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When to go · San José

San José in September

Mixed month. Very wet; landslides on rural roads.

Key facts

Verdict
Mixed
Temperature
26°C (79°F) / 18°C (64°F)
average high / low
Rain days
23
Crowds
Low
Costa Rica overall
Prices
Low
Costa Rica overall

Verdict

MixedVoykit month rating for San José

Very wet; landslides on rural roads.

All twelve months in one grid — weather, crowds and prices, with gaps left as unknown.

Is another month better than September?

September is rated mixed. These months rate higher:

Weather in September

Long-term averages
  • San JoséHighs around 26 °C (79 °F), lows around 18 °C (64 °F), rain on about 23 days
  • Central Valley and mountains, Costa Rica · San José, Monteverde, Poás, Irazúrainy

    Spring-like 18–26 °C (64–79 °F); Monteverde is cool, windy and misty — pack a fleece.

Peak wet season season

Lowest prices and quiet museums.

Watch: September and October are the wettest; landslides close some rural roads.

Festivals and holidays

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

  • Independence Day and lantern parade

    14–15 September · Nationwide, downtown parades

    Museums closed on the day; parades block downtown streets.

Crowds and prices

Crowds · Costa Rica overall
Low
Prices · Costa Rica overall
Low

Costa Rica overall: Wettest on the Pacific; driest on the Caribbean — switch sides.

Compare two months

Weather, crowds and prices for any two months in San José, side by side.

  • Verdict

    Sep: Mixed

    Jan: Great (better)

  • Daytime high

    Sep: 26 °C (79 °F)

    Jan: 26 °C (79 °F)

  • Night low

    Sep: 18 °C (64 °F)

    Jan: 16 °C (61 °F)

  • Rain days

    Sep: 23

    Jan: 3 (better)

  • Crowds

    Sep: Low

    Jan: High

  • Prices

    Sep: Low

    Jan: High

  • Festivals listed

    Sep: 1

    Jan: 2

September: Very wet; landslides on rural roads.

January: Dry and sunny; mornings cool.

San José: figures are long-term averages from this guide, not a forecast.

What to pack

  • A rain jacket or umbrella and shoes that dry fast

Build the full packing list for your trip →

Across Costa Rica in September →