Rain Likely in Boston on September 21, 2026
• According to the National Weather Service (NWS) and the NWS Daily Climate Report (CLI), there is a possibility of measurable precipitation in Boston, MA, on September 21,
• Measurable precipitation is defined as 0.01 inches or more of liquid-equivalent rainfall. The observation period for this forecast is from midnight to midnight local standard time. The final determination of whether measurable precipitation occurs will be based on the NWS CLI report, which is expected to be published by 2:00 PM ET on September 22,
Impact & Risks
The potential for measurable rainfall in Boston on September 21, 2026, could lead to localized disruptions, particularly for outdoor activities and travel. While the forecast does not currently indicate severe weather, residents and visitors should remain aware of changing conditions, as the stalled frontal boundary and associated moisture could lead to heavier rainfall in some areas. The Ohio Valley and Appalachians are also expected to experience localized heavy rain, which could exacerbate flooding risks in those regions.
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