Mainsville, Ontario Weather
Mainsville, Ontario — live current conditions, hourly and 7-day forecasts, ECCC alerts, aviation weather, radar and satellite imagery, marine and fishing conditions with a solunar forecast, soil and crop conditions for Mainsville in Grenville.
Marine forecast and fishing conditions near Mainsville.
Flight conditions near Mainsville. Data source: locating…
Soil conditions, frost risk and crop weather for Mainsville.
About Mainsville, Ontario
Mainsville is a locality in Grenville, Ontario, Canada. It is classified as a village / hamlet. Mainsville is located at 44.8186°N, 75.4353°W. It observes Eastern Time (UTC−5 / −4). Postal code area: K0E.
Mainsville rests upon the low, patient shore of the St. Lawrence River, where the horizon broadens to accommodate the slow, heavy movement of the currents. It lies 9.6 km west-south-west of Iroquois, ON (from Iroquois, ON: bearing 252°T), and is situated 13.5 km north-north-east of Prescott. The presence of Fells Hill offers a slight, terrestrial rise against the flatness of the surrounding fields, catching the amber light of dusk before it slips entirely into the water. In the cooler hours, the air carries a crisp, mineral clarity that seems to sharpen the outlines of the barns and the long, thin fences marking the agricultural plots. The South Nation River, winding its way through the landscape about 9 km away, acts as a distant pulse, a reminder of the interconnected veins of water that define the tilt and drainage of the earth here. History in Mainsville lingers in the sturdy masonry of older foundations and the way the local economy leans into the steady output of the land. Generations have worked these fields, their lives dictated by the turning of seasons and the persistent, reliable demands of regional harvest. There is a quiet, functional beauty in how the people of Mainsville attend to their tasks, moving with a familiarity that ignores the need for haste. The local identity remains rooted in this agricultural persistence, where the changing colors of the crops provide the primary calendar for the year. Even as the modern world encroaches, the stillness of the riverbank provides a persistent anchor, ensuring that the character of the land stays consistent beneath the vast, open sky.
Live animated radar for Mainsville and surroundings — RainViewer.
NOAA GOES-19 GEOCOLOR — Canada / Northern U.S. sector. Auto-refreshes every 10 minutes on page reload. Frames the whole country from Newfoundland to the BC coast, plus adjacent Pacific and Atlantic storm approaches.
Source: NOAA/NESDIS GOES-19 · Public domain · Sector code can (Canada / Northern U.S.) · Auto-updates on page reload
| Location | Mainsville, Grenville, Ontario |
| Coordinates | 44.818611°N, 75.435278°W |
| Timezone | Eastern Time (UTC−5 / −4) |
| Postal FSA | K0E |
| Area Code | 226, 249, 289, 343, 365, 382, 416, 437, 519, 548, 613, 647, 705, 742, 807, 905 |
| Page generated | July 2026 |
| Weather data | Open-Meteo (open-source), Environment and Climate Change Canada |
About This Mainsville, Ontario Weather Page
This page provides live weather conditions and forecasts for Mainsville, Ontario, including current conditions, a 24-hour hourly forecast, 7-day outlook, ECCC extended text forecast, real-time aviation weather (live METAR and TAF reports from the nearest reporting airport, with a modelled estimate shown when no station is in range), precipitation radar and NOAA GOES satellite imagery. Additional sections may include marine and fishing conditions with a solunar forecast for coastal localities, and soil temperature, crop weather and live Water Survey of Canada river gauge data for agricultural areas near a monitored waterway. All data updates automatically on every page visit.
Location data for Mainsville includes coordinates 44.818611°N, 75.435278°W, situated in Grenville. Postal FSA: K0E. Telephone area code: 226, 249, 289, 343, 365, 382, 416, 437, 519, 548, 613, 647, 705, 742, 807, 905. Timezone: Eastern Time (UTC−5 / −4).
Weather data is sourced from Environment and Climate Change Canada (ECCC) and the open-source Open-Meteo API. Aviation data is sourced from aviationweather.gov, with a modelled estimate used where no nearby reporting station is available. River and stream data is sourced from Water Survey of Canada (WSC) via the ECCC GeoMet realtime hydrometric feed. Marine and solunar data are modelled from Open-Meteo and public sunrise/moon calculations and should be treated as a general guide alongside on-the-water conditions. Radar is provided by RainViewer. Satellite imagery is sourced from NOAA/NESDIS GOES-19 and is public domain.