Rockland
Maine, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and Climate
Rockland, ME

A US flag flying outside a lighthouse on the water in Rockland, Maine
A US flag flying outside a lighthouse on the water in Rockland, Maine
  • The average high temperature in May: 16.7°C

Warmest months (with the highest average high temperature) are July and August (24.4°C).
The month with the lowest average high temperature is January (-1.1°C).

  • The average low temperature in May: 6.1°C

The month with the highest average low temperature is July (15°C).
The coldest month (with the lowest average low temperature) is January (-12.2°C).

  • The average rainfall in May: 105.2mm

The wettest month (with the highest rainfall) is November (145mm).
The driest month (with the lowest rainfall) is August (83.3mm).

  • The average rainfall days in May: 12 days

The month with the highest number of rainy days is December (13 days).
The month with the lowest number of rainy days is September (9 days).

  • The average sea temperature in May: 8°C

The best month for swimming (with the highest average sea temperature) is August (15°C).
The coldest month (with the lowest average sea temperature) is March (4°C).

  • The average daylight in May: 15h

Months with the longest days are May, June and July (Average daylight: 15h).
Months with shortest days are January and December (Average daylight: 9h).

  • The average sunshine in May: 7h

Months with most sunshine are June, July and August (Average sunshine: 8h).
Months with least sunshine are January, November and December (Average sunshine: 4).

  • The average UV index in May: 6

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).

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