May Weather in Sanibel, United States

Last updated: February 24, 2025

In May, Sanibel experiences a delightful warm climate, with maximum temperatures reaching around 32°C (90°F) and an average of 26°C (79°F), providing ideal conditions for outdoor exploration. Early mornings cool down to a pleasant 18°C (65°F), perfect for a refreshing start to the day. The month sees a total precipitation of 122 mm (4.8 in) spread across 12 days, adding a lush vibrancy to the landscape. With humidity levels averaging 65%, visitors can enjoy the lush, tropical ambiance that May brings to this beautiful destination.

May Temperature in Sanibel

In May, Sanibel begins to bask in the warmth of late spring, showcasing a delightful range of temperatures that beckon outdoor enthusiasts. With minimums rising to 18°C (65°F), the air feels pleasantly mild, while average temperatures reach a comfortable 26°C (79°F). The maximum highs of 32°C (90°F) signal the approach of summer, encouraging beachgoers and nature lovers alike to explore the island's stunning landscapes. Compared to the cooler months preceding it, May marks a significant shift towards warmth, setting the stage for sun-soaked adventures by the Gulf, amidst blooming flora and vibrant wildlife. The combination of warm days and inviting evenings makes this month a perfect time to experience all that Sanibel has to offer.

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

The chart illustrates May temperature patterns in Sanibel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec656971757981828282807368
Data source: Temperature data for Sanibel 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 Sanibel

In May, Sanibel experiences a significant increase in precipitation, with total rainfall reaching 122 mm (4.8 in) over 12 days, marking a pronounced shift from the drier months preceding it. This surge in rain paves the way for lush landscapes, as the island transitions into the wetter summer season. Compared to only 42 mm (1.7 in) in April, May's rainfall not only supports the rich biodiversity but also signals the onset of a typical Floridian pattern, where the atmospherics become more active, leading into the rainy months of June and July. As the weather warms, these cycles of rainfall highlight a sustained trend of increasing precipitation, hinting at the vibrant pulse of nature that thrives in the humid subtropical climate.

May Precipitation Trends in Sanibel

The chart displays monthly precipitation patterns in Sanibel, 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.
JanFebMarAprMayJunJulAugSepOctNovDec36362242122170195206170774452
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Sanibel

As May unfolds in Sanibel, the humidity begins to dip, settling at a comfortable 65%. This marks a significant decline from the winter months when humidity levels hovered around 83%. While summer approaches, a trend emerges where humidity levels start to gradually rise again in June, hitting 73%, and continue to climb through the peak months of July and August. The transition in May offers a brief respite before the sticky summer heat returns, making it an ideal time for outdoor activities and enjoying the island's natural beauty without the overwhelming moisture that characterizes much of the rest of the year.

May Average Humidity in Sanibel

This chart illustrates the average monthly humidity levels in Sanibel, 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.
JanFebMarAprMayJunJulAugSepOctNovDec83%80%75%68%65%73%77%80%83%83%83%84%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Sanibel

In May, Sanibel’s UV Index reaches a significant peak of 12, marking it as an extreme exposure month with a brisk burn time of just 10 minutes. This trend of escalating UV exposure can be traced back through the months, starting from a high index of 6 in January, steadily rising to a very high index of 9 in February and 10 in March, before hitting 12 in both April and May. Following May, the UV Index remains consistent at 12 through the summer months, suggesting a pattern where sun protection becomes increasingly critical as the year progresses. With the potential for rapid skin damage, it's essential to stay informed and take precautions during this time. For more insights on UV levels, check out Sanibel UV Index.

Maximum UV Index Levels in Sanibel for May

The chart shows the monthly maximum UV Index (UVI) for Sanibel 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.
JanFebMarAprMayJunJulAugSepOctNovDec69101212121212111086
Data source: Sanibel 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 Sanibel

May in Sanibel, United States, welcomes a delightful burst of sunshine, boasting an impressive 329 hours of bright daylight. This reflects a steady upsurge in sunshine hours as spring unfolds, peaking just ahead of the summer months. Following April's generous 325 hours, May continues the trend of increasing sunlight, setting the stage for the warm summer days ahead. This month consistently leads into July, which enjoys the highest sunshine tally at 332 hours, while still feeling the warmth of late spring. As the days grow longer and the weather warms, May becomes a perfect time for outdoor activities, capturing the essence of Sanibel’s radiant allure.

Monthly Sunshine Duration in Sanibel: May Highlighted

The May sunshine duration represents the total number of hours Sanibel 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.
JanFebMarAprMayJunJulAugSepOctNovDec225h277h328h325h329h303h332h326h313h301h276h288h
Data source: Sanibel May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Sanibel During May

When considering the likelihood of sunny weather in May in Sanibel, it's interesting to note the patterns throughout the year. While May enjoys a respectable 56% chance of sunshine, it's a dip from the peak of 65% in April, suggesting a slight transition into the rainy season that follows. Comparatively, the months preceding May tend to bask in more sun, with February at 61% and March at 59%. This gradual decline gives way to the significantly lower percentages experienced in summer, where June, July, and August drop to around 19%-21%. Thus, May serves as a bridge, offering a balance between the spring's brighter days and the humid, storm-prone summer ahead, making it a delightful time for those seeking sun in Sanibel.

