Porto, Portugal Weather
Porto hourly forecast: next 24 hours
Today's high of 81°F (27°C) is about 7°F (4°C) above the typical September high of 74°F (24°C).
Current conditions in detail
Porto weather tomorrow (Wednesday, September 16)
Tomorrow in Porto looks sunny, with a high of 83° and an overnight low of 61°. Rain is unlikely (3% chance). Winds top out near 12 mph, and the UV index reaches 5 (moderate).
Porto 14-day forecast
About the weather in Porto
Porto runs on a dry-summer rhythm: the warmest months are also the driest. July averages 13 mm (0.5 in) while the wet season peaks in October at 7.2 inches (183 mm). Highs range from 56°F (14°C) to 76°F (24°C).
Porto weather: quick facts
- Hottest month: July - highs near 76°F (24°C)
- Coldest month: January - highs near 56°F (14°C)
- Decade extremes (2015-2024): 99°F (37°C) high · 32°F (0°C) low
- Wettest month: October (13 rainy days) · Sunniest: July (13.4 h sun/day)
- Climate type: oceanic
- Annual swing: 10°C between the average warmest and coolest month · day to night: 7°C
- Average humidity: 79%
Temperatures through the year
2 months average under 20 mm of rain, the longest unbroken stretch running July through August. At its warmest, in July, Porto runs to 76°F (24°C) in the afternoon and back to 62°F (17°C) by dawn. January is the coolest month, with highs of 56°F (14°C) and lows near 45°F (7°C). Relative humidity averages 79% across the year, more humid than roughly 80% of the cities we track.
Rain, sun and snow
Five of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is May through September. Precipitation concentrates in October - 7.2 inches (183 mm) on 13 days - and thins out by July. Sunshine averages 9.7 hours a day over the year, peaking in July at 13.4 hours. The gridded 2015-2024 daily record for this location tops out at 99°F (37°C) and bottoms at 32°F (0°C) - decade extremes, not all-time station records.
Season by season
Spring (March through May)
Spring runs cool rather than cold here - highs near 64°F (18°C), nights near 51°F (11°C), and rain falls on around 35 of the 90 days. Daylight is generous - around 10.5 hours of sun a day.
Summer (June through August)
Summer settles into easy warmth here - highs near 75°F (24°C), nights near 61°F (16°C), and rain comes on about 14 days over the three months. Daylight is generous - around 12.8 hours of sun a day.
Fall (September through November)
Fall in Porto settles into easy warmth, with daytime highs averaging 68°F (20°C) and nights around 56°F (13°C); rain falls on around 32 of the 90 days.
Winter (December through February)
Winter stays on the cool side of mild here - highs near 58°F (14°C), nights near 46°F (8°C), and rain falls on around 35 of the 90 days.
Average temperatures in Porto by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 56° | 45° | 12 | 6.4 in | 6.6 h/day | 79% |
| February | 58° | 46° | 10 | 4.7 in | 7.9 h/day | 78% |
| March | 60° | 47° | 13 | 5.8 in | 9.0 h/day | 77% |
| April | 64° | 51° | 12 | 5.3 in | 10.7 h/day | 78% |
| May | 68° | 55° | 9 | 3.3 in | 11.8 h/day | 77% |
| June | 71° | 59° | 8 | 2.0 in | 13.0 h/day | 81% |
| July | 76° | 62° | 3 | 0.5 in | 13.4 h/day | 78% |
| August | 76° | 62° | 3 | 0.5 in | 12.1 h/day | 77% |
| September | 74° | 60° | 6 | 2.7 in | 10.8 h/day | 77% |
| October | 69° | 57° | 13 | 7.2 in | 8.1 h/day | 80% |
| November | 62° | 51° | 14 | 6.6 in | 6.8 h/day | 82% |
| December | 58° | 48° | 14 | 7.1 in | 6.4 h/day | 81% |