Juanjuí weather in September

In September, Juanjuí sees average daytime highs of 31°C and overnight lows near 21°C, with 88 mm of rain across 13.3 wet days and about 12 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Juanjuí's 4th-clearest and 1st-windiest month. For the whole year in context, see Juanjuí's year-round climate.

Daytime high: 31°; 1st warmest
Overnight low: 21°; 6th coldest
Rainfall: 88 mm; 13.3 wet days
Daylight: 12 hours; 6:02 AM – 6:00 PM
Cloud cover: 59%; 4th clearest
Wind: 3 km/h; 1st windiest
Solar energy: 5.79 kWh/m²
Travel score: 4.1; out of 10

Juanjuí is town in San Martín, Peru.

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

← August Juanjuí 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 31°C through the month.

A typical September day in Juanjuí reaches about 31°C in the afternoon and slips back to 21°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 34°C. Set against its neighbours, September runs about 1°C warmer than August and on par with 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)	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31
Avg low (°C)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21

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

How September really feels in Juanjuí

Once humidity and wind are folded in, September averages 30 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

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Juanjuí weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 21°	221	25	12.4	3.3
Feb	29° / 21°	214	23	12.2	3.2
Mar	29° / 21°	227	25.5	12	3.3
Apr	29° / 21°	167	21.6	11.8	3.7
May	29° / 21°	117	17.6	11.7	4.4
Jun	29° / 20°	73	12.4	11.6	5.3
Jul	29° / 20°	60	10.4	11.6	5.6
Aug	30° / 20°	61	9.3	11.8	5.1
Sep	31° / 21°	88	13.3	12	4.1
Oct	31° / 21°	169	20.8	12.2	3.4
Nov	30° / 21°	233	24.4	12.3	3.1
Dec	30° / 21°	237	25.9	12.4	3.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 47%. 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
Clearer (%)	69	67	66	65	64	63	62	61	60	59	58	57	56	55	53	52	50	49	47	47	45	44	44	42	42	42	41	41	40	40
Cloudier (%)	31	33	34	35	36	37	38	39	40	41	42	43	44	45	47	48	50	51	53	53	55	56	56	58	58	58	59	59	60	60

	Clearer (%)	Cloudier (%)
1	69	31
2	67	33
3	66	34
4	65	35
5	64	36
6	63	37
7	62	38
8	61	39
9	60	40
10	59	41
11	58	42
12	57	43
13	56	44
14	55	45
15	53	47
16	52	48
17	50	50
18	49	51
19	47	53
20	47	53
21	45	55
22	44	56
23	44	56
24	42	58
25	42	58
26	42	58
27	41	59
28	41	59
29	40	60
30	40	60

Chance of precipitation in September

Any precipitation

Juanjuí gets around 88 mm of rain over 13.3 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 45% and peaks near 54% on the wettest days. The odds climb 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 (%)	38	39	39	39	39	40	40	40	41	41	42	42	43	43	44	44	45	45	46	47	47	48	49	49	50	51	52	53	53	54

	Rain chance (%)
1	38
2	39
3	39
4	39
5	39
6	40
7	40
8	40
9	41
10	41
11	42
12	42
13	43
14	43
15	44
16	44
17	45
18	45
19	46
20	47
21	47
22	48
23	49
24	49
25	50
26	51
27	52
28	53
29	53
30	54

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 67% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

	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
Humid (%)	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Muggy (%)	75	75	75	75	74	75	75	74	74	73	72	71	70	69	68	67	67	66	66	65	64	63	62	61	60	59	58	56	55	54
Oppressive (%)	23	23	23	23	24	24	24	25	25	26	27	28	29	30	31	32	33	34	34	35	36	37	38	39	40	41	42	44	45	46

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	75	23
2	2	75	23
3	2	75	23
4	2	75	23
5	2	74	24
6	1	75	24
7	1	75	24
8	1	74	25
9	1	74	25
10	1	73	26
11	1	72	27
12	1	71	28
13	1	70	29
14	1	69	30
15	1	68	31
16	1	67	32
17	0	67	33
18	0	66	34
19	0	66	34
20	0	65	35
21	0	64	36
22	0	63	37
23	0	62	38
24	0	61	39
25	0	60	40
26	0	59	41
27	0	58	42
28	0	56	44
29	0	55	45
30	0	54	46

Wind in September

Winds average 3 km/h in September, the windiest month of the year.

