Rengo weather in September

In September, Rengo sees average daytime highs of 14°C and overnight lows near 3°C, with 84 mm of precipitation across 8.9 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 13°C in the first days to 15°C by the end. The sky is clear or mostly clear about 42% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 12 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Rengo's 8th-clearest and 11th-windiest month. For the whole year in context, see Rengo's year-round climate.

Daytime high: 14°; 9th warmest
Overnight low: 3°; 4th coldest
Precipitation: 84 mm; 8.9 wet days
Daylight: 11 h 48 min; 7:44 AM – 7:31 PM
Cloud cover: 50%; 8th clearest
Wind: 4 km/h; 11th windiest
Solar energy: 4.85 kWh/m²
Travel score: 4.3; out of 10

Rengo is municipality in Chile.

Air quality: Elevated; PM2.5 23.8 µg/m³ · 2019

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

← August Rengo 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

Highs climb over the month, from about 13°C in the first days to 15°C by the end.

A typical September day in Rengo reaches about 14°C in the afternoon and slips back to 3°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 19°C. Set against its neighbours, September runs about 2°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)	13	13	13	13	13	13	13	13	14	14	14	14	14	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15
Avg low (°C)	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	3	3	3	3	3	3	3	3	3	3	3	3	3

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

How September really feels in Rengo

Once humidity and wind are folded in, September 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Rengo weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	24° / 11°	10	2.2	0	14	9.2
Feb	24° / 11°	11	2.3	0	13.3	9.1
Mar	22° / 9°	14	2.4	0	12.3	8.7
Apr	18° / 6°	57	4.7	0.4	11.2	7.0
May	15° / 3°	127	8	2.1	10.2	4.7
Jun	11° / 1°	209	10.6	5.6	9.7	2.6
Jul	10° / -0°	147	9.7	6	9.9	2.5
Aug	12° / 1°	123	8.7	5.2	10.7	3.3
Sep	14° / 3°	84	8.9	2.9	11.8	4.3
Oct	17° / 4°	59	8.7	1.7	12.9	5.8
Nov	20° / 6°	35	6.9	0.3	13.8	7.2
Dec	23° / 9°	19	3.8	0.1	14.3	8.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% 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 45%.

	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 (%)	49	49	49	51	51	52	53	54	54	55	55	56	57	57	57	58	58	57	57	57	57	57	57	57	56	56	56	56	57	57
Cloudier (%)	51	51	51	49	49	48	47	46	46	45	45	44	43	43	43	42	42	43	43	43	43	43	43	43	44	44	44	44	43	43

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	49	51
4	51	49
5	51	49
6	52	48
7	53	47
8	54	46
9	54	46
10	55	45
11	55	45
12	56	44
13	57	43
14	57	43
15	57	43
16	58	42
17	58	42
18	57	43
19	57	43
20	57	43
21	57	43
22	57	43
23	57	43
24	57	43
25	56	44
26	56	44
27	56	44
28	56	44
29	57	43
30	57	43

Chance of precipitation in September

Any precipitationSnow

Rengo gets around 84 mm of rain and snow over 8.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 30% and peaks near 32% on the wettest days, and about 3 days bring snow.

	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 (%)	32	32	32	32	32	32	31	31	31	31	30	30	30	29	29	29	28	28	28	28	28	28	28	29	29	29	29	29	30	30
Snow chance (%)	15	15	14	14	14	13	13	12	12	12	12	11	11	11	10	10	9	9	8	8	8	8	8	8	8	8	8	8	8	8

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

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 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
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

	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

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 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)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
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	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 12 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 66 minutes over September. Sunrise moves from 8:06 AM to 7:24 AM, and sunset from 7:20 PM to 7:42 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)	11.2	11.3	11.3	11.4	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	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	12.2	12.2	12.2	12.3	12.3
Sunrise (AM)	8:06	8:04	8:03	8:02	8:00	7:59	7:57	7:56	7:54	7:53	7:51	7:50	7:49	7:47	7:46	7:44	7:43	7:41	7:40	7:38	7:37	7:35	7:34	7:32	7:31	7:29	7:28	7:27	7:25	7:24
Sunset (PM)	7:20	7:21	7:22	7:23	7:23	7:24	7:25	7:26	7:26	7:27	7:28	7:28	7:29	7:30	7:31	7:31	7:32	7:33	7:34	7:34	7:35	7:36	7:37	7:37	7:38	7:39	7:40	7:40	7:41	7:42

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.2	8:06	7:20
2	11.3	8:04	7:21
3	11.3	8:03	7:22
4	11.4	8:02	7:23
5	11.4	8:00	7:23
6	11.4	7:59	7:24
7	11.5	7:57	7:25
8	11.5	7:56	7:26
9	11.5	7:54	7:26
10	11.6	7:53	7:27
11	11.6	7:51	7:28
12	11.6	7:50	7:28
13	11.7	7:49	7:29
14	11.7	7:47	7:30
15	11.8	7:46	7:31
16	11.8	7:44	7:31
17	11.8	7:43	7:32
18	11.9	7:41	7:33
19	11.9	7:40	7:34
20	11.9	7:38	7:34
21	12.0	7:37	7:35
22	12.0	7:35	7:36
23	12.0	7:34	7:37
24	12.1	7:32	7:37
25	12.1	7:31	7:38
26	12.2	7:29	7:39
27	12.2	7:28	7:40
28	12.2	7:27	7:40
29	12.3	7:25	7:41
30	12.3	7:24	7:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.85 kWh/m².

