Ilo weather in May

In May, Ilo sees average daytime highs of 19°C and overnight lows near 16°C, with 0 mm of rain across 0.1 wet days and about 11.2 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 60% of the time in May, and the air most often feels comfortable.

Daylight stretches from about 11 h 24 min at the start of May to 11 hours by month's end. Set against the rest of the year, May is Ilo's 1st-clearest and 6th-windiest month. For the whole year in context, see Ilo's year-round climate.

Daytime high: 19°; 6th warmest
Overnight low: 16°; 6th coldest
Rainfall: 0 mm; 0.1 wet days
Daylight: 11 h 12 min; 6:06 AM – 5:17 PM
Cloud cover: 38%; 1st clearest
Wind: 11 km/h; 6th windiest
Solar energy: 4.89 kWh/m²
Travel score: 7.9; out of 10

Ilo is city in Peru.

Density: 181/km²; people per km²

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

← April Ilo year-round climate June →Best places to visit in May

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 19°C through the month.

A typical May day in Ilo reaches about 19°C in the afternoon and slips back to 16°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 20°C. Set against its neighbours, May runs about 1°C cooler than April and about 2°C warmer than June.

	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)	20	20	20	20	20	20	20	20	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	18	18
Avg low (°C)	17	17	17	17	17	17	17	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15

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

Ilo weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	22° / 20°	4	0.9	12.9	7.8
Feb	23° / 20°	4	1.2	12.6	7.9
Mar	22° / 19°	1	0.4	12.1	8.1
Apr	21° / 18°	0	0.1	11.6	8.1
May	19° / 16°	0	0.1	11.2	7.9
Jun	18° / 15°	0	0.1	11	7.3
Jul	17° / 14°	1	0.4	11.1	6.7
Aug	17° / 13°	1	0.1	11.4	6.7
Sep	17° / 14°	0	0.1	11.9	6.9
Oct	18° / 15°	0	0	12.4	7.3
Nov	19° / 16°	0	0.1	12.8	7.6
Dec	21° / 18°	1	0.2	13	7.7

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 60% of the time in May, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 21%. Skies tend to cloud over 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 (%)	81	81	81	82	82	82	82	82	81	81	81	80	80	80	78	78	78	79	79	78	78	78	78	77	77	77	76	76	76	76	76
Cloudier (%)	19	19	19	18	18	18	18	18	19	19	19	20	20	20	22	22	22	21	21	22	22	22	22	23	23	23	24	24	24	24	24

	Clearer (%)	Cloudier (%)
1	81	19
2	81	19
3	81	19
4	82	18
5	82	18
6	82	18
7	82	18
8	82	18
9	81	19
10	81	19
11	81	19
12	80	20
13	80	20
14	80	20
15	78	22
16	78	22
17	78	22
18	79	21
19	79	21
20	78	22
21	78	22
22	78	22
23	78	22
24	77	23
25	77	23
26	77	23
27	76	24
28	76	24
29	76	24
30	76	24
31	76	24

Chance of precipitation in May

Any precipitation

Ilo gets around 0 mm of rain over 0.1 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 0% and peaks near 1% on the wettest days.

	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 (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1	1	1

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

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 78% 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 (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	2	2	3	3	4	4	5	5	6	6	7	8	8	9
Comfortable (%)	58	60	61	63	64	66	67	69	70	72	73	75	77	77	79	81	82	83	85	85	86	87	88	88	89	89	89	89	88	89	88
Humid (%)	42	40	39	37	36	34	33	31	30	28	27	25	23	22	20	18	17	15	13	12	11	9	8	7	6	5	5	4	4	3	3

	Dry (%)	Comfortable (%)	Humid (%)
1	0	58	42
2	0	60	40
3	0	61	39
4	0	63	37
5	0	64	36
6	0	66	34
7	0	67	33
8	0	69	31
9	0	70	30
10	0	72	28
11	0	73	27
12	0	75	25
13	0	77	23
14	1	77	22
15	1	79	20
16	1	81	18
17	1	82	17
18	2	83	15
19	2	85	13
20	3	85	12
21	3	86	11
22	4	87	9
23	4	88	8
24	5	88	7
25	5	89	6
26	6	89	5
27	6	89	5
28	7	89	4
29	8	88	4
30	8	89	3
31	9	88	3

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 11 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)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11
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	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	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	11	calm
28	11	calm
29	11	calm
30	11	calm
31	11	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 24 min at the start of May to 11 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over May. Sunrise moves from 6:01 AM to 6:12 AM, and sunset from 5:24 PM to 5:14 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)	11.4	11.4	11.3	11.3	11.3	11.3	11.3	11.3	11.3	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.0	11.0	11.0
Sunrise (AM)	6:01	6:02	6:02	6:02	6:03	6:03	6:03	6:04	6:04	6:04	6:05	6:05	6:05	6:06	6:06	6:06	6:07	6:07	6:07	6:08	6:08	6:09	6:09	6:09	6:10	6:10	6:10	6:11	6:11	6:11	6:12
Sunset (PM)	5:24	5:23	5:23	5:22	5:22	5:21	5:21	5:20	5:20	5:19	5:19	5:18	5:18	5:18	5:17	5:17	5:17	5:16	5:16	5:16	5:15	5:15	5:15	5:15	5:15	5:14	5:14	5:14	5:14	5:14	5:14

