Ottawa Weather in May
In May, Ottawa averages a high of 19°C (67°F) and a low of 8°C (46°F), based on 56 years of historical weather data from OTTAWA CDA.
19°C
Average high
67°F
8°C
Average low
46°F
35°C
Record high
95°F · 2010
-3°C
Record low
27°F · 1978
What to Expect in Ottawa in May
Typical May days in Ottawa reach 19°C (67°F) during the afternoon and cool to around 8°C (46°F) overnight. On average, measurable rain falls on about 42% of days this month. Over the past 56 years, May temperatures in Ottawa have ranged from a record high of 35°C (2010) down to a record low of -3°C (1978).
For a day-by-day look or other months, see the full Ottawa weather history.