Riga Weather in September

🇱🇻 Latvia

17°C

High

10°C

Low

Rain Days

Sunshine

65%

Humidity

Europe › 🇱🇻 Latvia › Riga

Updated: March 2026

Is September a Good Time to Visit Riga?

6/10

Good

September is a good time to visit Riga (6/10). With 9 daily sunshine hours and only 11 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 6th sunniest of the year in Riga. Culture-focused travellers and those who prefer lighter crowds will find September a practical choice, with prices running lower than peak June without sacrificing all the good weather. October offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Riga's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.

vs August:22°C avg high

Based on 30-year climate normals (1991 to 2020), September in Riga averages 17°C by day and 10°C overnight, a range that places it in the temperate middle ground of the year. The month records approximately 9 sunshine hours per day and 68mm of total rainfall across 11 wet days, giving it a sunshine-to-rain ratio that is broadly workable for most itineraries.

17°C

Avg High

10°C

Avg Low

11 days

Rain Days

Sunshine

65%

Humidity

Temperature in Riga in September

The 7°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 21 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 63°F average high, 50°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in September

Monthly Precipitation (mm)

What to Wear in Riga in September

Morning10°CBefore the day warms up

Afternoon17°CPeak daytime temperature

Evening13°CAfter sunset cools down

Packing for Riga in September means dressing for 17°C days and 10°C evenings. A mid-weight jacket over a sweater handles 17°C daytime temperatures; the combination stays comfortable all day without overheating. Evening temperatures settle at 10°C, a modest 7°C drop that a light cardigan or denim jacket covers. European cobblestones reward low-profile walking shoes over flip-flops or heels, with cushioned trainers or leather walking shoes being the practical choice. A compact foldable umbrella weighs almost nothing and earns its keep across 11 potential rainy days.

💡

Local tip: Riga's cobbled streets turn slippery in the rain. Waterproof walking shoes with a non-slip sole outperform fashionable footwear on wet stone, and you'll cover significantly more ground in comfort.

Events in Riga in September

September has no major festivals or public holidays in Riga, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Riga in September

Based on 17°C average highs and 11 rainy days

Light jacket or cardigan for cooler evenings
Mix of short and long-sleeve layers
Comfortable walking shoes with good arch support
Compact folding umbrella
Waterproof outer layer or packable rain jacket
Quick-dry clothing that recovers fast after a shower
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in Riga in September

Explore the old town's cobblestone backstreetsMorning (9-11am)At 17°C, conditions are pleasant for unhurried exploration on foot
Visit hilltop viewpoints for panoramic city viewsLate afternoon (4-6pm)Low sun angle creates dramatic light for photography while temperatures remain comfortable
Bicycle rental for a half-day city circuitMid-morning startMild 17°C temperatures are ideal for extended cycling without excessive effort
Boat tour of the river, bay, or canal networkLate morning departureComfortable weather makes open-deck boats viable without wind-chill concerns
Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmSeptember seasonal produce is at peak availability, offering dishes not found at other times of year

Why is Riga mild in September?

September brings the first meaningful shift toward cooler conditions in Riga, as the sun angle drops and day length shortens. Temperatures averaging 17°C by day and 10°C overnight are still comfortable by most standards, but the trend is clearly downward. At 57 degrees north latitude, autumn light has a particular quality: lower in the sky and warmer in tone, it gives the city a photogenic quality quite different from summer. Evening temperatures already demand a jacket, but midday hours stay pleasant for sightseeing. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Riga in September

In September, Riga experiences average highs of 17°C (63°F) and lows of 10°C (50°F). Expect around 11 rainy days and 9 hours of sunshine per day, with humidity averaging 65%. The 7°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an extra jacket is essential for evenings. UV index averages 6, so sun protection is advisable on clear days.

Riga typically sees 11 rainy days in September, with total precipitation of around 68mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Riga typically sees 4-6 fewer rain days than September.

Pack a warm jacket, sweaters, and layering pieces for Riga in September. Temperatures can drop to 10°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is important with 11 rainy days expected. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.

Yes, September is an excellent time to visit Riga. With 9 daily sunshine hours and only 11 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 17°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.

The average high temperature in Riga in September is 17°C (63°F), and the average low is 10°C (50°F). The mean daily temperature is approximately 14°C (56°F). The day-to-night range of 7°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.

The best month to visit Riga is generally June. June offers the most sunshine at 13 hours per day and only 11 rainy days. Average temperatures reach 20°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around June gives you the best chance of dry, bright weather.

September is shoulder or low season in Riga, meaning fewer tourists and generally lower prices than peak months. With 9 sunshine hours and 11 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.

In September, Riga suits a range of activities thanks to cool conditions around 17°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 9 hours of sunshine, parks and waterfront walks are particularly enjoyable.

September ranks 6th sunniest of the year in Riga, with an average 9 daily sunshine hours. The driest months are February, March, and April. July is the hottest month (22°C avg high); January is the coolest (-1°C). From here, temperatures fall 7°C into October. Compared to last month (August: 22°C high, 13 rain days), September is cooler and drier. September sits in the middle of the annual sunshine ranking for Riga, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	-1°C	-5°C	12	2h	View
February	0°C	-5°C	10	4h	View
March	4°C	-3°C	10	7h	View
April	11°C	2°C	10	10h	View
May	16°C	7°C	10	12h	View
June	20°C	12°C	11	13h	View
July	22°C	15°C	12	13h	View
August	22°C	14°C	13	12h	View
September	17°C	10°C	11	9h	View
October	10°C	5°C	14	5h	View
November	4°C	1°C	13	3h	View
December	1°C	-3°C	12	2h	View

Other Months in Riga

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Riga

Best Time to Visit Riga Riga vs Minsk in September Riga vs Stockholm in September

Nearby Destinations with Similar Weather

These cities are within 500 km and experience broadly comparable weather conditions during the same calendar month, making them practical standalone alternatives or worthwhile additions to a longer regional itinerary.

Minsk🇧🇾 Belarus402 km away

10°C-2°C low

Stockholm🇸🇪 Sweden442 km away

16°C10°C low

Helsinki🇫🇮 Finland362 km away

15°C10°C low

Vilnius🇱🇹 Lithuania262 km away

17°C10°C low

Data Sources for Riga

Riga on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.