Saco weather in September

In September, Saco sees average daytime highs of 70°F and overnight lows near 55°F, with 3.2 in of rain across 8.2 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 74°F in the first days to 65°F by the end. The sky is clear or mostly clear about 39% 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 Saco's 1st-clearest and 9th-windiest month. For the whole year in context, see Saco's year-round climate.

Daytime high
70°
4th warmest
Overnight low
55°
9th coldest
Rainfall
3.2 in
8.2 wet days
Daylight
12 h 18 min
5:27 AM – 5:45 PM
Cloud cover
54%
1st clearest
Wind
7 mph
9th windiest
Solar energy
4.25 kWh/m²
Travel score
6.8
out of 10

Saco is city in York County, Maine, United States.

Density
140/km²
people per km²
Founded
1630

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 74°F in the first days to 65°F by the end.

A typical September day in Saco reaches about 70°F in the afternoon and slips back to 55°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 79°F. Set against its neighbours, September runs about 7°F cooler than August and about 11°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17560
27459
37459
47459
57459
67358
77358
87358
97257
107257
117257
127156
137156
147156
157055
167055
177055
186955
196954
206954
216853
226853
236753
246753
256752
266652
276651
286551
296551
306550

How September really feels in Saco

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.

Saco 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
Jan32° / 19°3.39.46.69.10.0
Feb34° / 19°3.18.86.210.20.0
Mar41° / 27°4.110.65.511.60.3
Apr53° / 38°3.810.11.613.22.9
May63° / 47°2.910.10.114.55.3
Jun73° / 57°3.410015.26.6
Jul78° / 64°2.99.2014.96.8
Aug77° / 62°2.98.4013.87.1
Sep70° / 55°3.28.2012.36.8
Oct59° / 45°4.39.70.210.84.6
Nov48° / 35°3.59.21.39.51.7
Dec38° / 26°4.210.25.48.80.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25743
35743
45545
55545
65545
75545
85347
95347
105347
115347
125347
135347
145446
155446
165446
175347
185446
195347
205347
215347
225347
235347
245248
255248
265347
275347
285347
295347
305347

Chance of precipitation in September

Any precipitation

Saco gets around 3.2 in of rain over 8.2 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 (%)
124
224
325
426
526
627
728
828
928
1029
1129
1229
1329
1428
1528
1628
1727
1827
1927
2027
2127
2227
2327
2427
2527
2627
2728
2828
2928
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 49% 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 (%)
1302824161
2312824161
3322823151
4342823151
5352822141
6362822131
7382821121
8392821121
9402721111
10412721110
11432621100
12442620100
1345262090
1447251990
1548251980
1649251870
1750251870
1852241770
1953241760
2055231660
2155231660
2257231550
2359221450
2461221340
2562211340
2663211240
2765211130
2867201030
296920920
307119820

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247light breeze
257light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light 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 5:10 AM to 5:44 AM, and sunset from 6:13 PM to 5:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:106:13
213.05:116:11
312.95:126:09
412.95:136:07
512.85:156:06
612.85:166:04
712.75:176:02
812.75:186:00
912.65:195:58
1012.65:205:56
1112.55:225:54
1212.55:235:52
1312.45:245:51
1412.45:255:49
1512.35:265:47
1612.35:275:45
1712.25:285:43
1812.25:305:41
1912.15:315:39
2012.15:325:37
2112.05:335:35
2212.05:345:33
2311.95:355:32
2411.95:375:30
2511.85:385:28
2611.85:395:26
2711.75:405:24
2811.75:415:22
2911.65:435:20
3011.65:445:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 1.51 kWh/m² to a high of 6.12 kWh/m² in July across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.0Bright
224.0Moderate
233.9Moderate
243.9Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Saco

In seasonPeak

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

Saco 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 Saco?

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

6.8
Sightseeing
2nd-best month of the year
4.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Saco for sightseeing.

What to pack for Saco in September

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

In September, Saco sees daytime highs around 70°F and nights near 55°F. Worth packing: rain gear. About 8 days see rain.

rain gear

Sea temperature near Saco in September

The nearest coast averages about 61°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 9 mi away) is warmest in August at about 64°F and coldest in March near 38°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan42Bracing
Feb39Bracing
Mar38Bracing
Apr42Bracing
May48Bracing
Jun56Bracing
Jul62Cool
Aug64Cool
Sep61Cool
Oct55Bracing
Nov49Bracing
Dec45Bracing

UV index in Saco 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 Saco peaks around July 12 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateModerateLowJul 12UV 7Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5Moderate
May7High
Jun7High
Jul7Very high
Aug4Moderate
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Saco?

Saco sits at 43.5°N, 70.4°W, 66 ft above sea level, in United States. The nearest listed city is Biddeford, 0.6 mi away.

Topography around Saco

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

Within 2 miles, the terrain around Saco has only modest variations in elevation — a maximum elevation change of 223 ft around an average of 95 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 463 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,933 ft.

The land around Saco is covered by trees (65%) within 2 miles, trees (59%) and water (24%) within 10 miles, and trees (61%) and water (34%) within 50 miles.

2 miles
223 ft
10 miles
463 ft
50 miles
2,933 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Biddeford 0.6 mi · West Scarborough 5.6 mi · South Portland Gardens 11 mi · Westbrook 12 mi · South Portland 14 mi · Portland 14 mi · Sanford 17 mi · Rochester 30 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 Saco (43.5009°, -70.4428°, elevation 66 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).