Portland Weather in May

With daytime temperatures of 17°C (63°F) and nighttime lows of 12°C (54°F), May in Portland brings moderate temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 78 mm (3.1 in) falls on average.

Rainfall in Portland in May

You can expect rain on around 10 days based on historical patterns, with 78 mm (3.1 in) average for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Portland in May

May in Portland brings moderate temperatures, with highs of 17°C (63°F) and nights around 12°C (54°F). The difference between afternoon and evening temperatures is usually noticeable. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

If you prefer dry days with pleasant temperatures, January, February and March typically offer 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.