San Isidro weather in April

In April, San Isidro sees average daytime highs of 21°C and overnight lows near 11°C, with 65 mm of precipitation across 9.7 wet days and about 11.3 hours of daylight. It is the 8th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 20°C by the end. The sky is clear or mostly clear about 39% of the time in April, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of April to 11 hours by month's end. Set against the rest of the year, April is San Isidro's 8th-clearest and 10th-windiest month. For the whole year in context, see San Isidro's year-round climate.

Daytime high: 21°; 8th warmest
Overnight low: 11°; 6th coldest
Precipitation: 65 mm; 9.7 wet days
Daylight: 11 h 18 min; 7:44 AM – 7:03 PM
Cloud cover: 52%; 8th clearest
Wind: 7 km/h; 10th windiest
Solar energy: 4.07 kWh/m²
Travel score: 6.6; out of 10

San Isidro is city in Valle Viejo Department, Catamarca Province, Argentina.

Founded: 1698

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

← March San Isidro year-round climate May →Best places to visit in April

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 22°C in the first days to 20°C by the end.

A typical April day in San Isidro reaches about 21°C in the afternoon and slips back to 11°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 26°C. Set against its neighbours, April runs about 2°C cooler than March and about 3°C warmer than May.

	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
Avg high (°C)	22	22	22	22	22	22	22	22	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	20	20	20	20	20	20	20
Avg low (°C)	13	13	13	13	12	12	12	12	12	12	12	12	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10	9

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

San Isidro weather by month

How April compares with the rest of the year at a glance. April is the 8th-warmest and 7th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	26° / 17°	167	16.7	0	13.6	5.7
Feb	25° / 16°	117	13.7	0	13	6.1
Mar	23° / 15°	109	13.2	0	12.2	6.4
Apr	21° / 11°	65	9.7	0.2	11.3	6.6
May	18° / 7°	37	6.9	0.2	10.6	6.5
Jun	17° / 4°	20	4.1	0.4	10.2	6.3
Jul	16° / 2°	15	3.3	0.9	10.4	6.5
Aug	19° / 5°	17	3.3	0.4	11	7.6
Sep	21° / 8°	32	5.4	0.4	11.8	7.6
Oct	23° / 11°	65	10	0	12.7	7.2
Nov	24° / 14°	98	12.9	0	13.4	6.6
Dec	26° / 16°	129	15.4	0	13.8	6.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 18% of April, with mostly cloudy or overcast conditions the remaining 43%.

	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
Clearer (%)	54	54	54	54	54	54	55	55	56	56	57	57	58	58	58	58	59	58	58	58	58	59	59	59	58	58	58	58	58	58
Cloudier (%)	46	46	46	46	46	46	45	45	44	44	43	43	42	42	42	42	41	42	42	42	42	41	41	41	42	42	42	42	42	42

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

Chance of precipitation in April

Any precipitation

San Isidro gets around 65 mm of rain and snow over 9.7 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 32% and peaks near 40% 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
Rain chance (%)	40	39	39	39	38	38	37	36	35	34	33	32	31	30	30	29	29	28	28	28	27	27	27	27	27	27	27	28	28	28

	Rain chance (%)
1	40
2	39
3	39
4	39
5	38
6	38
7	37
8	36
9	35
10	34
11	33
12	32
13	31
14	30
15	30
16	29
17	29
18	28
19	28
20	28
21	27
22	27
23	27
24	27
25	27
26	27
27	27
28	28
29	28
30	28

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 64% 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
Dry (%)	45	46	48	49	50	51	53	55	56	58	61	62	64	65	66	67	67	69	70	70	72	72	72	73	73	73	74	74	75	76
Comfortable (%)	37	36	36	35	34	34	33	32	31	30	29	28	27	27	26	26	26	25	25	25	24	24	24	23	23	23	22	22	21	21
Humid (%)	17	16	15	14	14	13	12	11	11	10	9	9	8	7	7	6	6	5	5	5	4	4	4	4	4	4	4	4	4	3
Muggy (%)	1	1	1	2	2	2	2	2	2	2	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	45	37	17	1
2	46	36	16	1
3	48	36	15	1
4	49	35	14	2
5	50	34	14	2
6	51	34	13	2
7	53	33	12	2
8	55	32	11	2
9	56	31	11	2
10	58	30	10	2
11	61	29	9	1
12	62	28	9	1
13	64	27	8	1
14	65	27	7	1
15	66	26	7	1
16	67	26	6	1
17	67	26	6	1
18	69	25	5	1
19	70	25	5	0
20	70	25	5	0
21	72	24	4	0
22	72	24	4	0
23	72	24	4	0
24	73	23	4	0
25	73	23	4	0
26	73	23	4	0
27	74	22	4	0
28	74	22	4	0
29	75	21	4	0
30	76	21	3	0

Wind in April

Winds average 7 km/h in April.

