The best time to visit Monaco would be the months of April through May and September through October. Summer normally lasts from June through August, and can get hot, with an average of 21°C (70°F) heat up to 26°C (79°F) during July and August. At this time, you will be bumping elbows with most of Europe. Winter is the best bet, it can be a bit drizzly but it is doubtful that it will be too cold. From December through to January, daytime temperatures subside to a range of 8-12°C (46-54°F).
CLIMATE
Weather Averages for Monte Carlo:
Average High/Low Temperature for Monte Carlo, Monaco
| Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| 54°f | 55°f | 57°f | 61°f | 66°f | 73°f | 79°f | 79°f | 75°f | 68°f | 61°f | 57°f |
| 12°c | 13°c | 14°c | 16°c | 19°c | 23°c | 26°c | 26°c | 24°c | 20°c | 16°c | 14°c |
| 46°f | 46°f | 50°f | 54°f | 59°f | 66°f | 72°f | 72°f | 68°f | 61°f | 54°f | 50°f |
| 8°c | 8°c | 10°c | 12°c | 15°c | 19°c | 22°c | 22°c | 20°c | 16°c | 12°c | 10°c |
Average Rainfall for Monte Carlo, Monaco
| Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| 61mm | 58mm | 71mm | 65mm | 64mm | 33mm | 21mm | 22mm | 66mm | 113mm | 123mm | 99mm |
| 5 Days | 5 Days | 7 Days | 5 Days | 5 Days | 4 Days | 1 Days | 2 Days | 4 Days | 7 Days | 7 Days | 6 Days |
Average Humidity for Monte Carlo, Monaco
| Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| 67% | 69.50% | 73.50% | 74.50% | 76.50% | 77% | 74.50% | 74% | 74% | 72% | 72% | 71.50% |
Average Daily Sunshine Hours for Monte Carlo, Monaco
| Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| 5 Hrs | 5 Hrs | 5 Hrs | 6 Hrs | 7 Hrs | 8 Hrs | 9 Hrs | 9 Hrs | 7 Hrs | 6 Hrs | 5 Hrs | 4 Hrs |
HOLIDAYS
January - New Year's Day
January - Sainte-Dévote, patron saint of the Principality
March - Good Friday
March - Easter
March - Easter Monday
May - Labour Day
May - Ascension (Govt. employees only)
May - Whit Sunday (Pentecost)
May - Whit Monday
May - Corpus Christi
August - Assumption of the Blessed Virgin (Government employees only)
November - All Saints Day
November - National Day
December - Immaculate Conception
December - Christmas Eve (Half day for government employees)
December - Christmas Day
December - New Year's Eve (St Sylvester, half day)
Weekend: Saturday, Sunday
