March scores 57/100 for outdoor ceremonies: low rain risk (5 wet days, 30mm), 11°C afternoons cooling to about 6°C for the reception, and 11.8 hours of daylight for the photography schedule. July is the month to avoid at 33/100.
March outdoor ceremony score: 57/100
Climate normals for Nagano rescored on wedding-specific weighting. Once your date falls inside the 14-day window the live forecast on this page takes over.
Conditions on this page are recalculated from the latest forecast every time it is opened, for the current date in the location's own time zone. Showing .
| Best wedding month | March — 57/100 |
| Second choice | February — 56/100 |
| Month to avoid | July — 33/100 |
| Rain risk in the best month | Low — rain on about 5 days |
| Guest comfort | 63/100 at 11°C |
| Reception temperature | ≈ 6°C after sunset in March |
| Photo light | 9h of sun across a 11.8h day |
| Months scoring 65+ | 0 of 12 |
March keeps seated guests at 11°C in the afternoon and around 6°C after sunset — the closest Nagano gets to a ceremony that needs neither shade structures nor patio heaters.
Rain falls on roughly 5 days in March (low risk, 30mm). A simple marquee-on-standby is usually enough.
March gives 11.8 hours of daylight and about 9 hours of direct sun per day, so a late-afternoon ceremony puts portraits inside golden hour rather than after it.
July scores 33/100 for weddings in Nagano: 30°C highs, 129mm 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 | 51/100 | Very low (3 days) | 5°C | 0°C | 42/100 | 73/100 |
| February | 56/100 | Very low (3 days) | 7°C | 2°C | 49/100 | 74/100 |
| March | 57/100 | Low (5 days) | 11°C | 6°C | 63/100 | 70/100 |
| April | 56/100 | Moderate (9 days) | 18°C | 13°C | 86/100 | 52/100 |
| May | 48/100 | Moderate (13 days) | 24°C | 19°C | 92/100 | 27/100 |
| June | 37/100 | High (15 days) | 28°C | 23°C | 72/100 | 21/100 |
| July | 33/100 | High (14 days) | 30°C | 25°C | 65/100 | 23/100 |
| August | 40/100 | Moderate (13 days) | 28°C | 23°C | 75/100 | 33/100 |
| September | 45/100 | High (15 days) | 24°C | 19°C | 92/100 | 9/100 |
| October | 47/100 | Moderate (11 days) | 18°C | 13°C | 86/100 | 34/100 |
| November | 49/100 | Low (7 days) | 11°C | 6°C | 63/100 | 53/100 |
| December | 55/100 | Very low (3 days) | 7°C | 2°C | 49/100 | 72/100 |
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 Nagano 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 Nagano linked below.
March, at 57/100. It combines low rain risk with 11°C afternoons and roughly 6°C evenings, which is the most forgiving combination Nagano offers for seated guests.
July scores 33/100: 30°C highs, 129mm of rain over about 14 days and 25°C evenings make a fully outdoor plan fragile.
In March rain falls on roughly 5 of 30 days, so the single-day probability is about 17%. In July that rises to about 47%.
A marquee on standby is usually enough in March, where rain risk is low. Outside the 0 months scoring 65 or higher, book real covered space.
March gives 11.8 hours of daylight and about 9 hours of direct sun. Put portraits in the final 60–90 minutes of daylight so they land inside golden hour rather than after it.