The climate of Portsmouth
Portsmouth, located in
Virginia, USA, predominantly exhibits a Humid subtropical climate according to the Köppen climate classification. This classification, symbolized as Cfa, implies that Portsmouth experiences no dry season, ensuring humidity remains relatively constant throughout the year. The geographical position of Portsmouth amplifies humid subtropical influences, offering warmer summers and milder winters.
Throughout the year, temperatures in Portsmouth fluctuate from 34.7°F (1.5°C) in the colder months to 86.4°F (30.2°C) during the hotter seasons, making it a region with considerable thermal amplitude. Humidity sees slight variances as well, with recorded levels ranging from 74% to 78%, underscoring the prevalent humidity this region experiences. Rainfall tends to increase as the year progresses, peaking at 2.52" (64mm) in
August with a minimum record of 1.1" (28mm) in
November. Consistent with the subtropical climate, snowfall remains relatively insignificant with only minimal traces being noted in Winter and early Spring.
A peculiar weather pattern Portsmouth exhibits is the steadily increasing daylight hours from a low of 9.7 hours in
December to a high of 14.7 hours by
June, a notable feature characteristic of the northern hemisphere. Alongside this, sunshine duration escalates from 5.5 hours per day in Winter months to 10.9 hours per day in Summer. This directly influences the UV index which surges to 7 during the warmest months relative to a baseline of 2 in the colder months.
The best time to visit Portsmouth
The most pleasant period to visit
Portsmouth falls from
May to
September, when the average temperatures oscillate between a pleasant 64.9°F (18.3°C) to a more tropical 86.4°F (30.2°C). This period also sees the highest sea temperatures, making it ideal for sea-side activities. Additionally, daylight hours are at their maximum during this period providing ample time for outdoor adventures and exploration.
The worst time to visit Portsmouth
The period from
December to
February is the least advisable time to visit
Portsmouth, with average temperatures being the lowest of the year, touching a mere 34.7°F (1.5°C) to 49.1°F (9.5°C). Despite relatively low humidity percentages during these months, increased rainfall coupled with the cold can lead to a rather damp and less hospitable climate.
Spring weather in Portsmouth
Spring in
Portsmouth, from
March to
May, is marked by a considerable rise in temperature, transitioning from 54.5°F (12.5°C) to 73.4°F (23°C). This period also witnesses a significant surge in rainfall from 1.34" (34mm) to 1.89" (48mm). Sea temperatures also rise from 47.2°F (8.4°C) to 61.6°F (16.4°C), signaling the onset of warmer waters.
Summer weather in Portsmouth
The Summer season, from
June to
August, offers the warmest temperatures with averages ranging from 81.9°F (27.7°C) to 86.4°F (30.2°C). These months also bring the most rainfall, with measurements reaching 2.52" (64mm) in August. Sea temperatures rocket to their highest, reaching 72.5°F (22.5°C) to 80°F (26.7°C).
Autumn weather in Portsmouth
Autumn, lasting from
September to
November, facilitates a cooling trend with temperatures falling from 79.2°F (26.2°C) to 58.3°F (14.6°C). Rainfall decreases gradually, falling to 1.1" (28mm) in November, the least amount of rainfall for the entire year.
Winter weather in Portsmouth
Winter in
Portsmouth, from
December to
February, experiences the lowest temperatures, dropping to an average minimum of 34.7°F (1.5°C). Rainfall shows an uptick, with February recording 1.42" (36mm) of precipitation. Despite the chilling atmosphere, snowfall remains insignificant, amounting only to 0.47" (12mm) in December and 0.39" (10mm) in February.
Weather in January
A fresh start to the year in
Portsmouth,
Virginia, features weather conditions emblematic of a coastal winter.
January weather provides cool temperatures with the average high and low of the month standing at 45.9°F (7.7°C) and 34.7°F (1.5°C) respectively.
Weather in January »Weather in February
Transitioning from
January,
Portsmouth continues to experience chilly but slowly warming conditions in
February. Along with a slight rise in temperature, the city encounters a small increase in rainfall, amounting to 1.42" (36mm).
Weather in February »Weather in March
The first month of the spring,
March, is a fresh month in
Portsmouth,
Virginia, with an average temperature ranging between max 54.5°F (12.5°C) and min 42.4°F (5.8°C). With the onset of March, Portsmouth observes a minor temperature ascent, with the average high-temperature adjusting from
February's chilly 49.1°F (9.5°C) to a fresh 54.5°F (12.5°C).
Weather in March »
Weather in April
The blossoming month of
April unfolds full tilt spring weather in
Portsmouth. April is considerably warmer, enabling the flora around the city to bloom after a winter dormancy. However, April remains the cloudiest month with a cloud cover of 36%.
Weather in April »Weather in May
The bright and bountiful month of
May welcomes more consistent warmer temperatures in
Portsmouth. Being the month with the highest humidity, May marks the commencement of the humid period which is characteristic to this coastal city.
Weather in May »Weather in June
With the arrival of
June, summer takes center stage in
Portsmouth. This is the month where you can find an abundance of sunshine, longest daylight hours, and the temperature rise brings warmth to the city. Sea temperature climbs up, allowing residents and tourists to relish the beach to the fullest.
Weather in June »
Weather in July
July's illustrious zenith of the sunny season in
Portsmouth brings forth the year's highest temperatures, averaging 86.4°F (30.2°C) as the high. A notable UV index of 7 indicates the health-aware populace about the intense sun. Picnics, barbecues, and outdoor activities dominate this part of the year.
Weather in July » Weather in August
Portsmouth's coastal summer rolls into
August with all its glory and warmth. Despite a slight drop in peak temperatures, August sustains
July's dynamic summer weather pattern. The slight decrease in humidity, coupled with cooling sea breeze, subtly reveals the imminent approach of fall.
Weather in August » Weather in September
In
Portsmouth,
September serves as a portal from the scorching summer to the mild fall season. A considerable decline in temperature from
August's norm, the highest rainfall of the year at 2.28" (58mm), and longer nights resurrect the calmness and tranquillity of the city.
Weather in September »
Weather in October
October's arrival paints
Portsmouth with hues of fall and brings pleasant weather for outdoor explorations. These weather attributes include less rainfall, moderate daytime temperatures, and crisp evenings reminiscent of a classic fall season.
Weather in October » Weather in November
November adds a crisp chill in the air, initiating the arrival of winter in
Portsmouth. The city welcomes an onset of cooler days with average temperatures starting to mimic the year’s lowest. It exemplifies the classic late autumn climate, with cooler nights demanding heavier jackets.
Weather in November » Weather in December
Concluding the year in
Portsmouth,
December transforms the city into a winter wonderland. Winter's full onset is characterized by a general shift to shorter days and cold nights, with average temperatures dropping to their lowest: 51.4°F (10.8°C) and 40.5°F (4.7°C) respectively.
Weather in December »