Nettuno weather in January

In January, Nettuno sees average daytime highs of 12°C and overnight lows near 7°C, with 86 mm of precipitation across 10.7 wet days and about 9.3 hours of daylight. It is the 12th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 12°C through the month. The sky is clear or mostly clear about 41% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 hours at the start of January to 9 h 48 min by month's end. Set against the rest of the year, January is Nettuno's 11th-clearest and 5th-windiest month. For the whole year in context, see Nettuno's year-round climate.

Daytime high: 12°; 12th warmest
Overnight low: 7°; 2nd coldest
Precipitation: 86 mm; 10.7 wet days
Daylight: 9 h 18 min; 7:39 AM – 4:58 PM
Cloud cover: 52%; 11th clearest
Wind: 11 km/h; 5th windiest
Solar energy: 1.95 kWh/m²
Travel score: 3.1; out of 10

Nettuno is chief town of the homonym municipality.

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

← December Nettuno year-round climate February →Best places to visit in January

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 12°C through the month.

A typical January day in Nettuno reaches about 12°C in the afternoon and slips back to 7°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 14°C. Set against its neighbours, January runs about 1°C cooler than December and on par with February.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Avg low (°C)	8	8	8	8	8	8	8	8	8	8	8	8	8	8	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7

	Avg high (°C)	Avg low (°C)
1	12	8
2	12	8
3	12	8
4	12	8
5	12	8
6	12	8
7	12	8
8	12	8
9	12	8
10	12	8
11	12	8
12	12	8
13	12	8
14	12	8
15	12	7
16	12	7
17	12	7
18	12	7
19	12	7
20	12	7
21	12	7
22	12	7
23	12	7
24	12	7
25	12	7
26	12	7
27	12	7
28	12	7
29	12	7
30	12	7
31	12	7

Nettuno weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	12° / 7°	86	10.7	9.3	3.1
Feb	12° / 7°	83	10.3	10.3	3.2
Mar	14° / 9°	81	9.9	11.7	4.2
Apr	16° / 11°	74	10.5	13.1	5.2
May	20° / 15°	53	8.2	14.3	6.9
Jun	24° / 19°	29	5.1	14.9	8.2
Jul	27° / 22°	19	3.3	14.7	8.4
Aug	27° / 22°	22	3.9	13.7	8.1
Sep	24° / 19°	91	9.2	12.3	7.3
Oct	20° / 16°	131	11.1	10.9	6.4
Nov	16° / 12°	160	13.8	9.7	4.7
Dec	13° / 9°	121	12.3	9.1	3.5

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 14% of January, with mostly cloudy or overcast conditions the remaining 45%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	56	55	56	56	56	56	57	57	56	56	56	56	55	55	55	55	55	55	54	54	54	54	53	53	53	53	53	54	54	55	56
Cloudier (%)	44	45	44	44	44	44	43	43	44	44	44	44	45	45	45	45	45	45	46	46	46	46	47	47	47	47	47	46	46	45	44

	Clearer (%)	Cloudier (%)
1	56	44
2	55	45
3	56	44
4	56	44
5	56	44
6	56	44
7	57	43
8	57	43
9	56	44
10	56	44
11	56	44
12	56	44
13	55	45
14	55	45
15	55	45
16	55	45
17	55	45
18	55	45
19	54	46
20	54	46
21	54	46
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	54	46
29	54	46
30	55	45
31	56	44

Chance of precipitation in January

Any precipitation

Nettuno gets around 86 mm of rain and snow over 10.7 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 35% and peaks near 38% on the wettest days, and about 0 day brings snow.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	35	35	34	33	33	32	32	32	31	31	31	32	32	32	33	33	34	34	35	35	36	36	37	37	37	38	38	38	38	38	38

	Rain chance (%)
1	35
2	35
3	34
4	33
5	33
6	32
7	32
8	32
9	31
10	31
11	31
12	32
13	32
14	32
15	33
16	33
17	34
18	34
19	35
20	35
21	36
22	36
23	37
24	37
25	37
26	38
27	38
28	38
29	38
30	38
31	38

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

Wind in January

Winds average 11 km/h in January.

