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SunnyDays

California · STS

Napa weather this week

Napa, California

Napa scores 8.6 out of 10 and has 2 genuinely clear days out of 7.

8.6/10
Partly clear
<built-in method clear of dict object at 0x7c5533feac80> genuinely clear days, 2 partly cloudy, 1 overcast, 2 wet, 0 stormy — out of 7 forecast days.
Bright days 4 vs dull days 3. Bright wins.
Our model tiers this window Excellent, and the clear-day count supports that.

2 clear of 7 days · best run 7 days — Sunshine, day after day — 7 of 7 straight

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 in the window (2%), not the lowest, because the worst number is the useful one.

Napa daily forecast, Thu 6 Aug to Sat 8 Aug. 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
80°F 57°F 1% Fog wet 7.0
Fog - expect to get wet
83°F 55°F 2% Fog wet 7.0
Fog - expect to get wet
87°F 55°F 2% Partly cloudy partly 9.3
Partly cloudy and dry
86°F 56°F 0% Clear clear 10.0
Clear and perfect
79°F 56°F 0% Overcast cloudy 8.5
Cloudy but warm & dry
81°F 54°F 0% Clear clear 10.0
Clear and perfect
82°F 55°F 0% Partly cloudy partly 9.3
Partly cloudy and dry

How this week got its score

  • 7 forecast days: 2 clear/mainly clear, 2 partly cloudy, 1 overcast, 2 wet (fog/drizzle/rain/showers), 0 stormy.
  • Trimmed mean of day scores 8.8 × 0.55 = 4.85
  • 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 (2026-08-06→2026-08-08) scores 8.0 on its own.
  • Legacy gate counted 7/7 days as "perfect sun"; this model counts 2 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. 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.

  • Stanly Ranch, Auberge Collection
    5-star · guest rating 9.5/10 · Auberge Resorts
    $1,741per night$5,222 total
  • Archer Hotel Napa
    4-star · guest rating 9.3/10
    $502per night$1,506 total
  • Napa River Inn
    4-star · guest rating 8.9/10
    $377per night$1,130 total

So, should you go?

Napa scores 8.6 out of 10 and has 2 genuinely clear days out of 7. That holds up. Check the daily rows above for which specific days carry the sun, and price it from your own airport.

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 2026-08-06T13:36:08.059221Z. 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.