September weather forecastRiga, Latvia
September
Weather in September
September brings a marked shift in Riga's weather, serving as an annunciator of the upcoming autumn season. The city's vegetation takes on hues of orange and red, replacing the greens of summer. With a decrease to 32mm (1.26") of rain, the balance between wet and dry days marks an optimal time for excursions. The drop in temperatures and the shortening daylight hours offer a beautiful blend of summer's end and the arrival of fall.Temperature
September's onset in Riga, Latvia, brings a negligible change in high-temperatures, falling from an agreeable 21.5°C (70.7°F) in August to an enjoyable 16.8°C (62.2°F). Riga's temperature tends to fall to an average low of 10.8°C (51.4°F) during the nights of September.Humidity
In Riga, the average relative humidity in September is 78%.Rainfall
In Riga, in September, it is raining for 14.7 days, with typically 32mm (1.26") of accumulated precipitation. Throughout the year, in Riga, there are 142 rainfall days, and 382mm (15.04") of precipitation is accumulated.Snowfall
May through September are months without snowfall in Riga.Sea temperature
In Riga, the average seawater temperature in September is 15°C (59°F).Note: Most people find it challenging to enjoy swimming in water that is 15°C (59°F). As water temperature falls below 21°C (69.8°F), controlling breathing grows increasingly difficult.
Daylight
In September, the average length of the day in Riga, Latvia, is 12h and 46min.On the first day of the month, sunrise is at 06:27 and sunset at 20:19. On the last day of September, in Riga, sunrise is at 07:26 and sunset at 19:00 EEST.
Sunshine
In Riga, the average sunshine in September is 7.7h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 3 during September leads to these instructions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Riga, Latvia
- Average high temperature in September: 16.8°C
The warmest month (with the highest average high temperature) is July (22.4°C).
The month with the lowest average high temperature is January (-1.3°C).
- Average low temperature in September: 10.8°C
The month with the highest average low temperature is July (14.5°C).
The coldest month (with the lowest average low temperature) is January (-4.8°C).
Average pressure in September
Riga, Latvia
- Average pressure in September: 1015.4mbar
The month with the highest atmospheric pressure is October (1016.1mbar).
The month with the lowest atmospheric pressure is December (1011.4mbar).
Average wind speed in September
Riga, Latvia
- Average wind speed in September: 15.5km/h
The windiest month (with the highest average wind speed) is December (18.9km/h).
The calmest month (with the lowest average wind speed) is May (13.1km/h).
Average humidity in September
Riga, Latvia
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Riga, Latvia
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is July (47mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in September
Riga, Latvia
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is February (6 days).
Average snowfall in September
Riga, Latvia
- Average snowfall in September: 0mm
The month with the highest snowfall is January (84mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Riga, Latvia
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 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).
The 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: 12h and 48min
The month with the longest days is June (Average daylight: 17h and 48min).
The month with the shortest days is December (Average daylight: 6h and 54min).
- Average sunshine in September: 7h and 42min
The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average sunshine days in September
Riga, Latvia
- Average sunshine days in September: 13 days
The month with the most sunshine days is April (16.8 days).
The month with the least sunshine days is December (10.1 days).
Average UV index in September
Riga, Latvia
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Riga, Latvia
- Average cloud cover in September: 46
The month with the most cloud cover is December (Cloud cover 79).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Riga, Latvia
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January and February (8km).
