Toronto

Ontario Weather in May

Average temperatures, rainfall, sunshine and the best places to visit in Ontario, Canada in May.

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Toronto Ottawa Niagara Falls Mississauga

Planning a trip to Ontario, Canada this May? Here's what you need to know about the weather:

What to Expect in Ontario in May

Ontario, Canada is a region in Canada. Ontario, Canada offers a broad spectrum of weather patterns. In May, one might encounter temperatures that range from cold to pleasant, and precipitation levels ranging from moderate to high.

Temperatures

The average maximum daytime temperatures vary from cold in Schreiber at 9°C (48°F) to pleasant in Kemptville at 21°C (70°F). Nighttime temperatures generally drop to 8°C (46°F) in Kemptville and 3°C (37°F) in Schreiber.

For specific regional insights in Ontario, Canada, refer to the map provided below.

Precipitation

In May, precipitation varies across different areas. From moderate rainfall in Niagara on the Lake with an average of 47 mm (1.9 in) to high rainfall in London with 102 mm (4 in).

Average sunshine

Sunshine is generally plentiful throughout many areas. Toronto enjoys about 227 hours of sunlight, ideal for those seeking sunny weather.

Explore Ontario by month

Pick a month to see the average temperature, rainfall and sunshine in Ontario - and find the best time to visit. (based on Toronto)

January1°C (34°F) February1°C (34°F) March5°C (41°F) April10°C (50°F) May16°C (61°F) June22°C (72°F) This monthJuly26°C (79°F) August26°C (79°F) September22°C (72°F) October16°C (61°F) November9°C (48°F) December4°C (39°F)
Best Time to Visit Ontario →

Best Places to Visit in Ontario in May

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Ontario.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Ontario

What is the weather like in May for some of the most popular destinations in Ontario, Canada?

Temperature range in Ontario (May)

Precipitation variation in Ontario (May)

Toronto

In May Toronto generally has moderate temperatures with maximum daytime temperatures around 16°C (61°F), minimum nighttime temperatures around 8°C (46°F) and moderate monthly rainfall. So on average the conditions are good that month.

« April
May
June »
April
May
June
Max temperature
10°C (50°F)
16°C (61°F)
22°C (72°F)
Min temperature
2°C (36°F)
8°C (46°F)
14°C (57°F)
Monthly sun hours
180 hours
227 hours
260 hours
Monthly rainfall
95 mm (3.7 in)
80 mm (3.1 in)
83 mm (3.3 in)
Monthly rainy days
11 days
11 days
10 days
Weather conditions
less favorable
good
excellent
Climate in Toronto →

Ottawa

In May Ottawa generally has pleasant temperatures with maximum daytime temperatures around 20°C (68°F), minimum nighttime temperatures around 7°C (45°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« April
May
June »
April
May
June
Max temperature
12°C (54°F)
20°C (68°F)
25°C (77°F)
Min temperature
1°C (34°F)
7°C (45°F)
12°C (54°F)
Monthly sun hours
188 hours
231 hours
255 hours
Monthly rainfall
98 mm (3.9 in)
93 mm (3.7 in)
105 mm (4.1 in)
Monthly rainy days
11 days
12 days
12 days
Weather conditions
mixed
excellent
very good
Climate in Ottawa →

Niagara Falls

In May Niagara Falls generally has pleasant temperatures with maximum daytime temperatures around 21°C (70°F), minimum nighttime temperatures around 9°C (48°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« April
May
June »
April
May
June
Max temperature
13°C (55°F)
21°C (70°F)
25°C (77°F)
Min temperature
2°C (36°F)
9°C (48°F)
14°C (57°F)
Monthly sun hours
206 hours
259 hours
290 hours
Monthly rainfall
80 mm (3.1 in)
67 mm (2.6 in)
90 mm (3.5 in)
Monthly rainy days
13 days
13 days
13 days
Weather conditions
mixed
excellent
excellent
Climate in Niagara Falls →

Mississauga

In May Mississauga generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 8°C (46°F) and moderate monthly rainfall. So on average the conditions are very good that month.

