December scores 63/100 for outdoor ceremonies: low rain risk (4 wet days, 51mm), 13°C afternoons cooling to about 8°C for the reception, and 9.6 hours of daylight for the photography schedule. August is the month to avoid at 35/100.
December outdoor ceremony score: 63/100
Climate normals for Yokohama 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 | December — 63/100 |
| Second choice | May — 59/100 |
| Month to avoid | August — 35/100 |
| Rain risk in the best month | Low — rain on about 4 days |
| Guest comfort | 69/100 at 13°C |
| Reception temperature | ≈ 8°C after sunset in December |
| Photo light | 8h of sun across a 9.6h day |
| Months scoring 65+ | 0 of 12 |
December keeps seated guests at 13°C in the afternoon and around 8°C after sunset — the closest Yokohama gets to a ceremony that needs neither shade structures nor patio heaters.
Rain falls on roughly 4 days in December (low risk, 51mm). A simple marquee-on-standby is usually enough.
December gives 9.6 hours of daylight and about 8 hours of direct sun per day, so a late-afternoon ceremony puts portraits inside golden hour rather than after it.
August scores 35/100 for weddings in Yokohama: 30°C highs, 168mm of rain and 25°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 | 54/100 | Low (4 days) | 10°C | 5°C | 59/100 | 42/100 |
| February | 57/100 | Low (4 days) | 10°C | 5°C | 59/100 | 64/100 |
| March | 49/100 | Moderate (8 days) | 13°C | 8°C | 69/100 | 53/100 |
| April | 52/100 | Moderate (9 days) | 17°C | 12°C | 83/100 | 38/100 |
| May | 59/100 | Moderate (10 days) | 23°C | 18°C | 96/100 | 37/100 |
| June | 44/100 | Moderate (12 days) | 27°C | 22°C | 79/100 | 38/100 |
| July | 38/100 | Moderate (11 days) | 30°C | 25°C | 66/100 | 26/100 |
| August | 35/100 | Moderate (12 days) | 30°C | 25°C | 66/100 | 22/100 |
| September | 40/100 | High (15 days) | 27°C | 22°C | 79/100 | 23/100 |
| October | 46/100 | High (14 days) | 23°C | 18°C | 96/100 | 3/100 |
| November | 59/100 | Low (7 days) | 17°C | 12°C | 83/100 | 39/100 |
| December | 63/100 | Low (4 days) | 13°C | 8°C | 69/100 | 62/100 |
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 Yokohama 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 Yokohama linked below.
December, at 63/100. It combines low rain risk with 13°C afternoons and roughly 8°C evenings, which is the most forgiving combination Yokohama offers for seated guests.
August scores 35/100: 30°C highs, 168mm of rain over about 12 days and 25°C evenings make a fully outdoor plan fragile.
In December rain falls on roughly 4 of 30 days, so the single-day probability is about 13%. In August that rises to about 40%.
A marquee on standby is usually enough in December, where rain risk is low. Outside the 0 months scoring 65 or higher, book real covered space.
December gives 9.6 hours of daylight and about 8 hours of direct sun. Put portraits in the final 60–90 minutes of daylight so they land inside golden hour rather than after it.