Percentage of Sunny Days in May in Sanibel

The chart illustrates the percentage of sunny days in Sanibel 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 Sanibel experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%61%59%65%56%19%21%18%35%49%53%64%
Data source: Sanibel May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Sanibel in May

In May, Sanibel basks in a delightful 13 hours of daylight, marking a continuation of the sunny spring months. As the year unfolds, daylight gradually increases from 10 hours in January to peak at 13 hours from May through August, signaling a vibrant and lively atmosphere. This trend highlights a seasonal crescendo, where the longer days encourage outdoor activities and exploration of the stunning landscapes. As June rolls in, the daylight remains consistent, offering plenty of time for sun-soaked days before a gentle decline begins in September. With each passing month, Sanibel transforms, inviting both residents and visitors to revel in the beauty of longer, brighter days.

Average Daylight Hours in Sanibel for May

The chart illustrates the variation in daylight duration in Sanibel throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 40m11h 15m12h 1m12h 47m13h 26m13h 45m13h 35m13h12h 16m11h 29m10h 49m10h 29m
Data source: Sanibel daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Sanibel

In May, Sanibel enjoys a delightful average wind speed of 4.4 m/s (10 mph), maintaining a pleasant breeze that sets the perfect tone for outdoor activities. Following the winds of April, which also recorded a similar speed, May continues this trend of moderate winds, providing ideal conditions for beachgoers and nature enthusiasts alike. As summer approaches, June sees a gentle decline to 3.6 m/s (8 mph), hinting at the more tranquil experiences ahead. Conversely, the months prior exhibit a pattern of increasing wind speeds from January's calm 3.8 m/s (9 mph), peaking just before the summer. This rhythm of wind speeds not only enriches Sanibel's charm but also highlights the region's shifting seasonal dynamics, ensuring each visit offers a unique experience influenced by the ever-curious sea breeze.

Average May Wind Speed in Sanibel

The chart displays monthly wind speed patterns in Sanibel, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.84.64.34.34.4 m/s3.63.13.42.73.74.13.0
Data source: Sanibel May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Sanibel Compares to Other Months

The weather in Sanibel 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 Sanibel and find detailed weather information for every month.

May and January present contrasting weather patterns. In May, temperatures range from a minimum of 18°C (65°F) to a maximum of 32°C (90°F), making it a warm month with an average temperature of 26°C (79°F). The humidity is at 65%, and the month experiences significant rainfall, totaling 122 mm (4.8 in) over about 12 days. In contrast, January offers cooler temperatures, with a minimum of 3°C (38°F) and a maximum of 27°C (81°F), resulting in a comfortable average of 18°C (65°F). Rainfall is much less in January, with only 36 mm (1.4 in) over 4 days, and the humidity is higher at 83%. For more insights, you can check Sanibel weather in January.

May and February present notably different weather patterns, with May generally being warmer and more humid. In May, temperatures range from a minimum of 18°C (65°F) to a maximum of 32°C (90°F), with an average of 26°C (79°F). The month sees about 122 mm (4.8 in) of precipitation over approximately 12 days. In contrast, February experiences milder temperatures, ranging from 7°C (45°F) to 28°C (83°F), with an average of 21°C (69°F). Precipitation is significantly lower in February, totaling around 36 mm (1.4 in) over just 4 days, although the humidity is slightly higher at 80%. For those interested in the specifics of February weather, more information can be found here: Sanibel weather in February.

When comparing the weather in May and March, it's clear that May brings warmer temperatures and higher humidity. In May, the average temperature reaches 26°C (79°F), with maximums peaking at 32°C (90°F), while March offers a milder average of 21°C (71°F) and a maximum of 28°C (83°F). Additionally, May experiences significantly more rainfall, with 122 mm (4.8 in) over 12 days compared to March's modest 22 mm (0.9 in) over just 2 days. Interestingly, March has a higher humidity level at 75%, compared to May's 65%, making for a potentially more oppressive feel despite the warmer temperatures. For more detailed information on March weather, you can refer to Sanibel weather in March.

In comparing the weather of May and April, it is clear that May tends to be warmer with an average temperature of 26°C (79°F), while April has a slightly cooler average of 24°C (76°F). The minimum temperatures in May are also higher, starting at 18°C (65°F) compared to April's 13°C (56°F). However, May experiences significantly more rainfall, with 122 mm (4.8 in) over 12 days, contrasting with April's 42 mm (1.7 in) across just 7 days. Interestingly, humidity levels are fairly close, with May at 65% and April slightly higher at 68%. For more detailed information on April's weather, you can check Sanibel weather in April.

