Climate and monthly weather forecastHyannis, MA
Climate and monthly weather forecast
The climate of Hyannis
The town of Hyannis, Massachusetts, USA, falls under the Cfa Köppen climate classification, signifying a humid subtropical climate without a proclaimed dry season. The coastal town is known for its moderate weather patterns, largely influenced by its proximity to the Atlantic Ocean.Across the climate spectrum, Hyannis experiences significant fluctuations within various climatic variables. The temperature range is quite comprehensive, with average high temperatures reaching a peak at 72.5°F (22.5°C) in August and average low temperatures sinking to 30.4°F (-0.9°C) in January. Humidity levels stay relatively stable, within the 74% to 84% range, with slight increments during warmer months.
With regards to precipitation, rainfall is distributed universally across the year, though peaking in October with an average of 3.7" (94mm). Snowfall occurrence is limited mostly to winter, predominantly in February with an average of 1.93" (49mm). Hyannis receives about 9.2 hours to 15.2 hours of daylight depending on the month, alongside with consistent visibility of around 6 miles throughout the year.
The best time to visit Hyannis
Ideal visiting times largely revolve around a visitor's personal preferences. Nevertheless, the best time to visit Hyannis for warm-weather activities would be from June to early September. During this time span, the average high temperatures range from 63.9°F (17.7°C) to 72.5°F (22.5°C), accompanied by low chances of snowfall. In addition, the average sea temperature ranges from 57.7°F (14.3°C) to 67.5°F (19.7°C), making it an ideal time for coastal activities.The worst time to visit Hyannis
The less favorable time to visit Hyannis is during the colder stretch of the year, specifically from late November to February. During this period, average high temperatures are commonly below 41.5°F (5.3°C), with average lows dropping to around 30°F (-1.1°C). Additionally, the winter months are more prone to snowfall although the occurrence is minimal.Spring weather in Hyannis
Spring weather in Hyannis, which typically spans from March to May, is characterized by increasingly warmer temperatures, with average highs moving up from 41.5°F (5.3°C) to 55.4°F (13°C) and average lows marking a rise from 35.2°F (1.8°C) to 50.9°F (10.5°C). The amount of rainfall in Spring tends to increase from 3.19" (81mm) in March to 3.03" (77mm) in May. This season is also marked by extra daylight hours, with daylight extending from 12 hours in March to 14.5 hours by May.Summer weather in Hyannis
Hyannis experiences a mild summer from June to August with average high temperatures ranging from 63.9°F (17.7°C) to the peak at 72.5°F (22.5°C). During this period, the sea temperature warms up from 57.7°F (14.3°C) to 67.5°F (19.7°C), adding to the pleasantness of beach activities. While the rainfall decreases slightly -- from 2.24" (57mm) to 1.73" (44mm) -- daylight reaches its peak at 15.2 hours in June.Autumn weather in Hyannis
The autumn months in Hyannis, extending from September to November, feature a gradual decrease in temperatures. Average highs recede from 67.3°F (19.6°C) in September to 51.3°F (10.7°C) in November, while average lows fall from 62.8°F (17.1°C) to 45°F (7.2°C). The town receives diverse amounts of rainfall in Autumn, with a significant jump to 3.7" (94mm) in October before falling to 2.52" (64mm) in November.Winter weather in Hyannis
Winter, spanning December to February, witnesses the coldest temperatures in the town. The average high temperatures range from 38.3°F (3.5°C) to 43.7°F (6.5°C), while average lows hover between 30.4°F (-0.9°C) and 36.5°F (2.5°C). Snowfall is most probable during these months, with February seeing the largest average accumulation at 1.93" (49mm). Daylight hours are also at their minimum, with 9.2 hours observed in December.Weather in January
In comparison to last December's weather conditions, January in Hyannis, Massachusetts exhibits similar temperature ranges. Unique to January is the peak in snowfall, reaching a significant 1.42" (36mm). Weather nuances for January include consistently high relative humidity, stable wind speeds and lower daylight hours. Weather in January »Weather in February
February offers a slight advancement towards spring weather patterns, as compared to the preceding month of January. A slight increase in both sea and land temperatures is observed. The most noteworthy characteristic is the boost of snowfall to 1.77" (45mm), exceeding January's level. Weather in February »Weather in March
