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Summer Weather in Santarém Portugal

Daily high temperatures increase by 8°F, from 80°F to 88°F, rarely falling below 69°F or exceeding 104°F. The highest daily average high temperature is 90°F on July 28.

Daily low temperatures increase by 5°F, from 57°F to 62°F, rarely falling below 51°F or exceeding 70°F. The highest daily average low temperature is 64°F on July 29.

For reference, on July 28, the hottest day of the year, temperatures in Santarém typically range from 64°F to 90°F, while on January 18, the coldest day of the year, they range from 42°F to 59°F.

Average High and Low Temperature in the Summer in Santarém

Average High and Low Temperature in the Summer in SantarémJunJulAug45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°F105°F105°FSpringFallJul 2890°FJul 2890°F64°F64°FJun 180°FJun 180°F57°F57°FAug 3188°FAug 3188°F62°F62°FJul 187°FJul 187°F62°F62°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in the Summer in Santarém

Average Hourly Temperature in the Summer in SantarémJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSpringFallNowNowcoldcoolcoolcomfortablecomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

La Crescenta-Montrose, California, United States (5,663 miles away); Montes, Uruguay (5,915 miles); and Darlington, Western Australia, Australia (9,350 miles) are the far-away foreign places with temperatures most similar to Santarém (view comparison).

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The summer in Santarém experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 32% to 24%. The lowest chance of overcast or mostly cloudy conditions is 10% on July 19.

The clearest day of the summer is July 19, with clear, mostly clear, or partly cloudy conditions 90% of the time.

For reference, on December 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 52%, while on July 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.

Cloud Cover Categories in the Summer in Santarém

Cloud Cover Categories in the Summer in SantarémJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallDec 1548%Dec 1548%Jun 168%Jun 168%Aug 3176%Aug 3176%Jul 186%Jul 186%Aug 189%Aug 189%NowNowclearmostly clearovercastmostly cloudypartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santarém, the chance of a wet day over the course of the summer is rapidly decreasing, starting the season at 13% and ending it at 6%.

For reference, the year's highest daily chance of a wet day is 31% on October 30, and its lowest chance is 2% on July 20.

Probability of Precipitation in the Summer in Santarém

Probability of Precipitation in the Summer in SantarémJunJulAug0%0%2%2%4%4%6%6%8%8%10%10%12%12%14%14%16%16%18%18%20%20%22%22%24%24%SpringFallJul 182%Jul 182%Jun 113%Jun 113%Aug 316%Aug 316%Jul 14%Jul 14%Aug 13%Aug 13%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Santarém is gradually decreasing, starting the season at 1.0 inches, when it rarely exceeds 2.6 inches or falls below 0.1 inches, and ending the season at 0.6 inches, when it rarely exceeds 1.4 inches.

The lowest average 31-day accumulation is 0.1 inches on July 26.

Average Monthly Rainfall in the Summer in Santarém

Average Monthly Rainfall in the Summer in SantarémJunJulAug0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 in4.0 in4.0 inSpringFallJul 260.1 inJul 260.1 inJun 11.0 inJun 11.0 inAug 310.6 inAug 310.6 inJul 10.3 inJul 10.3 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the summer in Santarém, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 42 minutes, implying an average daily decrease of 1 minute, 7 seconds, and weekly decrease of 7 minutes, 50 seconds.

The shortest day of the summer is August 31, with 13 hours, 4 minutes of daylight and the longest day is June 20, with 14 hours, 56 minutes of daylight.

Hours of Daylight and Twilight in the Summer in Santarém

Hours of Daylight and Twilight in the Summer in SantarémJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2014 hr, 56 minJun 2014 hr, 56 minnightnightdaydayAug 3113 hr, 4 minAug 3113 hr, 4 minAug 114 hr, 11 minAug 114 hr, 11 minNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the summer in Santarém is 6:07 AM on June 13 and the latest sunrise is 55 minutes later at 7:02 AM on August 31.

The latest sunset is 9:05 PM on June 27 and the earliest sunset is 59 minutes earlier at 8:06 PM on August 31.

Daylight saving time is observed in Santarém during 2024, but it neither starts nor ends during the summer, so the entire season is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:08 AM and sets 14 hours, 56 minutes later, at 9:04 PM, while on December 21, the shortest day of the year, it rises at 7:50 AM and sets 9 hours, 24 minutes later, at 5:15 PM.

