The best times to visit Viana do Castelo for ideal weather are
April 16th to November 4th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Viana do Castelo Travel Guide
Other Viana do Castelo Travel Info
Weather in Viana do Castelo
Temperature
Average temperatures in Viana do Castelo vary somewhat. Considering humidity, temperatures feel nice most of the year, excluding some cold weeks in the winter, with a fair chance of precipitation about half of the year. The area is somewhat temperate — in the 50th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Viana do Castelo, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally late August to early September where highs are regularly around 77.8°F (25.4°C) with temperatures rarely dropping below 59.7°F (15.4°C) at night.
Viana do Castelo Temperatures (Fahrenheit)
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Viana do Castelo Temperatures (Celsius)
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“Feels-Like” Temperatures
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Viana do Castelo Perceived Temperature (F)
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Viana do Castelo Perceived Temperature (C)
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Average Viana do Castelo Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
Show Fahrenheit
Month | Avg. High (°F) | Avg. Mean (°F) | Avg. Low (°F) |
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Jan | 55.6 | 48.8 | 43.3 |
Feb | 57.9 | 49.4 | 42.8 |
Mar | 62.3 | 52.9 | 45.4 |
Apr | 65.8 | 56.5 | 48.7 |
May | 69.3 | 59.9 | 51.7 |
Jun | 72.9 | 64 | 56 |
Jul | 75.1 | 65.8 | 57.9 |
Aug | 76.2 | 66.3 | 58.3 |
Sep | 75.4 | 64.9 | 57.1 |
Oct | 70 | 60.5 | 53.7 |
Nov | 61 | 53.1 | 47 |
Dec | 56.9 | 49.5 | 43.7 |
Show Celsius
Month | Avg. High (°C) | Avg. Mean (°C) | Avg. Low (°C) |
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Jan | 13.1 | 9.3 | 6.3 |
Feb | 14.4 | 9.7 | 6 |
Mar | 16.8 | 11.6 | 7.4 |
Apr | 18.8 | 13.6 | 9.3 |
May | 20.7 | 15.5 | 10.9 |
Jun | 22.7 | 17.8 | 13.3 |
Jul | 23.9 | 18.8 | 14.4 |
Aug | 24.6 | 19.1 | 14.6 |
Sep | 24.1 | 18.3 | 13.9 |
Oct | 21.1 | 15.8 | 12.1 |
Nov | 16.1 | 11.7 | 8.3 |
Dec | 13.8 | 9.7 | 6.5 |
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Viana do Castelo are July, August, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid July. For example, on the week of July 16th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid January with an average of 4 days of significant precipitation the week of January 15th.
When can you find snow in Viana do Castelo? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Viana do Castelo.
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Snow on the Ground
The graph below shows the average snow on the ground in Viana do Castelo (in).
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Average Rain and Snow by Month
Show Inches
Month | Daily Chance of Rain | Average Snow Depth (in) | Total Precipitation (in) |
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Jan | 41% | 0 | 6.5 |
Feb | 36% | 0 | 4.6 |
Mar | 25% | 0 | 3.5 |
Apr | 28% | 0 | 3.2 |
May | 24% | 0 | 3.5 |
Jun | 14% | 0 | 2.2 |
Jul | 8% | 0 | 1.2 |
Aug | 10% | 0 | 1.4 |
Sep | 14% | 0 | 2.6 |
Oct | 27% | 0 | 7.3 |
Nov | 38% | 0 | 5.9 |
Dec | 34% | 0 | 6.1 |
Show Centimeters
Month | Daily Chance of Rain | Average Snow Depth (cm) | Total Precipitation (cm) |
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Jan | 41 | 0 | 16.5 |
Feb | 36 | 0 | 11.7 |
Mar | 25 | 0 | 8.9 |
Apr | 28 | 0 | 8.1 |
May | 24 | 0 | 8.9 |
Jun | 14 | 0 | 5.6 |
Jul | 8 | 0 | 3 |
Aug | 10 | 0 | 3.6 |
Sep | 14 | 0 | 6.6 |
Oct | 27 | 0 | 18.5 |
Nov | 38 | 0 | 15 |
Dec | 34 | 0 | 15.5 |
Humidity and Wind
Viana do Castelo has some extremely humid months, and above average humidity throughout the year. The least humid month is March (66.9% relative humidity), and the most humid month is January (82.1%).
Wind in Viana do Castelo is usually calm. The windiest month is March, followed by February and May. March’s average wind speed of around 4.9 knots (5.6 MPH or 9 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid July where average top sustained speeds reach 8.8 knots, which is considered a gentle breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Viana do Castelo.
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Wind
The graph below shows wind speed (max and average) in knots.
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Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
Month | Avg. Wind | Avg. Wind Feel | Sustained High Wind | High Wind Feel |
Jan | 4.4 | Light breeze | 6.9 | Light breeze |
Feb | 4.8 | Light breeze | 7.8 | Gentle breeze |
Mar | 4.9 | Light breeze | 7.8 | Light breeze |
Apr | 4.5 | Light breeze | 7.6 | Gentle breeze |
May | 4.7 | Light breeze | 8.1 | Light breeze |
Jun | 4.7 | Light breeze | 8.1 | Gentle breeze |
Jul | 4.3 | Light breeze | 8.3 | Light breeze |
Aug | 4.1 | Light breeze | 7.9 | Gentle breeze |
Sep | 3.9 | Barely noticeable | 7.2 | Light breeze |
Oct | 3.9 | Barely noticeable | 6.7 | Light breeze |
Nov | 4.1 | Light breeze | 6.9 | Light breeze |
Dec | 4.4 | Light breeze | 7 | Gentle breeze |
Show Relative Humidity by Month
Month | Avg. Relative Humidity |
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Jan | 82.1% |
Feb | 73.9% |
Mar | 66.9% |
Apr | 69.1% |
May | 67.7% |
Jun | 69.1% |
Jul | 70.6% |
Aug | 70.1% |
Sep | 69.3% |
Oct | 75.8% |
Nov | 78% |
Dec | 77.8% |
Is it Safe to Travel to Viana do Castelo?
Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for Portugal; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Oct 30, 2023.
The Busiest and Least Crowded Months
The busiest month for tourism in Viana do Castelo, Portugal is May, followed by August and July. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Viana do Castelo in November. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
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Overall Viana do Castelo Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderate. Highs range from 72°F (22.2°C) and 59.3°F (15.2°C) with warmer temperatures in the later months. Rain is somewhat common with roughly 8 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the least precipitation with 3 to 4 days of precipitation per month. June – August is the busiest season for tourism in Viana do Castelo, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 76.4°F (24.7°C) and 56.3°F (13.5°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 4 to 11 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.
Winter (December through February)
Weather is too cold this time of year in Viana do Castelo to be enjoyable for warm weather travelers. The average high during this season is between 59.4°F (15.2°C) and 55.2°F (12.9°C). On average, it rains or snows a great amount: 10 to 13 times per month. These times of year are fairly slow with tourists.
Best Times to Travel› Portugal › Viana do Castelo, Portugal