Treinta y Tres weather in September

In September, Treinta y Tres sees average daytime highs of 19°C and overnight lows near 9°C, with 99 mm of rain across 8.6 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 4th-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 29% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 18 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Treinta y Tres's 10th-clearest and 1st-windiest month. For the whole year in context, see Treinta y Tres's year-round climate.

Daytime high: 19°; 9th warmest
Overnight low: 9°; 4th coldest
Rainfall: 99 mm; 8.6 wet days
Daylight: 11 h 48 min; 7:38 AM – 7:26 PM
Cloud cover: 61%; 10th clearest
Wind: 14 km/h; 1st windiest
Solar energy: 4.15 kWh/m²
Travel score: 6.3; out of 10

Treinta y Tres is city of Treinta y Tres Department, Uruguay.

Density: 1,429/km²; people per km²
Founded: 1853

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

← August Treinta y Tres year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

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

A typical September day in Treinta y Tres reaches about 19°C in the afternoon and slips back to 9°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 24°C. Set against its neighbours, September runs about 1°C warmer than August and about 3°C cooler than October.

	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)	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	20	20	20	20	20	20	20	20	20	20
Avg low (°C)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	10	10	10	10	10	10	10	10	10

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

Treinta y Tres weather by month

How September compares with the rest of the year at a glance. September is the 9th-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	29° / 18°	83	8.5	13.9	5.8
Feb	28° / 18°	94	8.9	13.2	6.1
Mar	27° / 16°	82	8.7	12.3	6.8
Apr	23° / 14°	108	8.7	11.2	7.0
May	19° / 10°	97	7	10.3	6.6
Jun	17° / 8°	91	8.1	9.8	5.5
Jul	16° / 7°	89	8	10	5.3
Aug	18° / 8°	103	8.2	10.8	6.1
Sep	19° / 9°	99	8.6	11.8	6.3
Oct	22° / 12°	112	10	12.8	6.6
Nov	25° / 14°	92	8.1	13.7	7.2
Dec	28° / 16°	87	8.4	14.2	6.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 58%.

	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 (%)	42	43	43	43	43	43	43	43	43	43	42	42	42	42	42	42	42	43	43	44	44	44	43	43	42	42	41	40	40	40
Cloudier (%)	58	57	57	57	57	57	57	57	57	57	58	58	58	58	58	58	58	57	57	56	56	56	57	57	58	58	59	60	60	60

	Clearer (%)	Cloudier (%)
1	42	58
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	43	57
11	42	58
12	42	58
13	42	58
14	42	58
15	42	58
16	42	58
17	42	58
18	43	57
19	43	57
20	44	56
21	44	56
22	44	56
23	43	57
24	43	57
25	42	58
26	42	58
27	41	59
28	40	60
29	40	60
30	40	60

Chance of precipitation in September

Any precipitation

Treinta y Tres gets around 99 mm of rain over 8.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 31% 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
Rain chance (%)	31	31	31	31	31	31	30	30	30	29	29	28	28	27	27	27	27	27	27	27	27	27	27	27	28	28	29	29	30	30

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

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 72% 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 (%)	71	71	71	71	72	72	73	73	73	73	73	73	74	74	74	74	75	75	75	75	74	74	73	72	72	70	70	68	68	67
Comfortable (%)	20	20	20	20	20	20	19	19	19	19	19	19	18	18	18	18	17	17	17	17	18	18	19	20	20	21	21	22	22	22
Humid (%)	8	8	8	8	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	8	8	9	9	10
Muggy (%)	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	1	1	1	1	1

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	71	20	8	1
2	71	20	8	1
3	71	20	8	1
4	71	20	8	1
5	72	20	7	1
6	72	20	7	1
7	73	19	7	1
8	73	19	7	1
9	73	19	7	1
10	73	19	7	1
11	73	19	7	1
12	73	19	7	1
13	74	18	7	1
14	74	18	7	1
15	74	18	7	1
16	74	18	7	1
17	75	17	7	1
18	75	17	7	1
19	75	17	7	1
20	75	17	7	1
21	74	18	7	1
22	74	18	7	1
23	73	19	7	1
24	72	20	7	1
25	72	20	7	1
26	70	21	8	1
27	70	21	8	1
28	68	22	9	1
29	68	22	9	1
30	67	22	10	1

