June Weather in Portsmouth, United States

Last updated: February 24, 2025

In June, the weather in Portsmouth, United States showcases a delightful transition into summer. Average temperatures hover around a comfortable 18°C (65°F), with peaks reaching a pleasant 30°C (86°F), while nighttime lows dip to a refreshing 8°C (47°F). Though the month experiences an average of 10 rainy days, accumulating about 88 mm (3.5 in) of precipitation, the overall humidity sits at a moderate 72%, creating a warm, inviting atmosphere. This blend of warm days and cooler evenings makes June an ideal time for both outdoor activities and enjoying the city's charming ambiance.

June Temperature in Portsmouth

In June, Portsmouth enjoys a pleasant transition into summer, marked by a minimum temperature of 8°C (47°F) and a comfortable average of 18°C (65°F). As the month progresses, temperatures climb, reaching a maximum of 30°C (86°F), inviting outdoor activities and making it a perfect time for beach outings. This positive trend continues from the cooler spring months, showcasing a refreshing departure from the lower temperatures of earlier in the year. Overall, June sets the stage for the warmth and vibrancy of summer, encouraging residents and visitors alike to embrace the sun-filled days ahead.

June Weather in Portsmouth: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Portsmouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec303236465565717165554334
Data source: Temperature data for Portsmouth generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

June Precipitation in Portsmouth

In June, Portsmouth experiences a moderate precipitation total of 88 mm (3.5 in), accompanied by rainfall on approximately 10 days throughout the month. This marks a slight uptick from May's 83 mm (3.3 in), indicating that while spring’s showers begin to taper off, they are still prevalent as summer approaches. Notably, June falls between the wetter months of April and July, which see 143 mm (5.6 in) and 123 mm (4.8 in) respectively, suggesting a trend of increasing precipitation leading into the height of summer. Despite the vibrant greenery that June's rains foster, the relative consistency of rainfall days indicates a transition toward drier conditions as the summer progresses, with August appearing notably drier at just 71 mm (2.8 in).

June Precipitation Trends in Portsmouth

The chart displays monthly precipitation patterns in Portsmouth, with values for each month alongside June's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec79989414383881237178143108133
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

June Humidity in Portsmouth

In June, Portsmouth experiences a marked shift in humidity, maintaining a relatively comfortable 72%, which is consistent with May's levels. This drop follows a gradual decrease from 80% in April, suggesting a transition into the warmer months where humidity begins to stabilize. As the summer progresses into July and August, the humidity continues to decline, reaching its lowest point at 67% and 66%, respectively. This trend highlights the city's shift from the high moisture of winter months—starting at 86% in January—to a milder summer, making June a pleasant month for outdoor activities before the peak heat sets in.

June Average Humidity in Portsmouth

This chart illustrates the average monthly humidity levels in Portsmouth, with June's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how June's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Portsmouth

As summer approaches in Portsmouth, the UV Index peaks dramatically in June, reaching 10, which places it in the very high exposure category with a burn time of just 15 minutes. This marks a significant rise from the 9 recorded in May and coincides with a pattern of increasing UV levels from the moderate indices in January through April. The trend emphasizes the importance of sun safety as temperatures rise, where prolonged exposure can lead to skin damage in a short span. With July and August also maintaining a high UV Index of 9, residents and visitors alike should take precautions to protect their skin. For more detailed information on the UV Index throughout the year, check out Portsmouth UV Index.

Maximum UV Index Levels in Portsmouth for June

The chart shows the monthly maximum UV Index (UVI) for Portsmouth in June, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Portsmouth June UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

June Sunshine in Portsmouth

As June rolls in, Portsmouth basks in its sunniest glory, boasting an impressive 330 hours of sunshine. This marks a delightful increase from May's 295 hours, highlighting the transition into summer with a steady climb in daylight hours. Following the trend from earlier months, where sunshine gradually ascended from 150 hours in January to a peak in June, Portsmouth enjoys its brightest stretch of the year. July and August continue this sunny trajectory, reaching an apex with 335 and 337 hours respectively, before a gradual tapering into the autumn months. This upward trend not only illustrates the vibrant mid-year brightness but also emphasizes Portsmouth's charm as a perfect summer destination.

Monthly Sunshine Duration in Portsmouth: June Highlighted

The June sunshine duration represents the total number of hours Portsmouth experiences direct sunlight during the month of June, excluding cloudy or obstructed periods. This chart compares the sunshine duration of June with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec150h183h256h245h295h330h335h337h285h221h193h176h
Data source: Portsmouth June Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Portsmouth During June

In June, Portsmouth experiences a 40% chance of sunny weather, continuing a general trend of fluctuating sunshine throughout the year. While this figure is an improvement compared to the gloomy winter months, it mirrors the slightly diminished expectations seen in May. Historically, spring serves up a mix of brighter days, particularly in March with a 61% chance of sun, which then tapers as summer approaches. Interestingly, the likelihood of clear skies plummets in the peak summer months of July and August, where sunshine dips to 32%. Overall, June represents a transitional period, balancing warmer weather with a persistent potential for overcast skies.