Across January, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	12	12	12	12	12	12	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12
Feels	light breeze	light breeze	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	12	light breeze
2	12	light breeze
3	12	calm
4	12	calm
5	12	calm
6	12	calm
7	11	calm
8	11	calm
9	11	calm
10	11	calm
11	11	calm
12	11	calm
13	11	calm
14	11	calm
15	11	calm
16	11	calm
17	11	calm
18	11	calm
19	11	calm
20	11	calm
21	11	calm
22	11	calm
23	11	calm
24	11	calm
25	11	calm
26	11	calm
27	12	calm
28	12	calm
29	12	calm
30	12	calm
31	12	calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 hours at the start of January to 9 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over January. Sunrise moves from 7:41 AM to 7:30 AM, and sunset from 4:44 PM to 5:16 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	9.0	9.1	9.1	9.1	9.1	9.1	9.1	9.1	9.2	9.2	9.2	9.2	9.2	9.3	9.3	9.3	9.3	9.4	9.4	9.4	9.4	9.5	9.5	9.5	9.6	9.6	9.6	9.7	9.7	9.7	9.8
Sunrise (AM)	7:41	7:41	7:41	7:41	7:41	7:41	7:41	7:41	7:41	7:41	7:41	7:40	7:40	7:40	7:40	7:39	7:39	7:38	7:38	7:37	7:37	7:36	7:36	7:35	7:34	7:34	7:33	7:32	7:31	7:31	7:30
Sunset (PM)	4:44	4:45	4:46	4:46	4:47	4:48	4:49	4:50	4:51	4:52	4:53	4:54	4:55	4:56	4:57	4:58	4:59	5:00	5:01	5:02	5:04	5:05	5:06	5:07	5:08	5:09	5:11	5:12	5:13	5:14	5:16

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.0	7:41	4:44
2	9.1	7:41	4:45
3	9.1	7:41	4:46
4	9.1	7:41	4:46
5	9.1	7:41	4:47
6	9.1	7:41	4:48
7	9.1	7:41	4:49
8	9.1	7:41	4:50
9	9.2	7:41	4:51
10	9.2	7:41	4:52
11	9.2	7:41	4:53
12	9.2	7:40	4:54
13	9.2	7:40	4:55
14	9.3	7:40	4:56
15	9.3	7:40	4:57
16	9.3	7:39	4:58
17	9.3	7:39	4:59
18	9.4	7:38	5:00
19	9.4	7:38	5:01
20	9.4	7:37	5:02
21	9.4	7:37	5:04
22	9.5	7:36	5:05
23	9.5	7:36	5:06
24	9.5	7:35	5:07
25	9.6	7:34	5:08
26	9.6	7:34	5:09
27	9.6	7:33	5:11
28	9.7	7:32	5:12
29	9.7	7:31	5:13
30	9.7	7:31	5:14
31	9.8	7:30	5:16

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1.95 kWh/m².

For context, solar energy here swings from a low near 1.68 kWh/m² to a high of 7.14 kWh/m² in July across the year — January's 1.95 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	1.7	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.9	1.9	1.9	1.9	1.9	1.9	1.9	2.0	2.0	2.0	2.0	2.0	2.0	2.1	2.1	2.1	2.1	2.2	2.2	2.2	2.3	2.3
Level	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	1.7	Dim
2	1.8	Dim
3	1.8	Dim
4	1.8	Dim
5	1.8	Dim
6	1.8	Dim
7	1.8	Dim
8	1.8	Dim
9	1.8	Dim
10	1.9	Dim
11	1.9	Dim
12	1.9	Dim
13	1.9	Dim
14	1.9	Dim
15	1.9	Dim
16	1.9	Dim
17	2.0	Dim
18	2.0	Dim
19	2.0	Dim
20	2.0	Moderate
21	2.0	Moderate
22	2.0	Moderate
23	2.1	Moderate
24	2.1	Moderate
25	2.1	Moderate
26	2.1	Moderate
27	2.2	Moderate
28	2.2	Moderate
29	2.2	Moderate
30	2.3	Moderate
31	2.3	Moderate

Planning a trip in January

Hazard calendar for Nettuno

In seasonPeak

In January, Nettuno sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

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

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is January a good time to visit Nettuno?

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

3.1

Sightseeing

12th-best month of the year

0.0

Beach & pool

11th-best month of the year

January is a weaker month for outdoor sightseeing in Nettuno.

What to pack for Nettuno in January

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

In January, Nettuno sees daytime highs around 12°C and nights near 7°C. Pack a warm layer. Worth having: rain gear. About 11 days see rain.

a warm layerrain gear

Sea temperature near Nettuno in January

The nearest coast averages about 15°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from May 30 to Nov 2 — about 5.2 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	15	14	14	16	18	22	25	26	24	22	19	17
Comfort	Bracing	Bracing	Bracing	Cool	Cool	Refreshing	Warm	Warm	Refreshing	Refreshing	Cool	Cool

	Sea temperature (°C)	Comfort
Jan	15	Bracing
Feb	14	Bracing
Mar	14	Bracing
Apr	16	Cool
May	18	Cool
Jun	22	Refreshing
Jul	25	Warm
Aug	26	Warm
Sep	24	Refreshing
Oct	22	Refreshing
Nov	19	Cool
Dec	17	Cool

UV index in Nettuno in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nettuno peaks around July 15 at about 10 (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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	3	5	4	7	9	10	8	6	4	2	1
Level	Low	Moderate	Moderate	Moderate	High	Very high	Very high	Very high	High	Moderate	Moderate	Low

	UV index (midday)	Level
Jan	1	Low
Feb	3	Moderate
Mar	5	Moderate
Apr	4	Moderate
May	7	High
Jun	9	Very high
Jul	10	Very high
Aug	8	Very high
Sep	6	High
Oct	4	Moderate
Nov	2	Moderate
Dec	1	Low

Location & terrain

Where is Nettuno?

