Weather in Riga 🇱🇻
Monthly weather averages & travel planning
September
Avg Temp
10°C
Rain Days
4 days
Sun Hours
4 hrs
Humidity
65%
Europe › 🇱🇻 Latvia › Riga
Updated: March 2026
Is September a Good Time to Visit Riga?
5/10
Fair
September is a fair time to visit Riga (5/10). Average highs of 10°C and 4 sunshine hours daily make conditions workable, though not exceptional. Culture-focused travellers and those who prefer lighter crowds will find September a practical choice, with prices running lower than peak May 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:17°C avg high
Based on 30-year climate normals (1991 to 2020), September in Riga averages 10°C by day and -2°C overnight, a range that places it at the cooler end of the annual distribution. The month records approximately 4 sunshine hours per day and 50mm of total rainfall across 4 wet days, giving it a sunshine-to-rain ratio that is better suited to a flexible schedule with indoor alternatives built in.
10°C
50°F
Avg High
-2°C
28°F
Avg Low
4 days
50 mm total
Rain Days
4h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Riga in September
The 12°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 15 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 50°F average high, 28°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Riga in September
Morning-2°CBefore the day warms up
Afternoon10°CPeak daytime temperature
Evening1°CAfter sunset cools down
Packing for Riga in September means dressing for 10°C days and -2°C evenings. Layering is key: a thermal base, mid-layer fleece, and a windproof outer jacket for 10°C highs that feel colder in the wind. Evenings drop 12°C to around -2°C, a notable shift that catches underprepared visitors off guard. Pack a dedicated evening layer. European cobblestones reward low-profile walking shoes over flip-flops or heels, with cushioned trainers or leather walking shoes being the practical choice.
Local tip: Many of Riga's museums and galleries maintain cool interior temperatures regardless of outdoor conditions. A compact layer in your daypack lets you move between warm streets and chilled exhibition halls without discomfort.
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 10°C average highs and 4 rainy days
- Warm jacket (down or fleece)
- Merino wool base layer (regulates temperature and resists odour)
- Sweaters and lined trousers
- Scarf and lightweight gloves
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Riga in September
- Vigorous walking tour of the UNESCO heritage districtMidday (12-2pm)The 10°C peak temperature provides ideal conditions for brisk sightseeing walks
- Cycling the riverside or park circuitAfternoon (1-4pm)Cool dry air makes long cycling sessions comfortable without overheating
- Explore hilltop viewpoints and fortressesMorning for clear viewsCold-weather atmospheric clarity gives the longest sightlines of the year
- Open-air Christmas or seasonal marketsAfternoon into eveningCool temperatures make festive outdoor markets genuinely atmospheric
- 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
- Warm up with traditional hot dishes: local stew, fondue, or braised specialities at a neighbourhood restaurantLunch (12-2pm) or dinner (7-9pm)Cold-weather cuisine is a genuine cultural experience and the best local restaurants serve their heartiest dishes in cooler months
Why is Riga cool in September?
September brings the first meaningful shift toward cooler conditions in Riga, as the sun angle drops and day length shortens. Temperatures averaging 10°C by day and -2°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 10°C (50°F) and lows of -2°C (28°F). Expect around 4 rainy days and 4 hours of sunshine per day, with humidity averaging 65%. The 12°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 4 rainy days in September, with total precipitation of around 50mm. This makes September one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. 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 -2°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is a sensible precaution even though rain days are limited. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.
September is a reasonable time to visit Riga. Expect 4 rainy days, so pack a light rain layer for flexibility. Average temperatures of 10°C make outdoor exploration comfortable during the dry periods. With 4 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Riga in September is 10°C (50°F), and the average low is -2°C (28°F). The mean daily temperature is approximately 4°C (39°F). The day-to-night range of 12°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 May. May offers the most sunshine at 7 hours per day and only 6 rainy days. Average temperatures reach 22°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around May 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 4 sunshine hours and 4 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 10°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. Cosy cafes and cultural venues make ideal retreats on overcast days.
September ranks 7th sunniest of the year in Riga, with an average 4 daily sunshine hours. The driest months are January, February, and October. June is the hottest month (23°C avg high); December is the coolest (-3°C). From here, temperatures fall 7°C into October. Compared to last month (August: 17°C high, 5 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 | -2°C | -14°C | 3 | 1h | View |
| February | 3°C | -9°C | 3 | 3h | View |
| March | 10°C | -2°C | 4 | 4h | View |
| April | 17°C | 5°C | 5 | 6h | View |
| May | 22°C | 10°C | 6 | 7h | View |
| June | 23°C | 11°C | 6 | 7h | View |
| July | 22°C | 10°C | 6 | 7h | View |
| August | 17°C | 5°C | 5 | 6h | View |
| September | 10°C | -2°C | 4 | 4h | View |
| October | 3°C | -9°C | 3 | 3h | View |
| November | -2°C | -14°C | 3 | 1h | View |
| December | -3°C | -15°C | 3 | 1h | View |
January
3 rain days, 1h sun
-2°-14°
February
3 rain days, 3h sun
3°-9°
March
4 rain days, 4h sun
10°-2°
April
5 rain days, 6h sun
17°5°
May
6 rain days, 7h sun
22°10°
June
6 rain days, 7h sun
23°11°
July
6 rain days, 7h sun
22°10°
August
5 rain days, 6h sun
17°5°
September
4 rain days, 4h sun
10°-2°
October
3 rain days, 3h sun
3°-9°
November
3 rain days, 1h sun
-2°-14°
December
3 rain days, 1h sun
-3°-15°
Other Months in Riga
Plan Your Trip to Riga
Nearby Destinations
Cities within 500 km with comparable weather conditions
Data Sources for Riga
Climate normals represent 30-year averages (1991-2020). Individual years may vary.