Sunrise & Sunset with Twilight in the Summer in Santarém

Sunrise & Sunset with Twilight in the Summer in SantarémJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSpringFall6:07 AM6:07 AMJun 139:02 PMJun 139:02 PM7:02 AM7:02 AMAug 318:06 PMAug 318:06 PM6:12 AM6:12 AMJul 19:05 PMJul 19:05 PM6:35 AM6:35 AMAug 18:46 PMAug 18:46 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the summer. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in the Summer in Santarém

Solar Elevation and Azimuth in the Summer in SantarémJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSpringFall0010202030304050506060700010102030304040506070NowNow
northeastsouthwest
Solar elevation and azimuth in the the summer of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the summer of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Summer in Santarém

Moon Rise, Set & Phases in the Summer in SantarémJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 84:23 AMMay 84:23 AMMay 232:54 PMMay 232:54 PMJun 61:38 PMJun 61:38 PMJun 222:09 AMJun 222:09 AMJul 511:58 PMJul 511:58 PMJul 2111:18 AMJul 2111:18 AMAug 412:14 PMAug 412:14 PMAug 197:26 PMAug 197:26 PMSep 32:56 AMSep 32:56 AMSep 183:35 AMSep 183:35 AM6:21 AM6:21 AM9:28 PM9:28 PM9:12 PM9:12 PM6:26 AM6:26 AM9:32 PM9:32 PM9:09 PM9:09 PM6:01 AM6:01 AM9:17 PM9:17 PM8:47 PM8:47 PM6:00 AM6:00 AM9:09 PM9:09 PM8:36 PM8:36 PM7:27 AM7:27 AM7:16 AM7:16 AM8:23 PM8:23 PM7:30 PM7:30 PM7:33 AM7:33 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Santarém is gradually increasing during the summer, rising from 1% to 5% over the course of the season.

For reference, on September 24, the muggiest day of the year, there are muggy conditions 5% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Summer in Santarém

Humidity Comfort Levels in the Summer in SantarémJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallJun 11%Jun 11%Aug 315%Aug 315%Jul 12%Jul 12%Aug 14%Aug 14%humidhumidcomfortablecomfortabledrydrymuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Santarém is essentially constant during the summer, remaining within 0.5 miles per hour of 8.9 miles per hour throughout.

For reference, on July 16, the windiest day of the year, the daily average wind speed is 9.5 miles per hour, while on September 16, the calmest day of the year, the daily average wind speed is 7.9 miles per hour.

The highest daily average wind speed during the summer is 9.5 miles per hour on July 16.

Average Wind Speed in the Summer in Santarém

Average Wind Speed in the Summer in SantarémJunJulAug0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphSpringFallJul 169.5 mphJul 169.5 mphJun 18.8 mphJun 18.8 mphAug 318.4 mphAug 318.4 mphJul 19.3 mphJul 19.3 mphAug 19.2 mphAug 19.2 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Santarém throughout the summer is predominantly from the north, with a peak proportion of 67% on July 21.

Wind Direction in the Summer in Santarém

Wind Direction in the Summer in SantarémJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFallNowNowwestnorthsoutheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Santarém is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Santarém is gradually increasing during the summer, rising by 4°F, from 62°F to 66°F, over the course of the season.

The highest average surface water temperature during the summer is 66°F on August 24.

Average Water Temperature in the Summer in Santarém

Average Water Temperature in the Summer in SantarémJunJulAug56°F56°F58°F58°F60°F60°F62°F62°F64°F64°F66°F66°F68°F68°FSpringFallAug 2466°FAug 2466°FJun 162°FJun 162°FJul 164°FJul 164°FAug 166°FAug 166°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Santarém typically lasts for 11 months (331 days), from around January 26 to around December 22, rarely starting after February 29, or ending before November 22.

The summer in Santarém is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Santarém

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Santarémgrowing seasongrowing seasonJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFall100%Jul 17100%Jul 17NowNowcoldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Santarém are very rapidly increasing during the summer, increasing by 2,036°F, from 1,183°F to 3,218°F, over the course of the season.

Growing Degree Days in the Summer in Santarém

Growing Degree Days in the Summer in SantarémJunJulAug1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°FSpringFallJun 11,183°FJun 11,183°FAug 313,218°FAug 313,218°FJul 11,787°FJul 11,787°FAug 12,511°FAug 12,511°FNowNow
The average growing degree days accumulated over the course of the summer, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Santarém is decreasing during the summer, falling by 1.2 kWh, from 7.5 kWh to 6.4 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 8.2 kWh on July 6.

Average Daily Incident Shortwave Solar Energy in the Summer in Santarém

Average Daily Incident Shortwave Solar Energy in the Summer in SantarémJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhSpringFallJul 68.2 kWhJul 68.2 kWhJun 17.5 kWhJun 17.5 kWhAug 316.4 kWhAug 316.4 kWhAug 17.7 kWhAug 17.7 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Santarém are 39.233 deg latitude, -8.683 deg longitude, and 351 ft elevation.

The topography within 2 miles of Santarém contains only modest variations in elevation, with a maximum elevation change of 364 feet and an average elevation above sea level of 112 feet. Within 10 miles contains only modest variations in elevation (551 feet). Within 50 miles contains significant variations in elevation (2,257 feet).

The area within 2 miles of Santarém is covered by cropland (55%) and artificial surfaces (31%), within 10 miles by cropland (75%) and trees (17%), and within 50 miles by trees (39%) and cropland (38%).

This report illustrates the typical weather in Santarém, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Santarém.

For each station, the records are corrected for the elevation difference between that station and Santarém according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Santarém is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Santarém and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Santarém and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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