Ottawa Weather in May

During May, Ottawa experiences high daytime temperatures of 24°C (75°F) and cooler nights around 12°C (54°F). As the wettest month of the year, expect frequent rainfall.

Rainfall in Ottawa in May

Since this month has the highest rainfall, keep an umbrella with you to handle sudden showers. Rain is expected on roughly 14 days, totalling around 138 mm (5.4 in) 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 Ottawa in May

In May, Ottawa sees high temperatures, with highs of 24°C (75°F). Nights drop to around 12°C (54°F). This kind of day-to-night contrast is typical for this time of year. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Ottawa in May

There are approximately 267 hours of sunshine this month, resulting in mostly clear days.

If you prefer enjoying temperate temperatures and rain-free days, October 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.

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• January
• February
• March
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• May
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For a detailed overview over the year and the best time to visit the United States of America, check out our Ottawa's climate page.

Ottawa Temperature in May

Min Temperature 12°C (54°F)  

Max Temperature 24°C (75°F)  

Chance of Rain 47%  

Precipitation 138 mm (5.4 in)  

Rainy days 14 days  

Humidity 68% *  

Sunshine 267 hours *  

Percentage Sunshine 60% *  

* Data from: Topeka, the United States of America (59 KM, 37 Miles).

What to Wear in Ottawa in May

For Ottawa in May, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Ottawa in May

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Ottawa's climate page.

More climate data for Ottawa

Temperature Rainfall Sunshine Humidity

See the full Ottawa climate overview or explore weather in the United States of America.