Weston, Massachusetts, USA
81.9°F
27.7°C
Hot
Clear
This Afternoon: Hi 79 °F
Tonight: Lo 57 °F
Dew Point: 57.2°F
Humidity: 43%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Monday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 3 mph
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Tue May 14, 2024 1:07pm EDT
Warm and mainly dry today with some uncertainty regarding how mild Wednesday will be. Heading into a cloudier and unsettled weather pattern for late in the week into the weekend, as a series of slow-moving upper level disturbances move through Southern New England. While it is not likely to be raining the entire period, at least hit or miss showers can't be ruled out at any time. Temperatures for late in the week into the weekend trend slightly cooler than normal on high temperatures and milder than normal on the lows.
Sunny
Hi 79 °F
Sunny, with a high near 79. South wind around 12 mph.
Mostly Cloudy then Slight Chance Rain Showers
Lo 57 °F
A slight chance of rain showers after 4am. Mostly cloudy, with a low around 57. Southwest wind 3 to 10 mph. Chance of precipitation is 20%.
Slight Chance Rain Showers
Hi 72 °F
A slight chance of rain showers before 4pm. Cloudy, with a high near 72. Southwest wind 3 to 9 mph. Chance of precipitation is 20%.
Cloudy then Chance Rain Showers
Lo 56 °F
A chance of rain showers after midnight. Cloudy, with a low around 56. Southeast wind 2 to 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Chance Light Rain
Hi 66 °F
A chance of rain showers before 9am, then a chance of rain. Mostly cloudy, with a high near 66. East wind 3 to 12 mph. Chance of precipitation is 40%.
Chance Light Rain
Lo 53 °F
A chance of rain. Mostly cloudy, with a low around 53. Northeast wind around 13 mph. Chance of precipitation is 30%.
Slight Chance Light Rain
Hi 66 °F
A slight chance of rain. Partly sunny, with a high near 66. Northeast wind 10 to 15 mph.
Chance Light Rain
Lo 52 °F
A chance of rain. Mostly cloudy, with a low around 52. Northeast wind 9 to 13 mph. Chance of precipitation is 30%.
Chance Light Rain
Hi 61 °F
A chance of rain. Mostly cloudy, with a high near 61. Northeast wind 9 to 14 mph. Chance of precipitation is 40%.
Chance Light Rain
Lo 52 °F
A chance of rain. Mostly cloudy, with a low around 52. Northeast wind 9 to 13 mph. Chance of precipitation is 50%.
Chance Light Rain
Hi 65 °F
A chance of rain. Mostly cloudy, with a high near 65. Northeast wind around 12 mph. Chance of precipitation is 40%.
Chance Light Rain
Lo 53 °F
A chance of rain. Mostly cloudy, with a low around 53. Northeast wind 8 to 12 mph. Chance of precipitation is 40%.
Chance Light Rain
Hi 72 °F
A chance of rain. Partly sunny, with a high near 72. Northeast wind 8 to 12 mph. Chance of precipitation is 30%.
Chance Light Rain then Chance Rain Showers
Lo 55 °F
A chance of rain before 9pm, then a chance of rain showers. Mostly cloudy, with a low around 55. South wind 8 to 12 mph. Chance of precipitation is 40%.
