Portland Weather in May

May in Portland typically sees daytime highs of 15°C (59°F) and nighttime lows of 10°C (50°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Portland in May

This month experiences about 13 days of rain according to historical data, averaging 60 mm (2.4 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Portland in May

In May, expect moderate temperatures in Portland, with highs of 15°C (59°F) and lows of 10°C (50°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 10°C (50°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Portland in May

The days are predominantly sunny, with an estimated total of around 208 hours of sunshine. Despite the cool temperatures, these sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

If you prefer enjoying temperate temperatures and rain-free days, August typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.