Borba weather in September

In September, Borba sees average daytime highs of 32°C and overnight lows near 24°C, with 131 mm of rain across 19.4 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 32°C through the month. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels miserable.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Borba's 4th-clearest and 5th-windiest month. For the whole year in context, see Borba's year-round climate.

Daytime high: 32°; 1st warmest
Overnight low: 24°; 11th coldest
Rainfall: 131 mm; 19.4 wet days
Daylight: 12 hours; 5:53 AM – 5:52 PM
Cloud cover: 66%; 4th clearest
Wind: 5 km/h; 5th windiest
Solar energy: 5.3 kWh/m²
Travel score: 2.9; out of 10

← August Borba 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 32°C through the month.

A typical September day in Borba reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, September runs on par with 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)	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	33	33	33	33	33	33	33	33	33	33	33	33	33	33
Avg low (°C)	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24

	Avg high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

How September really feels in Borba

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

30 feel dangerously hot (≥ 39°C)

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.

Borba 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° / 23°	305	28.6	12.2	2.7
Feb	30° / 24°	286	26.3	12.1	2.6
Mar	30° / 24°	345	29	12	2.6
Apr	30° / 24°	315	28.6	11.9	2.6
May	30° / 23°	239	27.8	11.8	2.8
Jun	31° / 23°	117	20.4	11.8	3.4
Jul	31° / 23°	81	16.1	11.8	3.8
Aug	32° / 24°	88	16.1	11.9	3.4
Sep	32° / 24°	131	19.4	12	2.9
Oct	32° / 24°	148	21.3	12.1	2.7
Nov	32° / 24°	183	23.5	12.2	2.6
Dec	31° / 24°	263	27.7	12.2	2.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 60%.

	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	48	46	46	44	44	44	43	42	42	42	42	41	40	40	40	39	39	39	37	36	36	36	36	36	36	35	35	35	35
Cloudier (%)	51	52	54	54	56	56	56	57	58	58	58	58	59	60	60	60	61	61	61	63	64	64	64	64	64	64	65	65	65	65

	Clearer (%)	Cloudier (%)
1	49	51
2	48	52
3	46	54
4	46	54
5	44	56
6	44	56
7	44	56
8	43	57
9	42	58
10	42	58
11	42	58
12	42	58
13	41	59
14	40	60
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	37	63
21	36	64
22	36	64
23	36	64
24	36	64
25	36	64
26	36	64
27	35	65
28	35	65
29	35	65
30	35	65

Chance of precipitation in September

Any precipitation

Borba gets around 131 mm of rain over 19.4 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 64% and peaks near 65% 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 (%)	62	62	63	63	63	64	64	64	64	64	65	65	65	64	64	64	64	64	65	65	65	65	65	65	65	64	64	64	64	64

	Rain chance (%)
1	62
2	62
3	63
4	63
5	63
6	64
7	64
8	64
9	64
10	64
11	65
12	65
13	65
14	64
15	64
16	64
17	64
18	64
19	65
20	65
21	65
22	65
23	65
24	65
25	65
26	64
27	64
28	64
29	64
30	64

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 64% of days. Sticky, muggy-or-worse air turns up on roughly 100% 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
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
Oppressive (%)	37	37	37	37	37	37	37	37	37	37	37	36	36	35	35	35	34	34	33	33	33	33	33	33	33	34	34	35	36	36
Miserable (%)	62	62	62	62	62	62	62	62	62	62	62	63	63	64	64	64	65	65	66	66	66	66	66	66	66	65	65	64	63	63

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	37	62
2	1	37	62
3	1	37	62
4	1	37	62
5	1	37	62
6	1	37	62
7	1	37	62
8	1	37	62
9	1	37	62
10	1	37	62
11	1	37	62
12	1	36	63
13	1	36	63
14	1	35	64
15	1	35	64
16	1	35	64
17	1	34	65
18	1	34	65
19	1	33	66
20	1	33	66
21	1	33	66
22	1	33	66
23	1	33	66
24	1	33	66
25	1	33	66
26	1	34	65
27	1	34	65
28	1	35	64
29	1	36	63
30	1	36	63

Wind in September

Winds average 5 km/h in September.

