Sidney weather in September

In September, Sidney sees average daytime highs of 76°F and overnight lows near 56°F, with 2.8 in of rain across 7.8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 79°F in the first days to 71°F by the end. The sky is clear or mostly clear about 40% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Sidney's 1st-clearest and 10th-windiest month. For the whole year in context, see Sidney's year-round climate.

Daytime high
76°
4th warmest
Overnight low
56°
9th coldest
Rainfall
2.8 in
7.8 wet days
Daylight
12 h 18 min
6:23 AM – 6:39 PM
Cloud cover
51%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.51 kWh/m²
Travel score
7.2
out of 10

Sidney is seat of Shelby County, Ohio, United States.

Density
668/km²
people per km²

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 71°F by the end.

A typical September day in Sidney reaches about 76°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 65°F and 86°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18062
28061
38061
47961
57960
67960
77860
87859
97859
107858
117758
127758
137757
147657
157656
167656
177556
187555
197555
207455
217454
227454
237353
247353
257253
267252
277252
287151
297151
307051

How September really feels in Sidney

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.

Sidney weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 21°3.110.35.49.50.0
Feb38° / 24°2.58.94.810.40.0
Mar49° / 32°3.6112.911.71.9
Apr62° / 42°4.512.60.8134.8
May71° / 53°4.313.6014.26.0
Jun80° / 62°4.012014.86.2
Jul83° / 65°3.411.4014.65.9
Aug81° / 64°3.310013.66.5
Sep76° / 56°2.87.8012.37.2
Oct63° / 45°2.98.70.210.95.7
Nov50° / 35°3.391.29.82.3
Dec39° / 26°3.1103.79.20.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 42%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36139
46139
56139
66139
76139
86139
96139
105941
115941
125941
135842
145842
155743
165644
175644
185644
195644
205545
215644
225644
235644
245545
255545
265545
275545
285545
295545
305545

Chance of precipitation in September

Any precipitation

Sidney gets around 2.8 in of rain over 7.8 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 26% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
226
326
426
525
625
725
824
924
1024
1124
1224
1324
1425
1525
1625
1726
1826
1927
2027
2127
2228
2328
2428
2528
2629
2729
2828
2928
3028

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 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1252322246
2262422235
3282422225
4292421214
5312520204
6332520193
7352519183
8372519172
9392518162
10402518152
11422517151
12442517141
13452416141
14472415130
15492315120
16512314120
17532214110
18562113100
19562113100
2059201290
2161191280
2263181180
2364181170
2466171070
2567171060
2668161060
277016950
287016950
297115950
307215850

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227light 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 12 h 54 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 78 minutes over September. Sunrise moves from 6:08 AM to 6:37 AM, and sunset from 7:04 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:087:04
212.96:097:03
312.86:107:01
412.86:116:59
512.86:126:58
612.76:136:56
712.76:146:54
812.66:156:53
912.66:166:51
1012.56:176:49
1112.56:186:47
1212.46:196:46
1312.46:206:44
1412.46:216:42
1512.36:226:41
1612.36:236:39
1712.26:246:37
1812.26:256:35
1912.16:266:34
2012.16:276:32
2112.06:286:30
2212.06:296:28
2311.96:306:27
2411.96:316:25
2511.96:326:23
2611.86:336:21
2711.86:346:20
2811.76:356:18
2911.76:366:16
3011.66:376:15

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 1.63 kWh/m² to a high of 6.25 kWh/m² in June across the year — September's 4.51 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.0Bright
284.0Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Sidney?

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
6.1
Beach & pool
4th-best month of the year

September is one of the better times to visit Sidney for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Sidney in September

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

In September, Sidney sees daytime highs around 76°F and nights near 56°F. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

UV index in Sidney 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 Sidney peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 20UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Sidney 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 Sidney is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1217 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Sidney?

Sidney sits at 40.3°N, 84.2°W, 951 ft above sea level, in United States. The nearest listed city is Piqua, 11 mi away.

Topography around Sidney

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

Within 2 miles, the terrain around Sidney has only modest variations in elevation — a maximum elevation change of 207 ft around an average of 1,020 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 427 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 879 ft.

The land around Sidney is covered by trees (31%), grassland (23%) and artificial surfaces (23%) within 2 miles, cropland (70%) within 10 miles, and cropland (73%) within 50 miles.

2 miles
207 ft
10 miles
427 ft
50 miles
879 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Piqua 11 mi · Troy 17 mi · Vandalia 27 mi · Huber Heights 30 mi · Springfield 31 mi · Lima 32 mi · Fairborn 33 mi · Trotwood 35 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 Sidney (40.2842°, -84.1555°, elevation 951 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).