Grosseto weather in May

In May, Grosseto sees average daytime highs of 21°C and overnight lows near 15°C, with 42 mm of rain across 7 wet days and about 14.4 hours of daylight. It is the 5th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 19°C in the first days to 23°C by the end. The sky is clear or mostly clear about 46% of the time in May, and the air most often feels comfortable.

Daylight stretches from about 13 h 48 min at the start of May to 14 h 54 min by month's end. Set against the rest of the year, May is Grosseto's 5th-clearest and 9th-windiest month. For the whole year in context, see Grosseto's year-round climate.

Daytime high
21°
5th warmest
Overnight low
15°
7th coldest
Rainfall
42 mm
7 wet days
Daylight
14 h 24 min
4:59 AM – 7:25 PM
Cloud cover
45%
5th clearest
Wind
11 km/h
9th windiest
Solar energy
6.43 kWh/m²
Travel score
7.2
out of 10
Air quality
Good
PM2.5 9.3 µg/m³ · 2019

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 19°C in the first days to 23°C by the end.

A typical May day in Grosseto reaches about 21°C in the afternoon and slips back to 15°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 24°C. Set against its neighbours, May runs about 4°C warmer than April and about 4°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
11913
21913
31913
41913
52014
62014
72014
82014
92014
102014
112014
122114
132114
142115
152115
162115
172115
182115
192115
202215
212215
222215
232216
242216
252216
262216
272216
282316
292316
302316
312317

Grosseto weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan12° / 598.39.23.2
Feb12° / 587.910.33.5
Mar14° / 537.611.64.7
Apr17° / 11°538.513.15.8
May21° / 15°42714.47.2
Jun25° / 18°264.515.18.2
Jul28° / 21°152.414.88.0
Aug28° / 21°213.213.77.5
Sep25° / 19°767.612.37.5
Oct20° / 15°1049.910.86.6
Nov16° / 11°12212.29.64.8
Dec13° / 82108.93.5

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35842
45941
56040
66139
76040
86139
96238
106238
116337
126337
136436
146436
156535
166535
176634
186733
196733
206832
216832
226931
236931
247030
257129
267129
277129
287129
297129
307129
317129

Chance of precipitation in May

Any precipitation

Grosseto gets around 42 mm of rain over 7 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 23% and peaks near 31% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
131
231
330
430
529
629
728
827
927
1026
1125
1224
1324
1423
1522
1622
1721
1821
1920
2020
2119
2219
2318
2418
2518
2617
2717
2817
2916
3016
3116

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the comfortable band about 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1673210
2653410
3623620
4603820
5584020
6564130
7534340
8524440
9504550
10484660
11464770
12454880
13434880
14424990
154149100
163949110
173849120
183749130
193649150
203548161
213547171
223447191
233346211
243145221
253044241
262844262
272743292
282542313
292341333
302140354
312038375

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 48 min at the start of May to 14 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over May. Sunrise moves from 5:17 AM to 4:47 AM, and sunset from 7:08 PM to 7:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:177:08
213.95:167:09
313.95:157:10
414.05:137:12
514.05:127:13
614.15:117:14
714.15:097:15
814.15:087:16
914.25:077:17
1014.25:067:18
1114.35:047:19
1214.35:037:21
1314.35:027:22
1414.45:017:23
1514.45:007:24
1614.44:597:25
1714.54:587:26
1814.54:577:27
1914.54:567:28
2014.64:557:29
2114.64:547:30
2214.64:537:31
2314.74:527:32
2414.74:517:33
2514.74:517:34
2614.84:507:35
2714.84:497:36
2814.84:487:37
2914.84:487:38
3014.94:477:38
3114.94:477:39

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.43 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 7.16 kWh/m² in July across the year — May's 6.43 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
36.0Bright
46.0Intense
56.0Intense
66.1Intense
76.1Intense
86.2Intense
96.2Intense
106.2Intense
116.3Intense
126.3Intense
136.3Intense
146.3Intense
156.4Intense
166.4Intense
176.4Intense
186.5Intense
196.5Intense
206.5Intense
216.6Intense
226.6Intense
236.6Intense
246.7Intense
256.7Intense
266.7Intense
276.7Intense
286.7Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in May

Hazard calendar for Grosseto

In seasonPeak

None of Grosseto's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Grosseto's rainy season runs September–February, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Grosseto?

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

7.2
Sightseeing
5th-best month of the year
4.4
Beach & pool
5th-best month of the year

May is one of the better times to visit Grosseto for general sightseeing.

What to pack for Grosseto in May

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

In May, Grosseto sees daytime highs around 21°C and nights near 15°C. Pack sun protection. About 7 days see rain.

sun protection

Sea temperature near Grosseto in May

The nearest coast averages about 18°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 15 km away) is warmest in August at about 25°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 3 to Oct 28 — about 4.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul24Warm
Aug25Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Grosseto in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Grosseto peaks around July 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 9Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr5High
May6High
Jun8Very high
Jul9Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Grosseto?

Grosseto sits at 42.8°N, 11.1°E, 10 m above sea level, in Italy. The nearest listed city is Follonica, 34 km away.

Colle di Val d'ElsaCecinaPoggibonsiRosignano Solvay-CastiglioncelloViterbo

Topography around Grosseto

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

Within 3 km, the terrain around Grosseto has only modest variations in elevation — a maximum elevation change of 21 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 562 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,724 m.

The land around Grosseto is covered by cropland (38%) and artificial surfaces (31%) within 3 km, cropland (36%), trees (28%) and grassland (23%) within 16 km, and water (40%) and trees (33%) within 80 km.

3 km
21 m
16 km
562 m
80 km
1,724 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Follonica 34 km · Piombino 51 km · Siena 64 km · Colle di Val d'Elsa 73 km · Cecina 77 km · Poggibonsi 79 km · Rosignano Solvay-Castiglioncello 89 km · Viterbo 90 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 Grosseto (42.763°, 11.1094°, elevation 10 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).