July scores 63/100 for outdoor ceremonies: moderate rain risk (8 wet days, 78mm), 23°C afternoons cooling to about 16°C for the reception, and 15.2 hours of daylight for the photography schedule. December is the month to avoid at 20/100.
July outdoor ceremony score: 63/100
Climate normals for Chamonix rescored on wedding-specific weighting. Once your date falls inside the 14-day window the live forecast on this page takes over.
Last updated: · Live forecast data refreshes hourly.
| Best wedding month | July — 63/100 |
| Second choice | August — 62/100 |
| Month to avoid | December — 20/100 |
| Rain risk in the best month | Moderate — rain on about 8 days |
| Guest comfort | 96/100 at 23°C |
| Reception temperature | ≈ 16°C after sunset in July |
| Photo light | 5h of sun across a 15.2h day |
| Months scoring 65+ | 0 of 12 |
July keeps seated guests at 23°C in the afternoon and around 16°C after sunset — the closest Chamonix gets to a ceremony that needs neither shade structures nor patio heaters.
Rain falls on roughly 8 days in July (moderate risk, 78mm). Book a covered backup you would genuinely be happy to use.
July gives 15.2 hours of daylight and about 5 hours of direct sun per day, so a late-afternoon ceremony puts portraits inside golden hour rather than after it.
December scores 20/100 for weddings in Chamonix: 5°C highs, 88mm of rain and 0°C evenings make a fully outdoor plan fragile.
Scored on rain risk, guest comfort, evening temperature and photographic light — deliberately different weighting from the travel score.
| Month | Wedding score | Rain risk | Afternoon | Evening | Guest comfort | Photo light |
|---|---|---|---|---|---|---|
| January | 23/100 | Moderate (9 days) | 2°C | -3°C | 32/100 | 23/100 |
| February | 30/100 | Low (7 days) | 2°C | -3°C | 32/100 | 32/100 |
| March | 30/100 | Moderate (8 days) | 5°C | 0°C | 42/100 | 31/100 |
| April | 40/100 | Moderate (8 days) | 10°C | 4°C | 59/100 | 42/100 |
| May | 40/100 | Moderate (11 days) | 15°C | 9°C | 76/100 | 35/100 |
| June | 49/100 | Moderate (11 days) | 20°C | 14°C | 93/100 | 29/100 |
| July | 63/100 | Moderate (8 days) | 23°C | 16°C | 96/100 | 38/100 |
| August | 62/100 | Moderate (10 days) | 23°C | 16°C | 96/100 | 72/100 |
| September | 62/100 | Moderate (9 days) | 20°C | 14°C | 93/100 | 72/100 |
| October | 46/100 | Moderate (9 days) | 15°C | 9°C | 76/100 | 33/100 |
| November | 30/100 | Moderate (10 days) | 10°C | 4°C | 59/100 | 13/100 |
| December | 20/100 | Moderate (10 days) | 5°C | 0°C | 42/100 | 5/100 |
Wedding weather is scored differently from travel weather: seated guests in formalwear tolerate a narrower band than sightseers, and the ceremony hour matters more than the daily average. Each month in Chamonix is scored 0–100 on the weighting below.
| Factor | Weight | What it measures |
|---|---|---|
| Dry conditions | 38% | Share of days with measurable rain — the single factor most likely to force a backup plan. |
| Guest comfort | 27% | Distance from a 22°C daytime ideal, with an extra penalty for humid heat above 24°C. |
| Evening temperature | 20% | Modelled reception-hour temperature against an 18°C ideal for an outdoor evening. |
| Photo light | 15% | Sunshine hours and daylight length, which set the length and quality of the golden hour window. |
Based on long-run climate averages rather than a forecast. Plan the ceremony around the golden hour — see golden hour times for Chamonix linked below.
July, at 63/100. It combines moderate rain risk with 23°C afternoons and roughly 16°C evenings, which is the most forgiving combination Chamonix offers for seated guests.
December scores 20/100: 5°C highs, 88mm of rain over about 10 days and 0°C evenings make a fully outdoor plan fragile.
In July rain falls on roughly 8 of 30 days, so the single-day probability is about 27%. In December that rises to about 33%.
Yes. Even in the best month, rain risk in Chamonix is moderate, so book covered space you would genuinely be happy to use rather than treating it as a late add-on.
July gives 15.2 hours of daylight and about 5 hours of direct sun. Put portraits in the final 60–90 minutes of daylight so they land inside golden hour rather than after it.