Osimo weather in September

In September, Osimo sees average daytime highs of 25°C and overnight lows near 18°C, with 60 mm of rain across 7.8 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 27°C in the first days to 23°C by the end. The sky is clear or mostly clear about 53% of the time in September, and the air most often feels humid.

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 Osimo's 4th-clearest and 8th-windiest month. For the whole year in context, see Osimo's year-round climate.

Daytime high
25°
4th warmest
Overnight low
18°
9th coldest
Rainfall
60 mm
7.8 wet days
Daylight
12 h 18 min
5:52 AM – 6:09 PM
Cloud cover
41%
4th clearest
Wind
10 km/h
8th windiest
Solar energy
4.48 kWh/m²
Travel score
7.4
out of 10

Osimo is chief town of the homonym municipality.

Air quality
Good
PM10 27.6 µg/m³ · 2010

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 27°C in the first days to 23°C by the end.

A typical September day in Osimo reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 28°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12720
22720
32719
42619
52619
62619
72619
82619
92619
102618
112518
122518
132518
142518
152518
162518
172418
182417
192417
202417
212417
222417
232417
242317
252316
262316
272316
282316
292316
302316

Osimo 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 (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 508.80.59.12.5
Feb11° / 538.70.610.22.8
Mar14° / 638.40.211.64.3
Apr17° / 10°629.5013.25.6
May22° / 15°578.3014.57.1
Jun27° / 19°386.2015.27.5
Jul29° / 21°284.5014.96.7
Aug29° / 21°415.8013.86.6
Sep25° / 18°607.8012.37.4
Oct20° / 14°598.1010.86.7
Nov15° / 10°7110.50.19.54.6
Dec11° / 6710.10.28.82.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 30%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17822
27822
37723
47624
57624
67525
77426
87426
97228
107129
117129
127129
137030
147030
157030
166931
176832
186832
196832
206733
216733
226832
236832
246832
256733
266733
276634
286535
296535
306535

Chance of precipitation in September

Any precipitation

Osimo gets around 60 mm 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
325
425
525
625
725
825
926
1026
1126
1227
1327
1428
1528
1628
1729
1829
1929
2029
2128
2228
2327
2427
2526
2626
2726
2826
2926
3026

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the humid band about 33% 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 (%)
1121939273
2131939262
3142039242
4152139232
5162139221
6172239211
7182239201
8192239201
9202239190
10202238190
11212338190
12222337190
13222336180
14232435180
15242434180
16242533170
17252533170
18262632160
19282631150
20292730140
21302729130
22312829120
23322928110
24333028100
2533312790
2634312780
2734322670
2835332660
2936332660
3036332550

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:34 AM to 6:08 AM, and sunset from 6:37 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:346:37
213.05:366:35
312.95:376:34
412.95:386:32
512.85:396:30
612.85:406:28
712.75:416:26
812.75:426:24
912.65:446:22
1012.65:456:21
1112.55:466:19
1212.55:476:17
1312.45:486:15
1412.45:496:13
1512.35:506:11
1612.35:526:09
1712.25:536:07
1812.25:546:05
1912.15:556:03
2012.15:566:02
2112.05:576:00
2212.05:595:58
2311.96:005:56
2411.96:015:54
2511.86:025:52
2611.86:035:50
2711.76:045:48
2811.76:065:46
2911.66:075:45
3011.66:085:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.48 kWh/m².

For context, solar energy here swings from a low near 1.46 kWh/m² to a high of 6.95 kWh/m² in July across the year — September's 4.48 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
74.9Bright
84.8Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.6Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.0Bright
254.0Bright
264.0Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Is September a good time to visit Osimo?

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

7.4
Sightseeing
2nd-best month of the year
6.5
Beach & pool
4th-best month of the year

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

What to pack for Osimo in September

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

In September, Osimo sees daytime highs around 25°C and nights near 18°C. Worth packing: light clothes. About 8 days see rain.

light clothes

Sea temperature near Osimo in September

The nearest coast averages about 23°C 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 18 km away) is warmest in August at about 26°C and coldest in March near 11°C.

It's comfortable for a long swim from Jun 2 to Oct 10 — about 4.3 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb11Bracing
Mar11Bracing
Apr13Bracing
May18Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep23Refreshing
Oct19Cool
Nov16Cool
Dec14Bracing

UV index in Osimo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Osimo peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highHighModerateLowJul 16UV 9Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr6High
May7High
Jun8Very high
Jul9Very high
Aug8Very high
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Osimo 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 Osimo is worst in March — around 17 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (September, 11 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodGoodMar 1917 µg/m³Sep 1411 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb16Moderate
Mar17Moderate
Apr17Moderate
May14Moderate
Jun14Moderate
Jul12Good
Aug12Good
Sep11Good
Oct13Moderate
Nov11Good
Dec11Good
Location & terrain

Where is Osimo?

Osimo sits at 43.5°N, 13.5°E, 265 m above sea level, in Italy. The nearest listed city is Ancona, 14 km away.

Topography around Osimo

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Osimo.

Within 3 km, the terrain around Osimo has significant variations in elevation — a maximum elevation change of 271 m around an average of 103 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 571 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,455 m.

The land around Osimo is covered by cropland (53%) within 3 km, cropland (54%) within 16 km, and water (32%), trees (30%) and cropland (22%) within 80 km.

3 km
271 m
16 km
571 m
80 km
2,455 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Ancona 14 km · Falconara Marittima 17 km · Jesi 20 km · Macerata 21 km · Civitanova Marche 28 km · Senigallia 34 km · Porto Sant'Elpidio 34 km · Tolentino 35 km

Italy travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
230 V · 50 Hz
Prices
≈ 69% of US
price level, 2025
GDP per capita
$43,309
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 513
Religion
Christian 81%unaffiliated 13%Muslim 5%other 1%

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 Osimo (43.4854°, 13.4822°, elevation 265 m), 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).