Erie weather in September

In September, Erie sees average daytime highs of 69°F and overnight lows near 62°F, with 4.2 in of rain across 11.1 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 65°F by the end. The sky is clear or mostly clear about 40% 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 Erie's 3rd-clearest and 8th-windiest month. For the whole year in context, see Erie's year-round climate.

Daytime high
69°
4th warmest
Overnight low
62°
9th coldest
Rainfall
4.2 in
11.1 wet days
Daylight
12 h 18 min
6:06 AM – 6:23 PM
Cloud cover
52%
3rd clearest
Wind
11 mph
8th windiest
Solar energy
4.35 kWh/m²
Travel score
6.3
out of 10

Erie is city on the south shore of Lake Erie and the county seat of Erie County, Pennsylvania, United States.

Density
1,992/km²
people per km²
Founded
1795

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 65°F by the end.

A typical September day in Erie reaches about 69°F in the afternoon and slips back to 62°F overnight — a 7°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 77°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17366
27366
37366
47365
57265
67265
77265
87164
97164
107164
117163
127063
137063
147062
156962
166962
176961
186861
196861
206860
216760
226759
236759
246659
256658
266558
276558
286557
296457
306456

How September really feels in Erie

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.

Erie 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
Jan32° / 24°4.416.613.39.30.0
Feb32° / 22°3.011.98.910.30.0
Mar37° / 28°3.712.2611.60.0
Apr47° / 39°4.313.1213.11.3
May59° / 51°3.912.6014.44.3
Jun71° / 64°4.513.10156.3
Jul76° / 69°4.813.5014.86.6
Aug75° / 68°4.412.6013.76.8
Sep69° / 62°4.211.1012.36.3
Oct58° / 51°4.914.50.110.83.9
Nov47° / 40°4.915.54.49.61.2
Dec38° / 31°5.117.811.290.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16337
26139
36139
46139
56139
66040
76040
85941
95941
105941
115842
125842
135842
145743
155743
165743
175644
185644
195644
205644
215545
225446
235446
245446
255347
265347
275446
285446
295347
305347

Chance of precipitation in September

Any precipitation

Erie gets around 4.2 in of rain over 11.1 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 38% and peaks near 43% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
436
536
636
737
837
937
1037
1137
1237
1337
1437
1537
1637
1736
1836
1936
2036
2137
2237
2338
2438
2539
2640
2741
2842
2943
3043

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 38% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1162528255
2172528245
3192527245
4202627234
5212626224
6232626214
7242626203
8262625193
9272625193
10292625182
11302625172
12322624172
13342524161
14352524151
15372523141
16382523131
17402522130
18412521120
19432521110
20442520110
21462519100
2248251890
2349251780
2451251680
2553251570
2654251560
2755251460
2858241350
2959241250
3060231250

Wind in September

Winds average 11 mph in September.

Across September, daily wind ranges from about 10 mph on the calmest days to 12 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1111light breeze
1211light breeze
1311light breeze
1411light breeze
1511light breeze
1611light breeze
1711light breeze
1811light breeze
1911light breeze
2011light breeze
2111light breeze
2211light breeze
2311light breeze
2411light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light 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 5:50 AM to 6:22 AM, and sunset from 6:50 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:506:50
213.05:516:48
312.95:526:46
412.95:536:45
512.85:546:43
612.85:556:41
712.75:576:39
812.75:586:38
912.65:596:36
1012.66:006:34
1112.56:016:32
1212.56:026:30
1312.46:036:29
1412.46:046:27
1512.36:056:25
1612.36:066:23
1712.26:076:21
1812.26:086:19
1912.16:106:18
2012.16:116:16
2112.06:126:14
2212.06:136:12
2311.96:146:10
2411.96:156:08
2511.86:166:07
2611.86:176:05
2711.76:186:03
2811.76:196:01
2911.66:215:59
3011.66:225:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.35 kWh/m².

For context, solar energy here swings from a low near 1.26 kWh/m² to a high of 6.54 kWh/m² in June across the year — September's 4.35 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.3Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.0Bright
244.0Moderate
253.9Moderate
263.9Moderate
273.8Moderate
283.8Moderate
293.7Moderate
303.7Moderate
Planning a trip in September

Is September a good time to visit Erie?

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

6.3
Sightseeing
3rd-best month of the year
3.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Erie for sightseeing.

What to pack for Erie in September

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

In September, Erie sees daytime highs around 69°F and nights near 62°F. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Erie 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 15 mi away) is warmest in August at about 74°F and coldest in February near 33°F.

It's comfortable for a long swim from Jul 4 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
Jan36Bracing
Feb33Bracing
Mar34Bracing
Apr39Bracing
May49Bracing
Jun63Cool
Jul72Refreshing
Aug74Refreshing
Sep70Refreshing
Oct61Cool
Nov51Bracing
Dec43Bracing

UV index in Erie 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 Erie peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 20UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Erie?

Erie sits at 42.1°N, 80.1°W, 653 ft above sea level, in United States. The nearest listed city is Ashtabula, 40 mi away.

Topography around Erie

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

Within 2 miles, the terrain around Erie has only modest variations in elevation — a maximum elevation change of 276 ft around an average of 650 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 981 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,611 ft.

The land around Erie is covered by artificial surfaces (47%) and water (29%) within 2 miles, water (45%) and trees (33%) within 10 miles, and water (44%) and trees (41%) within 50 miles.

2 miles
276 ft
10 miles
981 ft
50 miles
1,611 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ashtabula 40 mi · Jamestown 43 mi · Norfolk County 51 mi · Tillsonburg 60 mi · Hermitage 65 mi · Painesville 66 mi · Port Colborne 69 mi · Brantford 70 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 Erie (42.1292°, -80.0851°, elevation 653 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).