September · Latvia
Best time to visit Riga in September Weather, crowds & prices
Weather in Riga in September
Average temperature 15°C, 44 mm of rain, about 26 days with 6+ hours of sunshine and 80% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
9.1/10
Ranked #1 of 12 months
- Avg temp
- 15°C
- Rainfall
- 44 mm
- Humidity
- 80%
- Days with 6h+ sun
- 26
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
September in Riga scores 9.1/10 for sightseeing and cultural travel - the single best month of the year. Expect around 15°C, 44 mm of rain, and roughly 26 days with 6+ hours of sunshine this month.
Art Nouveau facades fill Alberta iela, a short walk from Riga's medieval Old Town and the Daugava.
September in Riga tops the year's climate scores
Temperatures hover around 15°C (58°F) — the kind of month where neither heat nor cold forces the schedule.
With around 44 mm of rain, any showers tend to pass through rather than settle in; about 26 days with 6+ hours of sunshine and 12.8 hours of daylight fill the rest.
On our climate-comfort scale this is the top-ranked month of the year for Riga at 9.1/10 — the reference point every other month on this page is measured against.
Pack layers you can shed by midday plus one warm layer for the evening.
Budget for peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Riga in September?
- In September, Riga averages 15°C, 44 mm of rain, and about 26 days with 6+ hours of sunshine. Its climate-comfort score is 9.1/10.
- Is September a good time to visit Riga?
- September earns a 9.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Riga in September?
- Expect about 44 mm of rain in September. Average humidity is 80% and there are about 26 days with 6+ hours of sunshine.
Curated in Riga
Tickets & experiences
Things to do in Riga
Riga, Latvia. Live activities and tours from GetYourGuide, matched to this destination.