--- title: "10 Day Weather Forecast for Grafton, Ontario, CA" description: "Get the latest 10 day weather forecast for Grafton, Ontario, CA. Stay prepared with accurate and up-to-date weather information to plan your week ahead." location: "Grafton, Ontario, CA" canonical: "https://www.weatherbug.com/weather-forecast/10-day-weather/grafton-ontario-ca" coordinates: ["44.00012,-78.01621"] temperature_units: "°F" last_updated: "2026-05-27T18:01:00.0000000Z" source: "WeatherBug" --- # 10 Day Weather Forecast for Grafton, Ontario, CA Get the latest 10-day weather forecast for Grafton, Ontario, CA, including day and night conditions, high and low temperatures, wind speed and direction and precipitation chances. Forecast issued on 2026-05-27T18:01:00+00:00. ## 10 Day Weather Forecast | Date | Day Forecast | Night Forecast | High °F | Low °F | | ---------- | ------------------------------------------------ |------------------------------------------------| -------: | -------: | | Wed, May 27 | Mostly sunny. High temperature around 65F. Dew point will be around 49F with an average humidity of 61%. Winds will be 4 mph from the W. | Partly cloudy. Low temperature around 52F. Dew point will be around 48F with an average humidity of 71%. Winds will be 7 mph from the N. | 65°F | 52°F | | Thu, May 28 | Partly cloudy. High temperature around 60F. Dew point will be around 46F with an average humidity of 63%. Winds will be 8 mph from the N. | Partly cloudy. Low temperature around 49F. Dew point will be around 46F with an average humidity of 79%. Winds will be 5 mph from the NW. | 60°F | 49°F | | Fri, May 29 | Mostly cloudy. High temperature around 64F. Dew point will be around 47F with an average humidity of 61%. Winds will be 8 mph from the W. | Mostly clear. Low temperature around 48F. Dew point will be around 44F with an average humidity of 64%. Winds will be 9 mph from the N. | 64°F | 48°F | | Sat, May 30 | Mostly sunny. High temperature around 60F. Dew point will be around 41F with an average humidity of 59%. Winds will be 8 mph from the N. | Mostly clear. Low temperature around 46F. Dew point will be around 43F with an average humidity of 75%. Winds will be 3 mph from the NW. | 60°F | 46°F | | Sun, May 31 | Mostly cloudy. High temperature around 64F. Dew point will be around 43F with an average humidity of 54%. Winds will be 6 mph from the NW. | Mostly cloudy. Low temperature around 49F. Dew point will be around 44F with an average humidity of 65%. Winds will be 4 mph from the NW. | 64°F | 49°F | | Mon, Jun 1 | Mostly sunny with a chance of rain. Chance of precipitation 35%. High temperature around 61F. Dew point will be around 45F with an average humidity of 62%. Winds will be 3 mph from the N. | Mostly clear with a slight chance of rain. Chance of precipitation 25%. Low temperature around 47F. Dew point will be around 45F with an average humidity of 75%. Winds will be 3 mph from the N. | 61°F | 47°F | | Tue, Jun 2 | Mostly sunny. High temperature around 60F. Dew point will be around 45F with an average humidity of 65%. Winds will be 5 mph from the N. | Clear. Low temperature around 50F. Dew point will be around 45F with an average humidity of 68%. Winds will be 2 mph from the N. | 60°F | 50°F | | Wed, Jun 3 | Sunny. High temperature around 64F. Dew point will be around 47F with an average humidity of 62%. Winds will be 2 mph from the SW. | Clear. Low temperature around 54F. Dew point will be around 49F with an average humidity of 71%. Winds will be 2 mph from the SW. | 64°F | 54°F | | Thu, Jun 4 | Sunny. High temperature around 66F. Dew point will be around 50F with an average humidity of 64%. Winds will be 4 mph from the SW. | Mostly clear. Low temperature around 56F. Dew point will be around 52F with an average humidity of 74%. Winds will be 5 mph from the SW. | 66°F | 56°F | | Fri, Jun 5 | Mostly sunny with a slight chance of rain. Chance of precipitation 25%. High temperature around 66F. Dew point will be around 53F with an average humidity of 70%. Winds will be 7 mph from the SW. | Mostly clear with a chance of rain. Chance of precipitation 35%. Low temperature around 57F. Dew point will be around 54F with an average humidity of 77%. Winds will be 4 mph from the W. | 66°F | 57°F | ## Source Information - Source: "https://www.weatherbug.com/weather-forecast/10-day-weather/grafton-ontario-ca" - Last Updated: "2026-05-27T18:01:00+00:00"