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Slough, England Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Slough, England?
Slough, England gets 561 mm of precipitation a year over about 147 rainy days. July is the warmest month (average high 24°C) and January the coldest (average low 2°C).
Oceanic climate
Slough, England has warm summers and chilly winters. Daytime highs range from about 8°C in January to 24°C in July. November is usually the wettest month. The most comfortable time to visit is typically May to September, when daytime highs sit near 21°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 2° | 8° |
| Spring | Mar–May | 6° | 15° |
| Summer | Jun–Aug | 13° | 23° |
| Autumn | Sep–Nov | 7° | 16° |
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. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 31% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 40% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 21%. The annual cloud-cover estimate is 31% of daylight hours; it is not a measurement of sunshine duration. 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
These records cover HEATHROW during 1973–2025. Earlier records or other stations in the city may differ.
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 in the available station history brought 52 mm of precipitation, 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 2° | 8° | 52 mm | 15 | 87% | 30% | 16° | -9° |
| February | 2° | 9° | 43 mm | 13 | 83% | 27% | 18° | -9° |
| March | 4° | 12° | 37 mm | 12 | 78% | 31% | 23° | -5° |
| April | 6° | 15° | 38 mm | 11 | 70% | 38% | 27° | -2° |
| May | 9° | 18° | 44 mm | 11 | 72% | 35% | 29° | -4° |
| June | 12° | 21° | 41 mm | 10 | 69% | 40% | 35° | 3° |
| July | 14° | 24° | 40 mm | 10 | 70% | 34% | 40° | 7° |
| August | 13° | 23° | 48 mm | 11 | 73% | 35% | 38° | 0° |
| September | 11° | 20° | 43 mm | 11 | 78% | 32% | 33° | -2° |
| October | 7° | 16° | 59 mm | 14 | 85% | 26% | 29° | -4° |
| November | 4° | 12° | 62 mm | 15 | 87% | 27% | 21° | -6° |
| December | 2° | 8° | 53 mm | 15 | 89% | 21% | 17° | -12° |
Station: HEATHROW, 10 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1973–2025; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
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?
Within the available 1973–2025 station history, 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 estimated sunshine of 40% of daylight hours from ERA5 cloud cover. 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.