Grantham, Ontario Weather
Grantham, 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 Grantham in Niagara.
Marine forecast and fishing conditions near Grantham.
Flight conditions near Grantham. Data source: locating…
Soil conditions, frost risk and crop weather for Grantham.
About Grantham, Ontario
Grantham is a urban community in Niagara, Ontario, Canada. It is classified as a small locality. Grantham is located at 43.2064°N, 79.2253°W. It observes Eastern Time (UTC−5 / −4). Postal code area: L2M.
Grantham occupies a singular position where the steady influence of Lake Ontario tempers the air, anchoring the landscape between the elevation of Palatine Hill and the industrial artery of the Welland Canal. It lies 5.1 km north-north-east of St. Catharines, ON (from St. Catharines, ON: bearing 27°T), and is situated 14.9 km north of Thorold. The atmosphere here often holds a heavy, silvered quality at dusk, caught between the expansive water and the cooling slopes of the land. Residents move with a quiet awareness of the terrain, where the proximity to the Welland Canal marks the pulse of local commerce and movement. Beyond the immediate banks, the Woodend Conservation Area offers a retreat into a quieter, wooded stillness, while DeCew Falls draws those who seek the persistent sound of water falling over the limestone ledges. Grantham maintains a character defined by this intersection of engineered transit and natural features, where the legacy of early settlement persists in the clear, deliberate lines of the orchards and the enduring presence of the canal. Life in Grantham follows the turn of the seasons, shaped by the moisture-laden winds from the lake that sustain the fruit-growing heritage of the region.
Live animated radar for Grantham 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 | Grantham, Niagara, Ontario |
| Coordinates | 43.206389°N, 79.225278°W |
| Timezone | Eastern Time (UTC−5 / −4) |
| Postal FSA | L2M |
| 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 Grantham, Ontario Weather Page
This page provides live weather conditions and forecasts for Grantham, 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 Grantham includes coordinates 43.206389°N, 79.225278°W, situated in Niagara. Postal FSA: L2M. 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.