May Weather in Hyannis, United States

Last updated: February 24, 2025

May in Hyannis, United States brings a delightful transition into warmer weather, with temperatures ranging from a maximum of 21°C (70°F) to a minimum of 5°C (41°F). The average temperature settles at 12°C (53°F), offering a comfortable climate for outdoor activities. However, visitors should be prepared for some rain, as the month experiences 119 mm (4.7 inches) of precipitation over 12 days, contributing to a humidity level of 75%. This mix of pleasant warmth and occasional showers paints a picturesque springtime landscape, ideal for exploring the beauty of Cape Cod.

May Temperature in Hyannis

As May arrives in Hyannis, the chill of winter gives way to more inviting temperatures, making it a delightful transition into spring. The month begins with a minimum of 5°C (41°F), gradually warming up to a pleasant 21°C (70°F) at its peak. With an average temperature of 12°C (53°F), May offers a significant jump from the cooler months, showcasing an inviting climate for outdoor activities and exploration. This upward trend in temperatures is a clear indication of the season's shift, as Hyannis shakes off the remnants of winter and prepares for the warmth of summer. The gradual rise from the previous months' averages creates an ambiance that encourages both locals and visitors to savor the emerging beauty of the season.

May Weather in Hyannis: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Hyannis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec353638455363707266594839
Data source: Temperature data for Hyannis generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Hyannis

In Hyannis, May brings a moderate precipitation total of 119 mm (4.7 in), making it a key month in the spring rainfall pattern. Rain falls on an average of 12 days, hinting at the transition from the wetter spring months to the drier summer period. This amount is slightly less than the 137 mm (5.4 in) recorded in April but consistent with the overall downward trend in precipitation observed as the year progresses. As May wraps up, residents and visitors can expect a lively landscape, nurtured by the showers of early spring while preparing for the drier days of summer ahead.

May Precipitation Trends in Hyannis

The chart displays monthly precipitation patterns in Hyannis, with values for each month alongside May's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec94123118137119918382118175102136
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Hyannis

As May arrives in Hyannis, the humidity begins to show a gradual decline, dropping to 75%, a slight improvement from the higher levels seen in the earlier months. This trend of decreasing humidity is a welcoming shift after the winter months, where January and February remain consistently high at 84%. By April, residents can already feel a hint of relief with 79% humidity, signaling that spring is in full swing. The transition into summer sees humidity levels hovering around the mid-70s, with June rising slightly to 78%. Overall, May's humidity provides a comfortable atmosphere that enhances the charm of this coastal paradise, making it an ideal time for outdoor activities.

May Average Humidity in Hyannis

This chart illustrates the average monthly humidity levels in Hyannis, with May's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how May's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Hyannis

In May, Hyannis experiences a significant climb in the UV Index, reaching 9, which falls into the very high exposure category. With a burn time of just 15 minutes, it's crucial to prioritize sun safety and apply sunscreen regularly. This upward trend from earlier months underscores the increasing intensity of UV rays as spring transitions into summer. Compared to April's UV Index of 8, the heightened levels in May signal that outdoor enthusiasts should take extra precautions. As the months progress, the UV Index remains consistently high through June and July, emphasizing the need for vigilance against UV exposure. For more insights on UV levels year-round, visit Hyannis UV Index.

Maximum UV Index Levels in Hyannis for May

The chart shows the monthly maximum UV Index (UVI) for Hyannis in May, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998642
Data source: Hyannis May 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.

May Sunshine in Hyannis

As spring transitions into summer, May shines brightly in Hyannis, offering 298 hours of glorious sunshine that tantalizes locals and visitors alike. This vibrant month not only continues the upward trend established in April but also sets the stage for even sunnier days ahead, with June boasting a remarkable 326 hours. Compared to the dreary winter months, where sunshine dips as low as 142 hours in January, May is a joyous explosion of warmth and light. By this time of year, the days are noticeably longer, making outdoor activities more enticing and paving the way for a memorable summer experience in this coastal haven. Such an increase in sunshine not only lifts spirits but also invites exploration, leisure, and the quintessential enjoyment of Hyannis's beautiful landscapes.

Monthly Sunshine Duration in Hyannis: May Highlighted

The May sunshine duration represents the total number of hours Hyannis experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec142h184h258h243h298h326h346h330h280h236h203h165h
Data source: Hyannis May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Hyannis During May

In Hyannis, the likelihood of sunny weather in May stands at 41%, a figure that aligns closely with the 43% chance noted in April and reflects a slight dip as summer approaches. This month ultimately follows a promising March, where the chance of sun peaked at 57%, suggesting the tail end of spring often brings more variability. As temperatures rise into June, the chance of sunshine slightly decreases to 38%, creating a pattern where the early months of the year generally offer lower probabilities of sun compared to the transitional spring period. Overall, while May may not boast the highest rates of sun, it remains a steady and pleasant month for outdoor activities in Hyannis.

