Riga
Latvia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Riga, Latvia

A sunny day in Riga, Latvia, with a view of the river and a clear skyscape
A sunny day in Riga, Latvia, with a view of the river and a clear skyscape
The first month of the autumn, September, is also an enjoyable month in Riga, Latvia, with average temperature fluctuating between 8°C (46.4°F) and 16.3°C (61.3°F).

Temperature

In Riga, the average high-temperature slightly decreases, from an agreeable 21°C (69.8°F) in August, to an enjoyable 16.3°C (61.3°F). In Riga, Latvia, the average low-temperature is 8°C (46.4°F).

Humidity

The average relative humidity in Riga, Latvia, is 81.1%.

Rainfall

The month with the most rainfall in Riga is September when the rain falls for 13 days and typically aggregates up to 78.9mm (3.1") of precipitation.

Sea temperature

In September, the average sea temperature in Riga is 15°C (59°F).
Note: For swimming, a surface water temperature of 15°C (59°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

In September, the average length of the day is 12.8h.

Sunshine

In September, the average sunshine in Riga, Latvia, is 5.1h.

UV index

In September, the average daily maximum UV index in Riga is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Riga?

In Riga, Latvia, in September, the average high-temperature is 16.3°C (61.3°F), and the average low-temperature is 8°C (46.4°F).

What is the average humidity in September in Riga?

In Riga, the average relative humidity in September is 81.1%.

How much does it rain in Riga in September?

In Riga, Latvia, during September, the rain falls for 13 days and regularly aggregates up to 78.9mm (3.1") of precipitation.

What is the rainiest month in Riga?

September is the month with the most rainfall in Riga. Rain falls for 13 days and accumulates 78.9mm (3.1") of precipitation.

How cold is the water in September in Riga?

In Riga, Latvia, the average seawater temperature in September is 15°C (59°F). Swimming in 15°C (59°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in September in Riga?

In September, the average length of the day in Riga is 12.8h.

How long on average sun shines in September in Riga?

The average sunshine in September is 5.1h.

What is the UV index intensity in September in Riga?

In Riga, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Riga, Latvia
  • Average high temperature in September: 16.3°C

The warmest month (with the highest average high temperature) is July (21.7°C).
The month with the lowest average high temperature is January (-2.3°C).

  • Average low temperature in September: 8°C

The month with the highest average low temperature is July (12.3°C).
The coldest month (with the lowest average low temperature) is January (-7.8°C).

Average humidity in September - Riga, Latvia
  • Average humidity in September: 81.1%

The month with the highest relative humidity is November (90.2%).
The month with the lowest relative humidity is May (67.7%).

Average rainfall in September - Riga, Latvia
  • Average rainfall in September: 78.9mm

The wettest month (with the highest rainfall) is September (78.9mm).
The driest month (with the lowest rainfall) is February (27mm).

Average rainfall days in September - Riga, Latvia
  • Average rainfall days in September: 13 days

The month with the highest number of rainy days is January (21.5 days).
The month with the lowest number of rainy days is April (11 days).

Average sea temperature in September - Riga, Latvia
  • Average sea temperature in September: 15°C

The best month for swimming (with the highest average sea temperature) is August (17°C).
Coldest months (with the lowest average sea temperature) are February and March (1°C).

Average daylight in September / Average sunshine in September - Riga, Latvia
  • Average daylight in September: 12.8h

The month with the longest days is June (Average daylight: 17.8h).
The month with shortest days is December (Average daylight: 6.9h).

  • Average sunshine in September: 5.1h

The month with most sunshine is June (Average sunshine: 9.6h).
The month with least sunshine is December (Average sunshine: 0.7h).

Average UV index in September - Riga, Latvia
  • Average UV index in September: 3

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are January, November and December (UV index 0).