Issued by:
National Weather Service Boston / Norton, MA
Updated Tue May 14, 2024 1:07pm EDT
000 FXUS61 KBOX 141423 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 1023 AM EDT Tue May 14 2024 .SYNOPSIS... Warm and mainly dry today with some uncertainty regarding how mild Wednesday will be. Heading into a cloudier and unsettled weather pattern for late in the week into the weekend, as a series of slow-moving upper level disturbances move through Southern New England. While it is not likely to be raining the entire period, at least hit or miss showers can't be ruled out at any time. Temperatures for late in the week into the weekend trend slightly cooler than normal on high temperatures and milder than normal on the lows. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 1015 AM Update: *** Pick of the week today *** Previous forecast remains on track when compared to satellite and surface observations. Temps are already off to the races with 68 degs at Norwood! Warm temps aloft (+16C at 925 mb and +11C at 850 mb) will combine with abundant sunshine to support highs around 80 away from the south coast. Highs only in the 60s along the south coast, as SW winds stream across SSTs in the 50s. Speaking of winds, increasing pressure gradient will yield breezy conditions with SW winds 15-25 mph. Already seeing gusts up to 21/22 kt at MVY and HYA. This will also preclude seabreeze development, thus 75-80 highs for the eastern MA coastline from Plymouth county northward to the MA/NH border, including the city of Boston. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/... Showers remain possible for western MA and CT tonight but weak mid level height rises have dampened the signal overnight for any widespread precip. While dewpoint depressions will be quite small, southerly flow overnight should remain brisk enough, between 5-10kt, to keep widespread fog at bay. Lows will bottom out in the mid to even upper 50s region wide, coolest across the Cape. Wednesday's forecast proves to be a bit tricky as low pressure emerges off the mid-Atlantic coast. Overnight guidance took a significant step in the "drier and warmer" direction with low pressure remaining suppressed to our south for much of the day. With mid level ridge still in place, and 925mb temperatures still mild between 13-15C, the temperature forecast will be highly dependent on cloud cover and our mixing potential. Should sunshine break out for a good portion of the morning, it's very possible temps soar into the mid 70s region wide. With that said, anticipating cloud cover will be most robust across the CT River Valley, in part due to an eastward advancing weak boundary, so the warmest temperatures in our region will be across the Merrimack River Valley and across SE MA. Given the rather sudden shift in guidance, heavily weighted the temperatures forecast using NBM, but later forecasters may choose a more aggressive temperatures forecast should a sunnier trend continue. In order to derive warmer temperatures, also trended the PoP and Sky cover forecast in a more favorable (clearer and drier) direction that supports deeper mixing. Shower chances will increase late Wednesday from south to north as the precipitation shield associated with the low is able push across southern RI and the Cape. Again utilized NBM for the QPF forecast. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Highlights: * Unsettled late week into the weekend, although below-average confidence in temps and rain chances in this period. * Won't be raining the whole time, with Fri offering some potential for drier weather, but generally cloudy with periods of at least possible showers. * Seasonable to slightly cooler than normal highs, with milder nighttime lows. Details: Global ensembles point to a generally unsettled and slow-evolving pattern through a large portion of this forecast period. Southern New England's weather looks to be governed by a weakening/filling upper low detached from the westerlies through late in the week, then right on its heels is another shortwave disturbance that is poised to approach and cross our area around the weekend. Unfortunately that's really all that can be said as there is quite a bit of uncertainty as far as the location and progression of these two trough features; thus, below-average forecast confidence in temps, PoP and rain amts in light of this uncertainty in mass field details. Took a pretty broad-stroked brush as far the forecast goes in this period; while most days have some mentionable PoP, it there will likely be periods of dry weather in between and it is not likely we're looking at significant rain amts. With a cloudier-than- not forecast period and a few days of onshore breezes leading to shallower mixing depths, highs were seasonable or slightly cooler than normal and lows were milder than normal. Wednesday Night through Friday: Upper low initially over the OH Valley early Wed night progresses slowly offshore of the NJ coast and deamplifying as it does so; this puts SNE on the northern end of the upper-level circulation. These signals are not typically conducive to significant precip, with the better chances for steadier light rains on Thurs and mainly south of the Mass Pike. I do think the 00z GFS depiction regarding the eastward progression is still too progressive and leaned somewhat toward the slower ECMWF/GEM evolution. With E/SE onshore flow, highs