Will it rain today in Ottawa?
Should you take an umbrella in Ottawa? The forecast below loads live every time you open the page: rain now, when the next shower comes, and how much falls today and tomorrow.
Rain right now
It is raining in Ottawa right now: light rain. Today’s total: 7.7 mm over 9 wet hours. Tomorrow looks dry.
As of 2026-10-16 17:35 UTC (NOAA GFS snapshot). Updating live…
Rain every 3 hours, today and tomorrow
Today · Friday 16 October
7.7 mm of rain, 9 wet hours, up to 1.5 mm/h. (the forecast covers part of the day)
Every 3 hours as a table
| Hours | Rain (mm) | mm/h | Type |
|---|---|---|---|
| 05:00–08:00 | 2.5 | 0.8 | light · rain |
| 08:00–11:00 | 4.6 | 1.5 | light · rain |
| 11:00–14:00 | 0.3 | 0.1 | light · rain |
| 14:00–17:00 | 0.2 | 0.1 | dry |
| 17:00–20:00 | 0.1 | 0 | dry |
| 20:00–23:00 | 0.1 | 0 | dry |
Tomorrow · Saturday 17 October
Dry: no rain in the forecast.
Every 3 hours as a table
| Hours | Rain (mm) | mm/h | Type |
|---|---|---|---|
| 23:00–02:00 | 0.1 | 0 | dry |
| 02:00–05:00 | 0 | 0 | dry |
| 05:00–08:00 | 0 | 0 | dry |
| 08:00–11:00 | 0 | 0 | dry |
| 11:00–14:00 | 0 | 0 | dry |
| 14:00–17:00 | 0 | 0 | dry |
| 17:00–20:00 | 0 | 0 | dry |
| 20:00–23:00 | 0 | 0 | dry |
Times in local time (America/Toronto). Each bar is the rain over 3 hours; striped bars are snow.
Rain map around Ottawa
The same NOAA GFS precipitation on the map, moving hour by hour: blue light, darker heavy. Tap for the value.
How much it rains in Ottawa, month by month
Ottawa gets about 979 mm of rain a year. The wettest month is June (104 mm), the driest February (55 mm); a normal October brings 99 mm.
Average monthly rain and snow (water equivalent) 2001–2025, NASA POWER (MERRA-2 reanalysis, public domain), on a ~50 km grid: mountains and coasts can differ locally.
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Questions
- Will it rain today in Ottawa?
- At 16 October 2026 the forecast said: It is raining in Ottawa right now: light rain. Today’s total: 7.7 mm over 9 wet hours. Tomorrow looks dry. The box at the top of the page loads the latest NOAA GFS forecast every time you open it, with the time the next rain starts.
- How much does it rain in Ottawa?
- About 979 mm a year on average (2001–2025). June is the wettest month with 104 mm, February the driest with 55 mm.
- What do the rain amounts mean?
- 1 mm is a litre of water per square metre. Under 2.5 mm an hour is light rain (a drizzle to a steady rain), 2.5–7.6 moderate, above 7.6 heavy: you get soaked in minutes and streets can flood.
- How accurate is the forecast?
- It is the global NOAA GFS model on a 0.25° grid every 3 hours: good at telling a rainy day from a dry one, less at placing a single summer thunderstorm. Check the rain map for the showers moving around Ottawa.
Rain forecast nearby
Montreal · Toronto · Buffalo · Quebec City · Boston · New York
How this page works
The rain is the one the rain layer of the map paints: NOAA GFS forecast (public domain), precipitation rate averaged over 3 hours, read at Ottawa and summed per local day. Rain or snow comes from the GFS precipitation type. The monthly normals are NASA POWER. No third-party weather service.