The best times to visit Sines for ideal weather are

March 19th to October 14th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Sines Travel Info

Weather in Sines


Average temperatures in Sines vary somewhat. Considering humidity, temperatures feel nice most of the year, excluding some cold weeks in the winter, with a low chance of precipitation most of the year. The area is more temperate than most — in the 70th 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 Sines, the hottest months are August, September, and then July. See average monthly temperatures below. The warmest time of year is generally early to mid August where highs are regularly around 79°F (26.1°C) with temperatures rarely dropping below 62.2°F (16.8°C) at night.

Sines Temperatures (Fahrenheit)


Sines Temperatures (Celsius)


“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.

Sines Perceived Temperature (F)


Sines Perceived Temperature (C)



Average Sines 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)
Jan 59.1 53 47.8
Feb 59.5 53 47.4
Mar 63.4 55.6 49.4
Apr 66.6 58.9 52.6
May 71.3 62.6 55.6
Jun 74.5 66.1 59.2
Jul 76.1 67.5 60.5
Aug 77.4 68.3 61.3
Sep 76 67.5 61.4
Oct 73 65 59.1
Nov 64.5 57.8 52.1
Dec 60.5 54 48.5

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 15.1 11.7 8.8
Feb 15.3 11.7 8.6
Mar 17.4 13.1 9.7
Apr 19.2 14.9 11.4
May 21.8 17 13.1
Jun 23.6 18.9 15.1
Jul 24.5 19.7 15.8
Aug 25.2 20.2 16.3
Sep 24.4 19.7 16.3
Oct 22.8 18.3 15.1
Nov 18.1 14.3 11.2
Dec 15.8 12.2 9.2



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Sines are July, August, and then June. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late June. For example, on the week of June 25th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid February with an average of 2 days of significant precipitation the week of February 12th.

When can you find snow in Sines? 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 Sines.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Sines (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 24% 0 2.6
Feb 26% 0 2.3
Mar 13% 0 1.7
Apr 15% 0 2
May 9% 0 1
Jun 3% 0 0.3
Jul 0% 0 0
Aug 0% 0 0
Sep 8% 0 1
Oct 17% 0 2.4
Nov 23% 0 3.2
Dec 19% 0 2.7

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 24 0 6.6
Feb 26 0 5.8
Mar 13 0 4.3
Apr 15 0 5.1
May 9 0 2.5
Jun 3 0 0.8
Jul 0 0 0
Aug 0 0 0
Sep 8 0 2.5
Oct 17 0 6.1
Nov 23 0 8.1
Dec 19 0 6.9


Humidity and Wind

Sines has some very humid months, and above average humidity throughout the year. The least humid month is May (65.6% relative humidity), and the most humid month is January (73.6%).

Wind in Sines is usually moderate. The windiest month is July, followed by February and March. July’s average wind speed of around 9.5 knots (11 MPH or 17.7 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early July where average top sustained speeds reach 16.4 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Sines.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

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 8.3 Gentle breeze 12.9 Significant breeze
Feb 9 Gentle breeze 14.1 Significant breeze
Mar 8.8 Gentle breeze 13.7 Significant breeze
Apr 8 Gentle breeze 13.4 Significant breeze
May 8.6 Gentle breeze 13.5 Significant breeze
Jun 8.4 Gentle breeze 13.5 Significant breeze
Jul 9.5 Gentle breeze 14.9 Significant breeze
Aug 8.6 Gentle breeze 14 Significant breeze
Sep 7.3 Gentle breeze 12 Significant breeze
Oct 7.5 Gentle breeze 11.9 Significant breeze
Nov 8.2 Gentle breeze 12.6 Significant breeze
Dec 8.2 Gentle breeze 12.9 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 73.6%
Feb 71.3%
Mar 68.2%
Apr 69.7%
May 65.6%
Jun 67%
Jul 68.5%
Aug 68.3%
Sep 70.9%
Oct 68.8%
Nov 68.1%
Dec 72.5%


Is it Safe to Travel to Sines?

Our best data indicates this area is generally safe. As of Oct 07, 2019 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 Aug 22, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Sines, Portugal is April, followed by January and May. 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 Sines in October. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 50.9 in October means 50.9% of the tourists vs. April.



Overall Sines Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 73.7°F (23.2°C) and 60.8°F (16°C) with warmer temperatures in the later months. Rain is somewhat common with 3 to 5 days of significant precipitation per month. Spring is the 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 0 to 1 days of precipitation per month. June – August is fairly slow season for tourism in Sines, so lodging and other accommodations may cost slightly less.

Fall (September through November)

Fall daily highs range from 77.1°F (25.1°C) and 59.6°F (15.3°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 2 to 7 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 Sines to be enjoyable for warm weather travelers. The average high during this season is between 61.6°F (16.4°C) and 57.6°F (14.2°C). On average, it rains or snows a fair amount: 6 to 7 times per month. These times of year are the second busiest with tourists.


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