Skip to main content
SunnyDays

California · STS

Napa weather this week

Napa, California

Napa scores 8.1 out of 10 and has exactly one genuinely clear day in the next 7. Dull days (6) still outnumber bright ones (1), so this is not a good week.

8.1/10
Mostly dull
<built-in method clear of dict object at 0x7ce262a2da40> genuinely clear days, 0 partly cloudy, 6 overcast, 0 wet, 0 stormy — out of 7 forecast days.
Bright days 1 vs dull days 6. Dull wins, so we do not call this a good week.
We are not showing a flattering tier word here. Why the score and the sky can disagree.

The model gives this week 8.1 out of 10 because it is warm and largely rain-free, and those are the two things the score measures. It is not measuring sunshine. With 1 genuinely clear day and 6 dull ones, expect grey skies. We are showing you the number and the contradiction rather than only the number.

1 clear of 7 days · best run 7 days — The clouds are winning — 1 clear day out of 7

The next 7 days in Napa

Every number below is the forecast we hold, rendered as text — nothing here is drawn on a canvas or filled in by JavaScript. The rain figure is the highest chance across all 7 days (6%), not the lowest, because the worst number is the useful one.

Booking window Sat 8 Aug–Mon 10 Aug: 7.6/10 for those days alone. The 7-day outlook score (8.1) covers the full table below and includes days outside that window.

Napa daily forecast, Sat 8 Aug to Fri 14 Aug (7 days total). Best single day scores 10.0; worst scores 7.0. A lone good day cannot carry the week.
Day High Low Rain chance Sky Day score
81°F 56°F 2% Fog cloudy 7.0
Cloudy but warm & dry
89°F 55°F 1% Fog cloudy 7.0
Cloudy but warm & dry
78°F 56°F 2% Fog cloudy 7.0
Cloudy but warm & dry
82°F 54°F 0% Clear clear 10.0
Clear and perfect
77°F 55°F 0% Overcast cloudy 8.5
Cloudy but warm & dry
78°F 56°F 2% Overcast cloudy 8.5
Cloudy but warm & dry
81°F 55°F 6% Overcast cloudy 8.5
Cloudy but warm & dry

How this week got its score

  • 7 forecast days: 1 clear/mainly clear, 0 partly cloudy, 6 overcast, 0 wet (fog/drizzle/rain/showers), 0 stormy.
  • Trimmed mean of day scores 7.9 × 0.55 = 4.35
  • Worst day drag: worst day is 7.0 × 0.25 = 1.75 - one bad day cannot be averaged away.
  • Longest consecutive run of good days (≥7.0) is 7/7 = 100% coverage × 0.20 = 2.00
  • Best single day is 10.0 but it only counts through the trimmed mean - a lone great day cannot carry the window.
  • Advertised 3-day window (2026-08-08→2026-08-10) scores 7.6 on its own.
  • Legacy gate counted 7/7 days as "perfect sun"; this model counts 1 genuinely clear.

The full model, including why a single great day cannot rescue a bad week, is on the methodology page.

Getting to Napa

The nearest airport we price is STS. From New York City that is about 5h 36m in the air out of SWF, 2552 miles. Then about 38m to drive from CCR (est. 25 mi — road model, not real routing). Total door-to-lounger: 6h 14m. Flight times from 55 other departure metros are on the search page.

Where to stay in Napa

3 properties we currently hold live rates for, in supplier order. The nightly rate shown is what the supplier returned at the last refresh for the window above — it is a held rate, not a quote, and it moves.

So, should you go?

Napa scores 8.1 out of 10 and has exactly one genuinely clear day in the next 7. Dull days (6) still outnumber bright ones (1), so this is not a good week. There is some sun in this window, but not much. Compare it against the rest of the list before booking.

Napa by month — 8-year ERA5 history

Historical clear-sky percentages from the ERA5 reanalysis (2018–2025). This is history, not a forecast — the 7-day forecast above is this week. They can and do differ.

Napa: clear-sky % by month, ERA5 2018–2025. n = days sampled.
Month Historically clear Sample (n)
January 1% n=248 all destinations →
February 10% n=226 all destinations →
March 9% n=248 all destinations →
April 42% n=240 all destinations →
May 70% n=248 all destinations →
June 94% n=240 all destinations →
July 98% n=248 all destinations →
August 96% n=248 all destinations →
September 86% n=240 all destinations →
October 73% n=248 all destinations →
November 18% n=240 all destinations →
December 0% n=248 all destinations →

Each month links to the detailed almanac page for Napa in that month. The “all destinations” column links to the full ranking across all destinations for that month.

Forecast data from Open-Meteo, last refreshed 2026-08-09T05:01:05.311896Z. Hotel names and rates come from LiteAPI and change constantly; the rate shown is the rate we held at refresh time, not a quote. Scores are forecasts, not guarantees, and the whole model is published on our methodology page.