Riga weather in September 2025

Expect 61°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Riga in September. Check more long-term weather averages for Riga in September before you book your next holiday to Latvia in 2025/2026.

  • 61°F maximum daytime temperature in September in Riga61
    61°F max day temperature
  • 5 hours of sunshine per day
  • 16 days with some rainfall in September in Riga16
    16 days with some rainfall
  • 46°F minimum night-time temperature in September in Riga46
    46°F min night temperature
  • 13 hours of daylight per day in September in Riga13
    13 hours of daylight per day
  • No heat & humidity in September in Riga0
    No heat & humidity
  • 2.9 inches monthly rainfall in September in Riga2.9
    2.9 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Riga3
    3 (Moderate) UV index
  • 59°F sea temperature in September in Riga59
    59°F sea temperature

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The September weather guide for Latvia (Riga) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How warm is it in Riga in September?

Daytime temperatures usually reach 61°F in Riga in September, falling to 46°F at night.

How sunny is it in Riga in September?

There are normally 5 hours of bright sunshine each day in Riga in September - that's 40% of daylight hours.

How warm is the sea around Riga in September?

The average sea temperature around Riga in September is 59°F.

Does it rain in Riga in September?

There are usually 16 days with some rain in Riga in September and the average monthly rainfall is 2.9 inches.

Riga September sunrise & sunset times

Browse the sunrise and sunset times for Riga in September 2025. Select a month to view Riga sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 19:20
Monday, 15th September 2025 05:55 18:42
Tuesday, 30th September 2025 06:25 18:01

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