Will it rain today in Porto Alegre?
Should you take an umbrella in Porto Alegre? 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 Porto Alegre right now: light rain. Today’s total: 2.9 mm over 12 wet hours. Tomorrow: 2.0 mm of rain.
As of 2026-10-16 17:35 UTC (NOAA GFS snapshot). Updating live…
Rain every 3 hours, today and tomorrow
Today · Friday 16 October
2.9 mm of rain, 12 wet hours, up to 0.3 mm/h. (the forecast covers part of the day)
Every 3 hours as a table
| Hours | Rain (mm) | mm/h | Type |
|---|---|---|---|
| 06:00–09:00 | 0.2 | 0.1 | dry |
| 09:00–12:00 | 0.4 | 0.1 | light · rain |
| 12:00–15:00 | 0.8 | 0.3 | light · rain |
| 15:00–18:00 | 0.9 | 0.3 | light · rain |
| 18:00–21:00 | 0.3 | 0.1 | light · rain |
| 21:00–00:00 | 0.2 | 0.1 | dry |
Tomorrow · Saturday 17 October
2.0 mm of rain, 6 wet hours, up to 0.2 mm/h.
Every 3 hours as a table
| Hours | Rain (mm) | mm/h | Type |
|---|---|---|---|
| 00:00–03:00 | 0.1 | 0 | dry |
| 03:00–06:00 | 0.2 | 0.1 | dry |
| 06:00–09:00 | 0.2 | 0.1 | dry |
| 09:00–12:00 | 0.1 | 0 | dry |
| 12:00–15:00 | 0.3 | 0.1 | dry |
| 15:00–18:00 | 0.4 | 0.1 | light · rain |
| 18:00–21:00 | 0.4 | 0.2 | light · rain |
| 21:00–00:00 | 0.3 | 0.1 | dry |
Times in local time (America/Sao_Paulo). Each bar is the rain over 3 hours; striped bars are snow.
Rain map around Porto Alegre
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 Porto Alegre, month by month
Porto Alegre gets about 1,446 mm of rain a year. The wettest month is September (157 mm), the driest April (98 mm); a normal October brings 155 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 Porto Alegre?
- At 16 October 2026 the forecast said: It is raining in Porto Alegre right now: light rain. Today’s total: 2.9 mm over 12 wet hours. Tomorrow: 2.0 mm of rain. 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 Porto Alegre?
- About 1,446 mm a year on average (2001–2025). September is the wettest month with 157 mm, April the driest with 98 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 Porto Alegre.
Rain forecast nearby
Florianópolis · Curitiba · Punta del Este · Montevideo · Asunción · Buenos Aires
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 Porto Alegre 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.