Augusta weather in September

In September, Augusta sees average daytime highs of 70°F and overnight lows near 52°F, with 3.4 in of rain across 8.7 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 75°F in the first days to 65°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 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Augusta's 1st-clearest and 9th-windiest month. For the whole year in context, see Augusta's year-round climate.

Daytime high
70°
4th warmest
Overnight low
52°
9th coldest
Rainfall
3.4 in
8.7 wet days
Daylight
12 h 18 min
5:24 AM – 5:42 PM
Cloud cover
54%
1st clearest
Wind
6 mph
9th windiest
Solar energy
4.14 kWh/m²
Travel score
6.8
out of 10

Augusta is capital city of the U.S. state of Maine and county seat of Kennebec County.

Density
126/km²
people per km²
Founded
1628

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 75°F in the first days to 65°F by the end.

A typical September day in Augusta reaches about 70°F in the afternoon and slips back to 52°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 80°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)
17557
27557
37556
47456
57456
67455
77355
87355
97355
107254
117254
127253
137153
147153
157152
167052
177052
186951
196951
206951
216850
226850
236750
246749
256649
266649
276648
286548
296547
306447

How September really feels in Augusta

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.

Augusta 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
Jan29° / 12°3.28.86.69.10.0
Feb32° / 13°3.08.76.910.20.0
Mar40° / 23°3.810.35.911.60.2
Apr53° / 35°3.710.82.413.22.9
May64° / 46°3.010.50.114.55.5
Jun74° / 55°3.610.6015.36.5
Jul80° / 61°3.09.70156.6
Aug78° / 60°3.09.1013.86.9
Sep70° / 52°3.48.7012.36.8
Oct58° / 42°4.49.90.310.84.3
Nov45° / 31°3.59.31.99.41.1
Dec35° / 20°4.110.66.58.70.0

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 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25644
35545
45545
55446
65446
75446
85446
95347
105347
115347
125347
135347
145248
155248
165248
175149
185149
195248
205149
215149
225149
235149
245050
255050
265050
275149
285149
295149
305149

Chance of precipitation in September

Any precipitation

Augusta gets around 3.4 in of rain over 8.7 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
226
326
427
528
628
729
829
929
1030
1130
1230
1330
1430
1529
1629
1729
1829
1929
2029
2129
2229
2329
2429
2530
2630
2730
2831
2931
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 60% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
142272210
24326219
34426219
44526208
54626208
64726207
74825197
85025196
95124196
105124196
115323195
125522185
135622184
145721184
155821174
166020173
176120163
186319153
196419152
206618142
216618142
226817132
236917122
247116112
257116112
267415101
27751591
28771481
29781471
30791371

Wind in September

Winds average 6 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
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min 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 90 minutes over September. Sunrise moves from 5:06 AM to 5:41 AM, and sunset from 6:11 PM to 5:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:066:11
213.05:086:09
313.05:096:07
412.95:106:06
512.95:116:04
612.85:126:02
712.85:146:00
812.75:155:58
912.75:165:56
1012.65:175:54
1112.65:185:52
1212.55:205:50
1312.55:215:48
1412.45:225:46
1512.45:235:44
1612.35:245:42
1712.25:265:41
1812.25:275:39
1912.15:285:37
2012.15:295:35
2112.05:305:33
2212.05:325:31
2311.95:335:29
2411.95:345:27
2511.85:355:25
2611.85:365:23
2711.75:385:21
2811.75:395:19
2911.65:405:17
3011.65:415:15

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 1.47 kWh/m² to a high of 5.93 kWh/m² in July across the year — September's 4.14 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.0Bright
194.0Moderate
203.9Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.7Moderate
253.7Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.4Moderate
Planning a trip in September

Hazard calendar for Augusta

In seasonPeak

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

Augusta 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 Augusta?

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 Augusta for sightseeing.

What to pack for Augusta in September

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

In September, Augusta sees daytime highs around 70°F and nights near 52°F. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Augusta in September

The nearest coast averages about 58°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 31 mi away) is warmest in August at about 62°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°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan41Bracing
Feb38Bracing
Mar38Bracing
Apr41Bracing
May47Bracing
Jun54Bracing
Jul60Cool
Aug62Cool
Sep58Bracing
Oct54Bracing
Nov49Bracing
Dec45Bracing

UV index in Augusta in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Augusta peaks around July 13 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 21 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 13UV 7Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May7High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Augusta?

Augusta sits at 44.3°N, 69.8°W, 125 ft above sea level, in United States. The nearest listed city is Waterville, 18 mi away.

Topography around Augusta

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

Within 2 miles, the terrain around Augusta has only modest variations in elevation — a maximum elevation change of 482 ft around an average of 207 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 709 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,655 ft.

The land around Augusta is covered by trees (62%) within 2 miles, trees (76%) within 10 miles, and trees (73%) and water (21%) within 50 miles.

2 miles
482 ft
10 miles
709 ft
50 miles
3,655 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Waterville 18 mi · Lewiston 26 mi · Auburn 27 mi · Brunswick 29 mi · Portland 51 mi · South Portland 52 mi · Westbrook 53 mi · South Portland Gardens 53 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 Augusta (44.3106°, -69.7795°, elevation 125 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).