Climate and monthly weather forecastGalveston, TX
Climate and monthly weather forecast
The climate of Galveston
Identified within the Köppen climate classification as Cfa, Galveston, Texas, possesses a humid subtropical climate lacking a dry season. This coastal city situated in the Gulf of Mexico experiences consistent weather, with variations in temperature, humidity, and other parameters.Examining the year as a whole, Galveston enjoys mild winters with temperatures ranging from 51.6°F (10.9°C) to 62.6°F (17°C) and warmer summers where temperatures occasionally reach 87.4°F (30.8°C). Relative humidity remains fairly stable throughout the year, fluctuating between 75% and 81%, which contributes to the city’s overall moist atmosphere. Rainfall is another constant factor, with the city receiving between 0.75" (19mm) and 4.29" (109mm) per month. Interestingly, despite the high rainfall, snow is a rare occurrence, only making an appearance a few days a year.
The city's maritime environment greatly impacts its weather patterns. The temperature of the sea varies from 56.5°F (13.6°C) in colder months to 87.2°F (30.7°C) during the peak of the summer. These temperature fluctuations influence Galveston's mild climate trend. Moreover, wind speeds generally hover between 9.4mph (15.1km/h) and 12.9mph (20.8km/h), while visibility remains constant at approximately 6 miles all year round.
An interesting anomaly in Galveston’s weather pattern is the amount of sunlight it receives. Despite the consistently high level of cloud cover ranging from 26% to 49%, the number of sunshine days can range anywhere from 8.3 days to 18.2 days a month, providing an ample amount of pleasant, sunny days.
The Best Time to Visit Galveston
For optimal weather conditions, the best period to visit Galveston would be around May. During this month, the average high temperature is 79.3°F (26.3°C) and the low is 73.8°F (23.2°C). Moreover, the sea temperature reaches 77.5°F (25.3°C) making outdoor water activities comfortable. Wind conditions are also more favorable with an average velocity of 12.1mph (19.5km/h). The UV index is at 7, so precautions and sun protection are advisable.The Worst Time to Visit Galveston
If visitors are averse to high humidity and rainfall, September is potentially a less ideal time for a Galveston trip. Average rainfall peaks to an annual high of 4.29" (109mm) spread across approximately 19.9 days. Despite high temperatures hovering around 84.2°F (29°C), the high humidity of 75% may result in an overall uncomfortable experience.Spring Weather in Galveston
Spring ushers in a gradual rise in temperatures for Galveston ranging from 51.6°F (10.9°C) to 73°F (22.8°C). Rainfall moderately increases from 1.22" (31mm) to 1.85" (47mm) during this period. As snowfall is absent, the weather during spring is primarily characterized by moderate temperatures and a noticeable increase in daylight hours from 10.5 to 13.6 hours.Summer Weather in Galveston
Summer in Galveston is characterized by high temperatures reaching up to 87.4°F (30.8°C). Alongside this, relative humidity also increases to around 77%. Summer is also the wettest season with rainfall climbing to 3.46" (88mm) in August. Even though these months experience the highest cloud cover percentages, the city still receives considerable sunlight, 10.8 hours on average per day.Autumn Weather in Galveston
Autumn sees a reduction in temperature, starting from 84.2°F (29°C) in September and dropping to 68.9°F (20.5°C) by November. Rainfall also lessens from its summertime high but is still significant, clocking in at 2.28" (58mm). Despite the fall in temperatures, the sea remains warm averaging 83.8°F (28.8°C) in September, steadily cooling to 69°F (20.6°C) by November.Winter Weather in Galveston
Though experiencing its coldest months, winters in Galveston are relatively mild with temperatures from 54.9°F (12.7°C) to 62.6°F (17°C). The sea temperatures drop to their annual minimum, settling at 60.3°F (15.7°C) by December. Rainfall also reduces to its lowest for the year at 1.38" (35mm), and the city sees increasing amounts of sunshine, with the count of sunshine days reaching 14.3 by December. Winter is also characterized by slightly higher wind speeds, averaging at 12.1mph (19.5km/h) by the year-end.Weather in January
Starting off the year is a period of cold weather coupled with an average humidity signal of 77%. January sees a calm wind, moving at approximately 12mph (19.3km/h) and peaking at 18.3mph (29.5km/h). As Galveston transitions from the holiday season, residents prepare for less hours of sunshine, daylight, bouts of rainfall and even snowfall, albeit very limited. Weather in January »Weather in February
