Keratsíni weather in January

In January, Keratsíni sees average daytime highs of 12°C and overnight lows near 6°C, with 55 mm of precipitation across 7.9 wet days and about 9.7 hours of daylight. It is the 12th-warmest and 2nd-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 34% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 24 min at the start of January to 10 hours by month's end. Set against the rest of the year, January is Keratsíni's 11th-clearest and 4th-windiest month. For the whole year in context, see Keratsíni's year-round climate.

Daytime high
12°
12th warmest
Overnight low
1st coldest
Precipitation
55 mm
7.9 wet days
Daylight
9 h 36 min
7:46 AM – 5:24 PM
Cloud cover
56%
11th clearest
Wind
10 km/h
4th windiest
Solar energy
2.23 kWh/m²
Travel score
3.3
out of 10

Keratsíni is suburb of Piraeus, Attica, Greece.

Density
10,140/km²
people per km²
Founded
1928

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

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 Keratsíni reaches about 12°C in the afternoon and slips back to 6°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 16°C. Set against its neighbours, January runs about 1°C cooler than December and about 1°C cooler than February.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
1127
2127
3126
4126
5126
6126
7126
8126
9126
10126
11126
12126
13126
14126
15126
16126
17126
18126
19126
20126
21126
22126
23126
24126
25126
26126
27126
28126
29126
30126
31126

Keratsíni weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan12° / 557.90.69.73.3
Feb13° / 487.30.610.53.8
Mar15° / 526.70.211.75.2
Apr19° / 11°285.10137.1
May24° / 16°224.80148.1
Jun29° / 20°102.3014.66.9
Jul32° / 22°51.1014.45.7
Aug31° / 23°41.2013.55.9
Sep28° / 19°172.8012.37.8
Oct23° / 15°314.40117.9
Nov17° / 11°496.809.96.1
Dec13° / 618.10.49.43.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 17% of January, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25248
35347
45347
55446
65347
75347
85347
95446
105347
115347
125248
135149
145050
155050
164951
174951
184951
194852
204951
214951
224951
234951
245050
255050
265050
275050
285050
295149
305149
315248

Chance of precipitation in January

Any precipitationSnow

Keratsíni gets around 55 mm of rain and snow over 7.9 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 25% and peaks near 27% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1273
2273
3273
4263
5263
6252
7252
8242
9242
10232
11232
12232
13231
14231
15241
16241
17251
18251
19251
20261
21262
22262
23262
24272
25272
26272
27273
28273
29273
30273
31273

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.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in January

Winds average 10 km/h in January.

Across January, 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.

051015151015202531
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
3110calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 24 min at the start of January to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over January. Sunrise moves from 7:46 AM to 7:38 AM, and sunset from 5:11 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.47:465:11
29.47:475:12
39.47:475:12
49.47:475:13
59.57:475:14
69.57:475:15
79.57:475:16
89.57:475:17
99.57:475:17
109.57:475:18
119.57:475:19
129.67:475:20
139.67:465:21
149.67:465:22
159.67:465:23
169.67:465:24
179.77:455:25
189.77:455:26
199.77:455:27
209.77:445:28
219.87:445:29
229.87:435:30
239.87:435:31
249.87:425:32
259.97:425:33
269.97:415:34
279.97:415:35
289.97:405:36
2910.07:395:38
3010.07:395:39
3110.07:385:40

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.23 kWh/m².

For context, solar energy here swings from a low near 1.86 kWh/m² to a high of 7.44 kWh/m² in June across the year — January's 2.23 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.0Dim
22.0Dim
32.0Dim
42.0Moderate
52.0Moderate
62.0Moderate
72.1Moderate
82.1Moderate
92.1Moderate
102.1Moderate
112.1Moderate
122.1Moderate
132.2Moderate
142.2Moderate
152.2Moderate
162.2Moderate
172.2Moderate
182.3Moderate
192.3Moderate
202.3Moderate
212.3Moderate
222.3Moderate
232.4Moderate
242.4Moderate
252.4Moderate
262.4Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.6Moderate
312.6Moderate
Planning a trip in January

Is January a good time to visit Keratsíni?

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

3.3
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 Keratsíni.

What to pack for Keratsíni in January

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

In January, Keratsíni sees daytime highs around 12°C and nights near 6°C. Pack a warm layer. About 8 days see rain.

a warm layer

Sea temperature near Keratsíni 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 15°C.

It's comfortable for a long swim from May 28 to Nov 16 — about 5.7 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb15Bracing
Mar15Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Keratsíni in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Keratsíni peaks around July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateJul 13UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7Very high
May7High
Jun9Very high
Jul9Very high
Aug9Very high
Sep7Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Keratsíni in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Keratsíni is worst in August — around 21 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodAug 1221 µg/m³Dec 149 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar15Moderate
Apr15Moderate
May14Moderate
Jun12Good
Jul18Moderate
Aug21Moderate
Sep11Good
Oct10Good
Nov10Good
Dec8Good
Location & terrain

Where is Keratsíni?

Keratsíni sits at 38.0°N, 23.6°E, 40 m above sea level, in Greece. The nearest listed city is Níkaia, 3.0 km away.

Topography around Keratsíni

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

Within 3 km, the terrain around Keratsíni has significant variations in elevation — a maximum elevation change of 358 m around an average of 69 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 831 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,724 m.

The land around Keratsíni is covered by artificial surfaces (57%) within 3 km, water (40%) and artificial surfaces (32%) within 16 km, and water (48%) and trees (22%) within 80 km.

3 km
358 m
16 km
831 m
80 km
1,724 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Níkaia 3.0 km · Piraeus 3.0 km · Korydallós 3.0 km · Agios Ioannis Rentis 4.0 km · Pérama 4.0 km · Agía Varvára 5.0 km · Moskháton 5.0 km · Aigáleo 6.0 km

Greece travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 60% of US
price level, 2025
GDP per capita
$26,948
2025
Happiness
5.7 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
8.3
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 592
Religion
other 3%Muslim 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 Keratsíni (37.9625°, 23.6197°, elevation 40 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).