Cosmópolis, Brazil — Weather in September 2026

Climate Overview

Cosmópolis, Brazil in September has hot conditions, with highs reaching 30.5°C (87°F) and afternoons the warmest part of the day. Temperatures drop noticeably between day and night.

This month falls at the beginning of Spring. Temperatures are at their seasonal peak.

Temperatures remain fairly steady throughout September, with daily highs around 30°C (86°F).

Rainfall is heaviest during the last third of the month, while the first third tends to be drier.

The warmest days tend to fall around the 11th, averaging 31.9°C (89°F).

Compared to August, this month is about 4°C warmer with 1 more rainy days.

Monthly September Averages

Temperature

31°C / 17°C

Feels Like

31°C / 17°C

Rain

5 days · 38 mm

Sunshine

10.3h / day

Humidity

57% — Moderate

Wind

17 km/h

Wind Direction

ESE (109°)

Gusts

36 km/h

Daylight

12 h

Cloud Cover

39%

Clear Sky Days

11.2

UV Index

7.8 — Very High

Dew Point

15°C — Comfortable

Moon Phase

Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

High Low

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:05

Daylight 12h

Sunset 18:03

Compare Months

1days (8 mm) Excellent

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	29°C / 21°C	33°C / 23°C	20days (228 mm) Wet	9.9h Good	77% Humid	8.9 Very High	Wet	View Details
February	29°C / 20°C	33°C / 23°C	16days (153 mm) Wet	9.9h Good	76% Humid	8.4 Very High	Fair	View Details
March	29°C / 20°C	33°C / 22°C	14days (103 mm) Wet	10.2h Excellent	75% Muggy	8 Very High	Good	View Details
April best	28°C / 18°C	30°C / 19°C	6days (57 mm) Good	9.7h Good	71% Muggy	6.8 High	Excellent	View Details
May best	26°C / 15°C	26°C / 15°C	5days (41 mm) Good	9.2h Good	69% Muggy	5.6 High	Excellent	View Details
June best	25°C / 13°C	24°C / 13°C	5days (41 mm) Good	9h Good	71% Muggy	5 Moderate	Excellent	View Details
July best	25°C / 13°C	25°C / 11°C	1days (8 mm) Excellent	9.6h Good	62% Muggy	5.4 High	Excellent	View Details
August best	27°C / 14°C	26°C / 13°C	4days (35 mm) Good	9.4h Good	61% Muggy	6.3 High	Excellent	View Details
September	31°C / 17°C	31°C / 17°C	5days (38 mm) Good	10.3h Excellent	57% Moderate	7.8 Very High	Excellent	View Details
October	30°C / 19°C	32°C / 19°C	13days (120 mm) Wet	10h Excellent	68% Muggy	8.2 Very High	Good	View Details
November	29°C / 19°C	32°C / 19°C	13days (134 mm) Wet	10.4h Excellent	70% Muggy	8.5 Very High	Good	View Details
December	29°C / 20°C	33°C / 22°C	17days (168 mm) Wet	10.5h Excellent	73% Muggy	8.9 Very High	Fair	View Details

What to Wear

Light, breathable fabrics like cotton and linen are essential. Opt for loose-fitting clothing in light colors to stay cool.

Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.

Packing List

Breathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

Expand all

Is September a good time to visit Cosmópolis?

September is typically excellent for visiting Cosmópolis, with average highs of 31°C (87°F) and around 5 rainy days. Cosmópolis, Brazil in September has hot conditions, with highs reaching 30.5°C (87°F) and afternoons the warmest part of

Does it rain a lot in Cosmópolis in September?

Cosmópolis typically sees around 5 rainy days in September with 38 mm (1.5 in) of total rainfall. An umbrella should suffice.

Does it get cold at night in Cosmópolis in September?

Evenings in Cosmópolis during September are mild at 17°C (63°F). A light cardigan is usually enough.

What should I pack for Cosmópolis in September?

With highs of 31°C (87°F) and lows of 17°C (63°F) in September, we recommend: Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Comfortable walking shoes. Comfortable walking shoes are essential.

Is September among the best months weather-wise in Cosmópolis?

September is not the most favourable month weather-wise in Cosmópolis. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Cosmópolis in September?

The average UV index in Cosmópolis during September is 8 (very high). Strong sun protection is essential — SPF 50+, protective clothing, and avoid prolonged outdoor exposure during peak hours.

How many hours of daylight are there in Cosmópolis in September?

Cosmópolis gets approximately 12 hours of daylight per day in September, with around 10 hours of sunshine.

Does it snow in Cosmópolis in September?

Snow is uncommon in Cosmópolis during September based on 10-year climate averages.

Last updated: