Southbridge weather in September

In September, Southbridge sees average daytime highs of 72°F and overnight lows near 55°F, with 4.0 in of rain across 9.1 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 76°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 Southbridge's 1st-clearest and 10th-windiest month. For the whole year in context, see Southbridge's year-round climate.

Daytime high
72°
4th warmest
Overnight low
55°
9th coldest
Rainfall
4.0 in
9.1 wet days
Daylight
12 h 18 min
5:34 AM – 5:51 PM
Cloud cover
55%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.14 kWh/m²
Travel score
6.9
out of 10

Southbridge is city in Worcester County, Massachusetts, USA.

Density
351/km²
people per km²
Founded
1730

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 68°F by the end.

A typical September day in Southbridge reaches about 72°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 63°F and 82°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17759
27759
37659
47658
57658
67658
77558
87557
97557
107456
117456
127456
137356
147355
157355
167255
177254
187254
197153
207153
217153
227053
237052
246952
256951
266951
276851
286850
296750
306750

How September really feels in Southbridge

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.

Southbridge 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
Jan34° / 20°3.49.76.29.30.0
Feb37° / 21°3.18.65.410.30.0
Mar45° / 29°4.210.54.811.70.9
Apr57° / 39°3.711.51.213.13.8
May67° / 49°3.411.3014.45.9
Jun76° / 58°4.211.80156.4
Jul82° / 64°4.011.1014.76.2
Aug80° / 62°4.410.5013.76.5
Sep72° / 55°4.09.1012.36.9
Oct61° / 44°4.29.90.310.85.0
Nov49° / 34°3.59.11.19.62.1
Dec39° / 26°4.310.75.190.1

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 (%)
15248
25248
35347
45248
55248
65347
75347
85347
95347
105347
115347
125347
135347
145347
155347
165347
175248
185248
195248
205149
215050
225050
235050
245050
255149
265050
275050
285050
295050
305248

Chance of precipitation in September

Any precipitation

Southbridge gets around 4.0 in of rain over 9.1 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 30% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
329
429
529
630
730
830
931
1031
1131
1231
1330
1430
1530
1630
1729
1829
1929
2029
2129
2229
2330
2430
2530
2631
2731
2831
2932
3032

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 53% 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 (%)
1362720143
2372619143
3382619143
4392519133
5402519133
6412519133
7422419123
8432419122
9442318122
10462318122
11472218112
12482218112
13492118101
14512018101
15522017101
1654191791
1754191791
1856181691
1958181680
2059181580
2161171570
2261171570
2362171470
2465161360
2565161360
2667161250
2768151250
2869151150
2970151140
3071151040

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
57calm
67calm
77calm
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 5:18 AM to 5:49 AM, and sunset from 6:18 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:186:18
212.95:196:16
312.95:206:14
412.95:216:12
512.85:226:11
612.85:236:09
712.75:246:07
812.75:256:05
912.65:276:04
1012.65:286:02
1112.55:296:00
1212.55:305:58
1312.45:315:56
1412.45:325:54
1512.35:335:53
1612.35:345:51
1712.25:355:49
1812.25:365:47
1912.15:375:45
2012.15:385:44
2112.05:405:42
2212.05:415:40
2311.95:425:38
2411.95:435:36
2511.85:445:34
2611.85:455:33
2711.75:465:31
2811.75:475:29
2911.65:485:27
3011.65:495:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.14 kWh/m².

For context, solar energy here swings from a low near 1.64 kWh/m² to a high of 5.88 kWh/m² in June across the year — September's 4.14 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.4Bright
114.3Bright
124.3Bright
134.3Bright
144.2Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Moderate
214.0Moderate
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 Southbridge?

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
4.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Southbridge for sightseeing.

What to pack for Southbridge in September

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

In September, Southbridge sees daytime highs around 72°F and nights near 55°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Southbridge 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 Southbridge 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
Apr6High
May8Very high
Jun7Very high
Jul8Very high
Aug5High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Southbridge?

Southbridge sits at 42.1°N, 72.0°W, 492 ft above sea level, in United States. The nearest listed city is Auburn, 13 mi away.

Topography around Southbridge

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

Within 2 miles, the terrain around Southbridge has only modest variations in elevation — a maximum elevation change of 469 ft around an average of 617 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,043 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,024 ft.

The land around Southbridge is covered by trees (80%) within 2 miles, trees (87%) within 10 miles, and trees (88%) within 50 miles.

2 miles
469 ft
10 miles
1,043 ft
50 miles
2,024 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Auburn 13 mi · Palmer 16 mi · Worcester 17 mi · Killingly Center 19 mi · Grafton 20 mi · Holden 21 mi · Storrs 22 mi · Shrewsbury 22 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 Southbridge (42.0751°, -72.0334°, elevation 492 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).