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over September. Sunrise moves from 6:11 AM to 5:55 AM, and sunset from 6:02 PM to 5:58 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)	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.1
Sunrise (AM)	6:11	6:10	6:10	6:09	6:09	6:08	6:08	6:07	6:06	6:06	6:05	6:05	6:04	6:04	6:03	6:02	6:02	6:01	6:01	6:00	6:00	5:59	5:58	5:58	5:57	5:57	5:56	5:56	5:55	5:55
Sunset (PM)	6:02	6:02	6:02	6:02	6:02	6:02	6:02	6:01	6:01	6:01	6:01	6:01	6:01	6:00	6:00	6:00	6:00	6:00	6:00	5:59	5:59	5:59	5:59	5:59	5:59	5:58	5:58	5:58	5:58	5:58

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.9	6:11	6:02
2	11.9	6:10	6:02
3	11.9	6:10	6:02
4	11.9	6:09	6:02
5	11.9	6:09	6:02
6	11.9	6:08	6:02
7	11.9	6:08	6:02
8	11.9	6:07	6:01
9	11.9	6:06	6:01
10	11.9	6:06	6:01
11	11.9	6:05	6:01
12	11.9	6:05	6:01
13	11.9	6:04	6:01
14	11.9	6:04	6:00
15	12.0	6:03	6:00
16	12.0	6:02	6:00
17	12.0	6:02	6:00
18	12.0	6:01	6:00
19	12.0	6:01	6:00
20	12.0	6:00	5:59
21	12.0	6:00	5:59
22	12.0	5:59	5:59
23	12.0	5:58	5:59
24	12.0	5:58	5:59
25	12.0	5:57	5:59
26	12.0	5:57	5:58
27	12.0	5:56	5:58
28	12.0	5:56	5:58
29	12.0	5:55	5:58
30	12.1	5:55	5:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.79 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.58 kWh/m² to a high of 5.79 kWh/m² in September across the year — September's 5.79 kWh/m² sits near the top of that range.

	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)	5.7	5.7	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8
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	5.7	Bright
2	5.7	Bright
3	5.8	Bright
4	5.8	Bright
5	5.8	Bright
6	5.8	Bright
7	5.8	Bright
8	5.8	Bright
9	5.8	Bright
10	5.8	Bright
11	5.8	Bright
12	5.8	Bright
13	5.8	Bright
14	5.8	Bright
15	5.8	Bright
16	5.8	Bright
17	5.8	Bright
18	5.8	Bright
19	5.8	Bright
20	5.8	Bright
21	5.8	Bright
22	5.8	Bright
23	5.8	Bright
24	5.8	Bright
25	5.8	Bright
26	5.8	Bright
27	5.8	Bright
28	5.8	Bright
29	5.8	Bright
30	5.8	Bright

Planning a trip in September

Is September a good time to visit Juanjuí?

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

4.1

Sightseeing

5th-best month of the year

6.1

Beach & pool

4th-best month of the year

September is a reasonable time to visit Juanjuí for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Juanjuí in September

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

In September, Juanjuí sees daytime highs around 31°C and nights near 21°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Juanjuí in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Juanjuí peaks around February 13 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 10 (extreme).

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)	16	16	15	12	12	10	10	11	10	13	13	13
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

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

Air quality in Juanjuí 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 Juanjuí is worst in August — around 63 µg/m³ PM2.5 (unhealthy), about 5.9× the cleanest month (May, 11 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	23	20	16	13	11	11	16	63	50	17	13	15
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Moderate	Unhealthy	Poor	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	23	Moderate
Feb	20	Moderate
Mar	16	Moderate
Apr	13	Moderate
May	11	Good
Jun	11	Good
Jul	16	Moderate
Aug	63	Unhealthy
Sep	50	Poor
Oct	17	Moderate
Nov	13	Moderate
Dec	15	Moderate

Location & terrain

Where is Juanjuí?

Juanjuí sits at 7.2°S, 76.7°W, 278 m above sea level, in Peru. The nearest listed city is Bellavista, 20 km away.

Topography around Juanjuí

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

Within 3 km, the terrain around Juanjuí has only modest variations in elevation — a maximum elevation change of 210 m around an average of 299 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 897 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,562 m.

The land around Juanjuí is covered by trees (56%) within 3 km, trees (82%) within 16 km, and trees (93%) within 80 km.

