Wetter in Pärnu im September

Regulars are consistent this month is genuinely hard to predict even by Baltic standards, capable of pleasant, mild stretches especially early on or a run of chill wind and heavy rain with little warning either way. Our row backs that cool, genuinely wet read, 17.1C over 9.5C nights feeling 7C, with 69.6mm of rain across 9.9 days and humidity at 81 percent. Regulars are specific that snow is not a realistic concern this early, the real planning issue is rain and wind rather than cold, and that packing both rain gear and some lighter layers covers most of what the month can bring. Regulars are consistent the Old Town stays genuinely worth walking regardless, umbrella in hand. The sea sits at a cool 17.7C. The record: 8.3 hours of sun, a 21.6 kph wind and AQI 41.

Estonia's forum is realistic about December: subzero temperatures are common but not constant, this is the darkest stretch of the year, and rain is honestly just as likely as snow - a lot of December here means slush rather than a clean white blanket. Wind varies a lot day to day, from calm to blustery, so there's no single pattern to plan around. Pärnu's own beach town character goes fully dormant this time of year, but the coastal chill and short daylight hours are consistent with what the wider Baltic region sees this month.

Forum posters describe June across Estonia as genuinely hit or miss, even around midsummer - a lucky visitor gets blue skies and T-shirt weather, an unlucky one gets sleet, with July generally the more reliably warm month. Posters are consistent that any June rain tends to come as passing showers rather than prolonged, driving rain. Posters specifically flag a real upside for Parnu: the sea here runs 5-7C warmer than in Tallinn through June-August, a meaningful difference for anyone hoping for a swim. Posters generally recommend Parnu as a good base for exploring western Estonia if the weather turns inclement and a car isn't available, given its concentration of things to do compared to more spread-out surrounding areas.