Climate and monthly weather forecast
Port Royal, SC

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The climate of Port Royal

Port Royal, in South Carolina, USA, falls within the Cfa region of the Köppen Climate Classification. This positioning entails a humid subtropical climate with no dry season. Evaluating the weather data, a pattern of weather variations becomes apparent throughout the year.

The warmest months are from June to August, with temperatures reaching upwards of 81.1°F (27.3°C) to a scorching high of 89.6°F (32°C). However, the area maintains a steady range of humidity, hovering from 71% to 76% throughout the year. Balanced temperature shifts take place from winter to summer. In the colder months, between December to February, temperatures tend to stay between 44.1°F (6.7°C) to 61.3°F (16.3°C).

Rainfall variance is observable as well. The year opens with relatively low rainfall levels, averaging 0.91" (23mm) in January to a slight increase in March with 1.18" (30mm). Heavier precipitation is experienced between June and August, with average rainfall measures reaching from 2.68" (68mm) to 3.54" (90mm). The end of the year, from October to December, sees the rainfall levels decrease once again to a range of 2.24" (57mm) to 1.02" (26mm).

Notably, the weather parameters indicate zero snowfall days from March to November, with minimal snowfall activity in December and January. Peak daylight hours are enjoyed in the summer months, mainly from May to July, with an astounding 14 hours of daylight.

The Best Time to Visit Port Royal

Ideal periods for visiting Port Royal revolve around the less intense heat. Many find April to May and September to October to be the most comfortable months. During these periods, temperatures maintain a pleasant range of 52.5°F (11.4°C) to 76.6°F (24.8°C). Rainfall is also notably less during these months, allowing visitors to enjoy outdoor activities without interruption. A comfortable level of humidity, combined with generous sunshine hours, makes these months highly agreeable for travelers.

The Worst Time to Visit Port Royal

Potential visitors are often advised to avoid the high-heat of the summer months from June to August. This period witnesses heightened temperatures, crossing the threshold to a scorching 89.6°F (32°C). Besides, these months also show the highest rainfall measures, with averages ranging from 2.68" (68mm) to 3.54" (90mm). The accompanying humidity and potentially limiting outdoor visitation due to precipitation lead many to categorize this period as the less favorable time to visit Port Royal.

Spring Weather in Port Royal

Spring sets its foot in Port Royal with a splendid blend of moderate temperatures, ample sunlight, and manageable rainfall. In these months, temperatures reside between 52.5°F (11.4°C) in March and escalate gently to reach 74.7°F (23.7°C) in May. Daylight hours increase from 12 hours in March to approximately 13.8 hours by May. Rainfall behaves moderately during this season as well, with levels varying from 1.18" (30mm) in March to 1.85" (47mm) by May.

Summer Weather in Port Royal

Summer graces Port Royal with elevated humidity, lengthy daytime, and increased rainfall. The season unveils temperatures escalating from 81.1°F (27.3°C) in June to a searing peak of 89.6°F (32°C) by July. Corresponding daylight hours also peak during this time, reaching up to 14.3 hours. However, the highest average rainfall measurement also surfaces during these months, especially in August with 3.54" (90mm).

Autumn Weather in Port Royal

Autumn brings with it a reprieve from the intense summer heat, with temperatures steadily decreasing from 85.1°F (29.5°C) in September to 66.9°F (19.4°C) in November. The amount of daytime seen reduces as well, bringing down the daylight hours from 12.4 in September to 10.5 by November. Rainfall experiences a remarkable reduction following the summer downpours, dropping from 2.28" (58mm) in September to just 1.02" (26mm) by November.

Winter Weather in Port Royal

Winter in Port Royal presents cooler temperatures and limited rain activity. The month of December marks the onset of winter temperatures, commencing from 61.3°F (16.3°C) and decreasing to 44.1°F (6.7°C) by February. Correspondingly, daylight hours reduce from 10.1 in December to 10.3 by February, indicating shorter days. Rainfall during these months fluctuates, starting with 2.05" (52mm) in December and then dipping to 0.87" (22mm) by February.

Weather in January

January in Port Royal, South Carolina demonstrates a milder onset of winter, with relatively low chill compared to its northern counterparts. Daylight hours, peaking at an average of 10.3 hours, mark a progressive lengthening of days since the winter solstice. Weather in January »

Weather in February

Transitioning from January, the weather in Port Royal sees a slight climb in temperatures in February. An uptick in average humidity from 72% to 74% parallels the rise in temperatures. This slight increment might be unnoticeable, but it firmly announces the onset of South Carolina's humid climate. Weather in February »

Weather in March

As winter draws to an end, March ushers in the first signs of spring in Port Royal. Notably, March sees a significant increase in daylight hours to 12 hours, paving the way for extended outdoor activities. The weather continues to warm up from February, with high and low temperatures averaging 67.1°F (19.5°C) and 52.5°F (11.4°C), respectively. Weather in March »

Weather in April

April is lauded as the pinnacle of Spring in Port Royal, with the city displaying a plethora of blooming flowers and budding trees. Compared to March, April sees a continued increase in temperatures and daylight hours, now stretching to 13 hours. Weather in April »

Weather in May

May sees the weather in Port Royal gradually transitioning towards summer, with a significant increase in temperatures compared to April. This month brings locals and tourists outside to enjoy the warm weather, now characterized by comfortable temperatures between 66.9°F (19.4°C) and 81.1°F (27.3°C). Weather in May »

