Monroe weather in September

In September, Monroe sees average daytime highs of 82°F and overnight lows near 64°F, with 4.2 in of rain across 9.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 78°F by the end. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Monroe's 5th-clearest and 9th-windiest month. For the whole year in context, see Monroe's year-round climate.

Daytime high
82°
4th warmest
Overnight low
64°
9th coldest
Rainfall
4.2 in
9.4 wet days
Daylight
12 h 12 min
6:10 AM – 6:23 PM
Cloud cover
55%
5th clearest
Wind
5 mph
9th windiest
Solar energy
4.58 kWh/m²
Travel score
6.3
out of 10

Monroe is city in and county seat of Union County, North Carolina, United States.

Density
440/km²
people per km²
Founded
1843

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 85°F in the first days to 78°F by the end.

A typical September day in Monroe reaches about 82°F in the afternoon and slips back to 64°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 74°F and 89°F. Set against its neighbours, September runs about 5°F cooler than August and about 9°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18568
28568
38567
48567
58567
68467
78466
88466
98466
108366
118365
128365
138365
148265
158264
168264
178164
188164
198163
208063
218063
228062
238062
247962
257961
267961
277860
287860
297860
307759

How September really feels in Monroe

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.

Monroe weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan52° / 34°3.79.419.93.0
Feb56° / 37°3.38.90.810.73.8
Mar64° / 43°3.99.80.311.75.7
Apr73° / 52°3.58.6012.97.0
May80° / 60°3.210.5013.86.4
Jun86° / 68°4.313.2014.34.5
Jul89° / 72°4.415.6014.13.6
Aug87° / 70°4.413013.34.4
Sep82° / 64°4.29.4012.26.3
Oct72° / 53°3.37.1011.17.3
Nov62° / 42°3.27.80.110.25.8
Dec55° / 37°3.79.10.49.73.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55347
65347
75347
85347
95446
105347
115347
125347
135446
145347
155248
165347
175248
185248
195248
205248
215347
225248
235347
245347
255446
265446
275545
285545
295545
305545

Chance of precipitation in September

Any precipitation

Monroe gets around 4.2 in of rain over 9.4 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 30% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
134
234
333
433
532
632
731
831
931
1030
1130
1230
1329
1429
1529
1629
1730
1830
1930
2031
2131
2231
2330
2430
2530
2629
2729
2828
2928
3028

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 46% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1411173928
2412183827
3513193726
4514203625
5614203524
6715213423
7716213322
8816223321
9916223220
101017223219
111117223218
121217213217
131318213216
141418213315
151518203314
161519203313
171619203312
181719193311
191820193211
201920193210
21202019319
22212019319
23232019308
24242019298
25262020277
26272020267
27282020256
28302020236
29312021226
30332021216

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:59 AM to 6:21 AM, and sunset from 6:45 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:596:45
212.76:006:44
312.76:006:42
412.76:016:41
512.66:026:39
612.66:036:38
712.66:036:36
812.56:046:35
912.56:056:33
1012.46:066:32
1112.46:066:30
1212.46:076:29
1312.36:086:27
1412.36:096:26
1512.36:096:25
1612.26:106:23
1712.26:116:22
1812.16:126:20
1912.16:126:19
2012.16:136:17
2112.06:146:16
2212.06:156:14
2312.06:156:13
2411.96:166:11
2511.96:176:10
2611.86:186:08
2711.86:186:07
2811.86:196:05
2911.76:206:04
3011.76:216:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.58 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 6.18 kWh/m² in June across the year — September's 4.58 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.1Bright
Planning a trip in September

Is September a good time to visit Monroe?

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

6.3
Sightseeing
4th-best month of the year
6.8
Beach & pool
1st-best month of the year

September is a reasonable time to visit Monroe for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Monroe in September

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

In September, Monroe sees daytime highs around 82°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Monroe in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Monroe peaks around July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 13UV 9Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7Very high
Oct5Moderate
Nov4Moderate
Dec2Moderate

Air quality in Monroe 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 Monroe is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 2418 µg/m³Dec 207 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar13Moderate
Apr12Good
May13Moderate
Jun16Moderate
Jul18Moderate
Aug18Moderate
Sep16Moderate
Oct14Moderate
Nov9Good
Dec7Good
Location & terrain

Where is Monroe?

Monroe sits at 35.0°N, 80.5°W, 591 ft above sea level, in United States. The nearest listed city is Indian Trail, 9.3 mi away.

Topography around Monroe

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

Within 2 miles, the terrain around Monroe has only modest variations in elevation — a maximum elevation change of 161 ft around an average of 600 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 377 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,617 ft.

The land around Monroe is covered by trees (50%) and grassland (21%) within 2 miles, trees (49%), grassland (24%) and cropland (22%) within 10 miles, and trees (76%) within 50 miles.

2 miles
161 ft
10 miles
377 ft
50 miles
1,617 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Indian Trail 9.3 mi · Stallings 11 mi · Matthews 14 mi · Mint Hill 14 mi · Charlotte 24 mi · Rock Hill 27 mi · Concord 29 mi · Albemarle 32 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 Monroe (34.9854°, -80.5495°, elevation 591 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. 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).