18/08/2025
With high pressure in firm control tonight, it will be a very good night for optimal radiational cooling. Dew points in the 40s and light winds will allow temperatures to bottom out tonight, with morning lows in the 40s to low 50s. The main question on how chilly it gets tonight will be clouds. An increase in clouds is expected tonight, and if these clouds form a bit too early, it could limit how much cooling can occur. If skies stay clear long enough, the higher terrain could even drop into the upper 30s.
Tuesday night into Wednesday, return flow from the south ahead of a trough moving to our southwest will try to advect some moisture back into the region. This will help create more clouds across New England. This setup will also promote some scattered shower chances across the region. With that said, the air mass will remain on the drier side, so shower activity will be very spotty at best for most of the region.
Many areas will likely end up staying completely dry. The highest shower chances will be across the northern third of New England as the trough's influence will be closest. High pressure will remain to New England's east, feeding the drier air into the system and doing its best to dry up the showers. Temperatures and humidity will be similar to Monday and Tuesday.
High pressure will remain to New England's north late this week, continuing the cool, dry and quiet weather theme for the week. Thursday will continue to see highs in the 70s dominate the region. A moderation back toward seasonable temperatures will once again promote highs in the 80s by Friday, though a backdoor cold front may need to be watched Friday morning, which could result in the day trending cooler throughout the week.
Hurricane Erin will make its closest pass to New England Thursday into Friday morning. The high pressure to our north and the trough passing through around mid-week will help steer the hurricane well offshore of New England (and the entire east coast in general). The storm will create high swells across New England late this week, particularly for south-facing shorelines.