As Winter gives way to Spring, Hyannis witnesses significant changes in its meteorological conditions in March. The city experiences a perceptible increase in temperatures on land as spring draws near. Interestingly, the sea temperature decreases slightly to 39°F (3.9°C), defying the pattern of rising temperatures elsewhere. Weather in March »Weather in April
Once Hyannis transitions into April, the vestiges of winter completely recede. The movement from winter frost to spring bloom is evident with an absence of snowfall in April. Along with this change, the city sees a decrease in wind speeds, and increase in visibility due to reduced cloud cover. Weather in April »Weather in May
May in Hyannis, Massachusetts heralds the rapid onset of summer, differing substantially from the cooler conditions of April. Sunshine hours see an appreciable enhancement, contributing to higher UV indexes. As the summer nears, the sea temperatures rise to a welcoming 49.2°F (9.6°C), encouraging beach visits and water-based activities. Weather in May »Weather in June
June weather in Hyannis is characterized by a significant escalation in temperatures - both on land and sea. An appreciable shift in climate is observed from the milder conditions of May. Humidity escalates in June, reaching up to 83% relative humidity. Weather in June »Weather in July
As the heart of the summer, July boasts the highest temperatures of the year in Hyannis. The sea temperature reaches its annual peak of 65.8°F (18.8°C), perfectly suited for beach-related activities. An extended duration of sunshine hours ensures a high UV index. Weather in July »Weather in August
August in Hyannis displays a continuation of summer climate, with conditions relatively similar to those of July. Despite a slightly higher land temperature, the sea temperature remains steady at 67.5°F (19.7°C). With a dip in rainfall accompanied by longer sunshine hours, the city's weather maintains summer characteristics. Weather in August »Weather in September
The advent of September in Hyannis indicates a shift from summer to early autumn weather. A modest dip in temperatures on both land and sea signals the change of seasons. However, the sea remains warm enough for various water activities. Weather in September »Weather in October
October in Hyannis, Massachusetts witnesses visible changes as Autumn comes into full swing. A stark difference from the weather conditions of September is the rise in rainfall to 3.7" (94mm), marking it as one of the most precipitation-heavy months of the year. Weather in October »Weather in November
November ushers in a noticeable transition towards winter in Hyannis, especially when compared to October's conditions. Land temperatures continue their descent while the sea temperature decreases to 51.4°F (10.8°C). As fall shifts towards winter, there is a noteworthy reduction in the average number of daylight hours. Weather in November »Weather in December
As the final month, December signals the full onset of winter in Hyannis. The city experiences lower land temperatures and a decrease in sea temperature to 46.1°F (7.8°C). An increase to 3.62" (92mm) of rain makes December one of the wettest months of the year. Weather in December »Updated: Jun 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The coldest period tends to be January, when average temperatures fluctuate between a high of 38.3°F (3.5°C) and a low of 30.4°F (-0.9°C).
In Hyannis, during the entire year, the rain falls for 157.2 days and collects up to 31.77" (807mm) of precipitation.
January through April and December are months with snowfall.
Throughout the year, there are 24.1 snowfall days, and 6.1" (155mm) of snow is accumulated.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
The month with the most snowfall is March, when snow falls for 5.2 days and typically aggregates up to 1.93" (49mm) of snow.
The month with the coldest seawater is March, with an average ocean temperature of 39°F (3.9°C).
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.
May through November are months without snowfall.
June has the longest days of the year, with an average of 15h and 6min of daylight.
With an average relative humidity of 84%, July is the most humid month.
The months with the highest UV index are July and August, with an average maximum UV index of 6.
August, characterized by an average high temperature of 72.5°F (22.5°C) and a low temperature of 68.2°F (20.1°C), is generally the warmest month.
August is the month with the least rainfall. Rain falls for 12.4 days and accumulates 1.73" (44mm) of precipitation.
