Johnstown, Ontario Weather
Johnstown, 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 Johnstown in Grenville.
Marine forecast and fishing conditions near Johnstown.
Flight conditions near Johnstown. Data source: locating…
Soil conditions, frost risk and crop weather for Johnstown.
About Johnstown, Ontario
Johnstown is a compact rural community in Grenville, Ontario, Canada. It is classified as a town. Johnstown is located at 44.7481°N, 75.4697°W. It observes Eastern Time (UTC−5 / −4). Postal code area: K0E.
Johnstown rests upon the firm, low-lying earth along the northern edge of the St. Lawrence River, where the horizon broadens to accommodate the steady, relentless passage of deep-water vessels. It lies 5.5 km north-east of Prescott, ON (from Prescott, ON: bearing 43°T), and is situated 14.2 km east-south-east of McLeanville. The landscape here is defined by a quiet gravity, marked by the rising prominence of the Fells Hill which breaks the flatness of the surrounding fields. At dusk, the light catches the surface of the river, turning the currents into a hammered sheet of silver that seems to hold the sky in place, while the air carries a persistent, cool dampness rising from the water’s edge. Even at a distance of ten kilometers, the South Nation River exerts a subtle influence on the terrain, ensuring the soil retains a hidden, dark moisture that sustains the local vegetation through the height of the summer heat. The identity of Johnstown has long been shaped by its proximity to the water, which serves as both a gateway for commerce and a boundary for the local industry that anchors the economy. Massive grain elevators stand as stark, vertical monuments against the sky, their presence signaling a role in the movement of goods that defines the character of the shore. Life in Johnstown moves with the deliberate pace of the freight ships, a steady and predictable momentum that keeps the residents connected to the wider world even as they remain rooted in the quietude of the Ontario landscape. The history of the region lingers in the way the morning mist clings to the docks, a reminder of the generations who have watched the same river bend around the bend of the land, finding purpose in the constant, quiet work of the port.
Live animated radar for Johnstown 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 | Johnstown, Grenville, Ontario |
| Coordinates | 44.748055°N, 75.469722°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 Johnstown, Ontario Weather Page
This page provides live weather conditions and forecasts for Johnstown, 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 Johnstown includes coordinates 44.748055°N, 75.469722°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.