Percentage of Sunny Days in June in Portsmouth

The chart illustrates the percentage of sunny days in Portsmouth throughout the year, with June highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Portsmouth experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec42%35%61%40%38%40%32%32%44%38%54%32%
Data source: Portsmouth June chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Portsmouth in June

As June arrives in Portsmouth, daylight reaches its peak with a whopping 15 hours of sunshine each day. This marks a significant increase from earlier months, reflecting a steady climb in daylight that begins in January with just 9 hours. The gradual expansion of daylight from 10 hours in February to 14 hours in May sets the stage for summer's brilliance. Following June, daylight begins to wane, dipping to 14 hours in July and gradually decreasing further into the autumn months. This seasonal rhythm not only heralds the warmth of summer but also invites longer evenings filled with outdoor activities, making June a vibrant highlight in Portsmouth's yearly cycle of light.

Average Daylight Hours in Portsmouth for June

The chart illustrates the variation in daylight duration in Portsmouth throughout the year, with June highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 23m10h 31m11h 57m13h 26m14h 40m15h 18m14h 57m13h 51m12h 26m10h 58m9h 41m9h 2m
Data source: Portsmouth daylight hours, calculated by summing the hours between sunrise and sunset for each day.

June Winds in Portsmouth

In June, Portsmouth experiences a gentle breeze, with an average wind speed of 4.1 m/s (9 mph), which is slightly lower than the spring months. This decline continues from May's average of 4.2 m/s (9 mph), signaling a trend of diminishing wind as summer approaches. While March stands out as the month with a brisker average of 5.2 m/s (12 mph), the shifting dynamics into the hotter months suggest a comfort in the air that complements the city's vibrant waterfront activities. As the summer progresses, a noticeable softening of the winds to 3.5 m/s (8 mph) in July and 3.3 m/s (7 mph) in August further enhances the laid-back coastal atmosphere, inviting residents and visitors alike to relax and embrace the joys of the season.

Average June Wind Speed in Portsmouth

The chart displays monthly wind speed patterns in Portsmouth, with values for each month shown alongside June's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how June's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.74.75.24.44.24.1 m/s3.53.33.94.44.64.6
Data source: Portsmouth June wind data, generated using information from the Copernicus Climate Change Service.

How June Weather in Portsmouth Compares to Other Months

The weather in Portsmouth changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of June's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Portsmouth and find detailed weather information for every month.

In comparing the weather between June and January, we see a dramatic contrast in temperatures and conditions. June boasts a mild range with minimum temperatures around 8°C (47°F) and maximums reaching up to 30°C (86°F), accompanied by an average of 18°C (65°F) and higher humidity at 72%. Precipitation occurs over approximately 10 days, totaling 88 mm (3.5 in). In stark contrast, January features much colder conditions, with minimum temperatures plummeting to -19°C (-2°F) and maximums only reaching 17°C (64°F), leading to an average of -1°C (30°F). The month sees slightly less precipitation at 79 mm (3.1 in), spread over about 8 days, and has a higher humidity level of 86%. For more details on January weather in Portsmouth, you can check Portsmouth weather in January.

The weather in June and February presents a striking contrast. June enjoys milder temperatures, ranging from a minimum of 8°C (47°F) to a maximum of 30°C (86°F), with an average of 18°C (65°F) and a humidity level of 72%. In contrast, February experiences much colder temperatures, with a minimum of -16°C (4°F) and an average of 0°C (32°F), peaking at 17°C (64°F) while humidity is higher at 84%. Additionally, both months have similar levels of precipitation, with June receiving 88 mm (3.5 in) over 10 days compared to February's 98 mm (3.9 in) across 11 days. For a more detailed look at February's weather patterns, you can check Portsmouth weather in February.

When comparing the weather in June and March, there are notable differences in temperature and overall conditions. June sees a much warmer temperature range, with minimums around 8°C (47°F) and maximums reaching up to 30°C (86°F), while March is chilly, with minimums plummeting to -14°C (8°F) and a maximum of 17°C (63°F). Despite both months experiencing around 10 days of precipitation, March has slightly more at 94 mm (3.7 in) compared to June's 88 mm (3.5 in). Additionally, humidity levels are higher in March at 82%, compared to June's 72%. For more details about March weather, check out Portsmouth weather in March.

When comparing the weather in June and April, notable differences emerge in temperature and precipitation patterns. June boasts a milder climate, with average temperatures ranging from a cool 8°C (47°F) to a warm max of 30°C (86°F), while April experiences a broader range, with minimum temperatures dipping to -2°C (29°F) and a maximum of 24°C (76°F). In terms of precipitation, April is the wetter month, receiving 143 mm (5.6 in) over about 13 days, compared to June's 88 mm (3.5 in) spread over 10 days. Humidity remains relatively high in both months, with April slightly more humid at 80% versus June's 72%. For a closer look at the specifics of April weather, you can visit Portsmouth weather in April.

