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Sumbawanga weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Sumbawanga?
For a warm holiday, the best week has been 17–23 September (Weather Index 98). Favourable start dates for a 7-day trip run from 1 September to 6 October. September and October are warmest (26°C), June is driest and August and September have the most sun.
- Warmest
- September and October 26°C
- Coolest
- January 22°C
- Driest
- June 0% rain-day chance
- Wettest
- January 95% rain-day chance
- Sunniest
- August and September 12 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 Sumbawanga
Sumbawanga 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 | 22.4 | 15.2 | 94.5 | 29.3 | 314.7 | 8.0 |
| February | 23.4 | 15.2 | 86.1 | 24.1 | 241.9 | 8.8 |
| March | 23.5 | 15.3 | 85.5 | 26.5 | 294.8 | 9.2 |
| April | 23.2 | 15.2 | 69.3 | 20.8 | 195.3 | 10.2 |
| May | 23.5 | 13.3 | 18.4 | 5.7 | 36.1 | 11.4 |
| June | 23.6 | 11.1 | 0.0 | 0.0 | 1.0 | 11.5 |
| July | 23.5 | 10.5 | 0.6 | 0.2 | 0.8 | 11.5 |
| August | 24.7 | 12.4 | 1.0 | 0.3 | 1.5 | 11.7 |
| September | 26.0 | 14.6 | 3.7 | 1.1 | 4.4 | 11.7 |
| October | 26.2 | 16.3 | 20.6 | 6.4 | 47.5 | 11.5 |
| November | 24.8 | 16.3 | 56.7 | 17.0 | 185.9 | 10.3 |
| December | 23.0 | 15.4 | 86.1 | 26.7 | 323.1 | 8.9 |
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.