Mystic River - Island End River Weather Forecast
- 69
- 87
Chance Thunderstorms
- 62
- 83
Mostly Sunny
- 65
- 85
Mostly Sunny
- 70
- 85
Rain Showers
- 68
- 87
Rain Showers Likely
- 66
- 85
Slight Chance Rain Showers
Today 18 Jul Suffolk
Partly sunny in the Morning, then mostly cloudy with Showers likely with a slight chance of Thunderstorms in the afternoon. Patchy smoke. Some Thunderstorms may produce heavy rainfall in the afternoon. Highs in the mid 80s. Temperature falling into the upper 70s in the afternoon. Southwest Winds 5 to 10 Mph with Gusts up to 25 Mph, increasing to 15 to 20 Mph with Gusts up to 35 Mph in the afternoon. Chance of rain 70 percent.
Tonight 18 Jul Suffolk
Showers with a chance of Thunderstorms in the Evening, then Showers likely after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Humid with Lows in the upper 60s. Southwest Winds 15 to 20 Mph. Gusts up to 35 Mph, decreasing to 25 Mph after midnight. Chance of rain 90 percent.
Mystic River - Island End River Temperature Statistics
July Temperature
Boston, Logan International Airport (2.5 miles)
Lowest 8 July, 2026
61.6 °FAverage July
78.7 °FHighest 2 July, 2026
101.6 °F
Climate (2021–2026)
Boston, Logan International Airport (2.5 miles)
Average Low 2021–2026
46.7 °FAverage 2021–2026
53.6 °FAverage High 2021–2026
61 °F