In comparing the weather of May and June, June generally offers warmer temperatures, with a minimum of 8°C (47°F) and an average of 18°C (65°F), unlike May, which has a minimum of 2°C (37°F) and averages just 13°C (55°F). While both months see similar humidity levels at 72%, June experiences slightly higher precipitation totals at 88 mm (3.5 in) over 10 days, compared to May's 83 mm (3.3 in) over 11 days. Overall, June presents a warmer and slightly wetter climate while still retaining the characteristic humidity of spring. For a closer look at the specifics of May weather, check out Portsmouth weather in May.

In comparing the weather of June and July, June experiences a cooler temperature range with a minimum of 8°C (47°F) and an average of 18°C (65°F), while July is warmer, starting from a minimum of 13°C (56°F) and averaging 22°C (71°F). Both months see relatively similar maximum temperatures, with July slightly edging out at 31°C (88°F) compared to June's 30°C (86°F). Precipitation is more pronounced in July, with 123 mm (4.8 in) over 12 days, while June has 88 mm (3.5 in) over 10 days. Humidity is moderately lower in July at 67%, compared to June's 72%. For more detailed insights, check out Portsmouth weather in July.

June and August weather exhibit some notable contrasts. In June, temperatures range from a minimum of 8°C (47°F) to a maximum of 30°C (86°F), with an average of 18°C (65°F) and a higher precipitation total of 88 mm (3.5 in) over 10 days, accompanied by a humidity level of 72%. In comparison, August sees warmer temperatures, with minimums at 13°C (55°F) and maximums reaching 31°C (88°F), averaging at 22°C (71°F). The month experiences less precipitation at 71 mm (2.8 in) over 9 days, along with slightly lower humidity at 66%. For more detailed insights into the weather conditions, check out Portsmouth weather in August.

June and September share similar average temperatures, with both months hovering around 18°C (65°F). However, June tends to experience slightly warmer nights with a minimum temperature of 8°C (47°F) compared to September's 7°C (46°F). While both months can reach a high of 30°C (86°F), June is characterized by more precipitation, averaging 88 mm (3.5 in) over approximately 10 days, compared to September's 78 mm (3.1 in) over just 8 days. The humidity remains relatively consistent, with June at 72% and September slightly lower at 71%. For a more detailed look at September weather, check out Portsmouth weather in September.

June and October present contrasting weather patterns, both in temperature and precipitation. In June, temperatures range from a cool 8°C (47°F) at night to a warm 30°C (86°F) during the day, with an average around 18°C (65°F). This month experiences 88 mm (3.5 in) of rainfall over about 10 days, accompanied by a humidity level of 72%. Conversely, October sees cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 25°C (78°F), averaging at 13°C (56°F). This month is wetter, with 142 mm (5.6 in) of precipitation over 11 days, and a slightly higher humidity of 78%. For more details on October's weather, check out Portsmouth weather in October.

June and November present stark contrasts in weather, reflecting the transition from summer to late autumn. In June, temperatures range from a mild 8°C (47°F) to a warm 30°C (86°F), with an average temperature of 18°C (65°F). The month experiences about 88 mm of precipitation over 10 days, accompanied by a moderate humidity level of 72%. In comparison, November sees much colder conditions, with temperatures dipping as low as -12°C (11°F) and averaging around 6°C (43°F). The maximum temperature reaches 20°C (69°F), while precipitation increases slightly to 108 mm over 11 days, and humidity rises to 84%. For more details, check out Portsmouth weather in November.

June and December present stark contrasts in weather. June typically boasts a mild climate with average temperatures around 18°C (65°F), peaking at a comfortable 30°C (86°F), while December experiences much harsher conditions, with average temperatures plummeting to just 1°C (34°F) and lows reaching as far down as -19°C (-1°F). While June has a moderate precipitation level of 88 mm (3.5 in) over 10 days, December's precipitation is slightly higher at 133 mm (5.2 in) within the same timeframe, often falling as snow. Additionally, humidity levels are considerable in both months, with December being marginally higher at 81% compared to June's 72%. For more detailed information, you can check Portsmouth weather in December.

Compare Portsmouth's Climate with Cities Worldwide

Conclusion: What to Expect From June Weather in Portsmouth

As June arrives in Portsmouth, the weather begins to shift vividly, embracing warmer temperatures that make outdoor activities all the more inviting. With a pleasant average temperature around 18°C (65°F), this month stands out from the cooler spring months, offering the chance to bask in the sun's warmth. While precipitation remains a consideration, with around 88 mm over about 10 days, the balance of moderate humidity at 72% contributes to a refreshing atmosphere perfect for exploring the area's natural beauty. This transition into summer not only brings longer days but also an invigorating spirit, making June a delightful time to experience everything Portsmouth has to offer. For a deeper dive into local weather patterns, check out Portsmouth Climate.