When to go · San Juan
San Juan in December
Avoid month. Listed as a month to avoid: Dec–Feb (35–40 °C (95–104 °F) days), and the summer holiday weeks.Avoid month. Listed as a month to avoid: Dec–Feb (95–104 °F (35–40 °C) days), and the summer holiday weeks.
Key facts
- Verdict
- Avoid
- Temperature
- 34°C (93°F)93°F (34°C) / 18°C (64°F)64°F (18°C)
- average high / low
- Rain days
- 3
- Crowds
- High
- Argentina overall
- Prices
- High
- Argentina overall
Verdict
Listed as a month to avoid: Dec–Feb (35–40 °C (95–104 °F) days), and the summer holiday weeks.Listed as a month to avoid: Dec–Feb (95–104 °F (35–40 °C) days), and the summer holiday weeks.
Is another month better than December?
December is rated avoid. These months rate higher:
Weather in December
- San JuanHighs around 34 °C (93 °F), lows around 18 °C (64 °F), rain on about 3 daysHighs around 93 °F (34 °C), lows around 64 °F (18 °C), rain on about 3 days
- Cuyo (Mendoza and the high Andes), Argentina · Mendoza, San Juan, Aconcaguafine
Dry and sunny; harvest (vendimia) in March; the pass to Chile can close with snow in June–September.
Crowds and prices
- Crowds · Argentina overall
- High
- Prices · Argentina overall
- High
Argentina overall: Patagonia summer starts; book flights early; Christmas and New Year fill everything.
High-price month: see what to book ahead.
Compare two months
Weather, crowds and prices for any two months in San Juan, side by side.
Verdict
Dec: Avoid
Mar: Great (better)
Daytime high
Dec: 34 °C (93 °F)93 °F (34 °C)
Mar: 31 °C (88 °F)88 °F (31 °C)
Night low
Dec: 18 °C (64 °F)64 °F (18 °C)
Mar: 16 °C (61 °F)61 °F (16 °C)
Rain days
Dec: 3
Mar: 3
Crowds
Dec: High
Mar: Medium
Prices
Dec: High
Mar: Medium
Festivals listed
Dec: 0
Mar: 1
December: Listed as a month to avoid: Dec–Feb (35–40 °C days), and the summer holiday weeks.
March: Inside San Juan's best window: Mar–May, Sep–Nov.
San Juan: figures are long-term averages from this guide, not a forecast.
What to pack
- Light, breathable clothes, a sun hat and sunscreen