During the week of 7 July 2025 - 13 July 2025, temperatures averaged at 26 °C (79 °F) during the day and dropped to 21 °C (70 °F) at night. Both the daily and night temperatures in Southampton are roughly same as the long-term average, which is around 27 °C (81 °F) and 18 °C (64 °F) respectively. Tuesday and Wednesday marked the hottest days of the week. The average temperatures observed during different times of day (based on local time) were as below: 7am 22 °C (72 °F), 10am 23 °C (73 °F), 1pm 25 °C (77 °F), 4pm 25 °C (77 °F), 7pm 24 °C (75 °F), 10pm 23 °C (73 °F).

There were 4 days without rain, 2 days with light rain and 1 day with moderate rain during this week. The total precipitation for the week in Southampton was 24 mm (0.94 in), which is slightly above the area's average of 19 mm (0.75 in). On average, the cloud coverage during daylight hours (from dawn to dusk) was 56 %.

Average speed of wind was 3.4 m/s. The air pressure was 1013 hpa - 1020 hpa. On average, the air humidity in Southampton was 93 %.

During the daytime (from dawn to dusk), there were in average: 5 hours clear skies, 4 hours partially overcast skies, 6 hours overcast skies and 0.5 hours rainy weather. Average time of sunrise was 05:26, average time of sunset was 20:22.

Weather overview

Southampton (United States of America) in general has a mild continental climate. Temperatures during the day are in the range from 4 °C (39 °F) in January to 27 °C (81 °F) in July. The driest month is September with just 8 days of rain, on the contrary, the month when it rains the most is December with 11 days of rain. The highest sea temperatures in Southampton are in August with 21 °C (70 °F) and the lowest in February with 4 °C (39 °F). The highest night temperatures could be experienced in July with 18 °C (65 °F), the lowest in January with -4 °C (24 °F).

January weather

The sea temperature descents similarly to the previous month, with its value of 6 °C (42 °F) in Southampton, while the minimum of the day temperature is observable, with its value of 4 °C (39 °F). The number of rainy days descent's start could be observed. The night temperature reaches its minimum, the value of this measure is -4 °C (24 °F). The number of sun hours (without clouds) starts to rise, with its value of 6 hours. The maximum of the wind speed can be noticed, the value of this measure is 5.

February weather

The beginning of the rise of the day temperature could be noticed, the value of this measure is 5 °C (40 °F) in Southampton, while the sea temperature is on its minimum, its value is 4 °C (39 °F). The night temperature starts to rise. The rise of the number of sun hours (without clouds) can be observed, its value is 7 hours.

March weather

The maximum of the rainfall amount can be noticed, with its value of 117 mm (4.61 in) in Southampton. The night temperature rises similarly to the previous month, with its value being 0 °C (31 °F), and the day temperature continues to rise too, the value of this measure is 9 °C (47 °F). The number of sun hours (without clouds) continues to rise, with its value being 7 hours.

April weather

The beginning of the rise of the sea temperature could be noticed in Southampton, while the rise of the day temperature can be observed, the value of this measure is 14 °C (57 °F). The rise of the night temperature can be observed, with its value being 5 °C (40 °F). The rainfall amount starts to descent, its value is 107 mm (4.23 in). The number of sun hours (without clouds) continues to rise, its value is 8 hours. The humidity reaches its minimum, with its value of 63 %.

May weather

The rise of the sea temperature can be observed, the value of this measure is 11 °C (52 °F) in Southampton, and the day temperature continues to rise too, its value is 19 °C (66 °F). The night temperature continues to rise, with its value of 9 °C (49 °F). The descent of the rainfall amount can be observed, with its value of 91 mm (3.57 in). The number of sun hours (without clouds) continues to rise, with its value being 9 hours.

June weather

The rise of the sea temperature can be observed, its value is 16 °C (61 °F) in Southampton, and the rise of the day temperature can be observed as well, with its value being 24 °C (76 °F). The number of rainy days starts to descent in June. The maximum of the number of sun hours (without clouds) is observable, the value of this measure is 9 hours. The rise of the night temperature can be observed, its value is 15 °C (59 °F). The maximum of the day length is observable, its value is 15 hours.

July weather

The maximum of the day temperature can be noticed, with its value of 27 °C (81 °F) in Southampton, while the sea temperature rises similarly to the previous month, with its value of 20 °C (68 °F). The tourist season slowly starts. The descent of the number of rainy days can be observed, the value of this measure is 8 days, while the rainfall amount is on its minimum in July. The night temperature is on its maximum in this month.

August weather

The tourist season is taking place in Southampton. The rainfall amount rise's start could be observed, the value of this measure is 99 mm (3.90 in). The maximum of the sea temperature can be noticed in this month. The number of sun hours (without clouds) descents similarly to the previous month.

September weather

The ongoing tourist season is noticeable in Southampton. The beginning of the descent of the sea temperature could be noticed, with its value of 20 °C (68 °F), and the beginning of the descent of the day temperature could be noticed too, its value is 23 °C (74 °F). The number of rainy days reaches its minimum in this month. The humidity is on its maximum, with its value being 75 %. The night temperature descent's start could be observed, the value of this measure is 14 °C (57 °F).

October weather

The descent of the sea temperature can be observed, its value is 17 °C (62 °F) in Southampton, and the day temperature descents similarly to the previous month too, with its value being 18 °C (64 °F). The night temperature continues to descent, its value is 8 °C (46 °F). The descent of the number of sun hours (without clouds) can be observed.

November weather

The sea temperature descents similarly to the previous month, with its value being 13 °C (55 °F) in Southampton, and the descent of the day temperature can be observed too, with its value being 13 °C (55 °F). The beginning of the rise of the number of rainy days could be noticed, with its value of 10 days, and the beginning of the rise of the rainfall amount could be noticed as well in November. The night temperature continues to descent, its value is 3 °C (38 °F). The number of sun hours (without clouds) descents similarly to the previous month, the value of this measure is 5 hours.

December weather

The day temperature continues to descent in Southampton, and the sea temperature descents similarly to the previous month too, its value is 9 °C (48 °F). The rise of the rainfall amount can be observed, the value of this measure is 112 mm (4.41 in), while the maximum of the number of rainy days is observable. The descent of the night temperature can be observed, the value of this measure is -1 °C (29 °F). The number of sun hours (without clouds) reaches its minimum in this month.

Is June part of the wet season in Southampton?

No, there is no wet season in June in Southampton - you can expect 10 days of rain during the month.

Is it hot in Southampton in July?

In Southampton in July, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.

What is the sea temperature in August in Southampton?

The temperature of the sea in August in Southampton is 21 °C (70 °F). The sea at this temperature is quite cold, but it is already possible to stay in it for a long time and it is pleasantly refreshing on hot, steamy days.

Is September a good month to visit Southampton?

There are good conditions for visiting in September in Southampton. You can expect just 8 days of rain during the month, taking an umbrella is not necessary. There are some people, who may feel a slight chill at 23 °C (74 °F), but others will feel perfectly fine. A sea temperature of 20 °C (68 °F) can seem colder to some, but others will call it refreshing. The temperature of 14 °C (57 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.

What is the temperature in Southampton during the day in October?

In October in Southampton, the average daily temperatures will be 18 °C (64 °F). Nice temperature for walking around the city or on the beach, but you will probably get cold soon when wearing a swimsuit. When walking around all day, people used to cold conditions, pull out their shorts and get rid of their sweaters. On some days, when spending time in the direct sun, sunscreen can be useful, especially for people with more sensitive skin.