
213.6Moderate
223.6Moderate
233.5Moderate
243.5Moderate
253.4Moderate
263.4Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Hazard calendar for Plattsburgh

In seasonPeak

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

Plattsburgh 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 Plattsburgh?

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

6.4
Sightseeing
2nd-best month of the year
3.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Plattsburgh for sightseeing.

What to pack for Plattsburgh in September

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

In September, Plattsburgh sees daytime highs around 69°F and nights near 53°F. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Plattsburgh in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Plattsburgh peaks around July 13 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateModerateLowJul 13UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5Moderate
May7High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Plattsburgh?

Plattsburgh sits at 44.7°N, 73.5°W, 138 ft above sea level, in United States. The nearest listed city is Colchester, 19 mi away.

Topography around Plattsburgh

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

Within 2 miles, the terrain around Plattsburgh has only modest variations in elevation — a maximum elevation change of 272 ft around an average of 151 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,457 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,325 ft.

The land around Plattsburgh is covered by water (34%), trees (26%) and artificial surfaces (22%) within 2 miles, trees (45%) and water (28%) within 10 miles, and trees (69%) within 50 miles.

2 miles
272 ft
10 miles
1,457 ft
50 miles
5,325 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Colchester 19 mi · Burlington 19 mi · South Burlington 21 mi · Saint-Jean-sur-Richelieu 43 mi · Saint-Constant 47 mi · Candiac 47 mi · Sainte-Catherine 49 mi · Châteauguay 50 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 Plattsburgh (44.6995°, -73.4529°, elevation 138 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). UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).