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Serang weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Serang?
For a warm holiday, the best week has been 29 July – 4 August (Weather Index 85). Favourable start dates for a 7-day trip run from 21 July to 5 August. April, May, October and November are warmest (31°C), August is driest and July to October have the most sun.
- Warmest
- April, May, October and November 31°C
- Coolest
- June to September and December to March 30°C
- Driest
- August 45% rain-day chance
- Wettest
- February 94% rain-day chance
- Sunniest
- July to October 11 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Serang
Serang historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 29.8 | 25.7 | 86.8 | 26.9 | 253.0 | 8.9 |
| February | 29.7 | 25.6 | 93.9 | 26.3 | 252.4 | 9.0 |
| March | 30.3 | 25.9 | 91.6 | 28.4 | 232.4 | 9.9 |
| April | 30.8 | 26.0 | 85.7 | 25.7 | 207.0 | 10.3 |
| May | 31.0 | 26.3 | 68.4 | 21.2 | 147.8 | 10.3 |
| June | 30.4 | 25.6 | 66.7 | 20.0 | 116.8 | 10.4 |
| July | 30.1 | 25.1 | 47.1 | 14.6 | 76.4 | 11.0 |
| August | 30.1 | 25.1 | 44.5 | 13.8 | 67.6 | 11.4 |
| September | 30.5 | 25.4 | 53.3 | 16.0 | 89.1 | 11.2 |
| October | 30.9 | 25.9 | 66.1 | 20.5 | 136.3 | 10.6 |
| November | 30.6 | 25.9 | 81.0 | 24.3 | 189.8 | 9.5 |
| December | 30.1 | 25.8 | 80.0 | 24.8 | 228.3 | 9.1 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.