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.4	6:01	5:24
2	11.4	6:02	5:23
3	11.3	6:02	5:23
4	11.3	6:02	5:22
5	11.3	6:03	5:22
6	11.3	6:03	5:21
7	11.3	6:03	5:21
8	11.3	6:04	5:20
9	11.3	6:04	5:20
10	11.2	6:04	5:19
11	11.2	6:05	5:19
12	11.2	6:05	5:18
13	11.2	6:05	5:18
14	11.2	6:06	5:18
15	11.2	6:06	5:17
16	11.2	6:06	5:17
17	11.2	6:07	5:17
18	11.2	6:07	5:16
19	11.1	6:07	5:16
20	11.1	6:08	5:16
21	11.1	6:08	5:15
22	11.1	6:09	5:15
23	11.1	6:09	5:15
24	11.1	6:09	5:15
25	11.1	6:10	5:15
26	11.1	6:10	5:14
27	11.1	6:10	5:14
28	11.1	6:11	5:14
29	11.0	6:11	5:14
30	11.0	6:11	5:14
31	11.0	6:12	5:14

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.89 kWh/m².

For context, solar energy here swings from a low near 4.21 kWh/m² to a high of 7.35 kWh/m² in December across the year — May's 4.89 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)	5.3	5.3	5.3	5.3	5.2	5.2	5.1	5.1	5.1	5.0	5.0	5.0	5.0	4.9	4.9	4.9	4.8	4.8	4.8	4.8	4.7	4.7	4.7	4.7	4.6	4.6	4.6	4.6	4.5	4.5	4.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.3	Bright
2	5.3	Bright
3	5.3	Bright
4	5.3	Bright
5	5.2	Bright
6	5.2	Bright
7	5.1	Bright
8	5.1	Bright
9	5.1	Bright
10	5.0	Bright
11	5.0	Bright
12	5.0	Bright
13	5.0	Bright
14	4.9	Bright
15	4.9	Bright
16	4.9	Bright
17	4.8	Bright
18	4.8	Bright
19	4.8	Bright
20	4.8	Bright
21	4.7	Bright
22	4.7	Bright
23	4.7	Bright
24	4.7	Bright
25	4.6	Bright
26	4.6	Bright
27	4.6	Bright
28	4.6	Bright
29	4.5	Bright
30	4.5	Bright
31	4.5	Bright

Planning a trip in May

Is May a good time to visit Ilo?

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

7.9

Sightseeing

3rd-best month of the year

3.5

Beach & pool

6th-best month of the year

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

What to pack for Ilo in May

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

In May, Ilo sees daytime highs around 19°C and nights near 16°C. Worth packing: sun protection.

sun protection

Sea temperature near Ilo in May

The nearest coast averages about 19°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in February at about 22°C and coldest in August near 17°C.

It's comfortable for a long swim from Nov 27 to Apr 28 — about 5 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	22	22	22	21	19	19	18	17	17	18	20	21
Comfort	Refreshing	Refreshing	Refreshing	Refreshing	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Refreshing

	Sea temperature (°C)	Comfort
Jan	22	Refreshing
Feb	22	Refreshing
Mar	22	Refreshing
Apr	21	Refreshing
May	19	Cool
Jun	19	Cool
Jul	18	Cool
Aug	17	Cool
Sep	17	Cool
Oct	18	Cool
Nov	20	Cool
Dec	21	Refreshing

UV index in Ilo in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ilo peaks around February 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 7 (very high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	15	16	13	11	9	7	7	10	12	13	13	14
Level	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	16	Extreme
Mar	13	Extreme
Apr	11	Extreme
May	9	Very high
Jun	7	Very high
Jul	7	Very high
Aug	10	Very high
Sep	12	Extreme
Oct	13	Extreme
Nov	13	Extreme
Dec	14	Extreme

Location & terrain

Where is Ilo?

Ilo sits at 17.6°S, 71.3°W, 22 m above sea level, in Peru. The nearest listed city is San Antonio, 64 km away.

Topography around Ilo

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

Within 3 km, the terrain around Ilo has only modest variations in elevation — a maximum elevation change of 192 m around an average of 66 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,476 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,396 m.

The land around Ilo is covered by water (40%), bare terrain (30%) and artificial surfaces (27%) within 3 km, water (51%) and bare terrain (46%) within 16 km, and bare terrain (58%) and water (38%) within 80 km.

