Weather Comparison
Side-by-side weather comparison for September
| Metric | Bali | Istanbul | Better |
|---|---|---|---|
| Average HighHigher is warmer | 27°C (81°F)▲ | 22°C (72°F) | Bali |
| Average LowHigher is milder | 23°C (73°F)▲ | 13°C (55°F) | Bali |
| Rain DaysFewer is drier | 11 days | 4 days▲ | Istanbul |
| PrecipitationLess is drier | 53 mm | 45 mm▲ | Istanbul |
| Sunshine HoursMore is sunnier | 12h/day▲ | 4h/day | Bali |
| HumidityLower is more comfortable | 82% | 65%▲ | Istanbul |
| UV IndexLower is safer | 6 | 6 | Tie |
| Wind SpeedCalmer is better | 16 km/h | 15 km/h▲ | Istanbul |
Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Istanbul edges ahead as the better destination in September. Istanbul offers 4 hours of daily sunshine with only 4 rain days, while Bali sees 12 sunshine hours and 11 rain days.
Bali sits in the comfortable travel range at 27°C. Istanbul is also comfortable at 22°C.
For travelers who prioritize dry weather, Istanbul is the stronger choice in September. Bali receives 8 more hours of sunshine per day, which matters for sightseeing and outdoor activities.
Bali reaches an average high of 27°C (81°F) and drops to 23°C (73°F) at night during September. The daily temperature range is 4°C, meaning relatively stable temperatures from day to night.
Istanbul averages 22°C (72°F) for the high and 13°C (55°F) for the low, with a daily range of 9°C. There is a notable 5°C gap between the two cities, so expect a very different feel.
Bali is in the Southern Hemisphere while Istanbul is in the Northern Hemisphere. This means they experience opposite seasons, which explains any large temperature difference.
Bali receives approximately 53 mm of rainfall across 11 rain days during September. You can expect rain roughly every other day.
Istanbul sees 45 mm over 4 rain days. That makes Istanbul the drier option by 7 rain days and 8 mm of total precipitation.
Humidity also differs: Bali averages 82% while Istanbul sits at 65%. Bali will feel muggier, especially at higher temperatures.
Highs of 27°C, lows of 23°C, 11 rain days
Highs of 22°C, lows of 13°C, 4 rain days
Pack for both: light layers, a light jacket for evenings, sunscreen. These items are useful in either destination during September.
The table below shows average high temperatures and rain days for every month. September is highlighted for quick reference.
| Month | Bali | Istanbul | ||
|---|---|---|---|---|
| High | Rain | High | Rain | |
| Jan | 28°C | 29d | 16°C | 6d |
| Feb | 28°C | 27d | 19°C | 5d |
| Mar | 28°C | 28d | 22°C | 4d |
| Apr | 28°C | 24d | 26°C | 2d |
| May | 28°C | 18d | 28°C | 1d |
| Jun | 27°C | 14d | 29°C | 1d |
| Jul | 26°C | 12d | 28°C | 1d |
| Aug | 26°C | 10d | 26°C | 2d |
| Sep | 27°C | 11d | 22°C | 4d |
| Oct | 28°C | 17d | 19°C | 5d |
| Nov | 28°C | 23d | 16°C | 6d |
| Dec | 28°C | 28d | 15°C | 7d |
Bali Weather in September
Full forecast, packing tips, and activities
Istanbul Weather in September
Full forecast, packing tips, and activities