Custoias weather in January

In January, Custoias sees average daytime highs of 10°C and overnight lows near 3°C, with 62 mm of precipitation across 8.7 wet days and about 9.4 hours of daylight. It is the 12th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 10°C through the month. The sky is clear or mostly clear about 27% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 06 min at the start of January to 9 h 48 min by month's end. Set against the rest of the year, January is Custoias's 11th-clearest and 8th-windiest month. For the whole year in context, see Custoias's year-round climate.

Daytime high: 10°; 12th warmest
Overnight low: 3°; 1st coldest
Precipitation: 62 mm; 8.7 wet days
Daylight: 9 h 18 min; 7:58 AM – 5:19 PM
Cloud cover: 64%; 11th clearest
Wind: 8 km/h; 8th windiest
Solar energy: 1.84 kWh/m²
Travel score: 2.3; out of 10

Custoias is human settlement in Portugal.

Air quality: Good; PM10 27.6 µg/m³ · 2010

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

← December Custoias 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 10°C through the month.

A typical January day in Custoias reaches about 10°C in the afternoon and slips back to 3°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 13°C. Set against its neighbours, January runs on par with December and about 2°C cooler than 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)	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	11	11	11	11
Avg low (°C)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3

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

Custoias weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 4th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	10° / 3°	62	8.7	9.4	2.3
Feb	12° / 3°	43	6.6	10.4	3.5
Mar	15° / 5°	49	7.9	11.7	4.9
Apr	17° / 7°	54	9.8	13.1	5.6
May	21° / 10°	49	9.2	14.3	6.7
Jun	26° / 13°	20	4.8	14.9	7.8
Jul	29° / 15°	12	2.6	14.7	7.1
Aug	29° / 15°	13	3.4	13.6	7.1
Sep	25° / 13°	34	4.6	12.3	7.9
Oct	19° / 10°	83	9.3	10.9	6.3
Nov	13° / 6°	69	9.2	9.7	3.9
Dec	10° / 4°	68	8.3	9.1	2.5

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to open up as the month goes on.

	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 (%)	36	36	36	36	36	38	37	38	38	39	39	40	41	41	42	42	42	43	44	45	45	44	45	45	46	45	45	46	46	45	45
Cloudier (%)	64	64	64	64	64	62	63	62	62	61	61	60	59	59	58	58	58	57	56	55	55	56	55	55	54	55	55	54	54	55	55

	Clearer (%)	Cloudier (%)
1	36	64
2	36	64
3	36	64
4	36	64
5	36	64
6	38	62
7	37	63
8	38	62
9	38	62
10	39	61
11	39	61
12	40	60
13	41	59
14	41	59
15	42	58
16	42	58
17	42	58
18	43	57
19	44	56
20	45	55
21	45	55
22	44	56
23	45	55
24	45	55
25	46	54
26	45	55
27	45	55
28	46	54
29	46	54
30	45	55
31	45	55

Chance of precipitation in January

Any precipitationSnow

Custoias gets around 62 mm of rain and snow over 8.7 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 28% and peaks near 31% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

	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 (%)	31	31	31	31	31	31	31	30	30	30	30	30	29	29	29	29	28	28	27	27	27	27	26	26	26	25	25	25	25	24	24
Snow chance (%)	2	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1

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

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 (%)	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	100	100

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

Wind in January

Winds average 8 km/h in January.

Across January, daily wind ranges from about 8 km/h on the calmest days to 9 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)	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	9	9	9	9	9	9	9	9	9
Feels	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	calm	calm

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

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 06 min 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 42 minutes over January. Sunrise moves from 8:00 AM to 7:49 AM, and sunset from 5:05 PM to 5:36 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)	9.1	9.1	9.1	9.1	9.1	9.2	9.2	9.2	9.2	9.2	9.2	9.3	9.3	9.3	9.3	9.3	9.4	9.4	9.4	9.5	9.5	9.5	9.5	9.6	9.6	9.6	9.7	9.7	9.7	9.8	9.8
Sunrise (AM)	8:00	8:00	8:00	8:00	8:00	8:00	8:00	8:00	8:00	8:00	8:00	7:59	7:59	7:59	7:58	7:58	7:58	7:57	7:57	7:56	7:56	7:55	7:55	7:54	7:53	7:53	7:52	7:51	7:51	7:50	7:49
Sunset (PM)	5:05	5:06	5:07	5:07	5:08	5:09	5:10	5:11	5:12	5:13	5:14	5:15	5:16	5:17	5:18	5:19	5:20	5:21	5:22	5:23	5:25	5:26	5:27	5:28	5:29	5:30	5:32	5:33	5:34	5:35	5:36

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

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1.84 kWh/m².