For context, solar energy here swings from a low near 2.19 kWh/m² to a high of 8.84 kWh/m² in January across the year — September's 4.85 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)	4.0	4.1	4.1	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.6	4.7	4.7	4.8	4.9	4.9	5.0	5.0	5.1	5.1	5.2	5.2	5.3	5.3	5.4	5.4	5.4	5.5	5.5	5.6
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

	Solar energy (kWh/m²)	Level
1	4.0	Bright
2	4.1	Bright
3	4.1	Bright
4	4.2	Bright
5	4.3	Bright
6	4.3	Bright
7	4.4	Bright
8	4.4	Bright
9	4.5	Bright
10	4.5	Bright
11	4.6	Bright
12	4.7	Bright
13	4.7	Bright
14	4.8	Bright
15	4.9	Bright
16	4.9	Bright
17	5.0	Bright
18	5.0	Bright
19	5.1	Bright
20	5.1	Bright
21	5.2	Bright
22	5.2	Bright
23	5.3	Bright
24	5.3	Bright
25	5.4	Bright
26	5.4	Bright
27	5.4	Bright
28	5.5	Bright
29	5.5	Bright
30	5.6	Bright

Planning a trip in September

Hazard calendar for Rengo

In seasonPeak

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

Rengo's rainy season runs May–August, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Rengo?

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

4.3

Sightseeing

9th-best month of the year

0.0

Beach & pool

9th-best month of the year

September is a reasonable time to visit Rengo for sightseeing.

What to pack for Rengo in September

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

In September, Rengo sees daytime highs around 14°C and nights near 3°C. Worth packing: a warm layer, rain gear and sun protection. About 9 days see rain.

a warm layerrain gearsun protection

UV index in Rengo 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 Rengo peaks around January 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near May 24 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	13	10	5	3	3	3	3	6	9	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	13	Extreme
Mar	10	Very high
Apr	5	High
May	3	Moderate
Jun	3	Moderate
Jul	3	Moderate
Aug	3	Moderate
Sep	6	High
Oct	9	Very high
Nov	11	Extreme
Dec	12	Extreme

Air quality in Rengo in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Rengo is worst in July — around 32 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 16 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Rengo's WHO annual average of 23.8 µg/m³.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	20	17	17	23	31	31	32	31	29	22	17	16
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	20	Moderate
Feb	17	Moderate
Mar	17	Moderate
Apr	23	Moderate
May	31	Moderate
Jun	31	Moderate
Jul	32	Moderate
Aug	31	Moderate
Sep	29	Moderate
Oct	22	Moderate
Nov	17	Moderate
Dec	16	Moderate

Location & terrain

Where is Rengo?

Rengo sits at 34.4°S, 70.9°W, 326 m above sea level, in Chile. The nearest listed city is San Vicente de Tagua Tagua, 20 km away.

Topography around Rengo

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

Within 3 km, the terrain around Rengo has only modest variations in elevation — a maximum elevation change of 96 m around an average of 320 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,632 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,128 m.

The land around Rengo is covered by cropland (41%), trees (24%) and artificial surfaces (22%) within 3 km, cropland (34%), trees (28%) and shrubs (23%) within 16 km, and trees (23%), bare terrain (22%) and grassland (20%) within 80 km.

3 km

96 m

cropland 41%

16 km

1,632 m

cropland 34%

80 km

5,128 m

trees 23%

treesshrubsgrasslandcroplandartificial surfacesbare terrainsnow and icewater

← August Rengo year-round climate October →Best places to visit in September

September weather nearby: San Vicente de Tagua Tagua 20 km · San Vicente 21 km · Rancagua 29 km · Machalí 32 km · Chimbarongo 38 km · Graneros 39 km · Santa Cruz 53 km · Paine 67 km

Chile travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / F / L; 220 V · 50 Hz
Prices: ≈ 48% of US; price level, 2025
GDP per capita: $17,995; 2025
Happiness: 6.3 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 6.3; per 100k, 2023
Road deaths: 14.9; per 100k/yr, 2019
Income group: High; World Bank
English: Moderate; EF EPI 517
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 Rengo (-34.4064°, -70.8583°, elevation 326 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	13	2
2	13	2
3	13	2
4	13	2
5	13	2
6	13	2
7	13	2
8	13	2
9	14	2
10	14	2
11	14	2
12	14	2
13	14	2
14	14	2
15	14	2
16	14	2
17	14	2
18	14	3
19	14	3
20	15	3
21	15	3
22	15	3
23	15	3
24	15	3
25	15	3
26	15	3
27	15	3
28	15	3
29	15	3
30	15	3

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	49	51
4	51	49
5	51	49
6	52	48
7	53	47
8	54	46
9	54	46
10	55	45
11	55	45
12	56	44
13	57	43
14	57	43
15	57	43
16	58	42
17	58	42
18	57	43
19	57	43
20	57	43
21	57	43
22	57	43
23	57	43
24	57	43
25	56	44
26	56	44
27	56	44
28	56	44
29	57	43
30	57	43

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

	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

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

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	49	51
4	51	49
5	51	49
6	52	48
7	53	47
8	54	46
9	54	46
10	55	45
11	55	45
12	56	44
13	57	43
14	57	43
15	57	43
16	58	42
17	58	42
18	57	43
19	57	43
20	57	43
21	57	43
22	57	43
23	57	43
24	57	43
25	56	44
26	56	44
27	56	44
28	56	44
29	57	43
30	57	43

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

	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

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

	Clearer (%)	Cloudier (%)
1	49	51
2	49	51
3	49	51
4	51	49
5	51	49
6	52	48
7	53	47
8	54	46
9	54	46
10	55	45
11	55	45
12	56	44
13	57	43
14	57	43
15	57	43
16	58	42
17	58	42
18	57	43
19	57	43
20	57	43
21	57	43
22	57	43
23	57	43
24	57	43
25	56	44
26	56	44
27	56	44
28	56	44
29	57	43
30	57	43

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

	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