Last updated: August 23, 2025
In Jonava, Lithuania, the average temperature in September hovers around 14°C (57°F). Expect a chilly minimum of -2°C (29°F) and a pleasant maximum of 28°C (82°F). During this month, you'll likely experience 67 mm (2.6 in) of precipitation over approximately 11 days, and the average humidity will be quite high at 83%. Stay prepared for the varied weather!
In September in Jonava, the average temperature is 14°C (57°F), with maximums reaching up to 28°C (82°F) and minimums dipping as low as -2°C (29°F). This diverse temperature range makes Jonava an interesting destination for travelers who enjoy experiencing varying weather conditions.
In Jonava in September, the total precipitation amount is 67 mm (2.6 in) over the course of 11 days.
In Jonava in September, humidity is 83%. With an average temperature of 14°C (57°F), this humidity feels like you're stepping into a warm, damp embrace that can make outdoor activities quite uncomfortable, often leaving you sweaty and exhausted if you're not prepared with plenty of water and breathable clothing.
In Jonava in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Jonava.
UV Risk Categories
Weather in Jonava varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Jonava, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (30°F) | 51 mm (2.0 inches) | 94% | low |
| February Weather | -1°C (30°F) | 38 mm (1.5 inches) | 92% | low |
| March Weather | 2°C (36°F) | 43 mm (1.7 inches) | 90% | moderate |
| April Weather | 7°C (45°F) | 43 mm (1.7 inches) | 86% | moderate |
| May Weather | 13°C (55°F) | 63 mm (2.5 inches) | 72% | high |
| June Weather | 18°C (65°F) | 57 mm (2.2 inches) | 74% | high |
| July Weather | 19°C (66°F) | 93 mm (3.7 inches) | 76% | high |
| August Weather | 18°C (65°F) | 85 mm (3.3 inches) | 74% | high |
| September Weather | 14°C (57°F) | 67 mm (2.6 inches) | 83% | moderate |
| October Weather | 9°C (48°F) | 66 mm (2.6 inches) | 91% | moderate |
| November Weather | 5°C (40°F) | 51 mm (2.0 inches) | 93% | low |
| December Weather | 0°C (32°F) | 56 mm (2.2 inches) | 95% | low |