Wind in September

Winds average 14 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 14 km/h on the calmest days to 14 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)	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 18 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over September. Sunrise moves from 7:59 AM to 7:18 AM, and sunset from 7:16 PM to 7:36 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
Daylight (h)	11.3	11.3	11.3	11.4	11.4	11.4	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.8	11.9	11.9	11.9	12.0	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.3	12.3
Sunrise (AM)	7:59	7:58	7:56	7:55	7:53	7:52	7:51	7:49	7:48	7:46	7:45	7:44	7:42	7:41	7:39	7:38	7:37	7:35	7:34	7:32	7:31	7:29	7:28	7:27	7:25	7:24	7:22	7:21	7:20	7:18
Sunset (PM)	7:16	7:16	7:17	7:18	7:18	7:19	7:20	7:20	7:21	7:22	7:22	7:23	7:24	7:24	7:25	7:26	7:26	7:27	7:28	7:29	7:29	7:30	7:31	7:31	7:32	7:33	7:33	7:34	7:35	7:36

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	7:59	7:16
2	11.3	7:58	7:16
3	11.3	7:56	7:17
4	11.4	7:55	7:18
5	11.4	7:53	7:18
6	11.4	7:52	7:19
7	11.5	7:51	7:20
8	11.5	7:49	7:20
9	11.6	7:48	7:21
10	11.6	7:46	7:22
11	11.6	7:45	7:22
12	11.7	7:44	7:23
13	11.7	7:42	7:24
14	11.7	7:41	7:24
15	11.8	7:39	7:25
16	11.8	7:38	7:26
17	11.8	7:37	7:26
18	11.9	7:35	7:27
19	11.9	7:34	7:28
20	11.9	7:32	7:29
21	12.0	7:31	7:29
22	12.0	7:29	7:30
23	12.0	7:28	7:31
24	12.1	7:27	7:31
25	12.1	7:25	7:32
26	12.1	7:24	7:33
27	12.2	7:22	7:33
28	12.2	7:21	7:34
29	12.3	7:20	7:35
30	12.3	7:18	7:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 2.21 kWh/m² to a high of 7 kWh/m² in December across the year — September's 4.15 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)	3.5	3.6	3.6	3.6	3.7	3.7	3.8	3.8	3.9	3.9	3.9	4.0	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.3	4.4	4.4	4.5	4.5	4.5	4.5	4.6	4.6	4.6	4.6
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.5	Moderate
2	3.6	Moderate
3	3.6	Moderate
4	3.6	Moderate
5	3.7	Moderate
6	3.7	Moderate
7	3.8	Moderate
8	3.8	Moderate
9	3.9	Moderate
10	3.9	Moderate
11	3.9	Moderate
12	4.0	Moderate
13	4.0	Bright
14	4.1	Bright
15	4.1	Bright
16	4.2	Bright
17	4.2	Bright
18	4.3	Bright
19	4.3	Bright
20	4.3	Bright
21	4.4	Bright
22	4.4	Bright
23	4.5	Bright
24	4.5	Bright
25	4.5	Bright
26	4.5	Bright
27	4.6	Bright
28	4.6	Bright
29	4.6	Bright
30	4.6	Bright

Planning a trip in September

Is September a good time to visit Treinta y Tres?

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

6.3

Sightseeing

7th-best month of the year

2.9

Beach & pool

9th-best month of the year

September is a reasonable time to visit Treinta y Tres for sightseeing.

What to pack for Treinta y Tres in September

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

In September, Treinta y Tres sees daytime highs around 19°C and nights near 9°C. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Treinta y Tres in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Treinta y Tres peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	12	10	6	4	3	3	4	6	8	11	12
Level	Extreme	Extreme	Very high	High	Moderate	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	12	Extreme
Mar	10	Very high
Apr	6	High
May	4	Moderate
Jun	3	Moderate
Jul	3	Moderate
Aug	4	Moderate
Sep	6	High
Oct	8	Very high
Nov	11	Extreme
Dec	12	Extreme

Location & terrain

Where is Treinta y Tres?

Treinta y Tres sits at 33.2°S, 54.4°W, 55 m above sea level, in Uruguay. The nearest listed city is Melo, 98 km away.

Topography around Treinta y Tres

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

Within 3 km, the terrain around Treinta y Tres has only modest variations in elevation — a maximum elevation change of 44 m around an average of 40 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 144 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.

The land around Treinta y Tres is covered by grassland (38%), trees (35%) and artificial surfaces (24%) within 3 km, grassland (72%) within 16 km, and grassland (69%) within 80 km.