Across April, daily wind ranges from about 6 km/h on the calmest days to 7 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
Wind speed (km/h)	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	6	6	6	6	6
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

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

Sunrise & sunset in April

DaylightNight

Daylight runs from about 11 h 42 min at the start of April to 11 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over April. Sunrise moves from 7:35 AM to 7:52 AM, and sunset from 7:20 PM to 6:49 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
Daylight (h)	11.7	11.7	11.7	11.7	11.6	11.6	11.6	11.5	11.5	11.5	11.5	11.4	11.4	11.4	11.3	11.3	11.3	11.3	11.2	11.2	11.2	11.2	11.1	11.1	11.1	11.1	11.0	11.0	11.0	11.0
Sunrise (AM)	7:35	7:36	7:36	7:37	7:37	7:38	7:38	7:39	7:40	7:40	7:41	7:41	7:42	7:42	7:43	7:44	7:44	7:45	7:45	7:46	7:46	7:47	7:48	7:48	7:49	7:49	7:50	7:51	7:51	7:52
Sunset (PM)	7:20	7:19	7:18	7:16	7:15	7:14	7:13	7:12	7:11	7:09	7:08	7:07	7:06	7:05	7:04	7:03	7:02	7:01	7:00	6:58	6:57	6:56	6:55	6:54	6:53	6:52	6:52	6:51	6:50	6:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.7	7:35	7:20
2	11.7	7:36	7:19
3	11.7	7:36	7:18
4	11.7	7:37	7:16
5	11.6	7:37	7:15
6	11.6	7:38	7:14
7	11.6	7:38	7:13
8	11.5	7:39	7:12
9	11.5	7:40	7:11
10	11.5	7:40	7:09
11	11.5	7:41	7:08
12	11.4	7:41	7:07
13	11.4	7:42	7:06
14	11.4	7:42	7:05
15	11.3	7:43	7:04
16	11.3	7:44	7:03
17	11.3	7:44	7:02
18	11.3	7:45	7:01
19	11.2	7:45	7:00
20	11.2	7:46	6:58
21	11.2	7:46	6:57
22	11.2	7:47	6:56
23	11.1	7:48	6:55
24	11.1	7:48	6:54
25	11.1	7:49	6:53
26	11.1	7:49	6:52
27	11.0	7:50	6:52
28	11.0	7:51	6:51
29	11.0	7:51	6:50
30	11.0	7:52	6:49

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.07 kWh/m².

For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 6.6 kWh/m² in December across the year — April's 4.07 kWh/m² falls in the middle.

	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
Solar energy (kWh/m²)	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.2	4.2	4.2	4.2	4.2	4.2	4.2	4.2	4.1	4.1	4.1	4.1	4.0	4.0	4.0	4.0	3.9	3.9	3.9	3.9	3.8	3.8	3.8
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.3	Bright
2	4.3	Bright
3	4.3	Bright
4	4.3	Bright
5	4.3	Bright
6	4.3	Bright
7	4.3	Bright
8	4.2	Bright
9	4.2	Bright
10	4.2	Bright
11	4.2	Bright
12	4.2	Bright
13	4.2	Bright
14	4.2	Bright
15	4.2	Bright
16	4.1	Bright
17	4.1	Bright
18	4.1	Bright
19	4.1	Bright
20	4.0	Bright
21	4.0	Bright
22	4.0	Moderate
23	4.0	Moderate
24	3.9	Moderate
25	3.9	Moderate
26	3.9	Moderate
27	3.9	Moderate
28	3.8	Moderate
29	3.8	Moderate
30	3.8	Moderate

Planning a trip in April

Hazard calendar for San Isidro

In seasonPeak

None of San Isidro's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

San Isidro's rainy season runs November–March, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is April a good time to visit San Isidro?

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

6.6

Sightseeing

4th-best month of the year

4.0

Beach & pool

8th-best month of the year

April is a reasonable time to visit San Isidro for sightseeing.

What to pack for San Isidro in April

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

In April, San Isidro sees daytime highs around 21°C and nights near 11°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in San Isidro in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Isidro peaks around January 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 4 (moderate).

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	14	12	7	5	4	4	6	8	12	13	14
Level	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate	High	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	14	Extreme
Mar	12	Extreme
Apr	7	Very high
May	5	High
Jun	4	Moderate
Jul	4	Moderate
Aug	6	High
Sep	8	Very high
Oct	12	Extreme
Nov	13	Extreme
Dec	14	Extreme

Location & terrain

Where is San Isidro?

San Isidro sits at 28.5°S, 65.7°W, 518 m above sea level, in Argentina. The nearest listed city is Catamarca, 6.0 km away.

Topography around San Isidro

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

Within 3 km, the terrain around San Isidro has only modest variations in elevation — a maximum elevation change of 134 m around an average of 522 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,541 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,232 m.

