Flint weather in September

In September, Flint sees average daytime highs of 72°F and overnight lows near 53°F, with 2.8 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 77°F in the first days to 67°F by the end. The sky is clear or mostly clear about 34% 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 Flint's 2nd-clearest and 9th-windiest month. For the whole year in context, see Flint's year-round climate.

Daytime high
72°
4th warmest
Overnight low
53°
9th coldest
Rainfall
2.8 in
9.1 wet days
Daylight
12 h 18 min
6:20 AM – 6:38 PM
Cloud cover
56%
2nd clearest
Wind
7 mph
9th windiest
Solar energy
4.21 kWh/m²
Travel score
6.8
out of 10

Flint is seat of Genesee County, Michigan, United States of America.

Density
1,115/km²
people per km²
Founded
1818

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 67°F by the end.

A typical September day in Flint reaches about 72°F in the afternoon and slips back to 53°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 83°F. Set against its neighbours, September runs about 7°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17759
27758
37758
47658
57657
67657
77557
87556
97556
107456
117455
127455
137355
147354
157354
167253
177253
187253
197152
207152
217051
227051
236951
246950
256950
266849
276849
286749
296748
306648

How September really feels in Flint

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.

Flint 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
Jan31° / 18°2.39.47.39.20.0
Feb33° / 19°1.97.86.610.20.0
Mar44° / 27°2.39.44.211.60.9
Apr57° / 38°3.511.21.713.13.8
May68° / 49°3.611.7014.46.0
Jun78° / 58°3.610.7015.16.6
Jul81° / 63°3.010.6014.86.4
Aug79° / 61°3.010.3013.86.7
Sep72° / 53°2.89.1012.36.8
Oct59° / 43°2.910.10.210.84.6
Nov46° / 33°2.59.32.19.51.2
Dec35° / 24°2.19.46.28.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 50%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25446
35446
45446
55446
65446
75446
85347
95347
105248
115149
125149
135050
145050
155050
164951
174951
184951
195050
205050
214852
224852
234852
244852
254753
264753
274753
284753
294753
304753

Chance of precipitation in September

Any precipitation

Flint gets around 2.8 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 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
128
229
329
429
529
629
729
829
929
1029
1129
1229
1329
1429
1529
1629
1729
1829
1930
2030
2130
2231
2332
2432
2533
2634
2734
2835
2935
3035

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 59% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1342719172
2362718162
3382717152
4402717142
5422716132
6442616132
7462615122
8472515111
9492514101
10502514101
1152241491
1253241391
1355231381
1455231381
1558221370
1660211270
1761211260
1863201160
1964201150
2066191050
216818950
226918940
237117840
247316740
257416730
267515730
277714630
287814620
297913620
308012620

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
258light 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 6:04 AM to 6:36 AM, and sunset from 7:05 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:047:05
213.06:057:04
312.96:067:02
412.96:077:00
512.86:086:58
612.86:096:56
712.76:106:54
812.76:116:53
912.66:136:51
1012.66:146:49
1112.56:156:47
1212.56:166:45
1312.46:176:43
1412.46:186:41
1512.36:196:40
1612.36:206:38
1712.26:226:36
1812.26:236:34
1912.16:246:32
2012.16:256:30
2112.06:266:28
2212.06:276:26
2311.96:286:25
2411.96:306:23
2511.86:316:21
2611.86:326:19
2711.76:336:17
2811.76:346:15
2911.66:356:13
3011.66:366:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.21 kWh/m².

For context, solar energy here swings from a low near 1.35 kWh/m² to a high of 6.28 kWh/m² in June across the year — September's 4.21 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
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 Flint?

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

6.8
Sightseeing
1st-best month of the year
4.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Flint for sightseeing.

What to pack for Flint in September

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

In September, Flint sees daytime highs around 72°F and nights near 53°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Flint 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 44 mi away) is warmest in August at about 72°F and coldest in February near 33°F.

It's comfortable for a long swim from Jul 12 to Sep 9 — about 2 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan35Bracing
Feb33Bracing
Mar34Bracing
Apr39Bracing
May48Bracing
Jun60Cool
Jul70Refreshing
Aug72Refreshing
Sep67Cool
Oct55Bracing
Nov45Bracing
Dec39Bracing

UV index in Flint 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 Flint peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 highHighModerateLowJun 19UV 9Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May7Very high
Jun9Very high
Jul8Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Flint?

Flint sits at 43.0°N, 83.7°W, 751 ft above sea level, in United States. The nearest listed city is Burton, 3.7 mi away.

Topography around Flint

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

Within 2 miles, the terrain around Flint has only modest variations in elevation — a maximum elevation change of 148 ft around an average of 758 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 400 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 705 ft.

The land around Flint is covered by trees (38%), artificial surfaces (38%) and grassland (20%) within 2 miles, trees (46%) and grassland (27%) within 10 miles, and trees (40%) and cropland (38%) within 50 miles.

2 miles
148 ft
10 miles
400 ft
50 miles
705 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Burton 3.7 mi · Waterford 26 mi · Saginaw 31 mi · Auburn Hills 32 mi · Pontiac 33 mi · West Bloomfield Township 34 mi · Saginaw Township North 35 mi · Rochester Hills 37 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 Flint (43.0125°, -83.6875°, elevation 751 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. 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).