« April
May
June »
April
May
June
Max temperature
11°C (52°F)
18°C (64°F)
23°C (73°F)
Min temperature
2°C (36°F)
8°C (46°F)
14°C (57°F)
Monthly sun hours
205 hours
230 hours
261 hours
Monthly rainfall
93 mm (3.7 in)
82 mm (3.2 in)
87 mm (3.4 in)
Monthly rainy days
11 days
11 days
10 days
Weather conditions
mixed
very good
excellent
Climate in Mississauga →

Niagara on the Lake

In May Niagara on the Lake generally has moderate temperatures with maximum daytime temperatures around 15°C (59°F), minimum nighttime temperatures around 6°C (43°F) and moderate monthly rainfall. So on average the conditions are good that month.

« April
May
June »
April
May
June
Max temperature
10°C (50°F)
15°C (59°F)
18°C (64°F)
Min temperature
1°C (34°F)
6°C (43°F)
10°C (50°F)
Monthly sun hours
206 hours
259 hours
290 hours
Monthly rainfall
59 mm (2.3 in)
47 mm (1.9 in)
63 mm (2.5 in)
Monthly rainy days
10 days
9 days
9 days
Weather conditions
less favorable
good
very good
Climate in Niagara on the Lake →

Is your destination not in the list? Have a look at all destinations in Ontario, in Canada.

Popular cities in May

Day & night temperatures, rainfall and average weather in Ontario in May.

City Weather Day temp Night temp Rainfall
Toronto 16°C (61°F) 8°C (46°F) 80 mm (3.1 in)
Ottawa 20°C (68°F) 7°C (45°F) 93 mm (3.7 in)
Niagara Falls 21°C (70°F) 9°C (48°F) 67 mm (2.6 in)
Mississauga 18°C (64°F) 8°C (46°F) 82 mm (3.2 in)
Niagara on the Lake 15°C (59°F) 6°C (43°F) 47 mm (1.9 in)
Kingston 18°C (64°F) 10°C (50°F) 85 mm (3.3 in)

Ontario weather in May: frequently asked questions

What is the weather like in Ontario, Canada in May?

Ontario, Canada typically experiences good weather in May, part of the season. Daytime highs in Toronto average around 16°C (61°F), and temperatures drop to about 8°C (46°F) at night.

What is the average temperature in Ontario, Canada in May?

Average temperatures in Ontario, Canada during May range from a nighttime low near 8°C (46°F) to a daytime high around 16°C (61°F) in Toronto.

Does Ontario, Canada get a lot of rain in May?

Rain is generally moderate to light in Ontario, Canada during May, with Toronto averaging close to 80 mm (3.1 in).

Is May a Good Time to Visit Ontario, Canada?

In our opinion, May is a good time to visit Ontario, Canada with overall good weather in Toronto. However, the weather conditions may vary depending on your destination.

Generally speaking, the best visiting conditions can be found in June, July, August and September offering mostly excellent weather in Toronto. In contrast, January, February, March, April, November and December tend to have less favorable weather conditions.

Interested in more climate information?

We have much more information about the climate in Ontario.

Weather and climate has detailed information for every country in the world. Are you going to Canada? Get detailed historical weather averages for many cities in Canada.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.

Visit Algonquin Park

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Canoeing the south Nahannii

The South Nahanni in the northwest of Canada is one of the most impressive wilderness rivers in the world. Canoeing the south Nahanni is something you must add to your bucket list.
See Polar Bears in Churchill Canada

Thousands of bears gather at the small town of Churchill. In the evening the northern lights give a light show against the dark evening sky. An unforgettable experience.
Banff National Park

Snowy mountains, clear blue lakes and green forests make Banff National Park a wonderful bucket list destination. The pristine wilderness is a mecca for walkers.
Must visit in Canada →