Porto Velho weather in September 2025

Expect daytime maximum temperatures of 33°C in Porto Velho in September and very high heat and humidity based on long-term weather averages. There are 5 hours of sunshine per day on average with typically 112 mm of rainfall in the month.

  • 33°C maximum daytime temperature in September in Porto Velho33
    33°C max day temperature
  • 5 hours of sunshine per day
  • 9 days with some rainfall in September in Porto Velho9
    9 days with some rainfall
  • 21°C minimum night-time temperature in September in Porto Velho21
    21°C min night temperature
  • 12 hours of daylight per day in September in Porto Velho12
    12 hours of daylight per day
  • Very high heat & humidity in September in Porto VelhoVH
    Very High heat & humidity
  • 112 mm monthly rainfall in September in Porto Velho112
    112 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Porto Velho11
    11+ (Extreme) UV index

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Porto Velho by month

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The September weather guide for Brazil (Porto Velho) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Porto Velho in September?

Daytime temperatures usually reach 33°C in Porto Velho in September with very high heat and humidity, falling to 21°C at night.

How sunny is it in Porto Velho in September?

There are normally 5 hours of bright sunshine each day in Porto Velho in September - that's 42% of daylight hours.

Does it rain in Porto Velho in September?

There are usually 9 days with some rain in Porto Velho in September and the average monthly rainfall is 112mm.

Porto Velho September sunrise & sunset times

Browse the sunrise and sunset times for Porto Velho in September 2025. Select a month to view Porto Velho sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:17 18:14
Monday, 15th September 2025 06:09 18:12
Tuesday, 30th September 2025 06:00 18:11

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