Dixon weather in September

In September, Dixon sees average daytime highs of 75°F and overnight lows near 55°F, with 3.4 in of rain across 8.6 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 79°F in the first days to 70°F by the end. The sky is clear or mostly clear about 43% 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 Dixon's 1st-clearest and 9th-windiest month. For the whole year in context, see Dixon's year-round climate.

Daytime high
75°
4th warmest
Overnight low
55°
9th coldest
Rainfall
3.4 in
8.6 wet days
Daylight
12 h 18 min
5:44 AM – 6:01 PM
Cloud cover
49%
1st clearest
Wind
8 mph
9th windiest
Solar energy
4.51 kWh/m²
Travel score
7.1
out of 10

Dixon is city and county seat of Lee County, Illinois, United States.

Density
752/km²
people per km²
Founded
1828

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 79°F in the first days to 70°F by the end.

A typical September day in Dixon reaches about 75°F in the afternoon and slips back to 55°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 85°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)
17960
27960
37960
47959
57859
67859
77858
87858
97758
107757
117657
127656
137656
147556
157555
167555
177454
187454
197354
207353
217353
227252
237252
247151
257151
267151
277050
287050
296949
306949

How September really feels in Dixon

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.

Dixon weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan30° / 16°2.07.75.39.30.0
Feb34° / 19°1.96.64.410.30.0
Mar47° / 30°2.79.42.511.71.6
Apr60° / 41°4.511.60.913.14.5
May71° / 51°4.813.2014.36.0
Jun80° / 61°4.411.90156.3
Jul82° / 65°3.710.2014.76.2
Aug81° / 63°3.39.3013.76.7
Sep75° / 55°3.48.6012.37.1
Oct62° / 43°3.08.70.210.95.4
Nov47° / 32°2.67.81.49.61.6
Dec35° / 22°2.27.54.190.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% 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 42%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
26139
36139
46238
56238
66238
76238
86238
96238
106238
116139
126040
136040
145941
155842
165743
175644
185644
195644
205644
215545
225545
235446
245446
255446
265347
275347
285446
295446
305446

Chance of precipitation in September

Any precipitation

Dixon gets around 3.4 in of rain over 8.6 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 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
429
529
629
729
829
929
1029
1130
1230
1330
1430
1530
1630
1730
1830
1930
2029
2129
2229
2329
2429
2529
2628
2728
2828
2927
3027

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1232820228
2242820207
3262919197
4282919186
5302918176
6322918165
7342918155
8362917144
9382817144
10402816133
11412716133
12432616123
13452516122
14472415112
15492415112
16502315102
17532214101
1856211391
1956211391
2059201281
2161191181
2263191170
2366181060
2467171060
256917950
267016950
277315840
287315840
297414840
307713730

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 5:28 AM to 5:59 AM, and sunset from 6:27 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:286:27
212.95:296:26
312.95:306:24
412.85:316:22
512.85:326:20
612.85:336:19
712.75:346:17
812.75:356:15
912.65:366:13
1012.65:386:11
1112.55:396:10
1212.55:406:08
1312.45:416:06
1412.45:426:04
1512.35:436:02
1612.35:446:01
1712.25:455:59
1812.25:465:57
1912.15:475:55
2012.15:485:53
2112.05:495:51
2212.05:505:50
2311.95:515:48
2411.95:535:46
2511.85:545:44
2611.85:555:42
2711.75:565:41
2811.75:575:39
2911.75:585:37
3011.65:595:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.51 kWh/m².

For context, solar energy here swings from a low near 1.71 kWh/m² to a high of 6.34 kWh/m² in June across the year — September's 4.51 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Dixon?

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

7.1
Sightseeing
1st-best month of the year
5.7
Beach & pool
4th-best month of the year

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

What to pack for Dixon in September

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

In September, Dixon sees daytime highs around 75°F and nights near 55°F. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Dixon 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 Dixon 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 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 19UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Dixon 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 Dixon is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1915 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar13Moderate
Apr12Good
May13Moderate
Jun14Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Dixon?

Dixon sits at 41.8°N, 89.5°W, 682 ft above sea level, in United States. The nearest listed city is Sterling, 12 mi away.

Topography around Dixon

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

Within 2 miles, the terrain around Dixon has only modest variations in elevation — a maximum elevation change of 203 ft around an average of 735 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 299 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 886 ft.

The land around Dixon is covered by trees (30%), cropland (24%) and grassland (22%) within 2 miles, cropland (74%) within 10 miles, and cropland (77%) within 50 miles.

2 miles
203 ft
10 miles
299 ft
50 miles
886 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sterling 12 mi · Freeport 32 mi · Rockford 36 mi · Clinton 37 mi · DeKalb 38 mi · Loves Park 40 mi · Machesney Park 42 mi · Sycamore 42 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 Dixon (41.8389°, -89.4796°, elevation 682 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).