Nettuno sits at 41.5°N, 12.7°E, 11 m above sea level, in Italy. The nearest listed city is Anzio, 4.0 km away.

Topography around Nettuno

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

Within 3 km, the terrain around Nettuno has only modest variations in elevation — a maximum elevation change of 61 m around an average of 16 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 95 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,137 m.

The land around Nettuno is covered by water (38%) and artificial surfaces (24%) within 3 km, water (53%) within 16 km, and water (45%) and trees (32%) within 80 km.

3 km

61 m

water 38%

16 km

95 m

water 53%

80 km

2,137 m

water 45%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← December Nettuno year-round climate February →Best places to visit in January

January weather nearby: Anzio 4.0 km · Marina di Ardea-Tor San Lorenzo 15 km · Aprilia 15 km · Ardea 19 km · Latina 20 km · Cisterna di Latina 20 km · Torvaianica 25 km · Velletri 27 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

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 Nettuno (41.4579°, 12.6639°, elevation 11 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).

	Avg high (°C)	Avg low (°C)
1	12	8
2	12	8
3	12	8
4	12	8
5	12	8
6	12	8
7	12	8
8	12	8
9	12	8
10	12	8
11	12	8
12	12	8
13	12	8
14	12	8
15	12	7
16	12	7
17	12	7
18	12	7
19	12	7
20	12	7
21	12	7
22	12	7
23	12	7
24	12	7
25	12	7
26	12	7
27	12	7
28	12	7
29	12	7
30	12	7
31	12	7

	Clearer (%)	Cloudier (%)
1	56	44
2	55	45
3	56	44
4	56	44
5	56	44
6	56	44
7	57	43
8	57	43
9	56	44
10	56	44
11	56	44
12	56	44
13	55	45
14	55	45
15	55	45
16	55	45
17	55	45
18	55	45
19	54	46
20	54	46
21	54	46
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	54	46
29	54	46
30	55	45
31	56	44

	Rain chance (%)
1	35
2	35
3	34
4	33
5	33
6	32
7	32
8	32
9	31
10	31
11	31
12	32
13	32
14	32
15	33
16	33
17	34
18	34
19	35
20	35
21	36
22	36
23	37
24	37
25	37
26	38
27	38
28	38
29	38
30	38
31	38

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°C)	Avg low (°C)
1	12	8
2	12	8
3	12	8
4	12	8
5	12	8
6	12	8
7	12	8
8	12	8
9	12	8
10	12	8
11	12	8
12	12	8
13	12	8
14	12	8
15	12	7
16	12	7
17	12	7
18	12	7
19	12	7
20	12	7
21	12	7
22	12	7
23	12	7
24	12	7
25	12	7
26	12	7
27	12	7
28	12	7
29	12	7
30	12	7
31	12	7

	Clearer (%)	Cloudier (%)
1	56	44
2	55	45
3	56	44
4	56	44
5	56	44
6	56	44
7	57	43
8	57	43
9	56	44
10	56	44
11	56	44
12	56	44
13	55	45
14	55	45
15	55	45
16	55	45
17	55	45
18	55	45
19	54	46
20	54	46
21	54	46
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	54	46
29	54	46
30	55	45
31	56	44

	Rain chance (%)
1	35
2	35
3	34
4	33
5	33
6	32
7	32
8	32
9	31
10	31
11	31
12	32
13	32
14	32
15	33
16	33
17	34
18	34
19	35
20	35
21	36
22	36
23	37
24	37
25	37
26	38
27	38
28	38
29	38
30	38
31	38

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°C)	Avg low (°C)
1	12	8
2	12	8
3	12	8
4	12	8
5	12	8
6	12	8
7	12	8
8	12	8
9	12	8
10	12	8
11	12	8
12	12	8
13	12	8
14	12	8
15	12	7
16	12	7
17	12	7
18	12	7
19	12	7
20	12	7
21	12	7
22	12	7
23	12	7
24	12	7
25	12	7
26	12	7
27	12	7
28	12	7
29	12	7
30	12	7
31	12	7

	Clearer (%)	Cloudier (%)
1	56	44
2	55	45
3	56	44
4	56	44
5	56	44
6	56	44
7	57	43
8	57	43
9	56	44
10	56	44
11	56	44
12	56	44
13	55	45
14	55	45
15	55	45
16	55	45
17	55	45
18	55	45
19	54	46
20	54	46
21	54	46
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	54	46
29	54	46
30	55	45
31	56	44

	Rain chance (%)
1	35
2	35
3	34
4	33
5	33
6	32
7	32
8	32
9	31
10	31
11	31
12	32
13	32
14	32
15	33
16	33
17	34
18	34
19	35
20	35
21	36
22	36
23	37
24	37
25	37
26	38
27	38
28	38
29	38
30	38
31	38

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0