The land around San Isidro is covered by artificial surfaces (33%), trees (24%) and shrubs (21%) within 3 km, trees (40%) and shrubs (38%) within 16 km, and shrubs (44%) and trees (24%) within 80 km.

3 km

134 m

artificial surfaces 33%

16 km

1,541 m

trees 40%

80 km

4,232 m

shrubs 44%

treesshrubsgrasslandcroplandartificial surfacesbare terrain

← March San Isidro year-round climate May →Best places to visit in April

April weather nearby: Catamarca 6.0 km · Aimogasta 106 km · Aguilares 115 km · Termas de Río Hondo 137 km · Monteros 145 km · La Rioja 153 km · Belén 156 km · Famaillá 159 km

Argentina travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / I; 220 V · 50 Hz
Prices: ≈ 46% of US; price level, 2025
GDP per capita: $14,898; 2025
Happiness: 6.4 / 10; World Happiness, 2025
Homicide rate: 4.5; per 100k, 2023
Road deaths: 14.1; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: High; EF EPI 575
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 San Isidro (-28.4578°, -65.725°, elevation 518 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. 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	22	13
2	22	13
3	22	13
4	22	13
5	22	12
6	22	12
7	22	12
8	22	12
9	21	12
10	21	12
11	21	12
12	21	12
13	21	11
14	21	11
15	21	11
16	21	11
17	21	11
18	21	11
19	21	11
20	21	11
21	21	11
22	21	10
23	21	10
24	20	10
25	20	10
26	20	10
27	20	10
28	20	10
29	20	10
30	20	9

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

	Rain chance (%)
1	40
2	39
3	39
4	39
5	38
6	38
7	37
8	36
9	35
10	34
11	33
12	32
13	31
14	30
15	30
16	29
17	29
18	28
19	28
20	28
21	27
22	27
23	27
24	27
25	27
26	27
27	27
28	28
29	28
30	28

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	45	37	17	1
2	46	36	16	1
3	48	36	15	1
4	49	35	14	2
5	50	34	14	2
6	51	34	13	2
7	53	33	12	2
8	55	32	11	2
9	56	31	11	2
10	58	30	10	2
11	61	29	9	1
12	62	28	9	1
13	64	27	8	1
14	65	27	7	1
15	66	26	7	1
16	67	26	6	1
17	67	26	6	1
18	69	25	5	1
19	70	25	5	0
20	70	25	5	0
21	72	24	4	0
22	72	24	4	0
23	72	24	4	0
24	73	23	4	0
25	73	23	4	0
26	73	23	4	0
27	74	22	4	0
28	74	22	4	0
29	75	21	4	0
30	76	21	3	0

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

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

	Rain chance (%)
1	40
2	39
3	39
4	39
5	38
6	38
7	37
8	36
9	35
10	34
11	33
12	32
13	31
14	30
15	30
16	29
17	29
18	28
19	28
20	28
21	27
22	27
23	27
24	27
25	27
26	27
27	27
28	28
29	28
30	28

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	45	37	17	1
2	46	36	16	1
3	48	36	15	1
4	49	35	14	2
5	50	34	14	2
6	51	34	13	2
7	53	33	12	2
8	55	32	11	2
9	56	31	11	2
10	58	30	10	2
11	61	29	9	1
12	62	28	9	1
13	64	27	8	1
14	65	27	7	1
15	66	26	7	1
16	67	26	6	1
17	67	26	6	1
18	69	25	5	1
19	70	25	5	0
20	70	25	5	0
21	72	24	4	0
22	72	24	4	0
23	72	24	4	0
24	73	23	4	0
25	73	23	4	0
26	73	23	4	0
27	74	22	4	0
28	74	22	4	0
29	75	21	4	0
30	76	21	3	0

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

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

	Rain chance (%)
1	40
2	39
3	39
4	39
5	38
6	38
7	37
8	36
9	35
10	34
11	33
12	32
13	31
14	30
15	30
16	29
17	29
18	28
19	28
20	28
21	27
22	27
23	27
24	27
25	27
26	27
27	27
28	28
29	28
30	28

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	45	37	17	1
2	46	36	16	1
3	48	36	15	1
4	49	35	14	2
5	50	34	14	2
6	51	34	13	2
7	53	33	12	2
8	55	32	11	2
9	56	31	11	2
10	58	30	10	2
11	61	29	9	1
12	62	28	9	1
13	64	27	8	1
14	65	27	7	1
15	66	26	7	1
16	67	26	6	1
17	67	26	6	1
18	69	25	5	1
19	70	25	5	0
20	70	25	5	0
21	72	24	4	0
22	72	24	4	0
23	72	24	4	0
24	73	23	4	0
25	73	23	4	0
26	73	23	4	0
27	74	22	4	0
28	74	22	4	0
29	75	21	4	0
30	76	21	3	0