The month with the warmest seawater is August, with an average ocean temperature of 67.5°F (19.7°C).
With an average of 10.8h of sunshine, August has the most sunshine of the year.
October is the month with the most rainfall. Rain falls for 14.5 days and accumulates 3.7" (94mm) of precipitation.
The least humid month is November, with an average relative humidity of 74%.
The month with the shortest days is December, with an average of 9h and 12min of daylight.
The month with the least sunshine is December, with an average of 4.6h of sunshine.
Average temperature
Hyannis, MA
The warmest month (with the highest average high temperature) is August (72.5°F).
The month with the lowest average high temperature is January (38.3°F).
The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure
Hyannis, MA
- Average pressure in January:
30"Hg - Average pressure in February:
29.98"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Hyannis, MA
- Average wind speed in January:
16.5mph - Average wind speed in February:
16mph - Average wind speed in March:
16.2mph - Average wind speed in April:
14.1mph - Average wind speed in May:
12.2mph - Average wind speed in June:
11.4mph
- Average wind speed in July:
10.7mph - Average wind speed in August:
10.6mph - Average wind speed in September:
12.6mph - Average wind speed in October:
14.5mph - Average wind speed in November:
15.7mph - Average wind speed in December:
16.1mph
The windiest month (with the highest average wind speed) is January (16.5mph).
The calmest month (with the lowest average wind speed) is August (10.6mph).
Average humidity
Hyannis, MA
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is November (74%).
Average rainfall
Hyannis, MA
- Average rainfall in January:
2.87" - Average rainfall in February:
2.68" - Average rainfall in March:
3.19" - Average rainfall in April:
3.03" - Average rainfall in May:
2.2" - Average rainfall in June:
2.24"
- Average rainfall in July:
2.05" - Average rainfall in August:
1.73" - Average rainfall in September:
1.93" - Average rainfall in October:
3.7" - Average rainfall in November:
2.52" - Average rainfall in December:
3.62"
The wettest month (with the highest rainfall) is October (3.7").
The driest month (with the least rainfall) is August (1.73").
Average rainfall days
Hyannis, MA
- Average rainfall days in January:
10.8 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
12.9 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
14.9 days - Average rainfall days in June:
12.9 days
- Average rainfall days in July:
15.1 days - Average rainfall days in August:
12.4 days - Average rainfall days in September:
11.3 days - Average rainfall days in October:
14.5 days - Average rainfall days in November:
12.1 days - Average rainfall days in December:
14.2 days
The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is February (10.3 days).
Average snowfall
Hyannis, MA
The month with the highest snowfall is March (1.93").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days
Hyannis, MA
- Average snowfall days in January:
6.4 days - Average snowfall days in February:
7.1 days - Average snowfall days in March:
5.2 days - Average snowfall days in April:
0.6 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.4 days - Average snowfall days in December:
4.4 days
The month with the highest number of snowfall days is February (7.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature
Hyannis, MA
The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).
Average daylight / Average sunshine
Hyannis, MA
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
4h and 54min - Average sunshine in February:
4h and 42min - Average sunshine in March:
5h and 54min - Average sunshine in April:
8h and 24min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 30min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 48min - Average sunshine in September:
8h and 48min - Average sunshine in October:
6h and 36min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days
Hyannis, MA
- Average sunshine days in January:
12.8 days - Average sunshine days in February:
11.4 days - Average sunshine days in March:
12.5 days - Average sunshine days in April:
12.7 days - Average sunshine days in May:
14.3 days - Average sunshine days in June:
15.1 days
- Average sunshine days in July:
14.9 days - Average sunshine days in August:
17.7 days - Average sunshine days in September:
17.2 days - Average sunshine days in October:
14.6 days - Average sunshine days in November:
15 days - Average sunshine days in December:
12.6 days
The month with the most sunshine days is August (17.7 days).
The month with the least sunshine days is February (11.4 days).
Average UV index
Hyannis, MA
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Hyannis, MA
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility
Hyannis, MA
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).
