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April Weather in Portland Australia

Daily high temperatures decrease by 3°F, from 64°F to 61°F, rarely falling below 56°F or exceeding 74°F.

Daily low temperatures decrease by 2°F, from 55°F to 53°F, rarely falling below 48°F or exceeding 60°F.

For reference, on February 6, the hottest day of the year, temperatures in Portland typically range from 58°F to 68°F, while on July 19, the coldest day of the year, they range from 49°F to 55°F.

Average High and Low Temperature in April in Portland

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 temperatures for the quarter of the year centered on April. 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 April in Portland

Average Hourly Temperature in April in PortlandApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMayNowNowcoldcoldcoolcomfortable
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.

Coquimbo, Chile (7,270 miles away) and Cee, Spain (10,893 miles) are the far-away foreign places with temperatures most similar to Portland (view comparison).

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The month of April in Portland experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 45% to 51%.

The clearest day of the month is April 1, with clear, mostly clear, or partly cloudy conditions 55% of the time.

For reference, on June 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on February 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.

Cloud Cover Categories in April in Portland

Cloud Cover Categories in April in PortlandApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 155%Apr 155%Apr 3049%Apr 3049%Apr 1153%Apr 1153%Apr 2151%Apr 2151%NowNowclearmostly clearpartly cloudymostly cloudyovercast
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 Portland, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 15% and ending it at 25%.

For reference, the year's highest daily chance of a wet day is 40% on August 7, and its lowest chance is 9% on February 11.

Probability of Precipitation in April in Portland

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during April in Portland is gradually increasing, starting the month at 1.3 inches, when it rarely exceeds 2.6 inches or falls below 0.3 inches, and ending the month at 1.7 inches, when it rarely exceeds 3.1 inches or falls below 0.5 inches.

Average Monthly Rainfall in April in Portland

Average Monthly Rainfall in April in PortlandApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 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 inMarMayApr 11.3 inApr 11.3 inApr 301.7 inApr 301.7 inApr 111.4 inApr 111.4 inApr 211.6 inApr 211.6 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 April in Portland, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 7 minutes, implying an average daily decrease of 2 minutes, 18 seconds, and weekly decrease of 16 minutes, 8 seconds.

The shortest day of the month is April 30, with 10 hours, 32 minutes of daylight and the longest day is April 1, with 11 hours, 39 minutes of daylight.

Hours of Daylight and Twilight in April in Portland

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 latest sunrise of the month in Portland is 7:52 AM on April 6 and the earliest sunrise is 59 minutes earlier at 6:53 AM on April 7.

The latest sunset is 7:26 PM on April 1 and the earliest sunset is 1 hour, 40 minutes earlier at 5:46 PM on April 30.

Daylight saving time (DST) starts at 2:00 AM on April 7, 2024, shifting sunrise and sunset to be an hour later.

For reference, on December 21, the longest day of the year, the Sun rises at 6:06 AM and sets 14 hours, 51 minutes later, at 8:57 PM, while on June 20, the shortest day of the year, it rises at 7:50 AM and sets 9 hours, 29 minutes later, at 5:19 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in April in Portland

Sunrise & Sunset with Twilight and Daylight Saving Time in April in PortlandApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMarMay6:53 AM6:53 AMApr 76:17 PMApr 76:17 PM7:14 AM7:14 AMApr 305:46 PMApr 305:46 PMDSTApr 7DSTApr 7SolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of April. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

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 April in Portland

Solar Elevation and Azimuth in April in PortlandApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMay00101020202030304050000101020203030304050NowNow
northeastsouthwest
Solar elevation and azimuth over the course of April 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 April 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 April in Portland

