San Lazzaro weather in September

In September, San Lazzaro sees average daytime highs of 26°C and overnight lows near 16°C, with 66 mm of rain across 8.1 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 28°C in the first days to 23°C by the end. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is San Lazzaro's 3rd-clearest and 6th-windiest month. For the whole year in context, see San Lazzaro's year-round climate.

Daytime high
26°
4th warmest
Overnight low
16°
9th coldest
Rainfall
66 mm
8.1 wet days
Daylight
12 h 18 min
6:00 AM – 6:18 PM
Cloud cover
44%
3rd clearest
Wind
7 km/h
6th windiest
Solar energy
4.23 kWh/m²
Travel score
7.1
out of 10

San Lazzaro is chief town of the homonym municipality.

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 28°C in the first days to 23°C by the end.

A typical September day in San Lazzaro reaches about 26°C in the afternoon and slips back to 16°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 30°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12918
22818
32818
42818
52817
62817
72717
82717
92717
102717
112717
122716
132616
142616
152616
162616
172616
182516
192515
202515
212515
222515
232415
242415
252415
262414
272414
282314
292314
302314

How September really feels in San Lazzaro

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
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.

San Lazzaro 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
Jan / 427.21.691.6
Feb10° / 617.71.710.12.6
Mar15° / 598.10.611.64.8
Apr19° / 7210.10.113.26.1
May24° / 14°709.4014.67.0
Jun29° / 18°588015.36.1
Jul31° / 20°497.10154.8
Aug31° / 20°557.9013.95.1
Sep26° / 16°668.1012.37.1
Oct20° / 12°728.9010.76.4
Nov14° / 83100.49.43.9
Dec / 638.51.28.71.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 31%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17624
27624
37624
47624
57525
67525
77426
87426
97327
107327
117228
127129
137129
147030
156931
166832
176733
186733
196535
206535
216535
226535
236535
246436
256436
266337
276337
286337
296238
306139

Chance of precipitation in September

Any precipitation

San Lazzaro gets around 66 mm of rain over 8.1 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 28% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
528
627
727
827
927
1027
1127
1227
1328
1428
1528
1628
1728
1828
1928
2028
2128
2228
2328
2428
2528
2628
2728
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 36% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
123293414
224293412
325303411
426303410
52731338
62831337
72932336
82932336
93032335
103032335
113132325
123232315
133332315
143432305
153532295
163632285
173732274
183832254
193932244
204132234
214232224
224332214
234432204
244533193
254633183
264734173
274834162
284835152
294936142
304936131

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 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 90 minutes over September. Sunrise moves from 5:42 AM to 6:17 AM, and sunset from 6:47 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:426:47
213.05:436:45
313.05:446:43
412.95:456:41
512.95:466:39
612.85:486:37
712.85:496:35
812.75:506:33
912.75:516:31
1012.65:526:29
1112.65:546:28
1212.55:556:26
1312.55:566:24
1412.45:576:22
1512.45:586:20
1612.36:006:18
1712.36:016:16
1812.26:026:14
1912.16:036:12
2012.16:046:10
2112.06:066:08
2212.06:076:06
2311.96:086:04
2411.96:096:02
2511.86:116:00
2611.86:125:58
2711.76:135:56
2811.76:145:54
2911.66:155:53
3011.66:175:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.23 kWh/m².

For context, solar energy here swings from a low near 1.27 kWh/m² to a high of 6.71 kWh/m² in July across the year — September's 4.23 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.4Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.0Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.4Moderate
Planning a trip in September

Is September a good time to visit San Lazzaro?

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
6.7
Beach & pool
4th-best month of the year

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

What to pack for San Lazzaro in September

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

In September, San Lazzaro sees daytime highs around 26°C and nights near 16°C. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

UV index in San Lazzaro 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 San Lazzaro peaks around July 14 at about 8 (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 14UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar5Moderate
Apr7High
May6High
Jun8Very high
Jul9Very high
Aug7Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in San Lazzaro 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 San Lazzaro is worst in March — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1919 µg/m³Sep 1213 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb17Moderate
Mar19Moderate
Apr18Moderate
May16Moderate
Jun16Moderate
Jul14Moderate
Aug14Moderate
Sep13Moderate
Oct15Moderate
Nov14Moderate
Dec16Moderate
Location & terrain

Where is San Lazzaro?

San Lazzaro sits at 44.5°N, 11.4°E, 66 m above sea level, in Italy. The nearest listed city is Bologna, 6.0 km away.

Topography around San Lazzaro

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

Within 3 km, the terrain around San Lazzaro has only modest variations in elevation — a maximum elevation change of 170 m around an average of 72 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 599 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,113 m.

The land around San Lazzaro is covered by trees (33%), artificial surfaces (30%) and cropland (25%) within 3 km, cropland (39%) and trees (31%) within 16 km, and cropland (38%) and trees (36%) within 80 km.

3 km
170 m
16 km
599 m
80 km
2,113 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Bologna 6.0 km · Casalecchio di Reno 11 km · Castel Maggiore 12 km · Zola Predosa 15 km · San Giovanni in Persiceto 26 km · Imola 27 km · Cento 31 km · Vignola 32 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 San Lazzaro (44.4705°, 11.4085°, elevation 66 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. 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).