For context, solar energy here swings from a low near 1.57 kWh/m² to a high of 7.49 kWh/m² in July across the year — January's 1.84 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)	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.7	1.7	1.7	1.7	1.8	1.8	1.8	1.8	1.9	1.9	1.9	2.0	2.0	2.0	2.1	2.1	2.1	2.2	2.2	2.3	2.3	2.3
Level	Dim	Dim	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

	Solar energy (kWh/m²)	Level
1	1.6	Dim
2	1.6	Dim
3	1.6	Dim
4	1.6	Dim
5	1.6	Dim
6	1.6	Dim
7	1.6	Dim
8	1.6	Dim
9	1.6	Dim
10	1.7	Dim
11	1.7	Dim
12	1.7	Dim
13	1.7	Dim
14	1.8	Dim
15	1.8	Dim
16	1.8	Dim
17	1.8	Dim
18	1.9	Dim
19	1.9	Dim
20	1.9	Dim
21	2.0	Dim
22	2.0	Moderate
23	2.0	Moderate
24	2.1	Moderate
25	2.1	Moderate
26	2.1	Moderate
27	2.2	Moderate
28	2.2	Moderate
29	2.3	Moderate
30	2.3	Moderate
31	2.3	Moderate

Planning a trip in January

Is January a good time to visit Custoias?

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

2.3

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 Custoias.

What to pack for Custoias in January

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

In January, Custoias sees daytime highs around 10°C and nights near 3°C. Pack a warm layer. Worth having: rain gear. About 9 days see rain.

a warm layerrain gear

UV index in Custoias 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 Custoias peaks around July 12 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (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)	2	3	5	6	7	9	9	9	6	5	2	2
Level	Low	Moderate	High	High	High	Very high	Very high	Very high	High	Moderate	Moderate	Low

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

Air quality in Custoias 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 Custoias is worst in August — around 22 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (November, 7 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	10	10	13	11	8	9	12	22	18	13	7	7
Level	Good	Good	Moderate	Good	Good	Good	Good	Moderate	Moderate	Moderate	Good	Good

	PM2.5 (µg/m³)	Level
Jan	10	Good
Feb	10	Good
Mar	13	Moderate
Apr	11	Good
May	8	Good
Jun	9	Good
Jul	12	Good
Aug	22	Moderate
Sep	18	Moderate
Oct	13	Moderate
Nov	7	Good
Dec	7	Good

Location & terrain

Where is Custoias?

Custoias sits at 41.1°N, 7.3°W, 569 m above sea level, in Portugal. The nearest listed city is Vila Nova de Foz Côa, 15 km away.

Topography around Custoias

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

Within 3 km, the terrain around Custoias has large variations in elevation — a maximum elevation change of 671 m around an average of 479 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 921 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,573 m.

The land around Custoias is covered by shrubs (40%), grassland (30%) and trees (29%) within 3 km, grassland (44%), trees (26%) and shrubs (23%) within 16 km, and grassland (58%) and trees (30%) within 80 km.

3 km

671 m

shrubs 40%

16 km

921 m

grassland 44%

80 km

1,573 m

grassland 58%

treesshrubsgrasslandcroplandartificial surfaceswater

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

January weather nearby: Vila Nova de Foz Côa 15 km · Vila Real 41 km · Baião 60 km · Sequeira 62 km · Guarda 63 km · Viseu 70 km · Chaves 72 km · Cabeceiras de Basto 72 km

Portugal travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / E / F; 230 V · 50 Hz
Prices: ≈ 60% of US; price level, 2025
GDP per capita: $32,082; 2025
Happiness: 6.0 / 10; World Happiness, 2025
Safe drinking water: 95%; of population, 2024
Homicide rate: 0.7; per 100k, 2022
Road deaths: 8.2; per 100k/yr, 2019
Income group: High; World Bank
English: Very high; EF EPI 612
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 Custoias (41.1053°, -7.321°, elevation 569 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).

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

	Clearer (%)	Cloudier (%)
1	36	64
2	36	64
3	36	64
4	36	64
5	36	64
6	38	62
7	37	63
8	38	62
9	38	62
10	39	61
11	39	61
12	40	60
13	41	59
14	41	59
15	42	58
16	42	58
17	42	58
18	43	57
19	44	56
20	45	55
21	45	55
22	44	56
23	45	55
24	45	55
25	46	54
26	45	55
27	45	55
28	46	54
29	46	54
30	45	55
31	45	55

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

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

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

	Clearer (%)	Cloudier (%)
1	36	64
2	36	64
3	36	64
4	36	64
5	36	64
6	38	62
7	37	63
8	38	62
9	38	62
10	39	61
11	39	61
12	40	60
13	41	59
14	41	59
15	42	58
16	42	58
17	42	58
18	43	57
19	44	56
20	45	55
21	45	55
22	44	56
23	45	55
24	45	55
25	46	54
26	45	55
27	45	55
28	46	54
29	46	54
30	45	55
31	45	55

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

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

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

	Clearer (%)	Cloudier (%)
1	36	64
2	36	64
3	36	64
4	36	64
5	36	64
6	38	62
7	37	63
8	38	62
9	38	62
10	39	61
11	39	61
12	40	60
13	41	59
14	41	59
15	42	58
16	42	58
17	42	58
18	43	57
19	44	56
20	45	55
21	45	55
22	44	56
23	45	55
24	45	55
25	46	54
26	45	55
27	45	55
28	46	54
29	46	54
30	45	55
31	45	55

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

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