Rīga Weather in September

Thinking of visiting Rīga in September? Expect pleasant temperatures reaching 18°C (64°F) during the day, dropping to 10°C (50°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Rīga in September

The climate data from previous years indicates about 16 days of rain, averaging 75 mm (3 in) for the month. This is a month with many wet days but modest rainfall totals, so showers are generally light and easy to manage.

Temperature in Rīga in September

Daytime highs in Rīga in September reach 18°C (64°F), with nights around 10°C (50°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Rīga in September

The area experiences a moderate amount of sunshine, with approximately 154 hours of sunlight expected. This means a decent mix of sun and overcast.

Wind Speed in Rīga in September

September sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

Average water temperature in September

The water sits at 7°C (45°F) this month, which is well below what most people consider swimmable. Wetsuits help, but expect it to still feel cold.

If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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Check the conditions for any month of the year.

• January
• February
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• May
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• October
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• December

For a detailed overview over the year and the best time to visit Latvia, check out our Rīga's climate page.

Rīga Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 18°C (64°F)  

Water Temperature 7°C (45°F)  

Chance of Rain 54%  

Precipitation 75 mm (3 in)  

Rainy days 16 days  

Humidity 81%  

Windspeed 4 m/s (8 knots)  

Sunshine 154 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Rīga typically drop from around 19°C (66°F) at the start of September to approximately 14°C (57°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 11°C (52°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Rīga in September

Browse day-by-day weather records for Rīga spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Rīga historical weather extremes in September

Based on weather observations in Rīga between 1976 and 2025, these are the recorded extremes during September.

• On September 4, 2024, temperatures climbed to 29°C (84°F), marking the warmest September day on record.
• The lowest daytime temperature in September was 7°C (45°F), recorded on September 26, 1986.
• Nighttime temperatures dropped to -5°C (23°F) on September 30, 1993, marking the coldest September night on record.

What to Wear in Rīga in September

For Rīga in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. The water temperature sits at about 7°C (45°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Rīga in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Latvia, check out our Rīga's climate page.

More climate data for Rīga

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Rīga climate overview or explore weather in Latvia.