May and June present notable differences in weather patterns. In May, temperatures range from a minimum of 18°C (65°F) to a maximum of 32°C (90°F), with an average temperature of 26°C (79°F). The month sees a total precipitation of 122 mm (4.8 in) over approximately 12 days, accompanied by a humidity level of around 65%. Conversely, June experiences slightly higher temperatures, with a minimum of 23°C (74°F) and a maximum of 33°C (92°F), while the average temperature remains close at 27°C (82°F). Rainfall increases to 170 mm (6.7 in) spread over 22 days, and humidity also rises to 73%. For more specific details, you can explore Sanibel weather in June.

May and July in Sanibel present notable differences in weather conditions. May typically features a warmer average temperature of 26°C (79°F) with a minimum of 18°C (65°F), while July has a slightly higher minimum temperature of 24°C (75°F) and an average of 28°C (83°F). Both months share the same maximum temperature of 32°C (90°F). However, July sees significantly higher precipitation, with 195 mm (7.7 in) falling over 26 days compared to May's 122 mm (4.8 in) over just 12 days. Additionally, July's humidity rises to 77%, compared to May's 65%. For more information, check out Sanibel weather in July.

May and August weather conditions present notable differences in temperature and humidity. In May, temperatures range from a minimum of 18°C (65°F) to a maximum of 32°C (90°F), with an average of 26°C (79°F). This month experiences 122 mm (4.8 in) of precipitation over about 12 days, resulting in a humidity level of 65%. In contrast, August typically features higher temperatures, with a minimum of 24°C (76°F) and a maximum of 33°C (91°F), and an average temperature of 28°C (83°F). The rainfall in August is more substantial, reaching 206 mm (8.1 in) over 26 days, leading to an increased humidity of 80%. For more detailed information, you can visit Sanibel weather in August.

In May, temperatures gradually warm up with minimums around 18°C (65°F) and averages reaching 26°C (79°F), peaking at a maximum of 32°C (90°F). However, this month also experiences significant rainfall, averaging 122 mm (4.8 in) over about 12 days, along with moderate humidity at 65%. In contrast, September shows a slightly warmer climate, with minimum temperatures at 23°C (74°F) and averages of 28°C (82°F), while the maximums can reach 33°C (92°F). The month is wetter, with around 169 mm (6.7 in) of precipitation occurring over approximately 20 days, contributing to higher humidity levels at 83%. For more detailed information, check Sanibel weather in September.

May and October present intriguing contrasts in weather, despite having similar average temperatures. In May, the minimum temperature is slightly higher at 18°C (65°F), while in October, it dips to a cooler 14°C (58°F). Both months feature a maximum temperature of 32°C (90°F) and an average of 26°C (79°F/80°F). However, precipitation in May is significantly higher at 122 mm (4.8 in) compared to October's 76 mm (3.0 in), though both experience rainfall on about 12 days. Additionally, October's humidity is noticeably higher at 83%, making the air feel warmer than it is, while May has a more comfortable 65% humidity. To learn more about the specifics of October weather, visit Sanibel weather in October.

May and November present contrasting weather patterns, showcasing the transition from the warm spring to cooler autumn. In May, temperatures range from a minimum of 18°C (65°F) to a maximum of 32°C (90°F), with an average of 26°C (79°F) and a notable humidity level of 65%. This month also sees substantial rainfall, with 122 mm (4.8 in) of precipitation spread over 12 days. In contrast, November features milder temperatures, with a minimum of 11°C (52°F), an average of 23°C (73°F), and a maximum of 31°C (89°F). The precipitation significantly decreases to 44 mm (1.7 in) over just 6 days, but the humidity rises to 83%. For an in-depth look at November weather patterns, visit Sanibel weather in November.

May and December showcase distinct weather patterns, reflecting the transition from late spring to early winter. In May, temperatures range from a minimum of 18°C (65°F) to a maximum of 32°C (90°F), with an average of 26°C (79°F) and notable humidity levels at 65%. This month also experiences more rainfall, totaling 122 mm (4.8 in) over about 12 days. In contrast, December offers cooler temperatures, with daytime averages around 20°C (68°F), a maximum of 27°C (81°F), and a minimum of 8°C (46°F). Precipitation in December is significantly lower, at 52 mm (2.1 in) over just 6 days, though humidity rises to 84%. For more insights into December's climate, you can check Sanibel weather in December.

Compare Sanibel's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Sanibel

May in Sanibel heralds the arrival of warmer temperatures, showcasing a delightful mix of sunny days and refreshing breezes. With the mercury steadily climbing, this month stands out as a transition to the hotter summer months, offering an average high of 26°C and an inviting warmth that beckons outdoor activities. However, one should be mindful of the increased humidity and an uptick in precipitation, with around 12 days of rain adding a lush vibrancy to the landscape. Compared to the milder conditions of earlier months, May’s balance of warmth and occasional showers sets the tone for a beautiful summer ahead. For more insights, explore our detailed Sanibel Climate page.