Leominster weather in September

In September, Leominster sees average daytime highs of 72°F and overnight lows near 54°F, with 3.7 in of rain across 8.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 76°F in the first days to 67°F by the end. The sky is clear or mostly clear about 38% 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 Leominster's 1st-clearest and 9th-windiest month. For the whole year in context, see Leominster's year-round climate.

Daytime high
72°
4th warmest
Overnight low
54°
9th coldest
Rainfall
3.7 in
8.5 wet days
Daylight
12 h 18 min
5:33 AM – 5:50 PM
Cloud cover
56%
1st clearest
Wind
7 mph
9th windiest
Solar energy
4.13 kWh/m²
Travel score
6.9
out of 10

Leominster is city in Worcester County, Massachusetts, United States.

Density
541/km²
people per km²
Founded
1653

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 76°F in the first days to 67°F by the end.

A typical September day in Leominster reaches about 72°F in the afternoon and slips back to 54°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 62°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)
17759
27759
37658
47658
57658
67557
77557
87557
97456
107456
117456
127355
137355
147355
157255
167254
177154
187153
197153
207053
217052
227052
236952
246951
256851
266851
276750
286750
296749
306649

How September really feels in Leominster

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.

Leominster weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan33° / 19°3.49.86.69.20.0
Feb36° / 20°3.18.7610.30.0
Mar44° / 28°4.211.15.711.60.7
Apr56° / 38°3.811.31.613.13.6
May67° / 48°3.411.30.114.45.8
Jun76° / 58°4.011.7015.16.4
Jul82° / 64°3.810.9014.86.2
Aug80° / 62°3.810.4013.76.6
Sep72° / 54°3.78.5012.36.9
Oct60° / 44°3.99.80.410.84.9
Nov48° / 34°3.59.51.49.61.9
Dec38° / 25°4.310.45.88.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% 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 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55248
65248
75248
85248
95248
105347
115347
125347
135446
145446
155347
165446
175446
185347
195347
205347
215248
225248
235248
245248
255149
265149
275149
285248
295248
305248

Chance of precipitation in September

Any precipitation

Leominster gets around 3.7 in of rain over 8.5 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 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
126
227
327
427
528
628
729
829
929
1029
1129
1229
1329
1429
1528
1628
1728
1828
1928
2027
2127
2227
2327
2428
2528
2628
2729
2829
2929
3030

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 9% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1392718132
2402718132
3412618132
4422617122
5442617122
6452517121
7462517111
8472417111
9482417111
10492316111
11502316101
12512216101
13532116100
1455201690
1556201590
1658191580
1759181580
1860181480
1961181470
2062171470
2163171370
2265161360
2366161260
2467161250
2569151150
2670151140
2771151040
287215940
297414930
307514830

Wind in September

Winds average 7 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
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
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 5:16 AM to 5:49 AM, and sunset from 6:17 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:166:17
213.05:176:15
312.95:196:14
412.95:206:12
512.85:216:10
612.85:226:08
712.75:236:06
812.75:246:05
912.65:256:03
1012.65:266:01
1112.55:275:59
1212.55:285:57
1312.45:305:55
1412.45:315:54
1512.35:325:52
1612.35:335:50
1712.25:345:48
1812.25:355:46
1912.15:365:44
2012.15:375:42
2112.05:385:41
2212.05:405:39
2311.95:415:37
2411.95:425:35
2511.85:435:33
2611.85:445:31
2711.75:455:30
2811.75:465:28
2911.65:475:26
3011.65:495:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.13 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 5.89 kWh/m² in July across the year — September's 4.13 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
134.2Bright
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 Leominster?

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

6.9
Sightseeing
1st-best month of the year
4.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Leominster for sightseeing.

What to pack for Leominster in September

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

In September, Leominster sees daytime highs around 72°F and nights near 54°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Leominster 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 Leominster peaks around July 10 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 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 10UV 7Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun7Very high
Jul7Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Leominster?

Leominster sits at 42.5°N, 71.8°W, 404 ft above sea level, in United States. The nearest listed city is Fitchburg, 4.3 mi away.

Topography around Leominster

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

Within 2 miles, the terrain around Leominster has significant variations in elevation — a maximum elevation change of 853 ft around an average of 482 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,798 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,176 ft.

The land around Leominster is covered by trees (66%) and artificial surfaces (24%) within 2 miles, trees (82%) within 10 miles, and trees (87%) within 50 miles.

2 miles
853 ft
10 miles
1,798 ft
50 miles
3,176 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Fitchburg 4.3 mi · Gardner 12 mi · Holden 13 mi · Shrewsbury 16 mi · Marlborough 16 mi · Westford 17 mi · Acton 17 mi · Worcester 18 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 Leominster (42.5251°, -71.7598°, elevation 404 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).