Buffalo weather in September

In September, Buffalo sees average daytime highs of 70°F and overnight lows near 58°F, with 3.4 in of rain across 10.4 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 74°F in the first days to 65°F by the end. The sky is clear or mostly clear about 34% 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 Buffalo's 3rd-clearest and 9th-windiest month. For the whole year in context, see Buffalo's year-round climate.

Daytime high
70°
4th warmest
Overnight low
58°
9th coldest
Rainfall
3.4 in
10.4 wet days
Daylight
12 h 18 min
6:01 AM – 6:18 PM
Cloud cover
55%
3rd clearest
Wind
8 mph
9th windiest
Solar energy
4.15 kWh/m²
Travel score
6.5
out of 10

Buffalo is city and county seat of Erie County, New York, United States.

Density
1,898/km²
people per km²
Founded
1832

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 74°F in the first days to 65°F by the end.

A typical September day in Buffalo reaches about 70°F in the afternoon and slips back to 58°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 78°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17462
27462
37462
47462
57361
67361
77361
87260
97260
107260
117159
127159
137159
147158
157058
167058
177057
186957
196956
206956
216856
226855
236755
246755
256754
266654
276654
286553
296553
306453

How September really feels in Buffalo

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.

Buffalo 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
Jan31° / 21°2.912.5109.20.0
Feb32° / 21°2.310.27.910.20.0
Mar40° / 28°2.911.45.611.60.2
Apr51° / 39°3.712.21.913.12.5
May64° / 50°3.412.4014.45.2
Jun73° / 61°3.912.3015.16.5
Jul78° / 66°4.012.6014.86.5
Aug76° / 65°3.411013.86.8
Sep70° / 58°3.410.4012.36.5
Oct58° / 47°3.712.60.110.84.0
Nov46° / 37°3.111.83.19.51.3
Dec37° / 28°3.112.87.48.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 47%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25842
35842
45743
55743
65743
75644
85545
95446
105446
115347
125347
135347
145248
155248
165248
175248
185248
195248
205149
215149
225149
235050
245050
255050
264951
274852
284753
294753
304753

Chance of precipitation in September

Any precipitation

Buffalo gets around 3.4 in of rain over 10.4 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 35% and peaks near 39% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
232
332
433
533
634
734
834
935
1035
1135
1234
1334
1434
1534
1633
1733
1833
1933
2033
2134
2234
2335
2436
2536
2637
2738
2839
2939
3039

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 45% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1222827203
2232826193
3252826183
4262825183
5282824173
6292824162
7312824152
8322823142
9342823142
10352823131
11372723121
12392722111
13402722101
14422621100
1544262190
1645262080
1747262070
1849251970
1951251860
2051251860
2154241750
2255241650
2358231540
2459231440
2562221330
2663221230
2764221130
2866211120
2968201020
307019920

Wind in September

Winds average 8 mph in September.

Across September, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze

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 5:44 AM to 6:17 AM, and sunset from 6:46 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:446:46
213.05:466:44
312.95:476:42
412.95:486:41
512.85:496:39
612.85:506:37
712.75:516:35
812.75:526:33
912.65:536:31
1012.65:556:30
1112.55:566:28
1212.55:576:26
1312.45:586:24
1412.45:596:22
1512.36:006:20
1612.36:016:18
1712.26:026:17
1812.26:036:15
1912.16:056:13
2012.16:066:11
2112.06:076:09
2212.06:086:07
2311.96:096:05
2411.96:106:04
2511.86:116:02
2611.86:136:00
2711.76:145:58
2811.76:155:56
2911.66:165:54
3011.66:175:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 1.28 kWh/m² to a high of 6.33 kWh/m² in June across the year — September's 4.15 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.3Bright
124.3Bright
134.3Bright
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 Buffalo?

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

6.5
Sightseeing
2nd-best month of the year
4.0
Beach & pool
4th-best month of the year

September is a reasonable time to visit Buffalo for sightseeing.

What to pack for Buffalo in September

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

In September, Buffalo sees daytime highs around 70°F and nights near 58°F. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Buffalo in September

The nearest coast averages about 69°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 34°F.

It's comfortable for a long swim from Jul 4 to Sep 20 — 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
Jul72Refreshing
Aug74Refreshing
Sep69Refreshing
Oct60Cool
Nov50Bracing
Dec43Bracing

UV index in Buffalo 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 Buffalo peaks around June 22 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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 highHighModerateLowJun 22UV 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Buffalo?

Buffalo sits at 42.9°N, 78.9°W, 600 ft above sea level, in United States. The nearest listed city is Fort Erie, 3.1 mi away.

Topography around Buffalo

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

Within 2 miles, the terrain around Buffalo has only modest variations in elevation — a maximum elevation change of 164 ft around an average of 597 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 407 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,208 ft.

The land around Buffalo is covered by artificial surfaces (46%) and water (31%) within 2 miles, water (28%), artificial surfaces (27%) and trees (26%) within 10 miles, and trees (39%) and water (31%) within 50 miles.

2 miles
164 ft
10 miles
407 ft
50 miles
2,208 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Fort Erie 3.1 mi · West Seneca 5.0 mi · Lackawanna 5.0 mi · Kenmore 5.6 mi · Cheektowaga 6.2 mi · Eggertsville 6.2 mi · Amherst 7.5 mi · Depew 9.3 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 Buffalo (42.8865°, -78.8784°, elevation 600 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).