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Welwyn Weather in September
In Welwyn, September brings pleasant daytime temperatures around 20°C (68°F), with nights cooling to 11°C (52°F). Some rainfall is to be expected.
Rainfall in Welwyn in September
You can expect rain on around 12 days based on historical patterns, with 55 mm (2.2 in) average for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Welwyn in September
September tends to be one of the excellent months in Welwyn, with 20°C (68°F) in the afternoon and 11°C (52°F) overnight. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Welwyn in September
With about 155 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Welwyn.
Welwyn Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
20°C (68°F)
Chance of Rain
40%
Precipitation
55 mm (2.2 in)
Rainy days
12 days
Humidity
73% *
Sunshine
155 hours *
Percentage Sunshine
40% *
* Data from: London, the United Kingdom (41 KM, 25 Miles).
Welwyn Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Welwyn - and find the best time to visit.
Best Places in the United Kingdom in September
Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month. See all of the United Kingdom in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Welwyn in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Welwyn in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling10/10 -
Walking10/10 -
Barbeque7/10 -
Camping8/10 -
Outdoor sports10/10
Welwyn 3-Day Forecast
More climate data for Welwyn
Temperature Rainfall Sunshine Humidity
See the full Welwyn climate overview or explore weather in the United Kingdom.
Popular in September
Where to go in September - average daytime high across popular destinations.
London
20°C (68°F) Bath19°C (66°F) Torquay19°C (66°F) Manchester
18°C (64°F) York19°C (66°F) Edinburgh17°C (63°F) Blackpool17°C (63°F) Glasgow17°C (63°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Hike the South West Coast Path
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