Tiffin weather in September

In September, Tiffin sees average daytime highs of 75°F and overnight lows near 56°F, with 2.7 in of rain across 9.1 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 37% 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 Tiffin's 1st-clearest and 10th-windiest month. For the whole year in context, see Tiffin's year-round climate.

Daytime high
75°
4th warmest
Overnight low
56°
9th coldest
Rainfall
2.7 in
9.1 wet days
Daylight
12 h 18 min
6:19 AM – 6:35 PM
Cloud cover
52%
1st clearest
Wind
8 mph
10th windiest
Solar energy
4.4 kWh/m²
Travel score
7.0
out of 10

Tiffin is city in and the county seat of Seneca County, Ohio, United States.

Density
990/km²
people per km²
Founded
1812

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 Tiffin 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 65°F and 85°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)
17961
27960
37960
47960
57860
67859
77859
87858
97758
107758
117757
127657
137657
147656
157556
167556
177555
187455
197454
207454
217354
227353
237353
247253
257252
267152
277151
287151
297051
307050

How September really feels in Tiffin

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.

Tiffin 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
Jan34° / 21°2.910.76.29.40.0
Feb37° / 22°2.49.15.210.40.0
Mar48° / 30°3.411.23.611.71.6
Apr60° / 41°4.112.60.813.14.5
May71° / 52°4.313.3014.36.0
Jun79° / 61°4.012014.96.3
Jul82° / 65°3.411.3014.76.1
Aug81° / 63°3.210.2013.66.5
Sep75° / 56°2.79.1012.37.0
Oct63° / 45°2.89.40.210.95.5
Nov50° / 35°3.19.21.49.72.2
Dec39° / 26°2.910.24.39.10.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% 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 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
26040
36040
46040
56040
65941
75842
85842
95743
105743
115743
125644
135545
145545
155446
165446
175446
185446
195248
205248
215248
225248
235248
245248
255248
265248
275149
285149
295050
305149

Chance of precipitation in September

Any precipitation

Tiffin gets around 2.7 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 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
130
230
330
430
530
630
730
830
930
1030
1130
1229
1330
1430
1530
1630
1730
1830
1930
2030
2130
2231
2331
2431
2532
2632
2732
2832
2931
3031

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 51% of days. Sticky, muggy-or-worse air turns up on roughly 12% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1262324224
2282324224
3292323214
4312423203
5332422193
6352421182
7372421172
8392420162
9402420151
10422419141
11442418131
12452418131
13472317120
14492317120
15502316110
16532215100
17532215100
1856211490
1959201380
2059201380
2162191270
2264181170
2365181160
2467171060
2567171060
267016950
277115950
287115950
297314850
307414840

Wind in September

Winds average 8 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 9 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
117calm
127calm
137light breeze
147light 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
309light 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 6:34 AM, and sunset from 7:01 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:047:01
212.96:057:00
312.96:066:58
412.86:076:56
512.86:086:54
612.76:096:53
712.76:106:51
812.66:116:49
912.66:126:48
1012.56:136:46
1112.56:146:44
1212.56:156:42
1312.46:166:40
1412.46:176:39
1512.36:186:37
1612.36:196:35
1712.26:206:33
1812.26:216:32
1912.16:226:30
2012.16:236:28
2112.06:246:26
2212.06:256:24
2311.96:266:23
2411.96:276:21
2511.86:286:19
2611.86:296:17
2711.86:306:16
2811.76:316:14
2911.76:336:12
3011.66:346:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.4 kWh/m².

For context, solar energy here swings from a low near 1.57 kWh/m² to a high of 6.28 kWh/m² in June across the year — September's 4.4 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.2Bright
234.1Bright
244.0Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Tiffin?

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

7.0
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 Tiffin for general sightseeing.

What to pack for Tiffin in September

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

In September, Tiffin sees daytime highs around 75°F and nights near 56°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Tiffin in September

The nearest coast averages about 70°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 35 mi away) is warmest in August at about 75°F and coldest in February near 33°F.

It's comfortable for a long swim from Jun 19 to Sep 21 — about 3.1 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan34Bracing
Feb33Bracing
Mar35Bracing
Apr43Bracing
May55Bracing
Jun67Cool
Jul75Refreshing
Aug75Warm
Sep70Refreshing
Oct59Bracing
Nov46Bracing
Dec38Bracing

UV index in Tiffin 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 Tiffin peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 21UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Tiffin 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 Tiffin is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1116 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar13Moderate
Apr14Moderate
May15Moderate
Jun16Moderate
Jul16Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Tiffin?

Tiffin sits at 41.1°N, 83.2°W, 745 ft above sea level, in United States. The nearest listed city is Fremont, 17 mi away.

Topography around Tiffin

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

Within 2 miles, the terrain around Tiffin has only modest variations in elevation — a maximum elevation change of 167 ft around an average of 764 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 430 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,106 ft.

The land around Tiffin is covered by grassland (27%), cropland (26%) and trees (25%) within 2 miles, cropland (71%) within 10 miles, and cropland (61%) within 50 miles.

2 miles
167 ft
10 miles
430 ft
50 miles
1,106 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Fremont 17 mi · Findlay 25 mi · Bowling Green 30 mi · Norwalk 30 mi · Sandusky 34 mi · Marion 37 mi · Perrysburg 39 mi · Oregon 40 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 Tiffin (41.1145°, -83.178°, elevation 745 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. 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).