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

Sunrise & sunset in September

DaylightNight

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

Days grow by about 6 minutes over September. Sunrise moves from 6:01 AM to 5:47 AM, and sunset from 5:56 PM to 5:49 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)	11.9	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	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	6:01	6:00	6:00	5:59	5:59	5:58	5:58	5:57	5:57	5:56	5:56	5:55	5:55	5:54	5:54	5:53	5:53	5:52	5:52	5:51	5:51	5:50	5:50	5:49	5:49	5:49	5:48	5:48	5:47	5:47
Sunset (PM)	5:56	5:55	5:55	5:55	5:55	5:54	5:54	5:54	5:54	5:53	5:53	5:53	5:53	5:52	5:52	5:52	5:52	5:51	5:51	5:51	5:51	5:50	5:50	5:50	5:50	5:50	5:49	5:49	5:49	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.9	6:01	5:56
2	11.9	6:00	5:55
3	11.9	6:00	5:55
4	11.9	5:59	5:55
5	11.9	5:59	5:55
6	11.9	5:58	5:54
7	11.9	5:58	5:54
8	11.9	5:57	5:54
9	11.9	5:57	5:54
10	12.0	5:56	5:53
11	12.0	5:56	5:53
12	12.0	5:55	5:53
13	12.0	5:55	5:53
14	12.0	5:54	5:52
15	12.0	5:54	5:52
16	12.0	5:53	5:52
17	12.0	5:53	5:52
18	12.0	5:52	5:51
19	12.0	5:52	5:51
20	12.0	5:51	5:51
21	12.0	5:51	5:51
22	12.0	5:50	5:50
23	12.0	5:50	5:50
24	12.0	5:49	5:50
25	12.0	5:49	5:50
26	12.0	5:49	5:50
27	12.0	5:48	5:49
28	12.0	5:48	5:49
29	12.0	5:47	5:49
30	12.0	5:47	5:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.3 kWh/m².

For context, solar energy here swings from a low near 3.95 kWh/m² to a high of 5.42 kWh/m² in October across the year — September's 5.3 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)	5.2	5.2	5.2	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4
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	5.2	Bright
2	5.2	Bright
3	5.2	Bright
4	5.2	Bright
5	5.2	Bright
6	5.2	Bright
7	5.3	Bright
8	5.3	Bright
9	5.3	Bright
10	5.3	Bright
11	5.3	Bright
12	5.3	Bright
13	5.3	Bright
14	5.3	Bright
15	5.3	Bright
16	5.3	Bright
17	5.3	Bright
18	5.3	Bright
19	5.3	Bright
20	5.3	Bright
21	5.4	Bright
22	5.4	Bright
23	5.4	Bright
24	5.4	Bright
25	5.4	Bright
26	5.4	Bright
27	5.4	Bright
28	5.4	Bright
29	5.4	Bright
30	5.4	Bright

Planning a trip in September

Hazard calendar for Borba

In seasonPeak

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

Borba's rainy season runs November–May, 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 Borba?

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

2.9

Sightseeing

4th-best month of the year

4.9

Beach & pool

4th-best month of the year

September is a weaker month for outdoor sightseeing in Borba.

What to pack for Borba in September

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

In September, Borba sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

UV index in Borba 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 Borba peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 10 (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)	14	15	15	14	12	10	10	11	10	10	10	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Extreme	Extreme	Very high	Very high	Extreme

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

Air quality in Borba 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 Borba is worst in September — around 27 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (June, 10 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)	14	14	14	13	11	10	11	22	27	26	24	18
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	14	Moderate
Feb	14	Moderate
Mar	14	Moderate
Apr	13	Moderate
May	11	Good
Jun	10	Good
Jul	11	Good
Aug	22	Moderate
Sep	27	Moderate
Oct	26	Moderate
Nov	24	Moderate
Dec	18	Moderate

Location & terrain

Where is Borba?

Borba sits at 4.4°S, 59.6°W, 30 m above sea level, in Brazil. The nearest listed city is Nova Olinda do Norte, 78 km away.

Topography around Borba

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

Within 3 km, the terrain around Borba has only modest variations in elevation — a maximum elevation change of 37 m around an average of 30 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 54 m; within 80 km, only modest variations in elevation — a maximum elevation change of 96 m.

The land around Borba is covered by trees (69%) within 3 km, trees (89%) within 16 km, and trees (93%) within 80 km.

