Climate averages 1991–2020
Riga weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Riga: daytime highs average 16.6°C and nights cool to about 10.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 70 mm of rain on roughly 12 days, which makes September a moderately wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 51 min on an average September day.
The nearest other city in this atlas is Šiauliai (123 km away). In September its highs average 16.3°C, about as warm as Riga, with 51 mm of rain.
Among the 2 cities listed in Latvia, Riga ranks 1st of 2 for the warmest September highs and 2nd of 2 for the driest September (rainfall, lowest first). The mean September high of those 2 cities is 16.3°C; Riga is 0.3°C warmer than that mean.
From September to October, average highs fall by 6.6°C to 10.0°C, and monthly rainfall rises from 70 mm to 80 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Riga climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.8°C-4.9°C | -4.9°C | 46 | 11.2 | 7.57 h |
| February | -0.4°C-5.3°C | -5.3°C | 39 | 9.9 | 9.49 h |
| March | 3.9°C-2.7°C | -2.7°C | 38 | 9.7 | 11.812 h |
| April | 10.8°C2.3°C | 2.3°C | 41 | 9.2 | 14.214 h |
| May | 16.4°C7.8°C | 7.8°C | 52 | 10.3 | 16.516 h |
| June | 20.0°C12.2°C | 12.2°C | 73 | 11.3 | 17.718 h |
| July | 22.4°C15.0°C | 15.0°C | 70 | 11.7 | 17.217 h |
| August | 21.6°C14.5°C | 14.5°C | 79 | 13.0 | 15.215 h |
| September, selected | 16.6°C10.5°C | 10.5°C | 70 | 11.6 | 12.913 h |
| October | 10.0°C5.3°C | 5.3°C | 80 | 14.2 | 10.410 h |
| November | 4.4°C1.0°C | 1.0°C | 59 | 12.8 | 8.28 h |
| December | 0.8°C-2.6°C | -2.6°C | 49 | 12.0 | 6.97 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Šiauliai in SeptemberLithuania · 123 kmHigh 16.3°C · Low 9.3°C · 51 mm rain
- Panevėžys in SeptemberLithuania · 136 kmHigh 16.8°C · Low 10.0°C · 50 mm rain
- Daugavpils in SeptemberLatvia · 190 kmHigh 16.0°C · Low 9.7°C · 59 mm rain
- Tartu in SeptemberEstonia · 223 kmHigh 15.4°C · Low 9.3°C · 50 mm rain
- Kaunas in SeptemberLithuania · 228 kmHigh 16.9°C · Low 9.9°C · 51 mm rain
- Klaipėda in SeptemberLithuania · 229 kmHigh 16.5°C · Low 11.7°C · 67 mm rain
- Vilnius in SeptemberLithuania · 261 kmHigh 16.7°C · Low 10.0°C · 54 mm rain
- Pskov in SeptemberRussia · 271 kmHigh 15.5°C · Low 9.5°C · 59 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Riga) is explained once on the Riga year overview and on the Sources, method and limits page.