Wedding weather data · USA
Wedding weather in Napa Valley
In Napa Valley, the driest months for a wedding are June, July, and August, when rain falls on about 1% of days. The wettest is December, with rain on about 33% of days. Here is the full picture, month by month, from 10 years of daily weather records.
Rain odds and temperatures by month
| Month | Chance of a rainy day | Heavy rain | Rainy days | Avg high | Avg low | Sunshine |
|---|---|---|---|---|---|---|
| January | 32% | 17% | 10 | 58°F (15°C) | 42°F (6°C) | 6.5 h/day |
| February | 24% | 13% | 6.7 | 62°F (17°C) | 42°F (6°C) | 8.6 h/day |
| March | 32% | 13% | 10 | 64°F (18°C) | 44°F (7°C) | 9 h/day |
| April | 14% | 4% | 4.3 | 70°F (21°C) | 47°F (8°C) | 11.2 h/day |
| May | 9% | 2% | 2.7 | 75°F (24°C) | 51°F (11°C) | 12.6 h/day |
| June ✦ | 2% | 0% | 0.7 | 84°F (29°C) | 55°F (13°C) | 13.4 h/day |
| July | 1% | 0% | 0.3 | 87°F (30°C) | 57°F (14°C) | 13.4 h/day |
| August | 1% | 0% | 0.2 | 86°F (30°C) | 58°F (14°C) | 12.5 h/day |
| September | 3% | 0% | 0.8 | 85°F (29°C) | 57°F (14°C) | 11.4 h/day |
| October | 10% | 3% | 3.1 | 78°F (26°C) | 53°F (12°C) | 9.8 h/day |
| November | 22% | 8% | 6.6 | 65°F (18°C) | 45°F (7°C) | 8.2 h/day |
| December | 33% | 15% | 10.2 | 58°F (14°C) | 41°F (5°C) | 6.4 h/day |
Source: Open-Meteo Historical Weather API (ERA5 reanalysis), daily data 2015–2024 for 38.30, -122.29. Rainy day ≥ 1 mm, heavy rain ≥ 10 mm. Climatology, not a forecast.
Best months for a wedding in Napa Valley
Weighing low rain odds with comfortable temperatures (roughly 18–29 °C / 65–84 °F highs), the best months for an outdoor wedding in Napa Valley are June.
When to be careful
December is the wettest month in Napa Valley: rain falls on about 33% of days, and 15% of days bring heavy rain (10 mm or more). Book a solid backup if you marry then.
How to read these numbers
A "rainy day" is a day with at least 1 mm (0.04 in) of rain. A 30% chance means about 3 in 10 days in that month saw at least a little rain, often a short shower. For your exact date and venue, use our free rain odds tool.
Frequently asked questions
What is the best month to get married in Napa Valley?
Based on 10 years of weather data, July is the driest month in Napa Valley, with rain on about 1% of days and average highs around 87°F (30°C). Overall, the best months for an outdoor wedding there are June.
What is the rainiest month in Napa Valley?
December is the rainiest month in Napa Valley: on average 10.2 days of the month see at least 1 mm of rain, and about 15% of days bring heavy rain.
Will it rain on my wedding day in Napa Valley?
Nobody can forecast your wedding day months ahead. What history shows is the chance of rain: in June it rains on about 2% of days in Napa Valley. Check your exact date with our free rain odds tool, then watch the real forecast from about 7 days out.