Smithfield weather in September

In September, Smithfield sees average daytime highs of 73°F and overnight lows near 56°F, with 3.5 in of rain across 8.4 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 77°F in the first days to 69°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 Smithfield's 2nd-clearest and 10th-windiest month. For the whole year in context, see Smithfield's year-round climate.

Daytime high
73°
4th warmest
Overnight low
56°
9th coldest
Rainfall
3.5 in
8.4 wet days
Daylight
12 h 18 min
5:32 AM – 5:49 PM
Cloud cover
55%
2nd clearest
Wind
7 mph
10th windiest
Solar energy
4.13 kWh/m²
Travel score
7.0
out of 10

Smithfield is town in Providence County, Rhode Island, United States.

Founded
1731

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 69°F by the end.

A typical September day in Smithfield reaches about 73°F in the afternoon and slips back to 56°F overnight — a 17°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 7°F cooler than August and about 11°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17860
27760
37760
47759
57659
67659
77658
87658
97558
107558
117557
127457
137457
147456
157356
167356
177355
187255
197255
207254
217154
227154
237153
247053
257053
266952
276952
286952
296851
306851

How September really feels in Smithfield

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.

Smithfield 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
Jan36° / 22°3.49.85.79.30.0
Feb38° / 23°3.18.4510.30.0
Mar46° / 30°4.310.74.511.71.2
Apr57° / 40°3.710.7113.14.0
May67° / 49°3.110.7014.36.0
Jun77° / 59°3.610.70156.6
Jul82° / 65°3.310.6014.76.0
Aug80° / 63°3.810.4013.76.5
Sep73° / 56°3.58.4012.37.0
Oct62° / 45°3.99.50.210.95.3
Nov51° / 35°3.58.90.99.62.5
Dec41° / 28°4.210.34.690.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25248
35248
45248
55149
65149
75149
85149
95149
105149
115149
125248
135248
145248
155248
165248
175149
185149
195149
205050
215050
225050
235050
245050
255149
265050
275050
285149
295149
305248

Chance of precipitation in September

Any precipitation

Smithfield gets around 3.5 in of rain over 8.4 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 28% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
227
327
427
527
628
728
828
928
1028
1128
1228
1328
1428
1527
1627
1727
1827
1927
2027
2128
2228
2328
2429
2529
2629
2730
2830
2930
3031

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 49% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1312820165
2322720155
3332720155
4342719155
5352619145
6372619144
7382519144
8392519144
9402419134
10412319133
11432319133
12442219133
13452218122
14472118122
15482117122
16492117111
17512017111
18522016111
19522016111
20541915111
21551915101
22561914101
23571914101
2460181390
2560181390
2662181280
2763181270
2865171170
2966171160
3067171060

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 5:47 AM, and sunset from 6:16 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:166:16
212.95:176:14
312.95:186:12
412.95:196:10
512.85:206:09
612.85:226:07
712.75:236:05
812.75:246:03
912.65:256:02
1012.65:266:00
1112.55:275:58
1212.55:285:56
1312.45:295:54
1412.45:305:52
1512.35:315:51
1612.35:325:49
1712.25:335:47
1812.25:345:45
1912.15:355:43
2012.15:365:42
2112.05:385:40
2212.05:395:38
2311.95:405:36
2411.95:415:34
2511.85:425:33
2611.85:435:31
2711.75:445:29
2811.75:455:27
2911.75:465:25
3011.65:475:24

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 1.64 kWh/m² to a high of 5.88 kWh/m² in June 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
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.0Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Smithfield

In seasonPeak

In September, Smithfield sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Smithfield sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Smithfield?

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 Smithfield for general sightseeing.

What to pack for Smithfield in September

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

In September, Smithfield sees daytime highs around 73°F and nights near 56°F. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Smithfield in September

The nearest coast averages about 67°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 38 mi away) is warmest in August at about 69°F and coldest in February near 39°F.

It's comfortable for a long swim from Jul 29 to Aug 30 — about 1.1 months when the water holds above 68°F.

40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan43Bracing
Feb39Bracing
Mar40Bracing
Apr44Bracing
May51Bracing
Jun60Cool
Jul67Cool
Aug69Refreshing
Sep67Cool
Oct62Cool
Nov55Bracing
Dec48Bracing

UV index in Smithfield 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 Smithfield peaks around July 10 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 10UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May8Very high
Jun7Very high
Jul8Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Smithfield 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 Smithfield is worst in July — around 16 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Nov 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May15Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep12Good
Oct10Good
Nov8Good
Dec10Good
Location & terrain

Where is Smithfield?

Smithfield sits at 41.9°N, 71.5°W, 276 ft above sea level, in United States. The nearest listed city is Woonsocket, 5.6 mi away.

Topography around Smithfield

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

Within 2 miles, the terrain around Smithfield has only modest variations in elevation — a maximum elevation change of 433 ft around an average of 387 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 801 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,165 ft.

The land around Smithfield is covered by trees (86%) within 2 miles, trees (79%) within 10 miles, and trees (72%) within 50 miles.

2 miles
433 ft
10 miles
801 ft
50 miles
2,165 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Woonsocket 5.6 mi · Lincoln 5.6 mi · North Providence 6.8 mi · Cumberland 6.8 mi · Johnston 7.5 mi · Central Falls 8.1 mi · Pawtucket 9.3 mi · Providence 9.9 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 Smithfield (41.922°, -71.5495°, elevation 276 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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. 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).