3 km

210 m

trees 56%

16 km

897 m

trees 82%

80 km

3,562 m

trees 93%

treesgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Bellavista 20 km · La Banda 87 km · Tocache 115 km · Moyobamba 130 km · Rioja 134 km · Uchiza 146 km · Yurimaguas 157 km · Huamachuco 163 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 Juanjuí (-7.177°, -76.7277°, elevation 278 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	31	21
2	31	21
3	31	21
4	31	21
5	31	21
6	31	21
7	31	21
8	31	21
9	31	21
10	31	21
11	31	21
12	31	21
13	31	21
14	31	21
15	31	21
16	31	21
17	31	21
18	31	21
19	31	21
20	31	21
21	31	21
22	31	21
23	31	21
24	31	21
25	31	21
26	31	21
27	31	21
28	31	21
29	31	21
30	31	21

	Clearer (%)	Cloudier (%)
1	69	31
2	67	33
3	66	34
4	65	35
5	64	36
6	63	37
7	62	38
8	61	39
9	60	40
10	59	41
11	58	42
12	57	43
13	56	44
14	55	45
15	53	47
16	52	48
17	50	50
18	49	51
19	47	53
20	47	53
21	45	55
22	44	56
23	44	56
24	42	58
25	42	58
26	42	58
27	41	59
28	41	59
29	40	60
30	40	60

	Rain chance (%)
1	38
2	39
3	39
4	39
5	39
6	40
7	40
8	40
9	41
10	41
11	42
12	42
13	43
14	43
15	44
16	44
17	45
18	45
19	46
20	47
21	47
22	48
23	49
24	49
25	50
26	51
27	52
28	53
29	53
30	54

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	75	23
2	2	75	23
3	2	75	23
4	2	75	23
5	2	74	24
6	1	75	24
7	1	75	24
8	1	74	25
9	1	74	25
10	1	73	26
11	1	72	27
12	1	71	28
13	1	70	29
14	1	69	30
15	1	68	31
16	1	67	32
17	0	67	33
18	0	66	34
19	0	66	34
20	0	65	35
21	0	64	36
22	0	63	37
23	0	62	38
24	0	61	39
25	0	60	40
26	0	59	41
27	0	58	42
28	0	56	44
29	0	55	45
30	0	54	46

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

	Clearer (%)	Cloudier (%)
1	69	31
2	67	33
3	66	34
4	65	35
5	64	36
6	63	37
7	62	38
8	61	39
9	60	40
10	59	41
11	58	42
12	57	43
13	56	44
14	55	45
15	53	47
16	52	48
17	50	50
18	49	51
19	47	53
20	47	53
21	45	55
22	44	56
23	44	56
24	42	58
25	42	58
26	42	58
27	41	59
28	41	59
29	40	60
30	40	60

	Rain chance (%)
1	38
2	39
3	39
4	39
5	39
6	40
7	40
8	40
9	41
10	41
11	42
12	42
13	43
14	43
15	44
16	44
17	45
18	45
19	46
20	47
21	47
22	48
23	49
24	49
25	50
26	51
27	52
28	53
29	53
30	54

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	75	23
2	2	75	23
3	2	75	23
4	2	75	23
5	2	74	24
6	1	75	24
7	1	75	24
8	1	74	25
9	1	74	25
10	1	73	26
11	1	72	27
12	1	71	28
13	1	70	29
14	1	69	30
15	1	68	31
16	1	67	32
17	0	67	33
18	0	66	34
19	0	66	34
20	0	65	35
21	0	64	36
22	0	63	37
23	0	62	38
24	0	61	39
25	0	60	40
26	0	59	41
27	0	58	42
28	0	56	44
29	0	55	45
30	0	54	46

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

	Clearer (%)	Cloudier (%)
1	69	31
2	67	33
3	66	34
4	65	35
5	64	36
6	63	37
7	62	38
8	61	39
9	60	40
10	59	41
11	58	42
12	57	43
13	56	44
14	55	45
15	53	47
16	52	48
17	50	50
18	49	51
19	47	53
20	47	53
21	45	55
22	44	56
23	44	56
24	42	58
25	42	58
26	42	58
27	41	59
28	41	59
29	40	60
30	40	60

	Rain chance (%)
1	38
2	39
3	39
4	39
5	39
6	40
7	40
8	40
9	41
10	41
11	42
12	42
13	43
14	43
15	44
16	44
17	45
18	45
19	46
20	47
21	47
22	48
23	49
24	49
25	50
26	51
27	52
28	53
29	53
30	54

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	75	23
2	2	75	23
3	2	75	23
4	2	75	23
5	2	74	24
6	1	75	24
7	1	75	24
8	1	74	25
9	1	74	25
10	1	73	26
11	1	72	27
12	1	71	28
13	1	70	29
14	1	69	30
15	1	68	31
16	1	67	32
17	0	67	33
18	0	66	34
19	0	66	34
20	0	65	35
21	0	64	36
22	0	63	37
23	0	62	38
24	0	61	39
25	0	60	40
26	0	59	41
27	0	58	42
28	0	56	44
29	0	55	45
30	0	54	46