Slough, England Weather by Month and Climate Averages

How much rain does Slough get?

Slough gets 561 mm of precipitation in an average year, spread over about 147 days with measurable rain. That is fewer rainy days than 99% of the UK.

November is the wettest month, with 62 mm. March is the driest, with 37 mm. November has the most rainy days, about 15.

The longest dry spell in the last five years lasted 24 days, to August 16, 2022.

Slough weather by month

Slough weather in January

In January, Slough averages a high of 8°C and a low of 2°C. It gets 52 mm of precipitation over about 15 rainy days. The sun is out about 30% of daylight hours. The January record high is 16°C (2022) and the record low is -9°C (1987).

Slough weather in February

In February, Slough averages a high of 9°C and a low of 2°C. It gets 43 mm of precipitation over about 13 rainy days. The sun is out about 27% of daylight hours. The February record high is 18°C (1998) and the record low is -9°C (1986).

Slough weather in March

In March, Slough averages a high of 12°C and a low of 4°C. It gets 37 mm of precipitation over about 12 rainy days. The sun is out about 31% of daylight hours. The March record high is 23°C (2012) and the record low is -5°C (2018).

Slough weather in April

In April, Slough averages a high of 15°C and a low of 6°C. It gets 38 mm of precipitation over about 11 rainy days. The sun is out about 38% of daylight hours. The April record high is 27°C (2011) and the record low is -2°C (2021).

Slough weather in May

In May, Slough averages a high of 18°C and a low of 9°C. It gets 44 mm of precipitation over about 11 rainy days. The sun is out about 35% of daylight hours. The May record high is 29°C (1989) and the record low is -4°C (2007). May is one of the most comfortable months to visit.

Slough weather in June

In June, Slough averages a high of 21°C and a low of 12°C. It gets 41 mm of precipitation over about 10 rainy days. The sun is out about 40% of daylight hours. The June record high is 35°C (1976) and the record low is 3°C (1991). June is one of the most comfortable months to visit.

Slough weather in July

In July, Slough averages a high of 24°C and a low of 14°C. It gets 40 mm of precipitation over about 10 rainy days. The sun is out about 34% of daylight hours. The July record high is 40°C (2022) and the record low is 7°C (1993). July is one of the most comfortable months to visit.

Slough weather in August

In August, Slough averages a high of 23°C and a low of 13°C. It gets 48 mm of precipitation over about 11 rainy days. The sun is out about 35% of daylight hours. The August record high is 38°C (2003) and the record low is 0°C (2009). August is one of the most comfortable months to visit.

Slough weather in September

In September, Slough averages a high of 20°C and a low of 11°C. It gets 43 mm of precipitation over about 11 rainy days. The sun is out about 32% of daylight hours. The September record high is 33°C (2023) and the record low is -2°C (2009). September is one of the most comfortable months to visit.

Slough weather in October

In October, Slough averages a high of 16°C and a low of 7°C. It gets 59 mm of precipitation over about 14 rainy days. The sun is out about 26% of daylight hours. The October record high is 29°C (2011) and the record low is -4°C (2009).

Slough weather in November

In November, Slough averages a high of 12°C and a low of 4°C. It gets 62 mm of precipitation over about 15 rainy days. The sun is out about 27% of daylight hours. The November record high is 21°C (2006) and the record low is -6°C (1993).

Slough weather in December

In December, Slough averages a high of 8°C and a low of 2°C. It gets 53 mm of precipitation over about 15 rainy days. The sun is out about 21% of daylight hours. The December record high is 17°C (2015) and the record low is -12°C (1981).

Sunshine, humidity and wind in Slough

June is the sunniest month in Slough, with sunshine about 40% of daylight hours. December is the cloudiest, at 21%. Over the year the sun shines about 31% of daylight hours. Slough is sunnier than 70% of the UK.

Humidity peaks in December at 89% and is lowest in June at 69%.

Slough has about 3 days a year above 32°C.

First and last freeze in Slough

The first fall freeze in Slough typically comes around November 16, and the last spring freeze around April 7. That leaves a frost-free growing season of about 223 days.

Slough weather records

The hottest temperature on record at the Slough station is 40°C, on July 19, 2022. The coldest is -12°C, on December 13, 1981.

The wettest day on record brought 52 mm of rain, on December 24, 1981.

34 all-time records have been set at the station since 1973.

The best time to visit Slough

The most comfortable time to visit is typically May to September, when daytime highs sit near 21°C.

Winter (December–February) is chilly, with average highs around 9°C and lows near 2°C.

Spring (March–May) is mild, with average highs around 15°C and lows near 6°C.

Summer (June–August) is warm, with average highs around 23°C and lows near 13°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 16°C and lows near 7°C.

Slough climate questions

How much rain does Slough get?

Slough gets 561 mm of precipitation in an average year, over about 147 rainy days.

What is the wettest month in Slough?

November is the wettest month in Slough, with 62 mm. March is the driest, with 37 mm.

How many rainy days does Slough have a year?

Slough has about 147 days with measurable rain in an average year. November has the most, about 15.

What is the hottest month in Slough?

July is the warmest month in Slough, with an average high of 24°C.

What is the coldest month in Slough?

January is the coldest month in Slough, with an average low of 2°C.

What is the record high temperature in Slough?

The record high at the Slough station is 40°C, set on July 19, 2022. The record low is -12°C, on December 13, 1981.

What is the sunniest month in Slough?

June is the sunniest month in Slough, with sunshine about 40% of daylight hours. December is the cloudiest.

When is the first frost in Slough?

The first fall freeze in Slough typically comes around November 16. The last spring freeze is around April 7.

What is the best time to visit Slough?

The most comfortable time to visit is typically May to September, when daytime highs sit near 21°C.