Moon Rise, Set & Phases in April in PortlandApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayMar 108:01 PMMar 108:01 PMMar 256:01 PMMar 256:01 PMApr 94:22 AMApr 94:22 AMApr 249:50 AMApr 249:50 AMMay 81:23 PMMay 81:23 PMMay 2311:54 PMMay 2311:54 PM6:47 AM6:47 AM8:06 PM8:06 PM7:38 PM7:38 PM8:17 AM8:17 AM7:08 AM7:08 AM6:25 PM6:25 PM5:26 PM5:26 PM7:10 AM7:10 AM7:14 AM7:14 AM5:26 PM5:26 PM4:52 PM4:52 PM8:13 AM8:13 AMNowNow
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.
Apr 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
64%-2:34 PMSW11:31 PMSE6:34 AMN239,772 mi
2
50%-3:30 PMSW-7:31 AMN236,526 mi
3
42%12:35 AMSE4:18 PMWSW-8:30 AMN233,140 mi
4
30%1:47 AMESE4:59 PMWSW-9:28 AMN229,833 mi
5
20%3:03 AMESE5:33 PMWSW-10:23 AMN226,886 mi
6
11%4:19 AMESE6:03 PMWSW-11:15 AMN224,600 mi
7
4%4:36 AME5:30 PMW-11:06 AMN223,253 mi
8
1%5:52 AME5:57 PMW-11:56 AMN223,045 mi
9
0%7:08 AME6:25 PMWNW-12:47 PMN224,052 mi
10
3%8:25 AMENE6:57 PMWNW-1:41 PMN226,205 mi
11
8%9:42 AMENE7:33 PMWNW-2:37 PMN229,297 mi
12
16%10:57 AMENE8:16 PMNW-3:36 PMN233,019 mi
13
25%12:06 PMNE9:07 PMNW-4:36 PMN237,013 mi
14
35%1:07 PMNE10:05 PMNW-5:36 PMN240,931 mi
15
46%1:57 PMNE11:07 PMNW-6:32 PMN244,479 mi
16
50%2:38 PMENE--7:24 PMN247,442 mi
17
66%-12:10 AMWNW3:11 PMENE8:12 PMN249,693 mi
18
75%-1:13 AMWNW3:39 PMENE8:56 PMN251,184 mi
19
83%-2:14 AMWNW4:02 PMENE9:37 PMN251,929 mi
20
89%-3:13 AMWNW4:23 PME10:16 PMN251,990 mi
21
95%-4:12 AMW4:44 PME10:55 PMN251,460 mi
22
98%-5:10 AMW5:04 PME11:34 PMN250,443 mi
23
99%-6:09 AMW5:26 PMESE--
24
100%-7:10 AMWSW5:50 PMESE12:14 AMN249,041 mi
25
100%-8:13 AMWSW6:18 PMESE12:57 AMN247,345 mi
26
97%-9:18 AMWSW6:52 PMESE1:44 AMN245,420 mi
27
93%-10:24 AMSW7:34 PMSE2:34 AMN243,314 mi
28
86%-11:28 AMSW8:26 PMSE3:29 AMN241,053 mi
29
78%-12:26 PMSW9:27 PMSE4:26 AMN238,663 mi
30
68%-1:16 PMSW10:36 PMESE5:24 AMN236,177 mi

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 Portland is essentially constant during April, remaining around 0% throughout.

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

Humidity Comfort Levels in April in Portland

Humidity Comfort Levels in April in PortlandApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%MarMayApr 10%Apr 10%Apr 300%Apr 300%Apr 110%Apr 110%Apr 210%Apr 210%humidhumidcomfortablecomfortabledrydry
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 Portland is essentially constant during April, remaining within 0.2 miles per hour of 12.0 miles per hour throughout.

For reference, on August 8, the windiest day of the year, the daily average wind speed is 15.1 miles per hour, while on April 6, the calmest day of the year, the daily average wind speed is 11.8 miles per hour.

The lowest daily average wind speed during April is 11.8 miles per hour on April 7.

Average Wind Speed in April in Portland

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Portland during April is predominantly out of the south from April 1 to April 6 and the west from April 6 to April 30.

Wind Direction in April in Portland

Wind Direction in April in PortlandSWNApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%MarMayNowNowwestsouthnortheast
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).

Portland 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 Portland is essentially constant during April, remaining within 1°F of 61°F throughout.

Average Water Temperature in April in Portland

Average Water Temperature in April in PortlandApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303058°F58°F59°F59°F60°F60°F61°F61°F62°F62°F63°F63°F64°F64°F65°F65°F66°F66°FMarMayApr 162°FApr 162°FApr 3061°FApr 3061°FApr 1161°FApr 1161°FApr 2161°FApr 2161°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).

Temperatures in Portland are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in April in Portland

Time Spent in Various Temperature Bands and the Growing Season in April in PortlandApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMay100%Apr 16100%Apr 16NowNowcoldcoolcomfortable
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 Portland are increasing during April, increasing by 241°F, from 2,083°F to 2,324°F, over the course of the month.

Growing Degree Days in April in Portland

Growing Degree Days in April in PortlandApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930301,900°F1,900°F2,000°F2,000°F2,100°F2,100°F2,200°F2,200°F2,300°F2,300°F2,400°F2,400°F2,500°F2,500°F2,600°F2,600°FMarMayApr 12,083°FApr 12,083°FApr 302,324°FApr 302,324°FApr 112,174°FApr 112,174°FNowNow
The average growing degree days accumulated over the course of April, 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 Portland is decreasing during April, falling by 1.3 kWh, from 4.1 kWh to 2.8 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April in Portland

Average Daily Incident Shortwave Solar Energy in April in PortlandApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhMarMayApr 14.1 kWhApr 14.1 kWhApr 302.8 kWhApr 302.8 kWhApr 113.6 kWhApr 113.6 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 Portland are -38.346 deg latitude, 141.603 deg longitude, and 52 ft elevation.

The topography within 2 miles of Portland contains only modest variations in elevation, with a maximum elevation change of 177 feet and an average elevation above sea level of 50 feet. Within 10 miles contains only modest variations in elevation (551 feet). Within 50 miles contains significant variations in elevation (1,453 feet).

The area within 2 miles of Portland is covered by water (40%), artificial surfaces (28%), trees (16%), and cropland (12%), within 10 miles by water (53%) and cropland (26%), and within 50 miles by water (58%) and cropland (29%).

This report illustrates the typical weather in Portland, 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 Portland.

For each station, the records are corrected for the elevation difference between that station and Portland 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 Portland is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Portland 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 Portland 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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