September weather forecast and climate
Rio Bom, Portugal

Weather in September

September, the first month of the autumn, in Rio Bom, is also a moderately hot month, with temperature in the range of an average low of 11.3°C (52.3°F) and an average high of 25.7°C (78.3°F).

Temperature

In September, the average high-temperature marginally drops, from 29.1°C (84.4°F) in August, to a still moderately hot 25.7°C (78.3°F). In Rio Bom, in September, the average low-temperature is 11.3°C (52.3°F).

Humidity

The average relative humidity in Rio Bom is 60%.

Rainfall

In Rio Bom, in September, during 6.3 rainfall days, 18mm (0.71") of precipitation is typically accumulated. Throughout the year, there are 127.3 rainfall days, and 455mm (17.91") of precipitation is accumulated.

Snowfall

March through December are months without snowfall.

Daylight

The average length of the day in September is 12.5h.

Sunshine

In September, the average sunshine is 9.4h.

UV index

In Rio Bom, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Rio Bom?

In September, in Rio Bom, Portugal, the average high-temperature is 25.7°C (78.3°F), and the average low-temperature is 11.3°C (52.3°F).

What is the average humidity in September in Rio Bom?

The average relative humidity in September is 60%.

How many days does it rain in September in Rio Bom?

In Rio Bom, Portugal, in September, during 6.3 rainfall days, 18mm (0.71") of precipitation is typically accumulated.

When it does not snow in Rio Bom?

In Rio Bom, Portugal, snow does not fall in March through December.

How many hours of daylight does Rio Bom have in September?

In Rio Bom, the average length of the day in September is 12.5h.

How many hours of sunshine does Rio Bom have in September?

In September, the average sunshine in Rio Bom, Portugal, is 9.4h.

What is the UV index intensity in September in Rio Bom?

In September, the average daily maximum UV index in Rio Bom is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Rio Bom, Portugal

Average temperature in September - Rio Bom, Portugal
  • Average high temperature in September: 25.7°C

The warmest month (with the highest average high temperature) is August (29.1°C).
The month with the lowest average high temperature is January (8.9°C).

  • Average low temperature in September: 11.3°C

Months with the highest average low temperature are July and August (13.1°C).
The coldest month (with the lowest average low temperature) is February (1.5°C).

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Average pressure in September
Rio Bom, Portugal

Average pressure in September - Rio Bom, Portugal
  • Average pressure in September: 1017.6mbar

The month with the highest atmospheric pressure is December (1022.7mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).

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Average wind speed in September
Rio Bom, Portugal

Average wind speed in September - Rio Bom, Portugal
  • Average wind speed in September: 6.5km/h

The windiest month (with the highest average wind speed) is March (8.3km/h).
The calmest months (with the lowest average wind speed) are September and October (6.5km/h).

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Average humidity in September
Rio Bom, Portugal

Average humidity in September - Rio Bom, Portugal
  • Average humidity in September: 60%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (56%).

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Average rainfall in September
Rio Bom, Portugal

Average rainfall in September - Rio Bom, Portugal
  • Average rainfall in September: 18mm

The wettest month (with the highest rainfall) is December (72mm).
The driest months (with the least rainfall) are July and August (11mm).

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Average rainfall days in September
Rio Bom, Portugal

Average rainfall days in September - Rio Bom, Portugal
  • Average rainfall days in September: 6.3 days

The month with the highest number of rainy days is April (14.6 days).
The month with the least rainy days is August (3.8 days).

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Average snowfall in September
Rio Bom, Portugal

Average snowfall in September - Rio Bom, Portugal
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (5mm).
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in September
Rio Bom, Portugal

Average snowfall days in September - Rio Bom, Portugal
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.3 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Rio Bom, Portugal

Average daylight in September / Average sunshine in September - Rio Bom, Portugal
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 11.5h).
The month with the least sunshine is January (Average sunshine: 4.4h).

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Average sunshine days in September
Rio Bom, Portugal

Average sunshine days in September - Rio Bom, Portugal
  • Average sunshine days in September: 21.8 days

The month with the most sunshine days is August (25.5 days).
The month with the least sunshine days is November (13.5 days).

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Average UV index in September
Rio Bom, Portugal

Average UV index in September - Rio Bom, Portugal
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Rio Bom, Portugal

Average cloud cover in September - Rio Bom, Portugal
  • Average cloud cover in September: 23

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in September
Rio Bom, Portugal

Average visibility in September - Rio Bom, Portugal
  • Average visibility in September: 9km

The month with the highest visibility is August (10km).
The month with the lowest visibility is January (6km).

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