Grammar Airport Weather Forecast
- 28
- 44
Rain Showers Likely
- 24
- 39
Slight Chance Snow Showers
- 41
- 53
Mostly Cloudy
- 38
- 59
Partly Sunny
- 45
- 64
Partly Sunny
- 49
- 68
Mostly Cloudy
Today 19 Apr Ontario
Mostly cloudy through early Afternoon, then becoming partly sunny. Rain Showers with snow Showers likely Early, then a chance of rain and snow Showers late this morning. A chance of rain Showers early this Afternoon, then rain Showers likely late. Little or no snow accumulation. Cold with Highs Ranging from the upper 30s on the Hilltops to the mid 40s across the lower Elevations. Northwest Winds 5 to 10 Mph, increasing to 10 to 15 Mph. Chance of precipitation 80 percent.
Tonight 19 Apr Ontario
Mostly cloudy. A chance of rain and snow Showers in the Evening, then a chance of snow Showers overnight. Cold with Lows in the upper 20s. West Winds 10 to 15 Mph, Diminishing to 5 to 10 Mph. Chance of precipitation 50 percent.
Grammar Airport Temperature Statistics
April Temperature
Penn Yan, Penn Yan Airport (16.2 miles)
Lowest 8 April, 2026
18 °FAverage April
48.6 °FHighest 16 April, 2026
80.1 °F
Climate (2021–Present)
Penn Yan, Penn Yan Airport (16.2 miles)
Average Low 2021–2026
41.8 °FAverage 2021–2026
50.4 °FAverage High 2021–2026
59.1 °F