Portsmouth, Ontario Weather
Portsmouth, 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 Portsmouth in Frontenac.
Marine forecast and fishing conditions near Portsmouth.
Flight conditions near Portsmouth. Data source: locating…
Soil conditions, frost risk and crop weather for Portsmouth.
About Portsmouth, Ontario
Portsmouth is a urban community in Frontenac, Ontario, Canada. It is classified as a small locality. Portsmouth is located at 44.2221°N, 76.5229°W. It observes Eastern Time (UTC−5 / −4). Postal code area: K7M.
Portsmouth rests quietly upon the limestone edges of Lake Ontario, where the horizon dissolves into a vast, slate-colored expanse. It lies 1.7 km south-west of Kingston, ON (from Kingston, ON: bearing 215°T), and is situated 7.5 km west-north-west of Marysville. The terrain rises toward Lamberts Hill, a modest elevation that catches the late afternoon light, turning the stone buildings and narrow streets into silhouettes against the cooling sky. Air here carries a sharp, damp salinity, a constant reminder of the deep water that shapes the local climate and defines the boundary between land and lake. Beneath the surface of the quiet streets, the weight of the water exerts a subtle pull, drawing the gaze constantly toward the southern shore. The history of Portsmouth holds the echoes of stone-cutting and maritime industry, trades that once defined the daily labor of its inhabitants. While the Cataraqui River (Rideau Canal) flows some distance away, the influence of water-borne commerce remains a ghost in the architecture of the older docks and warehouses. Today, Portsmouth balances the remnants of its industrial past with a more measured pace, where the rhythm of the day aligns with the shifting winds off the lake. Residents move through the neighborhood with a familiarity born of long winters, finding warmth in the enduring limestone structures that have weathered the seasons for generations.
Live animated radar for Portsmouth 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 | Portsmouth, Frontenac, Ontario |
| Coordinates | 44.2221°N, 76.52294°W |
| Timezone | Eastern Time (UTC−5 / −4) |
| Postal FSA | K7M |
| 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 Portsmouth, Ontario Weather Page
This page provides live weather conditions and forecasts for Portsmouth, 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 Portsmouth includes coordinates 44.222100°N, 76.522940°W, situated in Frontenac. Postal FSA: K7M. 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.