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Niagara Falls Weather in May
In Niagara Falls, May brings pleasant daytime temperatures around 21°C (70°F), with nights cooling to 9°C (48°F). Expect quite a bit of rainfall this month.
Rainfall in Niagara Falls in May
You can typically expect 13 days of rain this month, averaging around 67 mm (2.6 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Niagara Falls in May
May is a good time to be in Niagara Falls. Days are excellent, reaching 21°C (70°F), with nights around 9°C (48°F). The difference between afternoon and evening temperatures is usually noticeable. At 9°C (48°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Niagara Falls in May
There are approximately 259 hours of sunshine this month, resulting in mostly clear days.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August and September typically offer the best weather for Niagara Falls.
Niagara Falls Temperature in May
Min Temperature
9°C (48°F)
Max Temperature
21°C (70°F)
Chance of Rain
43%
Precipitation
67 mm (2.6 in)
Rainy days
13 days
Humidity
67% *
Sunshine
259 hours *
Percentage Sunshine
57% *
* Data from: Buffalo, the United States of America (28 KM, 17 Miles).
Niagara Falls Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Niagara Falls - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Niagara Falls typically rise from around 16°C (61°F) at the start of May to approximately 22°C (72°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 13°C (55°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Niagara Falls in May
Browse day-by-day weather records for Niagara Falls spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Niagara Falls historical weather extremes in May
The extremes listed below come from historical weather data collected in Niagara Falls from 1976 through 2026.
- On May 21, 1977, temperatures climbed to 33°C (91°F), marking the warmest May day on record.
- Nighttime temperatures dropped to -2°C (28°F) on May 12, 2020, marking the coldest May night on record.
Best Places in Canada in May
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in May →
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).
What to Wear in Niagara Falls in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Niagara Falls in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Barbeque8/10 -
Camping4/10 -
Outdoor sports10/10
Niagara Falls 3-Day Forecast
More climate data for Niagara Falls
Temperature Rainfall Sunshine Humidity
See the full Niagara Falls climate overview or explore weather in Canada.
Popular in May
Where to go in May - average daytime high across popular destinations.
Niagara Falls
21°C (70°F) Montréal20°C (68°F) Ottawa20°C (68°F) Quebec City19°C (66°F) Calgary17°C (63°F) Vancouver16°C (61°F) Toronto16°C (61°F) Whistler11°C (52°F) Bucket list
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