Chelmsford, England Weather by Month and Climate Averages

How much rain does Chelmsford get?

Chelmsford gets 590 mm of precipitation in an average year, spread over about 164 days with measurable rain. That is fewer rainy days than 82% of the UK.

October is the wettest month, with 61 mm. March is the driest, with 35 mm. January has the most rainy days, about 17.

The longest dry spell in the last five years lasted 29 days, to July 25, 2026.

Chelmsford weather by month

Chelmsford weather in January

In January, Chelmsford averages a high of 8°C and a low of 2°C. It gets 55 mm of precipitation over about 17 rainy days. The sun is out about 32% of daylight hours. The January record high is 16°C (2015) and the record low is -15°C (1987).

Chelmsford weather in February

In February, Chelmsford averages a high of 8°C and a low of 2°C. It gets 44 mm of precipitation over about 15 rainy days. The sun is out about 28% of daylight hours. The February record high is 18°C (2004) and the record low is -14°C (2012).

Chelmsford weather in March

In March, Chelmsford averages a high of 12°C and a low of 3°C. It gets 35 mm of precipitation over about 13 rainy days. The sun is out about 32% of daylight hours. The March record high is 22°C (1990) and the record low is -11°C (1970).

Chelmsford weather in April

In April, Chelmsford averages a high of 14°C and a low of 4°C. It gets 39 mm of precipitation over about 13 rainy days. The sun is out about 39% of daylight hours. The April record high is 27°C (2018) and the record low is -6°C (1996).

Chelmsford weather in May

In May, Chelmsford averages a high of 18°C and a low of 7°C. It gets 44 mm of precipitation over about 11 rainy days. The sun is out about 36% of daylight hours. The May record high is 33°C (2026) and the record low is -2°C (2021). May is one of the most comfortable months to visit.

Chelmsford weather in June

In June, Chelmsford averages a high of 21°C and a low of 10°C. It gets 50 mm of precipitation over about 11 rainy days. The sun is out about 40% of daylight hours. The June record high is 37°C (2026) and the record low is 1°C (1989). June is one of the most comfortable months to visit.

Chelmsford weather in July

In July, Chelmsford averages a high of 23°C and a low of 12°C. It gets 45 mm of precipitation over about 12 rainy days. The sun is out about 35% of daylight hours. The July record high is 39°C (2022) and the record low is 3°C (1978). July is one of the most comfortable months to visit.

Chelmsford weather in August

In August, Chelmsford averages a high of 23°C and a low of 12°C. It gets 52 mm of precipitation over about 11 rainy days. The sun is out about 38% of daylight hours. The August record high is 36°C (2003) and the record low is 2°C (1979). August is one of the most comfortable months to visit.

Chelmsford weather in September

In September, Chelmsford averages a high of 19°C and a low of 10°C. It gets 48 mm of precipitation over about 12 rainy days. The sun is out about 34% of daylight hours. The September record high is 32°C (2023) and the record low is -1°C (2003). September is one of the most comfortable months to visit.

Chelmsford weather in October

In October, Chelmsford averages a high of 15°C and a low of 7°C. It gets 61 mm of precipitation over about 15 rainy days. The sun is out about 27% of daylight hours. The October record high is 28°C (2011) and the record low is -7°C (1997).

Chelmsford weather in November

In November, Chelmsford averages a high of 11°C and a low of 4°C. It gets 61 mm of precipitation over about 17 rainy days. The sun is out about 28% of daylight hours. The November record high is 18°C (2010) and the record low is -8°C (1983).

Chelmsford weather in December

In December, Chelmsford averages a high of 8°C and a low of 2°C. It gets 56 mm of precipitation over about 17 rainy days. The sun is out about 22% of daylight hours. The December record high is 17°C (1985) and the record low is -18°C (1981).

Sunshine, humidity and wind in Chelmsford

June is the sunniest month in Chelmsford, with sunshine about 40% of daylight hours. December is the cloudiest, at 22%. Over the year the sun shines about 33% of daylight hours. Chelmsford is sunnier than 78% of the UK.

Humidity peaks in December at 89% and is lowest in July at 71%.

Chelmsford has about 2 days a year above 32°C.

First and last freeze in Chelmsford

The first fall freeze in Chelmsford typically comes around October 21, and the last spring freeze around May 3. That leaves a frost-free growing season of about 171 days.

Chelmsford weather records

The hottest temperature on record at the Chelmsford station is 39°C, on July 18, 2022. The coldest is -18°C, on December 13, 1981.

The wettest day on record brought 68 mm of rain, on August 22, 1987.

41 all-time records have been set at the station since 1970.

The annual mean temperature has changed by +0.3°C per decade since 1970.

The best time to visit Chelmsford

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 8°C and lows near 2°C.

Spring (March–May) is mild, with average highs around 15°C and lows near 5°C.

Summer (June–August) is warm, with average highs around 22°C and lows near 11°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 15°C and lows near 7°C.

Chelmsford climate questions

How much rain does Chelmsford get?

Chelmsford gets 590 mm of precipitation in an average year, over about 164 rainy days.

What is the wettest month in Chelmsford?

October is the wettest month in Chelmsford, with 61 mm. March is the driest, with 35 mm.

How many rainy days does Chelmsford have a year?

Chelmsford has about 164 days with measurable rain in an average year. January has the most, about 17.

What is the hottest month in Chelmsford?

July is the warmest month in Chelmsford, with an average high of 23°C.

What is the coldest month in Chelmsford?

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

What is the record high temperature in Chelmsford?

The record high at the Chelmsford station is 39°C, set on July 18, 2022. The record low is -18°C, on December 13, 1981.

What is the sunniest month in Chelmsford?

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

When is the first frost in Chelmsford?

The first fall freeze in Chelmsford typically comes around October 21. The last spring freeze is around May 3.

What is the best time to visit Chelmsford?

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