3 km

37 m

trees 69%

16 km

54 m

trees 89%

80 km

96 m

trees 93%

treesgrasslandartificial surfaceswater

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

September weather nearby: Nova Olinda do Norte 78 km · Autazes 104 km · Careiro 111 km · Novo Aripuanã 119 km · Careiro da Várzea 135 km · Iranduba 140 km · Manaquiri 144 km · Manaus 151 km

Brazil travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / N; 127 / 220 V · 60 Hz
Prices: ≈ 46% of US; price level, 2025
GDP per capita: $10,713; 2025
Happiness: 6.6 / 10; World Happiness, 2025
Safe drinking water: 89%; of population, 2024
Homicide rate: 19.3; per 100k, 2023
Road deaths: 16; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Low; EF EPI 482
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 Borba (-4.3914°, -59.5886°, elevation 30 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	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

	Clearer (%)	Cloudier (%)
1	49	51
2	48	52
3	46	54
4	46	54
5	44	56
6	44	56
7	44	56
8	43	57
9	42	58
10	42	58
11	42	58
12	42	58
13	41	59
14	40	60
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	37	63
21	36	64
22	36	64
23	36	64
24	36	64
25	36	64
26	36	64
27	35	65
28	35	65
29	35	65
30	35	65

	Rain chance (%)
1	62
2	62
3	63
4	63
5	63
6	64
7	64
8	64
9	64
10	64
11	65
12	65
13	65
14	64
15	64
16	64
17	64
18	64
19	65
20	65
21	65
22	65
23	65
24	65
25	65
26	64
27	64
28	64
29	64
30	64

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	37	62
2	1	37	62
3	1	37	62
4	1	37	62
5	1	37	62
6	1	37	62
7	1	37	62
8	1	37	62
9	1	37	62
10	1	37	62
11	1	37	62
12	1	36	63
13	1	36	63
14	1	35	64
15	1	35	64
16	1	35	64
17	1	34	65
18	1	34	65
19	1	33	66
20	1	33	66
21	1	33	66
22	1	33	66
23	1	33	66
24	1	33	66
25	1	33	66
26	1	34	65
27	1	34	65
28	1	35	64
29	1	36	63
30	1	36	63

	Avg high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

	Clearer (%)	Cloudier (%)
1	49	51
2	48	52
3	46	54
4	46	54
5	44	56
6	44	56
7	44	56
8	43	57
9	42	58
10	42	58
11	42	58
12	42	58
13	41	59
14	40	60
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	37	63
21	36	64
22	36	64
23	36	64
24	36	64
25	36	64
26	36	64
27	35	65
28	35	65
29	35	65
30	35	65

	Rain chance (%)
1	62
2	62
3	63
4	63
5	63
6	64
7	64
8	64
9	64
10	64
11	65
12	65
13	65
14	64
15	64
16	64
17	64
18	64
19	65
20	65
21	65
22	65
23	65
24	65
25	65
26	64
27	64
28	64
29	64
30	64

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	37	62
2	1	37	62
3	1	37	62
4	1	37	62
5	1	37	62
6	1	37	62
7	1	37	62
8	1	37	62
9	1	37	62
10	1	37	62
11	1	37	62
12	1	36	63
13	1	36	63
14	1	35	64
15	1	35	64
16	1	35	64
17	1	34	65
18	1	34	65
19	1	33	66
20	1	33	66
21	1	33	66
22	1	33	66
23	1	33	66
24	1	33	66
25	1	33	66
26	1	34	65
27	1	34	65
28	1	35	64
29	1	36	63
30	1	36	63

	Avg high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	32	24
15	32	24
16	32	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

	Clearer (%)	Cloudier (%)
1	49	51
2	48	52
3	46	54
4	46	54
5	44	56
6	44	56
7	44	56
8	43	57
9	42	58
10	42	58
11	42	58
12	42	58
13	41	59
14	40	60
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	37	63
21	36	64
22	36	64
23	36	64
24	36	64
25	36	64
26	36	64
27	35	65
28	35	65
29	35	65
30	35	65

	Rain chance (%)
1	62
2	62
3	63
4	63
5	63
6	64
7	64
8	64
9	64
10	64
11	65
12	65
13	65
14	64
15	64
16	64
17	64
18	64
19	65
20	65
21	65
22	65
23	65
24	65
25	65
26	64
27	64
28	64
29	64
30	64

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	37	62
2	1	37	62
3	1	37	62
4	1	37	62
5	1	37	62
6	1	37	62
7	1	37	62
8	1	37	62
9	1	37	62
10	1	37	62
11	1	37	62
12	1	36	63
13	1	36	63
14	1	35	64
15	1	35	64
16	1	35	64
17	1	34	65
18	1	34	65
19	1	33	66
20	1	33	66
21	1	33	66
22	1	33	66
23	1	33	66
24	1	33	66
25	1	33	66
26	1	34	65
27	1	34	65
28	1	35	64
29	1	36	63
30	1	36	63