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Rosetta weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Rosetta?
For a warm holiday, the best week has been 13–19 October (Weather Index 99). Favourable start dates for a 7-day trip run from 1 October to 9 November. July and August are warmest (33°C), June, July and August are driest and June and July have the most sun.
- Warmest
- July and August 33°C
- Coolest
- January 19°C
- Driest
- June, July and August 0% rain-day chance
- Wettest
- January 21% rain-day chance
- Sunniest
- June and July 14 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 Rosetta
Rosetta 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 | 18.8 | 11.0 | 21.0 | 6.5 | 24.5 | 9.5 |
| February | 19.7 | 11.3 | 15.0 | 4.2 | 15.7 | 9.8 |
| March | 22.4 | 13.2 | 8.4 | 2.6 | 11.7 | 11.1 |
| April | 25.9 | 15.5 | 2.7 | 0.8 | 2.4 | 11.8 |
| May | 29.3 | 18.9 | 0.3 | 0.1 | 0.9 | 13.0 |
| June | 31.4 | 22.3 | 0.0 | 0.0 | 0.1 | 13.8 |
| July | 32.7 | 24.6 | 0.0 | 0.0 | 0.1 | 13.5 |
| August | 33.0 | 24.9 | 0.0 | 0.0 | 0.0 | 12.3 |
| September | 32.0 | 23.8 | 0.3 | 0.1 | 0.2 | 11.8 |
| October | 29.2 | 20.6 | 5.8 | 1.8 | 7.8 | 10.7 |
| November | 25.6 | 16.9 | 8.3 | 2.5 | 9.7 | 9.8 |
| December | 21.2 | 13.4 | 16.1 | 5.0 | 19.9 | 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.