Weather in June

June marks the onset of summer in Port Royal, with temperatures and daylight hours reaching their annual maximum. Temperature-wise, June experiences an average low of 73.9°F (23.3°C) and a high of 86.9°F (30.5°C), perfect for beach trips and afternoon barbecues. Weather in June »

Weather in July

In July, Port Royal exhibits its peak summer conditions, with temperatures, humidity, and rainfall reaching significant values. The temperature tends to fluctuate between 76.5°F (24.7°C) and 89.6°F (32°C), the hottest in the year. Weather in July »

Weather in August

August weather in Port Royal remains comparable to July, with lingering high temperatures and elevated humidity. The monthly average high temperature is slightly less at 88.9°F (31.6°C), but the lowest average is a tad bit higher at 76.6°F (24.8°C). Weather in August »

Weather in September

September marks the beginning of a gradual transition from summer to fall in Port Royal. The temperatures start to cool down slightly, with averages ranging between 72.5°F (22.5°C) and 85.1°F (29.5°C). Moreover, daylight hours start to shorten, with an average of 12.4 hours per day. Weather in September »

Weather in October

October ushers in autumn in earnest, with temperatures sliding down and rainfall decreasing from September. Lower temperatures range around 63.5°F (17.5°C), and higher temperatures tend to average at 76.6°F (24.8°C). As the month progresses, leaves on trees in Port Royal start to turn vibrant shades of orange and gold. Weather in October »

Weather in November

November is relatively less crowded in Port Royal, making it an excellent time for visitors who prefer tranquility. As it transitions from autumn into winter, the weather becomes significantly cooler as temperatures fall sharply from October to averages between 52.9°F (11.6°C) and 66.9°F (19.4°C). Weather in November »

Weather in December

December is the coolest month of the year in Port Royal, characterized by shorter days with an average of 10.1 hours of daylight. However, it also retains a special charm, as the Christmas season fills the city with holiday cheer. Weather in December »
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Frequently asked questions

What is the coldest month in Port Royal?

The coldest period is January, when temperatures fluctuate between an average high of 57.6°F (14.2°C) and a low of 44.1°F (6.7°C).

How many days does it rain in Port Royal?

In Port Royal, South Carolina, during the entire year, the rain falls for 154.7 days and collects up to 23.11" (587mm) of precipitation.

When does it snow in Port Royal?

Months with snowfall are January, February and December.

When does it snow the most in Port Royal?

January has the most snowfall days of the year in Port Royal, South Carolina. Snow falls for 0.2 days.

How many days does it snow in Port Royal?

In Port Royal, South Carolina, during the entire year, snow falls for 0.4 days.

When is the lowest UV index in Port Royal?

With an average maximum UV index of 3, January is the month with the lowest UV index.

What is the driest month in Port Royal?

The month with the least rainfall is February, when the rain falls for 8.8 days and typically collects 0.87" (22mm) of precipitation.

What is the least humid month in Port Royal?

March is the least humid month in Port Royal, with an average relative humidity of 71%.

When it does not snow in Port Royal?

March through November are months without snowfall.

When is Daylight Saving Time (DST) in Port Royal?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the month with the highest UV index in Port Royal?

The months with the highest UV index in Port Royal, South Carolina, are May through August, with an average maximum UV index of 7.

When are the longest days in Port Royal?

With an average of 14h and 12min of daylight, June has the longest days of the year.

What is the warmest month in Port Royal?

Port Royal's July weather, marked by an average high temperature of 89.6°F (32°C) and an average low temperature of 76.5°F (24.7°C), is the warmest in the year.

What month has the most sunshine in Port Royal?

The month with the most sunshine is July, with an average of 11.2h of sunshine.

What is the rainiest month in Port Royal?

The month with the most rainfall is August, when the rain falls for 21.8 days and typically aggregates up to 3.54" (90mm) of precipitation.

What is the most humid month in Port Royal?

The most humid month in Port Royal is December, with an average relative humidity of 77%.

What is the month with the shortest days in Port Royal?

December has the shortest days of the year in Port Royal, South Carolina, with an average of 10h and 6min of daylight.

What is the month with the least sunshine in Port Royal?

December has the least sunshine of the year, with an average of 5.6h of sunshine.

Average temperature
Port Royal, SC

Average temperature - Port Royal, SC

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (57.6°F).

The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (44.1°F).

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Average pressure
Port Royal, SC

Average pressure - Port Royal, SC

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).

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Average wind speed
Port Royal, SC

Average wind speed - Port Royal, SC

The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

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Average rainfall
Port Royal, SC

Average rainfall - Port Royal, SC

The wettest month (with the highest rainfall) is August (3.54").
The driest month (with the least rainfall) is February (0.87").

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Average rainfall days
Port Royal, SC

Average rainfall days - Port Royal, SC

The month with the highest number of rainy days is August (21.8 days).
The month with the least rainy days is November (6.8 days).

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Average snowfall days
Port Royal, SC

Average snowfall days - Port Royal, SC

The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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Average daylight / Average sunshine
Port Royal, SC

Average daylight / Average sunshine - Port Royal, SC

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

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Average sunshine days
Port Royal, SC

Average sunshine days - Port Royal, SC

The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is August (5.3 days).

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Average visibility
Port Royal, SC

Average visibility - Port Royal, SC

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Port Royal, South Carolina, USA

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