Chicopee weather in September

In September, Chicopee sees average daytime highs of 73°F and overnight lows near 55°F, with 3.7 in of rain across 8.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 77°F in the first days to 68°F by the end. The sky is clear or mostly clear about 37% 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 Chicopee's 1st-clearest and 9th-windiest month. For the whole year in context, see Chicopee's year-round climate.

Daytime high
73°
4th warmest
Overnight low
55°
9th coldest
Rainfall
3.7 in
8.3 wet days
Daylight
12 h 18 min
5:36 AM – 5:53 PM
Cloud cover
55%
1st clearest
Wind
6 mph
9th windiest
Solar energy
4.15 kWh/m²
Travel score
7.0
out of 10

Chicopee is city in Hampden County, Massachusetts, United States.

Density
918/km²
people per km²
Founded
1640

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 77°F in the first days to 68°F by the end.

A typical September day in Chicopee reaches about 73°F in the afternoon and slips back to 55°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 82°F. Set against its neighbours, September runs about 8°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17860
27859
37759
47759
57758
67658
77658
87658
97557
107557
117556
127456
137456
147355
157355
167355
177254
187254
197254
207153
217153
227153
237052
247052
256951
266951
276951
286850
296850
306750

How September really feels in Chicopee

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.

Chicopee weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan34° / 19°3.39.66.39.30.0
Feb37° / 21°3.08.75.810.30.0
Mar45° / 29°4.010.34.811.61.0
Apr57° / 39°3.610.71.213.14.0
May68° / 49°3.210.6014.46.1
Jun77° / 58°3.510.80156.6
Jul82° / 64°3.39.9014.86.2
Aug80° / 62°3.38.7013.76.7
Sep73° / 55°3.78.3012.37.0
Oct61° / 44°4.29.10.210.85.1
Nov49° / 34°3.39.11.29.62.1
Dec39° / 26°4.110.1590.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25347
35248
45248
55149
65248
75248
85248
95347
105347
115347
125347
135446
145446
155347
165446
175446
185347
195347
205248
215248
225248
235149
245149
255149
265149
275149
285050
295050
304951

Chance of precipitation in September

Any precipitation

Chicopee gets around 3.7 in of rain over 8.3 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
123
224
324
424
525
625
726
826
926
1027
1127
1227
1327
1427
1527
1627
1727
1827
1927
2027
2128
2228
2328
2428
2529
2629
2729
2829
2929
3029

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 52% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1352621143
2362621143
3372621143
4382521133
5392521133
6402520133
7412420122
8422420122
9432419122
10442319122
11452319112
12472218111
13482218111
14512117101
15512117101
16522017101
1754201691
1854201691
1957191581
2058191580
2159181580
2261181470
2362171470
2464171360
2565161360
2667161250
2767161250
2870151140
2970151140
3072141040

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:20 AM to 5:52 AM, and sunset from 6:20 PM to 5:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:206:20
213.05:216:18
312.95:226:17
412.95:236:15
512.85:246:13
612.85:266:11
712.75:276:09
812.75:286:08
912.65:296:06
1012.65:306:04
1112.55:316:02
1212.55:326:00
1312.45:335:59
1412.45:345:57
1512.35:355:55
1612.35:365:53
1712.25:375:51
1812.25:395:49
1912.15:405:48
2012.15:415:46
2112.05:425:44
2212.05:435:42
2311.95:445:40
2411.95:455:39
2511.85:465:37
2611.85:475:35
2711.75:485:33
2811.75:505:31
2911.65:515:29
3011.65:525:28

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 1.62 kWh/m² to a high of 5.9 kWh/m² in July 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
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Chicopee?

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
5.2
Beach & pool
4th-best month of the year

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

What to pack for Chicopee in September

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

In September, Chicopee sees daytime highs around 73°F and nights near 55°F. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

UV index in Chicopee 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 Chicopee 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 January 1 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 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May8Very high
Jun7Very high
Jul8Very high
Aug5High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Chicopee 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 Chicopee is worst in July — around 15 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1615 µg/m³Nov 197 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar12Good
Apr12Good
May13Moderate
Jun14Moderate
Jul15Moderate
Aug13Moderate
Sep11Good
Oct9Good
Nov7Good
Dec8Good
Location & terrain

Where is Chicopee?

Chicopee sits at 42.1°N, 72.6°W, 85 ft above sea level, in United States. The nearest listed city is North Chicopee, 2.5 mi away.

Topography around Chicopee

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

Within 2 miles, the terrain around Chicopee has only modest variations in elevation — a maximum elevation change of 282 ft around an average of 148 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,145 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,465 ft.

The land around Chicopee is covered by trees (48%) and artificial surfaces (33%) within 2 miles, trees (69%) within 10 miles, and trees (90%) within 50 miles.

2 miles
282 ft
10 miles
1,145 ft
50 miles
3,465 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: North Chicopee 2.5 mi · West Springfield 3.1 mi · Springfield 3.1 mi · Holyoke 3.7 mi · Agawam 5.6 mi · Ludlow 6.8 mi · Longmeadow 6.8 mi · Westfield 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 Chicopee (42.1487°, -72.6079°, elevation 85 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. 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).