Percentage of Sunny Days in May in Hyannis

The chart illustrates the percentage of sunny days in Hyannis throughout the year, with May 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 Hyannis experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec36%28%57%43%41%38%37%35%49%44%52%28%
Data source: Hyannis May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Hyannis in May

As May unfolds in Hyannis, the length of daylight begins to peak, with 14 hours of sunlight enriching the days. This month marks a significant transition, as the sun rises earlier and sets later compared to the preceding months. Starting from a modest 9 hours in January, daylight gradually increases, revealing a consistent upward trend through February, March, and April. May's generous sunlight not only enhances outdoor activities but also hints at the approaching summer, where the longest days of June follow with 15 hours of daylight. Interestingly, after May, the gradual decline begins, with daylight decreasing throughout the summer and into autumn. Overall, May serves as a vibrant highlight in Hyannis' daylight journey, balancing the long winter nights with a radiant promise of summer.

Average Daylight Hours in Hyannis for May

The chart illustrates the variation in daylight duration in Hyannis throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 31m10h 36m11h 58m13h 22m14h 33m15h 8m14h 49m13h 45m12h 25m11h 1m9h 48m9h 11m
Data source: Hyannis daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Hyannis

In Hyannis, May ushers in a gentle breeze, with an average wind speed of 5.9 m/s (approximately 13 mph), marking a noticeable decrease from the brisk winds of earlier months. After experiencing stronger gusts throughout the winter and early spring, May offers a transition to milder conditions, setting the stage for the upcoming summer. The trend reveals a gradual decline in wind speed as the year progresses, with July and August being the calmest months on record. However, as September rolls in, the winds pick up again, hinting at the seasonal shifts that characterize life on the coast. Overall, May's moderate breezes are a refreshing change, inviting both relaxation and revitalization amid the promise of summer’s arrival.

Average May Wind Speed in Hyannis

The chart displays monthly wind speed patterns in Hyannis, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec7.17.27.06.55.9 m/s6.25.24.85.96.66.76.6
Data source: Hyannis May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Hyannis Compares to Other Months

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

May and January present starkly contrasting weather conditions. In May, temperatures range from a minimum of 5°C (41°F) to a maximum of 21°C (70°F), with an average of 12°C (53°F), making it a much warmer month overall. However, May experiences higher precipitation with 119 mm (4.7 in) over approximately 12 days, coupled with a humidity level of 75%. In contrast, January is significantly colder, with temperatures varying from a deep minimum of -14°C (6°F) to a maximum of 13°C (55°F) and an average of just 2°C (36°F). While January has less rainfall at 94 mm (3.7 in) over 10 days, the humidity is higher at 84%. For more detailed information, you can check Hyannis weather in January.

When comparing the weather in May and February, it’s clear that May offers much milder temperatures, with minimums around 5°C (41°F) and maximums reaching 21°C (70°F), in contrast to February's chillier conditions, where temperatures can drop to as low as -12°C (10°F). While both months see a similar amount of precipitation, with February slightly higher at 123 mm (4.8 in) compared to May's 119 mm (4.7 in), the humidity in February is notably higher at 84%, making it feel even colder than the stated averages. For a closer look at February weather specifics in Hyannis, you can check Hyannis weather in February. Overall, May presents a much more pleasant climate, ideal for outdoor activities, while February’s weather remains brisk and damp.

In comparing the weather of May and March, it's clear that May experiences significantly milder temperatures, with minimums around 5°C (41°F) and maximums reaching up to 21°C (70°F), compared to March's chilly range of -9°C (16°F) to 13°C (56°F). While both months see similar precipitation levels—119 mm (4.7 in) in May and 118 mm (4.7 in) in March—March has a slightly lower number of rainy days, totaling 10 compared to May's 12. Additionally, March tends to have higher humidity at 82%, which can contribute to a colder and more biting feel, whereas May's humidity is a bit lower at 75%, making the warmer temperatures feel more comfortable. For more detailed insights into March weather specifically, you can check out Hyannis weather in March.

In comparing the weather between April and May, May generally offers warmer temperatures, with an average of 12°C (53°F) compared to April's average of just 7°C (46°F). The maximum temperatures also reflect this trend, reaching up to 21°C (70°F) in May while only peaking at 16°C (60°F) in April. However, May does see slightly more precipitation, totaling 119 mm (4.7 in) over 12 days, compared to April's 137 mm (5.4 in) over 13 days. Humidity levels are relatively close, with May at 75% and April at 79%. For a closer look at the weather specifics for April, you can refer to Hyannis weather in April.