As winter nears its end, February in Galveston offers a glimpse of warmth. The sea temperature clocks in at 57.4°F (14.1°C) offering a slightly warmer condition for aquatic enthusiasts compared to January. Days become slightly longer, virtually opening doors for longer periods of outdoor activities. Weather in February »Weather in March
Galveston welcomes Spring as March kicks in, bringing forth a considerable increase in overall temperatures. A notable warmth comes to the Galveston sea, which heats up to 62.9°F (17.2°C), creating a pleasant environment for water-related endeavors. Weather in March »Weather in April
Further ushering in the spring tide, April responds with a rise in various weather parameters. A distinguishing feature of April is the rapid increase in sea temperature, it soars to a comfortable 71.3°F (21.8°C) inviting a lot of beach activity. Weather in April »Weather in May
May sees the emergence of summer in Galveston, making it warmer and brighter. In contrast to the previous months, May experiences a significant rainfall increase hitting 1.85" (47mm) on average while cloud cover decreases to a mere 30%. Weather in May »Weather in June
The heat continues to intensify as Galveston, Texas moves deeper into summer. Noticeably, the sea gets warmer, reaching a welcoming 83.9°F (28.8°C), making the water almost irresistible for swimming and diving. June is indeed a sunny and lively month, despite the humidity and rain which also begin to increase. Weather in June »Weather in July
As the peak of summer, July experiences the highest temperatures all year. The sultry days, hinted by the sea temperature climaxing at 86.1°F (30.1°C), are balanced out by a breeze blowing at a cozy 9.8mph (15.8km/h). July is not only the warmest but also sees some of the highest rainfall levels peaking at an average of 3.19" (81mm). Weather in July »Weather in August
August continues riding the crest of Galveston’s summer wave, witnessing the year's highest average low temperature of 81.9°F (27.7°C). This peak summer month also faces a notably high amount of rainfall, experiencing an average of 3.46" (88mm). Weather in August »Weather in September
With the advent of September, Galveston starts bidding farewell to the summer and welcoming Fall. September sets the peak annual rainfall record with an average of 4.29" (109mm). Despite this shift, the sea remains warm, and the breeze is consistent, providing solace from the remaining heat of summer days. Weather in September »Weather in October
October offers respite from the hot summer months and a preview of the upcoming winter in Galveston. October stands out with a stark contrast to September, experiencing a significant drop in rainfall to an average of 2.28" (58mm). Weather in October »Weather in November
November marks the beginning of low temperatures and less rainfall in Galveston, Texas, moving decisively into the colder months. A noticeable reduction to 61.3°F (16.3°C) in the average temperature makes water activities less desirable. Weather in November »Weather in December
Finally, December sees the full onset of winter with moderately chilly temperatures and the sea cooling down to 60.3°F (15.7°C). This decrease in water temperature coincides with the year's lowest average temperature of 54.9°F (12.7°C), making December the coldest month of the year. Weather in December »Updated: Aug 28, 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
In Galveston, January is the coldest month, with temperatures averaging a high of 59.7°F (15.4°C) and a low of 51.6°F (10.9°C).
In Galveston, during the entire year, the rain falls for 161.9 days and collects up to 24.33" (618mm) of precipitation.
Months with snowfall are January and February.
The month with the most snowfall days is January, when snow falls for 0.3 days.
In Galveston, during the entire year, snow falls for 0.4 days.
January is the month with the coldest seawater, with an average ocean temperature of 56.5°F (13.6°C).
The months with the lowest UV index in Galveston are January and December, with an average maximum UV index of 4.
The months with the highest humidity are February and March, with an average relative humidity of 81%.
The months with the least rainfall are February and March Rain falls for 10.8 days and accumulates 0.75" (19mm) of rain.
March through December are months without snowfall.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
May through September, with an average maximum UV index of 7, are months with the highest UV index.
June has the longest days of the year in Galveston, with an average of 14h and 0min of daylight.
In Galveston, August records the average highest temperatures, peaking at 87.4°F (30.8°C) and reaching a low of 81.9°F (27.7°C).
The month with the warmest seawater is August, with an average ocean temperature of 87.3°F (30.7°C).
With an average of 10.9h of sunshine, August has the most sunshine of the year.
