Muscatine weather in September

In September, Muscatine sees average daytime highs of 75°F and overnight lows near 56°F, with 3.6 in of rain across 8.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 80°F in the first days to 71°F by the end. The sky is clear or mostly clear about 46% 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 Muscatine's 1st-clearest and 9th-windiest month. For the whole year in context, see Muscatine's year-round climate.

Daytime high
75°
4th warmest
Overnight low
56°
9th coldest
Rainfall
3.6 in
8.4 wet days
Daylight
12 h 18 min
5:50 AM – 6:07 PM
Cloud cover
47%
1st clearest
Wind
8 mph
9th windiest
Solar energy
4.58 kWh/m²
Travel score
7.2
out of 10

Muscatine is city in and county seat of Muscatine County, Iowa, United States.

Density
509/km²
people per km²
Founded
1839

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 80°F in the first days to 71°F by the end.

A typical September day in Muscatine reaches about 75°F in the afternoon and slips back to 56°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 86°F. Set against its neighbours, September runs about 6°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18062
28061
38061
47960
57960
67960
77859
87859
97858
107758
117758
127657
137657
147656
157556
167556
177555
187455
197455
207454
217354
227353
237253
247252
257252
267151
277151
287151
297050
307050

How September really feels in Muscatine

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.

Muscatine 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
Jan30° / 15°1.77.15.19.30.0
Feb35° / 19°1.96.6410.30.0
Mar48° / 30°2.89.22.211.71.7
Apr60° / 42°4.111.80.713.14.6
May71° / 53°4.613.2014.36.1
Jun80° / 63°4.712014.96.2
Jul83° / 67°3.49.4014.75.9
Aug82° / 64°3.69.2013.76.6
Sep75° / 56°3.68.4012.37.2
Oct62° / 44°2.88.40.310.95.6
Nov48° / 32°2.47.51.29.71.8
Dec35° / 21°2.06.93.99.10.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% 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 40%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16337
26337
36436
46436
56436
66436
76535
86436
96337
106436
116337
126238
136139
146040
156040
165842
175842
185842
195743
205743
215743
225743
235743
245743
255743
265743
275743
285743
295743
305842

Chance of precipitation in September

Any precipitation

Muscatine gets around 3.6 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
627
727
828
928
1028
1129
1230
1330
1430
1531
1631
1731
1830
1930
2030
2129
2229
2329
2428
2528
2628
2727
2827
2926
3026

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
12024222410
22125212310
3232521229
4252521218
5272521207
6302520196
7322520186
8342419175
9362419175
10382418164
11402318154
12422317153
13442216143
14462216143
15482215132
16502114132
17512114122
18532113112
19562012111
20582011101
21591911101
2261191091
2363181081
2466171070
256717970
266916960
277016950
287215850
297315840
307514740

Wind in September

Winds average 8 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.

051015151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light 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 5:35 AM to 6:05 AM, and sunset from 6:33 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:356:33
212.95:366:31
312.95:376:30
412.85:386:28
512.85:396:26
612.75:406:24
712.75:416:23
812.65:426:21
912.65:436:19
1012.65:446:17
1112.55:456:16
1212.55:466:14
1312.45:476:12
1412.45:486:10
1512.35:496:08
1612.35:506:07
1712.25:516:05
1812.25:526:03
1912.15:536:01
2012.15:556:00
2112.05:565:58
2212.05:575:56
2311.95:585:54
2411.95:595:52
2511.86:005:51
2611.86:015:49
2711.86:025:47
2811.76:035:45
2911.76:045:44
3011.66:055:42

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 1.72 kWh/m² to a high of 6.39 kWh/m² in July across the year — September's 4.58 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.1Bright
284.0Bright
294.0Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Muscatine?

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

7.2
Sightseeing
1st-best month of the year
5.9
Beach & pool
4th-best month of the year

September is one of the better times to visit Muscatine for general sightseeing.

What to pack for Muscatine in September

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

In September, Muscatine sees daytime highs around 75°F and nights near 56°F. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Muscatine 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 Muscatine peaks around June 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 18UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Muscatine 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 Muscatine is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1916 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar13Moderate
Apr11Good
May13Moderate
Jun13Moderate
Jul16Moderate
Aug15Moderate
Sep11Good
Oct7Good
Nov8Good
Dec9Good
Location & terrain

Where is Muscatine?

Muscatine sits at 41.4°N, 91.0°W, 581 ft above sea level, in United States. The nearest listed city is Rock Island, 25 mi away.

Topography around Muscatine

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

Within 2 miles, the terrain around Muscatine has only modest variations in elevation — a maximum elevation change of 210 ft around an average of 597 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 305 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 627 ft.

The land around Muscatine is covered by trees (31%) and artificial surfaces (21%) within 2 miles, cropland (52%) and trees (25%) within 10 miles, and cropland (71%) within 50 miles.

2 miles
210 ft
10 miles
305 ft
50 miles
627 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Rock Island 25 mi · Davenport 25 mi · Moline 28 mi · Bettendorf 28 mi · Iowa City 30 mi · East Moline 32 mi · Coralville 33 mi · North Liberty 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 Muscatine (41.4245°, -91.0432°, elevation 581 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).