Weather in Riga in September 2025
Average weather
Average temperature in Riga in September
Going from a maximum of +27°C during the day to a minimum of +7°C during the night, the temperature in September averages around +21°C.
The average maximum temperature goes down 5% by the end of the month, compared with the beginning of the month, from +19°C to +18°C.
Is Riga warm or cold in September?
Riga is typically mild in September.
Maximum temperatures go down compared to the previous month from +21°C to +16°C. The minimum temperature also goes down from +13°C to +9°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Riga:
Climate in Riga in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +21°C | +16°C | +10°C | ||||
| Min. temperature | ||||||
| +5°C | -2°C | -9°C | ||||
| Max. temperature | ||||||
| +33°C | +28°C | +20°C | ||||
| Rainfall | ||||||
| 77 mm | 58 mm | 60 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Humidity | ||||||
| 77% | 81% | 84% | ||||
| Air pressure | ||||||
| 1012 HPa | 1013 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 6 | 5 | 4 | ||||
| Cloudy days | ||||||
| 5 | 8 | 10 | ||||
| Rainy days | ||||||
| 16 | 16 | 15 | ||||
| Snowy days | ||||||
| 0 | 0 | 1 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +21°C in the day, the average maximum temperature lowers to +16°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 77 mm to 58 mm. Humidity rises from 77% to 81%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 6 sunny days in August to 5 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Riga is gradually decreasing during September, going from 4 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Riga?
Climate Change over Years
The climate in Riga in September has not changed much over the last 43 years.
The average temperature was the lowest in 1985 (+8°C) and the highest in 2020 (+13°C). The driest year was 1996 with only 342 mm of rainfall, and the wettest year was 2023 with 1096 mm.
FAQ
Is September a good time to visit Riga?
Can you sunbathe in Riga in September?
Is Riga rainy in September?
Is it sunny in Riga in September?
Monthly weather in Riga
Source of the data
For this page, we’ve looked at the typical weather in Riga, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.