The month with the most rainfall is September, when the rain falls for 19.9 days and typically aggregates up to 4.29" (109mm) of precipitation.
With an average relative humidity of 72%, October is the least humid month.
The month with the shortest days is December, with an average of 10h and 18min of daylight.
With an average of 4.9h of sunshine, December has the least sunshine of the year.
Average temperature
Galveston, TX
The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is January (59.7°F).
The month with the highest average low temperature is August (81.9°F).
The coldest month (with the lowest average low temperature) is January (51.6°F).
Average pressure
Galveston, TX
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Galveston, TX
- Average wind speed in January:
12mph - Average wind speed in February:
12.2mph - Average wind speed in March:
12mph - Average wind speed in April:
12.9mph - Average wind speed in May:
12.1mph - Average wind speed in June:
10.9mph
- Average wind speed in July:
9.8mph - Average wind speed in August:
9.4mph - Average wind speed in September:
9.6mph - Average wind speed in October:
11.3mph - Average wind speed in November:
11.9mph - Average wind speed in December:
12.1mph
The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is August (9.4mph).
Average humidity
Galveston, TX
The months with the highest relative humidity are February and March (81%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Galveston, TX
- Average rainfall in January:
1.22" - Average rainfall in February:
0.75" - Average rainfall in March:
0.75" - Average rainfall in April:
0.98" - Average rainfall in May:
1.85" - Average rainfall in June:
2.68"
- Average rainfall in July:
3.19" - Average rainfall in August:
3.46" - Average rainfall in September:
4.29" - Average rainfall in October:
2.28" - Average rainfall in November:
1.5" - Average rainfall in December:
1.38"
The wettest month (with the highest rainfall) is September (4.29").
The driest months (with the least rainfall) are February and March (0.75").
Average rainfall days
Galveston, TX
- Average rainfall days in January:
10.1 days - Average rainfall days in February:
10.8 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
10.7 days - Average rainfall days in May:
11.3 days - Average rainfall days in June:
14.2 days
- Average rainfall days in July:
18.3 days - Average rainfall days in August:
19.4 days - Average rainfall days in September:
19.9 days - Average rainfall days in October:
12.5 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
13 days
The month with the highest number of rainy days is September (19.9 days).
The month with the least rainy days is January (10.1 days).
Average snowfall days
Galveston, TX
- Average snowfall days in January:
0.3 days - Average snowfall days in February:
0.1 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 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 days - Average snowfall days in December:
0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average sea temperature
Galveston, TX
The best month for swimming (with the highest average sea temperature) is August (87.2°F).
The coldest month (with the lowest average sea temperature) is January (56.5°F).
Average daylight / Average sunshine
Galveston, TX
- Average daylight in January:
10h and 30min - Average daylight in February:
11h and 12min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 54min - Average daylight in May:
13h and 36min - Average daylight in June:
14h and 0min
- Average daylight in July:
13h and 48min - Average daylight in August:
13h and 12min - Average daylight in September:
12h and 18min - Average daylight in October:
11h and 30min - Average daylight in November:
10h and 42min - Average daylight in December:
10h and 18min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in January:
5h and 24min - Average sunshine in February:
6h and 0min - Average sunshine in March:
7h and 12min - Average sunshine in April:
9h and 0min - Average sunshine in May:
10h and 18min - Average sunshine in June:
10h and 48min
- Average sunshine in July:
10h and 48min - Average sunshine in August:
10h and 54min - Average sunshine in September:
8h and 54min - Average sunshine in October:
6h and 54min - Average sunshine in November:
5h and 54min - Average sunshine in December:
4h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days
Galveston, TX
- Average sunshine days in January:
18.2 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
17.6 days - Average sunshine days in April:
17 days - Average sunshine days in May:
17.8 days - Average sunshine days in June:
12.8 days
- Average sunshine days in July:
10.2 days - Average sunshine days in August:
8.3 days - Average sunshine days in September:
8.5 days - Average sunshine days in October:
15.8 days - Average sunshine days in November:
17.7 days - Average sunshine days in December:
14.3 days
The month with the most sunshine days is January (18.2 days).
The month with the least sunshine days is August (8.3 days).
Average UV index
Galveston, TX
The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover
Galveston, TX
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June, July, August and October (Cloud cover 26).
Average visibility
Galveston, TX
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).