in the upper 50s to low 60s near the coasts with highs well into the 60s; however 850 mb temps are quite warm (around +8 to +10C) and would favor highs several degrees warmer if we can fully mix, but I just don't see that happening. With weakening shortwave ridge axis poking NE into SNE around Fri, that could be a relatively drier day with lower (around 15-20%) PoP indicated for Fri. Highs Fri could reach into the lower to mid 70s in the CT Valley and western MA, with cooler 60s readings the further east one goes. The Weekend into Monday: This latter period perhaps is the most uncertain with guidance struggling with poor congruence both across modeling systems but also from run-to-run. Interaction, if any, between the slowly- exiting late-weekday upper low and an approaching trough from the OH/TN Valleys probably is contributing to that run-to-run disparity. Opted to keep the forecast with a mention of PoP along with a considerable degree of cloud cover, but that will need to be better defined once models show better agreement in timing and placement of key features. While there are some solutions which indicate a dry weekend and favor better rain chances on Monday, it's probably too hasty to lock in that drier outcome just yet. && .AVIATION /14Z TUESDAY THROUGH SATURDAY/... Forecast Confidence Levels: Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. 15Z TAF Update: VFR and increasing SW winds 15-25 kt at times. Dry weather prevails. No change from previous TAFs. Earlier discussion below. --------------------------------------------------------------- Tonight...High confidence. VFR. Scattered showers are possible across northern MA, with at times briefly lower VFR CIGs 3-5k ft. Winds are south to southwest 5 to 10 knots. Today: High confidence. VFR. There could be a spotty SHRA/TS around or west of the Berkshires but unlikely anywhere else in Southern New England. Steady southwest winds with gusts developing in the afternoon 20 to 25 knots. Tonight...High confidence. VFR with lowering cigs to around 4000-5000ft in western MA/CT by daybreak where isolated showers are possible. Winds remain persistent from the S/SW overnight. Wednesday... Moderate Confidence Tricky forecast Wednesday with low pressure to our south, but drier trend has developed. Generally VFR with pockets of MVFR. Isolated shower chances persist for western MA/CT but a mix of sun and clouds for eastern terminals. Showers associated with low pressure will remain south until early evening but may impact Cape/Islands/srn RI terminals by 00Z. S/SW winds shift to the SE. KBOS TAF...High confidence in TAF. VFR. Breezy southwest winds with gusts 20 to 25 knots mitigate sea-breeze potential today. KBDL TAF...High confidence in TAF. Early IFR ceilings should prevail until about 13z before trending VFR. Increasing wind speeds Tuesday with gusts 20 to 25 knots possible. Isolated shower chances late this evening. Outlook /Wednesday Night through Saturday/... Wednesday Night: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA. Thursday: Mainly VFR, with local MVFR possible. Breezy. Chance RA. Thursday Night through Friday: VFR. Breezy. Slight chance RA. Friday Night: Mainly VFR, with local MVFR possible. Breezy. Slight chance RA. Saturday: Mainly VFR, with local IFR possible. Breezy. Chance RA. && .MARINE... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Update: 3 AM Through Wednesday.... S/SW winds persist through Tuesday night before shifting to the SE Wednesday afternoon. Gusts to 25kt possible this afternoon for our far NE waters, though the short fused and small zonal coverage nature of the conditions has prompted us to hold off on a Small Craft Advisory between 15-03Z this evening. Generally dry on today with isolated shower chances for the eastern waters this morning. Shower chances increase for the southern waters late Wednesday as low pressure creeps north from the mid- Atlantic coast. Outlook /Wednesday Night Wednesday Night: Winds less than 25 kt. Local rough seas. Chance of rain showers. Thursday: Winds less than 25 kt. Areas of rough seas. Chance of rain. Thursday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain. Friday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain. Friday Night through Saturday: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. && $$ SYNOPSIS...Loconto/KS NEAR TERM...Nocera SHORT TERM...KS LONG TERM...Loconto AVIATION...Loconto/Nocera/KS MARINE...Loconto/KS
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 7 High
Current (Estimated): 7 High
Note: Rain measured automatically by weather station. Rain totals do not necessarily include melted frozen precipitation.
For more accurate, manually measured rain data, see the Local Precip Data page.
0.00 in
Rain Rate (/hr):
0.00 in
Rain Last 60 min:
0.00 in
Rain Today:
0.00 in
Monday:
1.52 in
May:
25.45 in
2024
2:05pm
82.8°F
High today:
4:15am
50.0°F
Low today:
3:13pm
73.0°F
High Monday:
5:46am
43.2°F
Low Monday:
4:15am
50.0°F
Low wind chill today:
5:46am
43.2°F
Low wind chill Monday:
12:07pm
61.0°F
High dew pt today:
9:51am
53.1°F
High dew pt Monday:
2:04pm
82.7°F
High heat index today:
1:04pm
7 mph
Wind gust today:
2:21pm
9 mph
Wind gust Monday:
No alerts/warnings active for Central Middlesex County.
First Light:
4:52am
Sunrise:
5:24am
Sunset:
7:59pm
Twilight ends:
8:31pm
Daylight length:
14 hours 35 minutes
Phase:
Waxing Crescent (43%)
Moon set:
1:37am
Moon rise:
11:08am