Summer Weather in Sanatoga Pennsylvania, United States

Daily high temperatures increase by 4°F, from 77°F to 80°F, rarely falling below 66°F or exceeding 93°F. The highest daily average high temperature is 85°F on July 21.

Daily low temperatures increase by 4°F, from 57°F to 62°F, rarely falling below 48°F or exceeding 73°F. The highest daily average low temperature is 67°F on July 21.

For reference, on July 20, the hottest day of the year, temperatures in Sanatoga typically range from 66°F to 85°F, while on January 30, the coldest day of the year, they range from 23°F to 38°F.

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.

Konya, Turkey (5,388 miles away); Krasnodar, Russia (5,294 miles); and Shnogh, Armenia (5,693 miles) are the far-away foreign places with temperatures most similar to Sanatoga (view comparison).

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The summer in Sanatoga experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 50% to 36%. The lowest chance of overcast or mostly cloudy conditions is 36% on August 29.

The clearest day of the summer is August 29, with clear, mostly clear, or partly cloudy conditions 64% of the time.

For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on August 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sanatoga, the chance of a wet day over the course of the summer is very rapidly decreasing, starting the season at 37% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 38% on June 16, and its lowest chance is 21% on January 29.

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 Sanatoga is essentially constant, remaining about 3.6 inches throughout, and rarely exceeding 6.5 inches or falling below 1.4 inches.

The lowest average 31-day accumulation is 3.4 inches on August 26.

Over the course of the summer in Sanatoga, 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, 45 minutes, implying an average daily decrease of 1 minute, 9 seconds, and weekly decrease of 8 minutes, 3 seconds.

The shortest day of the summer is August 31, with 13 hours, 7 minutes of daylight and the longest day is June 21, with 15 hours, 3 minutes of daylight.

The earliest sunrise of the summer in Sanatoga is 5:32 AM on June 14 and the latest sunrise is 57 minutes later at 6:29 AM on August 31.

The latest sunset is 8:36 PM on June 27 and the earliest sunset is 1 hour, 1 minute earlier at 7:35 PM on August 31.

Daylight saving time is observed in Sanatoga during 2026, but it neither starts nor ends during the summer, so the entire season is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:32 AM and sets 15 hours, 3 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:21 AM and sets 9 hours, 18 minutes later, at 4:39 PM.

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.

The figure below presents a compact representation of key lunar data for the summer of 2026. 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.

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 Sanatoga is rapidly increasing during the summer, rising from 16% to 33% over the course of the season.

The highest chance of a muggy day during the summer is 55% on August 2.

For reference, on August 2, the muggiest day of the year, there are muggy conditions 55% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Sanatoga is gradually decreasing during the summer, decreasing from 4.6 miles per hour to 4.1 miles per hour over the course of the season.

For reference, on February 26, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 3.9 miles per hour.

The lowest daily average wind speed during the summer is 3.9 miles per hour on August 13.

The wind direction in Sanatoga during the summer is predominantly out of the west from June 1 to August 1 and the south from August 1 to August 31.

Sanatoga 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 Sanatoga is very rapidly increasing during the summer, rising by 12°F, from 62°F to 73°F, over the course of the season.

The highest average surface water temperature during the summer is 74°F on August 8.

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 Sanatoga typically lasts for 6.4 months (196 days), from around April 11 to around October 25, rarely starting before March 25 or after April 28, and rarely ending before October 6 or after November 13.

The summer in Sanatoga is reliably fully 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 Sanatoga are very rapidly increasing during the summer, increasing by 2,074°F, from 651°F to 2,725°F, over the course of the season.

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 Sanatoga is gradually decreasing during the summer, falling by 0.9 kWh, from 6.5 kWh to 5.7 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 6.9 kWh on June 29.

For the purposes of this report, the geographical coordinates of Sanatoga are 40.245 deg latitude, -75.595 deg longitude, and 236 ft elevation.

The topography within 2 miles of Sanatoga contains only modest variations in elevation, with a maximum elevation change of 446 feet and an average elevation above sea level of 227 feet. Within 10 miles contains only modest variations in elevation (1,017 feet). Within 50 miles contains very significant variations in elevation (2,080 feet).

The area within 2 miles of Sanatoga is covered by artificial surfaces (58%) and trees (33%), within 10 miles by trees (42%) and cropland (35%), and within 50 miles by cropland (37%) and trees (35%).