See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
18°
Overcast
Feels Like: 21°
Min: 12°
Max: 21°
The next few hours will be overcast, with today reaching 21°C and dropping to 11°C. The coming days will be mostly clear from afternoon until night.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:47
Sunrise
19:09
Sunset
Moon
Waxing Crescent
12:05
Moonrise
20:21
Moonset
Daily Forecast
Today
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Air Quality Data Available
Upgrade to access real-time air quality data for Alton.
UV Index
Humidity
Weather in Alton today, September 15, 2026
Alton starts September 15, 2026 under largely sunny skies, with bright spells setting the tone from the outset. Outdoor plans should enjoy long stretches of open sky as the day unfolds.
Expect highs of 21°C and cooler readings close to 12°C. Relative humidity sits between 55% and 92%, reaching its peak around 23:00. Airflow remains manageable, reaching about 6.7 km/h around 17:00.
The afternoon keeps an overcast feel, as cloud reaches about 100% around 12:00. Outdoor plans may still want a flexible backup. Expect visibility near 32.4 km, with poorer spells close to 9.8 km. Sunrise is at 06:47 and sunset at 19:09, giving 12 hours 22 minutes of sunlight today.
The practical takeaway for Alton is a bright September 15, 2026, ideal for outdoor errands before temperatures ease from about 21°C.
