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When to go · Blue Lagoon

Blue Lagoon in September

Good month. Outside the best window (All year – water stays warm; summer offers longer daylight.). Across Iceland: Autumn colours, aurora season begins, highlands close; great shoulder month.

Key facts

Verdict
Good
Temperature
11°C (52°F) / 6°C (43°F)
average high / low
Rain days
10
Crowds
Medium
Iceland overall
Prices
Medium
Iceland overall

Verdict

GoodIceland month rating

Outside the best window (All year – water stays warm; summer offers longer daylight.). Across Iceland: Autumn colours, aurora season begins, highlands close; great shoulder month.

Is another month better than September?

No other month rates higher than September for Blue Lagoon in this guide.

Weather in September

Long-term averages
  • Blue LagoonHighs around 11 °C (52 °F), lows around 6 °C (43 °F), rain on about 10 days

Crowds and prices

Crowds · Iceland overall
Medium
Prices · Iceland overall
Medium

Iceland overall: Autumn colours, aurora season begins, highlands close; great shoulder month.

Compare two months

Weather, crowds and prices for any two months in Blue Lagoon, side by side.

  • Verdict

    Sep: Good

    Mar: Good

  • Daytime high

    Sep: 11 °C (52 °F)

    Mar: 4 °C (39 °F)

  • Night low

    Sep: 6 °C (43 °F)

    Mar: -2 °C (28 °F)

  • Rain days

    Sep: 10 (better)

    Mar: 12

  • Crowds

    Sep: Medium

    Mar: Medium

  • Prices

    Sep: Medium

    Mar: Medium

  • Festivals listed

    Sep: 0

    Mar: 0

September: Outside the best window (All year – water stays warm; summer offers longer daylight.). Across Iceland: Autumn colours, aurora season begins, highlands close; great shoulder month.

March: Outside the best window (All year – water stays warm; summer offers longer daylight.). Across Iceland: Balance of light and dark: auroras plus 11–13 h of day; Easter in late March 2027.

Blue Lagoon: figures are long-term averages from this guide, not a forecast.

What to pack

  • A warm layer for the evenings
  • A rain jacket or umbrella and shoes that dry fast

Build the full packing list for your trip →

Across Iceland in September →