17.05
sun
sun
Day

82°F
NE 3 mph
Precip.
0%
0%
Night

63°F
NE 4 mph
Precip.
0%
0%
18.05
mon
mon
Day

68°F
NE 16 mph
Precip.
0%
0%
Night

64°F
NE 14 mph
Precip.
0%
0%
19.05
tue
tue
Day

68°F
NE 19 mph
Precip.
0%
0%
Night

63°F
NE 16 mph
Precip.
60%
60%
20.05
wed
wed
Day

52°F
E 9 mph
Precip.
0%
0%
Night

46°F
S 9 mph
Precip.
0%
0%
21.05
thu
thu
Day

48°F
SW 15 mph
Precip.
0%
0%
Night

45°F
W 11 mph
Precip.
0%
0%
22.05
fri
fri
Day

55°F
NW 6 mph
Precip.
100%
100%
Night

54°F
E 8 mph
Precip.
0%
0%
23.05
sat
sat
Day

54°F
E 6 mph
Precip.
0%
0%
Night

52°F
NE 3 mph
Precip.
0%
0%
24.05
sun
sun
Day

59°F
SW 4 mph
Precip.
0%
0%
Night

55°F
NW 6 mph
Precip.
0%
0%
25.05
mon
mon
Day

61°F
SW 4 mph
Precip.
0%
0%
Night

61°F
NE 10 mph
Precip.
100%
100%
26.05
tue
tue
Day

63°F
E 14 mph
Precip.
0%
0%
Night

55°F
SE 8 mph
Precip.
0%
0%
27.05
wed
wed
Day

59°F
SW 8 mph
Precip.
0%
0%
Night

55°F
W 7 mph
Precip.
0%
0%
28.05
thu
thu
Day

59°F
SW 9 mph
Precip.
0%
0%
Night

57°F
W 2 mph
Precip.
0%
0%
29.05
fri
fri
Day

68°F
NE 6 mph
Precip.
0%
0%
Night

64°F
NE 19 mph
Precip.
100%
100%
30.05
sat
sat
Day

55°F
E 22 mph
Precip.
100%
100%
Night

55°F
E 13 mph
Precip.
0%
0%
sea water
temperature
temperature
| Niagara-on-the-Lake |
monthly
weather
weather
| Niagara-on-the-Lake |
current
weather
weather
| Niagara-on-the-Lake |
7 days
forecast
forecast
| Niagara-on-the-Lake |
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 44.3°F. The highest and lowest sea temperatures during the month were 47.7°F and 41.0°F.
Air temperature in Niagara-on-the-Lake, °F
Precipitation total in Niagara-on-the-Lake, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Niagara-on-the-Lake
Niagara-on-the-Lake on a weather map
Places in Canada:
Name
°F
24 Hours Forecast
Niagara-on-the-Lake
Local time: 15:56
May 17, sunday
1800

81°F
NE
2 mph
2 mph
2100

72°F
NW
6 mph
6 mph
May 18, monday
0000

63°F
NE
4 mph
4 mph
0300

57°F
NE
4 mph
4 mph
0600

57°F
NE
11 mph
11 mph
0900

61°F
NE
11 mph
11 mph
1200

68°F
NE
16 mph
16 mph
1500

72°F
NE
17 mph
17 mph




























