• Today

    May 20

    26°Lo 18°

    Pleasant and warmer

    Neutral weather for sinus headaches
    • Hi
      RealFeel
      28°
    • UV
      6 - High
    • Cloud
      Cover
      51%
  • Tue

    May 21

    27°Lo 16°

    A couple of thunderstorms

    Neutral weather for sinus headaches
    • Hi
      RealFeel
      28°
    • UV
      5 - Moderate
    • Cloud
      Cover
      84%
    more
  • Wed

    May 22

    25°Lo 14°

    Variable clouds, a t-storm

    Neutral weather for sinus headaches
    • Hi
      RealFeel
      25°
    • UV
      3 - Moderate
    • Cloud
      Cover
      88%
    more
  • Thu

    May 23

    19°Lo 8°

    A couple of thunderstorms

    At Risk weather for sinus headaches
    • Hi
      RealFeel
      20°
    • UV
      5 - Moderate
    • Cloud
      Cover
      89%
    more
  • Fri

    May 24

    17°Lo 6°

    Breezy with some sun

    Neutral weather for sinus headaches
    • Hi
      RealFeel
      16°
    • UV
      7 - High
    • Cloud
      Cover
      45%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Mon
9am
10am 11am 12pm 1pm 2pm 3pm 4pm
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Mostly Sunny
Mostly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Partly Cloudy
Partly Cloudy
Partly Cloudy
Temp (°C) 14° 17° 19° 21° 23° 24° 25° 26°
RealFeel® 15° 19° 22° 25° 26° 27° 28° 28°
Humidity 80% 75% 69% 65% 62% 61% 58% 57%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (km/h) 10 E 10 ENE 8 ENE 8 ENE 10 NE 8 NE 8 NNE 6 NNE
UV Index 3 4 6 6 6 5 5 4
Cloud Cover 27% 24% 37% 43% 49% 59% 70% 70%
Dew Point 11° 12° 14° 15° 15° 16° 17° 17°
Middle Grid line 30 C Middle Grid line 25 C Middle Grid line 20 C Middle Grid line 15 C Middle Grid line 10 C

Temperature History - May 20

more Historical Weather Data >
  Today Normal Record 5/20/2012
High 26° 20° N/A 18°
Low 18° N/A 13°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:48 AM with 14:51 of sunlight, then sets at 8:39 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:37 PM with 11:44 of moolight, then sets at 3:21 AM

Top Story

St. Catharines Weather Report

The Summer Outlook for Canada

May 20, 2013; 5:44 AM ET

The Accuweather.com summer forecast for Canada. more >