Weather October 11, 2021 1:02 am Forecast: The Boston Marathon Monday Forecast Marathon Monday: Mostly cloudy am, chance of sprinkles am (mainly south) and pm mix of sun. Tuesday: Highs in upper 60s to 70. Partly sunny. Temps staying in 70s all week. US & World Videos 3:45 Afternoon rains expected on Sunday 4:04 Afternoon clouds over the region on Saturday 3:24 Weather forecast: Highs in the 50s 3:43 Look out for showers this afternoon in Boston 3:41 Cool air to linger over Boston into the weekend