About

A single question, answered well.

Will you sleep well tonight? Sleep Forecast exists to answer that question for every UK town, every night, with a single number and a clear plan.

What it does

Sleep Forecast publishes a Sleep Score from 0 to 10 for 163 UK cities and towns, updated every 30 minutes. The score tells you whether tonight's overnight conditions — temperature, humidity, and cooling — will make it easy or hard to sleep. A 9 means open the window and sleep beautifully. A 2 means fan on, sheet only, and brace yourself.

Beyond the score, every city page includes a structured Tonight's Plan (window, heating, bedding, fan), a 7-night outlook, and the sleep science behind the numbers.

How the score works

Three measurements, weighted by their impact on sleep quality:

50%

Overnight minimum temperature

The single biggest factor. Above 20°C most adults struggle. Above 22°C it's brutal. Ideal is 16–18°C.

30%

Dew point

The honest measure of sticky air. We use dew point, not relative humidity, because it doesn't change with temperature. Above 16°C it's uncomfortable; above 18°C your sweat can't evaporate.

20%

Overnight cooling

How much the temperature drops between bedtime and 4am. Your body expects a dip. When it doesn't come, sleep is lighter and more fragmented.

For a deeper dive, read How the Sleep Score works.

The data

All weather data comes from Open-Meteo, an open-source weather API that aggregates data from national weather services including the Met Office, DWD, and NOAA. Postcode lookups use postcodes.io.

We hold 11 years of nightly sleep scores for every location in our dataset (2015 to present), which powers the historical context and seasonal comparison features. Forecasts update every 30 minutes.

Who built it

Sleep Forecast was built by Lawrence in Royal Leamington Spa. It's a free public tool — no accounts, no ads, no affiliate links for mattresses nobody asked about. If you find it useful, share it with someone who sleeps badly in summer.

Get in touch

For press enquiries, data requests, or feedback: hello@sleepforecast.co.uk