Jamestown weather in September

In September, Jamestown sees average daytime highs of 69°F and overnight lows near 51°F, with 3.8 in of rain across 11 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 9th-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 29% 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 Jamestown's 3rd-clearest and 9th-windiest month. For the whole year in context, see Jamestown's year-round climate.

Daytime high
69°
4th warmest
Overnight low
51°
9th coldest
Rainfall
3.8 in
11 wet days
Daylight
12 h 18 min
6:03 AM – 6:20 PM
Cloud cover
59%
3rd clearest
Wind
6 mph
9th windiest
Solar energy
4.12 kWh/m²
Travel score
6.2
out of 10

Jamestown is city in Chautauqua County, New York, United States.

Density
1,281/km²
people per km²
Founded
1810

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 Jamestown reaches about 69°F in the afternoon and slips back to 51°F overnight — a 17°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 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17356
27356
37356
47355
57255
67255
77255
87154
97154
107154
117153
127053
137053
146952
156952
166951
176951
186851
196850
206750
216750
226749
236649
246649
256648
266548
276547
286447
296447
306447

How September really feels in Jamestown

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.

Jamestown weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan31° / 17°3.715.313.99.30.0
Feb33° / 18°2.91210.410.30.0
Mar42° / 25°3.713.67.711.70.5
Apr55° / 37°4.614.13.313.13.2
May65° / 47°4.714.80.114.45.2
Jun73° / 56°5.014.40156.0
Jul77° / 60°4.514.4014.86.2
Aug75° / 58°4.313.2013.76.5
Sep69° / 51°3.811012.36.2
Oct57° / 41°4.113.61.110.83.8
Nov45° / 32°3.813.96.79.61.0
Dec35° / 23°3.915.512.590.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25248
35248
45149
55149
65050
75050
84951
94753
104753
114753
124753
134555
144555
154555
164555
174555
184654
194654
204654
214753
224654
234753
244753
254753
264753
274753
284654
294654
304753

Chance of precipitation in September

Any precipitation

Jamestown gets around 3.8 in of rain over 11 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 37% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
336
436
536
636
736
836
936
1037
1136
1236
1336
1436
1536
1636
1735
1835
1935
2035
2136
2236
2337
2437
2538
2639
2739
2840
2940
3041

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 56% 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 (%)
1342825122
2352824122
3362823112
4382722112
5392721102
6412720102
7422720102
844271991
945271891
1047261881
1148261771
1250251771
1351251761
1452251661
1554241651
1656241550
1758231540
1860221440
1962211430
2063201430
2164191430
2266191320
2367181320
2470171210
2572161110
2672161110
2774151010
2874151010
297614910
307614910

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
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 5:47 AM to 6:18 AM, and sunset from 6:47 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:476:47
212.95:486:45
312.95:496:43
412.95:506:41
512.85:516:40
612.85:526:38
712.75:536:36
812.75:546:34
912.65:556:32
1012.65:566:31
1112.55:576:29
1212.55:596:27
1312.46:006:25
1412.46:016:23
1512.36:026:21
1612.36:036:20
1712.26:046:18
1812.26:056:16
1912.16:066:14
2012.16:076:12
2112.06:086:11
2212.06:096:09
2311.96:116:07
2411.96:126:05
2511.86:136:03
2611.86:146:01
2711.76:156:00
2811.76:165:58
2911.66:175:56
3011.66:185:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.12 kWh/m².

For context, solar energy here swings from a low near 1.31 kWh/m² to a high of 6.11 kWh/m² in June across the year — September's 4.12 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.0Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Jamestown?

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

6.2
Sightseeing
2nd-best month of the year
3.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Jamestown for sightseeing.

What to pack for Jamestown in September

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

In September, Jamestown sees daytime highs around 69°F and nights near 51°F. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Jamestown in September

The nearest coast averages about 70°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 73°F and coldest in February near 34°F.

It's comfortable for a long swim from Jul 6 to Sep 21 — about 2.6 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan37Bracing
Feb34Bracing
Mar34Bracing
Apr38Bracing
May48Bracing
Jun62Cool
Jul71Refreshing
Aug73Refreshing
Sep70Refreshing
Oct60Cool
Nov51Bracing
Dec44Bracing

UV index in Jamestown 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 Jamestown peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 23UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Jamestown?

Jamestown sits at 42.1°N, 79.2°W, 1,378 ft above sea level, in United States. The nearest listed city is Erie, 43 mi away.

Topography around Jamestown

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

Within 2 miles, the terrain around Jamestown has only modest variations in elevation — a maximum elevation change of 390 ft around an average of 1,437 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,030 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,900 ft.

The land around Jamestown is covered by trees (58%), grassland (21%) and artificial surfaces (20%) within 2 miles, trees (68%) and grassland (23%) within 10 miles, and trees (68%) within 50 miles.

2 miles
390 ft
10 miles
1,030 ft
50 miles
1,900 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Erie 43 mi · Lackawanna 55 mi · Port Colborne 55 mi · West Seneca 57 mi · Buffalo 58 mi · Fort Erie 58 mi · Cheektowaga 61 mi · Welland 62 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 Jamestown (42.097°, -79.2353°, elevation 1,378 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. 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).