Riga weather in September
September in Riga: cool, a little rain, with clean air — a great time to visit.
#5 of 12 months in Riga · #326 of 604 destinations to visit in September · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Riga climate normals — September
| Daytime high | 17°C / 62°F | 🙂 cool |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Feels like (high) | 15°C / 59°F | |
| Rainfall | 63 mm / 2.5 in | 🌦 some rain |
| Rainy days | 12 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 10°C / 50°F | |
| Sunshine | 8.6 h/day | |
| Daylight | 12.8 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Riga in September — FAQ
- Is September a good time to visit Riga?
- September in Riga: cool, a little rain, with clean air — a great time to visit. It ranks #5 of 12 months for Riga on SeasonMap's comfort score (79/100).
- What is the weather like in Riga in September?
- In September, Riga averages a daily high of 16.9°C and a low of 10.6°C, with about 63 mm of rain over roughly 12.2 rainy days.
- What is the air quality in Riga in September?
- Riga has a mean US Air Quality Index of about 37 in September.