3 km

192 m

water 40%

16 km

1,476 m

water 51%

80 km

3,396 m

bare terrain 58%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← April Ilo year-round climate June →Best places to visit in May

May weather nearby: San Antonio 64 km · Moquegua 65 km · Mollendo 98 km · Tacna 123 km · Jacobo Hunter 134 km · Ciudad Satelite 135 km · Arequipa 139 km · Selva Alegre 142 km

Peru travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type A / B / C; 220 V · 60 Hz
Prices: ≈ 51% of US; price level, 2025
GDP per capita: $9,684; 2025
Happiness: 6.0 / 10; World Happiness, 2025
Safe drinking water: 49%; of population, 2024
Homicide rate: 8.6; per 100k, 2021
Road deaths: 13.6; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Moderate; EF EPI 519
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 Ilo (-17.6319°, -71.3411°, elevation 22 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	20	17
2	20	17
3	20	17
4	20	17
5	20	17
6	20	17
7	20	17
8	20	16
9	19	16
10	19	16
11	19	16
12	19	16
13	19	16
14	19	16
15	19	16
16	19	16
17	19	16
18	19	16
19	19	16
20	19	16
21	19	16
22	19	16
23	19	16
24	19	16
25	19	15
26	19	15
27	19	15
28	19	15
29	19	15
30	18	15
31	18	15

	Clearer (%)	Cloudier (%)
1	81	19
2	81	19
3	81	19
4	82	18
5	82	18
6	82	18
7	82	18
8	82	18
9	81	19
10	81	19
11	81	19
12	80	20
13	80	20
14	80	20
15	78	22
16	78	22
17	78	22
18	79	21
19	79	21
20	78	22
21	78	22
22	78	22
23	78	22
24	77	23
25	77	23
26	77	23
27	76	24
28	76	24
29	76	24
30	76	24
31	76	24

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

	Dry (%)	Comfortable (%)	Humid (%)
1	0	58	42
2	0	60	40
3	0	61	39
4	0	63	37
5	0	64	36
6	0	66	34
7	0	67	33
8	0	69	31
9	0	70	30
10	0	72	28
11	0	73	27
12	0	75	25
13	0	77	23
14	1	77	22
15	1	79	20
16	1	81	18
17	1	82	17
18	2	83	15
19	2	85	13
20	3	85	12
21	3	86	11
22	4	87	9
23	4	88	8
24	5	88	7
25	5	89	6
26	6	89	5
27	6	89	5
28	7	89	4
29	8	88	4
30	8	89	3
31	9	88	3

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

	Clearer (%)	Cloudier (%)
1	81	19
2	81	19
3	81	19
4	82	18
5	82	18
6	82	18
7	82	18
8	82	18
9	81	19
10	81	19
11	81	19
12	80	20
13	80	20
14	80	20
15	78	22
16	78	22
17	78	22
18	79	21
19	79	21
20	78	22
21	78	22
22	78	22
23	78	22
24	77	23
25	77	23
26	77	23
27	76	24
28	76	24
29	76	24
30	76	24
31	76	24

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

	Dry (%)	Comfortable (%)	Humid (%)
1	0	58	42
2	0	60	40
3	0	61	39
4	0	63	37
5	0	64	36
6	0	66	34
7	0	67	33
8	0	69	31
9	0	70	30
10	0	72	28
11	0	73	27
12	0	75	25
13	0	77	23
14	1	77	22
15	1	79	20
16	1	81	18
17	1	82	17
18	2	83	15
19	2	85	13
20	3	85	12
21	3	86	11
22	4	87	9
23	4	88	8
24	5	88	7
25	5	89	6
26	6	89	5
27	6	89	5
28	7	89	4
29	8	88	4
30	8	89	3
31	9	88	3

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

	Clearer (%)	Cloudier (%)
1	81	19
2	81	19
3	81	19
4	82	18
5	82	18
6	82	18
7	82	18
8	82	18
9	81	19
10	81	19
11	81	19
12	80	20
13	80	20
14	80	20
15	78	22
16	78	22
17	78	22
18	79	21
19	79	21
20	78	22
21	78	22
22	78	22
23	78	22
24	77	23
25	77	23
26	77	23
27	76	24
28	76	24
29	76	24
30	76	24
31	76	24

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

	Dry (%)	Comfortable (%)	Humid (%)
1	0	58	42
2	0	60	40
3	0	61	39
4	0	63	37
5	0	64	36
6	0	66	34
7	0	67	33
8	0	69	31
9	0	70	30
10	0	72	28
11	0	73	27
12	0	75	25
13	0	77	23
14	1	77	22
15	1	79	20
16	1	81	18
17	1	82	17
18	2	83	15
19	2	85	13
20	3	85	12
21	3	86	11
22	4	87	9
23	4	88	8
24	5	88	7
25	5	89	6
26	6	89	5
27	6	89	5
28	7	89	4
29	8	88	4
30	8	89	3
31	9	88	3