With daytime temperatures of 24°C (75°F) and nighttime lows of 17°C (63°F), September in Neptun brings high temperatures during the day. The excellent weather makes it an appealing time to visit.
So this is a great month to visit if you prefer dry days with pleasant temperatures.
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Pick a month to see the average temperature, rainfall and sunshine in Neptun - and find the best time to visit.
49-year average (1976-2025)
Based on our historical records, temperatures in Neptun typically drop from around 25°C (77°F) at the start of September to approximately 21°C (70°F) by the end. Nights are cool, with lows typically ranging from 12°C (54°F) to 16°C (61°F).
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Neptun spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Based on weather observations in Neptun between 1997 and 2026, these are the recorded extremes during September.
Find out more about the weather in Romania and which places have the best travel conditions in this month. See all of Romania in September →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
For Neptun in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity
See the full Neptun climate overview or explore weather in Romania.
Where to go in September - average daytime high across popular destinations.
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