3 km

44 m

grassland 38%

16 km

144 m

grassland 72%

80 km

375 m

grassland 69%

treesgrasslandcroplandartificial surfaceswaterwetland

← August Treinta y Tres year-round climate October →Best places to visit in September

September weather nearby: Melo 98 km · Santa Vitória do Palmar 100 km · Jaguarão 120 km · Rocha 139 km · Minas 150 km · La Paloma 161 km · Arroio Grande 164 km · San Carlos 180 km

Uruguay travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / F / I / L; 230 V · 50 Hz
Prices: ≈ 66% of US; price level, 2025
GDP per capita: $25,216; 2025
Happiness: 6.6 / 10; World Happiness, 2025
Homicide rate: 11.2; per 100k, 2023
Road deaths: 14.8; per 100k/yr, 2019
Income group: High; World Bank
English: Moderate; EF EPI 542
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 Treinta y Tres (-33.231°, -54.3858°, elevation 55 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	19	9
2	19	9
3	19	9
4	19	9
5	19	9
6	19	9
7	19	9
8	19	9
9	19	9
10	19	9
11	19	9
12	19	9
13	19	9
14	19	9
15	19	9
16	19	9
17	19	9
18	19	9
19	19	9
20	19	9
21	20	9
22	20	10
23	20	10
24	20	10
25	20	10
26	20	10
27	20	10
28	20	10
29	20	10
30	20	10

	Clearer (%)	Cloudier (%)
1	42	58
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	43	57
11	42	58
12	42	58
13	42	58
14	42	58
15	42	58
16	42	58
17	42	58
18	43	57
19	43	57
20	44	56
21	44	56
22	44	56
23	43	57
24	43	57
25	42	58
26	42	58
27	41	59
28	40	60
29	40	60
30	40	60

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

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	71	20	8	1
2	71	20	8	1
3	71	20	8	1
4	71	20	8	1
5	72	20	7	1
6	72	20	7	1
7	73	19	7	1
8	73	19	7	1
9	73	19	7	1
10	73	19	7	1
11	73	19	7	1
12	73	19	7	1
13	74	18	7	1
14	74	18	7	1
15	74	18	7	1
16	74	18	7	1
17	75	17	7	1
18	75	17	7	1
19	75	17	7	1
20	75	17	7	1
21	74	18	7	1
22	74	18	7	1
23	73	19	7	1
24	72	20	7	1
25	72	20	7	1
26	70	21	8	1
27	70	21	8	1
28	68	22	9	1
29	68	22	9	1
30	67	22	10	1

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

	Clearer (%)	Cloudier (%)
1	42	58
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	43	57
11	42	58
12	42	58
13	42	58
14	42	58
15	42	58
16	42	58
17	42	58
18	43	57
19	43	57
20	44	56
21	44	56
22	44	56
23	43	57
24	43	57
25	42	58
26	42	58
27	41	59
28	40	60
29	40	60
30	40	60

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

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	71	20	8	1
2	71	20	8	1
3	71	20	8	1
4	71	20	8	1
5	72	20	7	1
6	72	20	7	1
7	73	19	7	1
8	73	19	7	1
9	73	19	7	1
10	73	19	7	1
11	73	19	7	1
12	73	19	7	1
13	74	18	7	1
14	74	18	7	1
15	74	18	7	1
16	74	18	7	1
17	75	17	7	1
18	75	17	7	1
19	75	17	7	1
20	75	17	7	1
21	74	18	7	1
22	74	18	7	1
23	73	19	7	1
24	72	20	7	1
25	72	20	7	1
26	70	21	8	1
27	70	21	8	1
28	68	22	9	1
29	68	22	9	1
30	67	22	10	1

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

	Clearer (%)	Cloudier (%)
1	42	58
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	43	57
11	42	58
12	42	58
13	42	58
14	42	58
15	42	58
16	42	58
17	42	58
18	43	57
19	43	57
20	44	56
21	44	56
22	44	56
23	43	57
24	43	57
25	42	58
26	42	58
27	41	59
28	40	60
29	40	60
30	40	60

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

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	71	20	8	1
2	71	20	8	1
3	71	20	8	1
4	71	20	8	1
5	72	20	7	1
6	72	20	7	1
7	73	19	7	1
8	73	19	7	1
9	73	19	7	1
10	73	19	7	1
11	73	19	7	1
12	73	19	7	1
13	74	18	7	1
14	74	18	7	1
15	74	18	7	1
16	74	18	7	1
17	75	17	7	1
18	75	17	7	1
19	75	17	7	1
20	75	17	7	1
21	74	18	7	1
22	74	18	7	1
23	73	19	7	1
24	72	20	7	1
25	72	20	7	1
26	70	21	8	1
27	70	21	8	1
28	68	22	9	1
29	68	22	9	1
30	67	22	10	1