WEATHER · CLIMATE NORMALS · 1991–2020
Riga Climate — Averages by Month
What the weather in Riga, LVaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | -2.1 °C | 56.5 mm |
| February | -2.3 °C · coldest | 46.3 mm |
| March | 0.6 °C | 44.8 mm |
| April | 6.0 °C | 46.1 mm |
| May | 11.4 °C | 55.4 mm |
| June | 15.6 °C | 78.0 mm |
| July | 18.5 °C · warmest | 76.4 mm |
| August | 17.9 °C | 85.7 mm |
| September | 13.4 °C | 76.4 mm |
| October | 7.9 °C | 88.1 mm · wettest |
| November | 3.2 °C | 68.8 mm |
| December | -0.1 °C | 58.7 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Riga — centred at 57.00°N, 24.00°E. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.