Click on a day for an hourly weather forecast
The temperatures in Riga in September are usually low and can range between 10°C and 17°C.
You can expect about 3 to 8 days of rain in Riga during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Riga in September 2025.
If you’re planning to visit Riga in the near future, we highly recommend that you review the 14 day weather forecast for Riga before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -5° | 6 | 8 | 18 | 52 mm | Awful | Riga in January |
| February | -1° / -5° | 5 | 7 | 17 | 43 mm | Awful | Riga in February |
| March | 4° / -2° | 7 | 12 | 12 | 48 mm | Awful | Riga in March |
| April | 11° / 2° | 6 | 20 | 4 | 51 mm | Bad | Riga in April |
| May | 17° / 7° | 6 | 25 | 0 | 68 mm | Good | Riga in May |
| June | 21° / 11° | 6 | 24 | 0 | 85 mm | Good | Riga in June |
| July | 24° / 14° | 7 | 24 | 0 | 104 mm | Good | Riga in July |
| August | 22° / 13° | 6 | 25 | 0 | 87 mm | Good | Riga in August |
| September | 17° / 10° | 4 | 26 | 0 | 63 mm | Good | Riga in September |
| October | 11° / 5° | 6 | 24 | 1 | 66 mm | Ok | Riga in October |
| November | 5° / 2° | 7 | 19 | 4 | 64 mm | Awful | Riga in November |
| December | 1° / -2° | 7 | 11 | 14 | 50 mm | Awful | Riga in December |