Arenillas weather in January

In January, Arenillas sees average daytime highs of 28°C and overnight lows near 22°C, with 246 mm of rain across 26.5 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 1% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of January to 12 h 12 min by month's end. Set against the rest of the year, January is Arenillas's 7th-clearest and 9th-windiest month. For the whole year in context, see Arenillas's year-round climate.

Daytime high
28°
4th warmest
Overnight low
22°
9th coldest
Rainfall
246 mm
26.5 wet days
Daylight
12 h 12 min
6:24 AM – 6:35 PM
Cloud cover
85%
7th clearest
Wind
5 km/h
9th windiest
Solar energy
4.73 kWh/m²
Travel score
3.4
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical January day in Arenillas reaches about 28°C in the afternoon and slips back to 22°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, January runs on par with December and on par with February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12822
22822
32822
42822
52822
62922
72922
82922
92922
102922
112922
122922
132922
142922
152922
162922
172922
182922
192922
202922
212822
222822
232822
242822
252822
262822
272822
282823
292823
302823
312823

How January really feels in Arenillas

Once humidity and wind are folded in, January 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

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Arenillas weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 22°24626.512.23.4
Feb29° / 23°36626.312.13.0
Mar29° / 23°46127.9123.1
Apr29° / 23°29825.511.93.3
May28° / 22°19224.711.83.8
Jun27° / 21°8118.511.84.9
Jul26° / 20°5215.611.85.5
Aug26° / 19°309.311.96.4
Sep26° / 20°338.2126.4
Oct27° / 20°4712.312.15.7
Nov27° / 20°6213.312.25.4
Dec28° / 21°12920.412.24.4

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 5% of January, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1694
2793
3694
4694
5694
6694
7694
8694
9694
10694
11694
12694
13694
14694
15694
16694
17793
18793
19793
20793
21793
22793
23793
24694
25694
26694
27694
28595
29496
30496
31496

Chance of precipitation in January

Any precipitation

Arenillas gets around 246 mm of rain over 26.5 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 86% and peaks near 92% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
179
280
381
482
582
683
784
885
985
1086
1187
1287
1388
1488
1588
1688
1787
1887
1987
2087
2187
2287
2387
2487
2588
2688
2789
2890
2990
3091
3192

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
137621
235641
333661
432671
531681
630691
729701
828711
928711
1027730
1127730
1226740
1326740
1426740
1526740
1625750
1725750
1825750
1924760
2024760
2124760
2224760
2323770
2423770
2523770
2622780
2722780
2821781
2921781
3020791
3120791

Wind in January

Winds average 5 km/h in January.

Across January, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 12 h 12 min at the start of January to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over January. Sunrise moves from 6:17 AM to 6:29 AM, and sunset from 6:29 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:176:29
212.26:186:30
312.26:186:30
412.26:196:31
512.26:196:31
612.26:206:32
712.26:206:32
812.26:216:32
912.26:216:33
1012.26:216:33
1112.26:226:33
1212.26:226:34
1312.26:236:34
1412.26:236:34
1512.26:246:35
1612.26:246:35
1712.26:246:35
1812.26:256:36
1912.26:256:36
2012.26:266:36
2112.26:266:36
2212.26:266:37
2312.26:276:37
2412.26:276:37
2512.26:276:37
2612.26:286:38
2712.26:286:38
2812.26:286:38
2912.26:286:38
3012.26:296:38
3112.26:296:38

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.73 kWh/m².

For context, solar energy here swings from a low near 4.58 kWh/m² to a high of 5.51 kWh/m² in September across the year — January's 4.73 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.6Bright
314.6Bright
Planning a trip in January

Hazard calendar for Arenillas

In seasonPeak

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

Arenillas's monsoon runs January–April, when most of the year's rain falls.

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

Is January a good time to visit Arenillas?

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

3.4
Sightseeing
9th-best month of the year
4.1
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Arenillas.

What to pack for Arenillas in January

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

In January, Arenillas sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near Arenillas in January

The nearest coast averages about 26°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 40 km away) is warmest in March at about 27°C and coldest in September near 23°C.

The water stays above 20°C all year — warm enough for a swim any month.

22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar27Warm
Apr26Warm
May26Warm
Jun25Warm
Jul24Refreshing
Aug23Refreshing
Sep23Refreshing
Oct23Refreshing
Nov24Refreshing
Dec25Warm

UV index in Arenillas in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Arenillas peaks around February 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 16 at about 10 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeExtremeFeb 21UV 15Jul 16UV 10
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr12Extreme
May12Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct13Extreme
Nov12Extreme
Dec12Extreme

Air quality in Arenillas 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 Arenillas is worst in December — around 29 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (August, 9 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateDec 1128 µg/m³Aug 219 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb14Moderate
Mar14Moderate
Apr15Moderate
May15Moderate
Jun15Moderate
Jul12Moderate
Aug9Good
Sep10Good
Oct14Moderate
Nov27Moderate
Dec29Moderate
Location & terrain

Where is Arenillas?

Arenillas sits at 3.6°S, 80.1°W, 41 m above sea level, in Ecuador. The nearest listed city is Santa Rosa, 16 km away.

Topography around Arenillas

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

Within 3 km, the terrain around Arenillas has only modest variations in elevation — a maximum elevation change of 134 m around an average of 48 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 507 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,874 m.

The land around Arenillas is covered by trees (41%) and grassland (39%) within 3 km, trees (45%) and grassland (34%) within 16 km, and trees (40%), water (28%) and grassland (23%) within 80 km.

3 km
134 m
16 km
507 m
80 km
3,874 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves
January weather nearby: Santa Rosa 16 km · Huaquillas 20 km · Zarumilla 24 km · Machala 35 km · Pasaje 38 km · Tumbes 42 km · Guabo 43 km · Piñas 45 km

Ecuador travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 43% of US
price level, 2025
GDP per capita
$7,125
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
70%
of population, 2024
Homicide rate
45.7
per 100k, 2023
Road deaths
20.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 466
Religion
Roman Catholic 68%Protestant 19%none 8%other 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 Arenillas (-3.554°, -80.0668°, elevation 41 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).