May typically features cooler temperatures, with a minimum of 5°C (41°F) and an average of 12°C (53°F), while June sees a notable increase, boasting a minimum of 10°C (51°F) and an average of 17°C (63°F). The maximum temperatures also rise, reaching 21°C (70°F) in May compared to 24°C (76°F) in June. Although May experiences more precipitation, totaling 119 mm (4.7 in) over 12 days, June has less rain at 91 mm (3.6 in) across 10 days. Additionally, humidity levels are slightly higher in June at 78% compared to May's 75%, indicating a more humid atmosphere as summer approaches. For more detailed conditions, visit Hyannis weather in June.

In comparing the weather between May and July, it's clear that July is significantly warmer, with average temperatures rising from 12°C (53°F) in May to 21°C (71°F) in July. The maximum temperature in July reaches a pleasant 29°C (84°F), compared to May's peak of 21°C (70°F). Precipitation decreases in July to 83mm (3.3 in) over just 9 days, while May sees a wetter pattern with 119mm (4.7 in) across 12 days. Humidity remains fairly consistent, slightly rising from 75% in May to 76% in July. For more detailed insights, you can check Hyannis weather in July.

May and August present quite distinct weather profiles. In May, temperatures range from a chilly minimum of 5°C (41°F) to a pleasant maximum of 21°C (70°F), with an average of 12°C (53°F). The month experiences significant rainfall, totaling 119 mm (4.7 in) across 12 days, coupled with a humidity level of 75%. In contrast, August warms up considerably, featuring a minimum temperature of 16°C (61°F) and peaking at 27°C (81°F), with an average of 22°C (72°F). Rainfall in August is lighter at 82 mm (3.2 in) over just 8 days, while humidity remains similar at 76%. For more details, you can check Hyannis weather in August.

May and September present contrasting seasonal climates, each characterized by unique temperatures and weather conditions. In May, temperatures range from a minimum of 5°C (41°F) to a maximum of 21°C (70°F), with an average of 12°C (53°F). The month experiences about 119 mm (4.7 in) of precipitation over 12 days, alongside a humidity level of 75%. In contrast, September is warmer, with temperatures averaging between a minimum of 13°C (56°F) and a maximum of 25°C (78°F), resulting in an average of 19°C (67°F). Although September features slightly less precipitation at 118 mm (4.7 in) across just 10 days, humidity remains consistent at 75%. For more detailed information, you can refer to Hyannis weather in September.

May and October present mild temperatures, with average highs reaching 21°C (70°F) in May and slightly higher at 22°C (72°F) in October. However, October tends to be wetter, receiving approximately 175 mm (6.9 in) of precipitation compared to May's 119 mm (4.7 in) over the same number of days (12). Humidity levels remain consistent at 75% for both months, contributing to a similar feel in the air. For more specific details about October weather in Hyannis, check out Hyannis weather in October.

May and November exhibit notable differences in weather patterns. In May, temperatures range from a mild minimum of 5°C (41°F) to a pleasant maximum of 21°C (70°F), with an average of 12°C (53°F). The month experiences around 119 mm (4.7 in) of precipitation over 12 days, accompanied by a humidity level of 75%. In contrast, November sees cooler temperatures, with a minimum of -6°C (21°F) and a maximum of 19°C (66°F), averaging 9°C (48°F). Although November has slightly less precipitation at 102 mm (4.0 in) over 10 days, the humidity rises to 80%. For more details on November's weather, you can visit Hyannis weather in November.

May and December present contrasting weather conditions. In May, temperatures range from a minimum of 5°C (41°F) to a pleasant average of 12°C (53°F), peaking at 21°C (70°F). This month is characterized by significant rainfall, totaling 119 mm (4.7 in) over about 12 days, with humidity around 75%. In stark contrast, December offers a cooler climate, with temperatures dipping to a minimum of -12°C (11°F) and averaging just 4°C (40°F), while reaching a maximum of 15°C (60°F). Precipitation in December is slightly higher at 136 mm (5.4 in), also over 12 days, but the humidity increases to 80%. For more detailed insights on December weather, you can visit Hyannis weather in December.

Compare Hyannis's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Hyannis

As May ushers in the warmth of spring in Hyannis, it stands out from the chillier months preceding it. With average temperatures climbing to a pleasant 12°C (53°F), the town experiences a refreshing shift that attracts both locals and visitors alike. Although precipitation remains notable, with around 12 days of rain, the overall atmosphere is lively and vibrant. The humidity level at 75% adds a touch of tropical feel, making the air feel fresh yet slightly damp. For those looking to enjoy Hyannis' beauty, May serves as a lovely transition month, setting the stage for the summer to come. Discover more about what to expect throughout the year at Hyannis Climate.