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Napa County

Province · California, 🇺🇸 United States
Population 138,019
Area 2,043 km²
Time zone America/Los_Angeles
Official website www.countyofnapa.org
Napa County

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Napa County — Map

Napa County — Map

Climate & when to visit

Best time to visit: April, May, June, October

Select a month

Typical weather in January

Fair
  • 13° (feels like 10°) · extremes -1°–18°
  • 4° at night
  • 11 rainy days
  • 13 sunny days
  • 5 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 2 · low

Typical weather in February

Fair
  • 14° (feels like 11°) · extremes 0°–20°
  • 5° at night
  • 10 rainy days
  • 15 sunny days
  • 7 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 3 · moderate

Typical weather in March

Good
  • 16° (feels like 14°) · extremes 1°–23°
  • 6° at night
  • 10 rainy days
  • 17 sunny days
  • 8 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 5 · moderate

Typical weather in April

Great
  • 19° (feels like 17°) · extremes 2°–27°
  • 7° at night
  • 6 rainy days
  • 20 sunny days
  • 10 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 6 · high

Typical weather in May

Great
  • 24° (feels like 22°) · extremes 6°–32°
  • 10° at night
  • 3 rainy days
  • 24 sunny days
  • 12 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 8 · very high

Typical weather in June

Great
  • 29° (feels like 27°) · extremes 9°–37°
  • 12° at night
  • 1 rainy day
  • 27 sunny days
  • 13 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 9 · very high

Typical weather in July

Good
  • 33° (feels like 31°) · extremes 10°–40°
  • 14° at night
  • 0 rainy days
  • 30 sunny days
  • 13 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 10 · very high
Up to 8 days above 35°

Typical weather in August

Good
  • 33° (feels like 31°) · extremes 11°–39°
  • 15° at night
  • 0 rainy days
  • 28 sunny days
  • 12 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 8 · very high
Up to 9 days above 35°

Typical weather in September

Good
  • 31° (feels like 29°) · extremes 10°–38°
  • 14° at night
  • 1 rainy day
  • 26 sunny days
  • 11 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 7 · high
Up to 6 days above 35°

Typical weather in October

Great
  • 26° (feels like 23°) · extremes 7°–34°
  • 11° at night
  • 4 rainy days
  • 23 sunny days
  • 8 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 4 · moderate

Typical weather in November

Good
  • 18° (feels like 15°) · extremes 2°–26°
  • 7° at night
  • 8 rainy days
  • 17 sunny days
  • 6 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 3 · moderate

Typical weather in December

Fair
  • 13° (feels like 10°) · extremes -1°–18°
  • 4° at night
  • 12 rainy days
  • 12 sunny days
  • 5 hours of sunshine per day
  • Dry air
  • Calm winds
  • UV index 1 · low

Climate data: NASA POWER (MERRA-2) · 1996–2025

Practical information

Currency
US Dollar USD $ · Card payments · Widely accepted
Emergency numbers
911 Police · Ambulance · Fire brigade
Electricity
Type A / Type B
120 V · 60 Hz
Languages
English
Tap water
Safe to drink
Driving side
Right
Calling code
+1
Learn more

Tours & Activities

Robert Mondavi
Drive
Oxbow Public market
Drive
Castello di Amorosa

Napa County – Plan Your Days

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