Tonight in Southampton
Perfect sleeping conditions
You'll sleep beautifully.
Sleep Score
9
⁄10
Excellent
Overnight low
8°C
Cold — layer up
Stickiness
5°C
Dry & crisp
Cooling by 4am
2.8°C
Moderate cooling
Tonight's plan
Cold overnight — ideal for sleep depth if your bedroom stays above 16°C.
Windows
Open
Cooler, drier air outside — open windows tonight
Heating
Not needed
Cool but comfortably above the 16°C floor — duvet does the work
Bedding
Thick duvet + extra layer
Cold night — your body needs insulation to maintain core temperature
Fan
Not needed
Cool enough without — save the electricity
Based on temperature, dew point, wind, and overnight cooling
Why this matters
8°C is cool — ideal for sleep depth. Research shows deeper slow-wave sleep in cooler bedrooms, as long as the room stays above about 16°C. If your bedroom drops below that, sleep quality starts to decline again.
Dew point is just 5°C — dry, fresh air. This is the kind of night where an open window does exactly what you want it to: brings in cool, comfortable air that helps your body maintain its natural overnight temperature drop.
The week ahead
Tue will be the best night, wed the worst.
Southampton · next 7 nights
Every night this week looks comfortable.