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Grantham, NH Weather
Current conditions
Observed at Lebanon Municipal Airport · 46 min ago
Forecast
10-day-
Today
Sunny, with a high near 55. Northeast wind 0 to 5 mph.
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Tonight
Mostly cloudy, with a low around 33. North wind 0 to 5 mph.
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Thursday
Mostly sunny, with a high near 56. North wind 5 to 15 mph, with gusts as high as 25 mph.
National Weather Service forecast updated 10 hrs ago.
Hourly
Hourly forecast- Now53°
- 6 PM50°
- 7 PM46°
- 8 PM40°
- 9 PM38°
- 10 PM37°
- 11 PM37°
- Thu12 AM36°
- 1 AM35°
- 2 AM34°
- 3 AM34°
- 4 AM34°
- 5 AM34°
- 6 AM34°
- 7 AM34°
- 8 AM34°
- 9 AM38°
- 10 AM44°
- 11 AM49°
- 12 PM53°
- 1 PM55°
- 2 PM56°
- 3 PM56°
- 4 PM55°
10-day forecast
Details- TodayOct 21Sunny33°55°
- ThuOct 22Mostly Sunny29°56°
- FriOct 23Sunny26°50°
- SatOct 24Sunny28°55°
- SunOct 25Sunny36°61°
- MonOct 26Mostly Sunny36°61°
- TueOct 27Partly Sunny30°53°
- WedOct 28Cloudy31°50°
- ThuOct 29Mostly sunny0.02 in37°61°
- FriOct 30Rain0.09 in51°60°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news in New Hampshire
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Air quality
Forecast
- WedGood
- ThuGood
Sullivan County, NH reporting area. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyHanover, records since 1893. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
Forecasters' discussion
From the National Weather Service office in GYX, issued 2 hrs ago
What Has Changed
No significant changes other than lowering forecast lows by a few degrees for tonight.
Key Messages
1. High pressure remains in control of the weather pattern across northern New England through the weekend while an ocean storm passes offshore. Northerly gusts of 30 to 35 MPH possible later Thursday into Friday.
Discussion
KEY MESSAGE 1 DESCRIPTION...
It will continue to be a pleasant late afternoon and evening across the region with temperatures quickly cooling after sunset. Cirrus will gradually increase from south to north tonight from a nor'easter passing to the SE of Cape Cod. Given that cirrus typically does not have a big impact on radiational cooling and that dew points are low, went ahead and lowered NBM forecast lows by a few degrees. This cools some interior valleys into the 20s/lower 30s with middle to upper 30s elsewhere. The warmest readings will be along the coast as mixing will likely linger longer into the night.
High pressure will remain over southern Quebec on Thursday into Thursday night as a dry cold front crosses from the north and low pressure passes well offshore. Partly to mostly sunny skies will prevail with highs into the lower 60s south of the mtns with 50s across the north. The increasing pressure gradient force from the offshore low and high centered to our NW will allow for increasing winds throughout the day with N gusts up to 30-35 mph likely from Thursday afternoon through the first half of Friday.
Upper low/nor'easter will continue to move northeast, well out to sea. With persistent northerly flow aloft, expect a chilly and blustery day on Friday with highs mainly in the mid 40s to mid 50s. The gusty winds will make it feel even colder.
As winds diminish Friday night, a mostly clear sky should prove optimal for radiational cooling and very cold temperatures. The latest NBM is advertising lows in the 20s across the entire forecast area and this may end up being on the warm side depending on the presence of high clouds.
High pressure then dominates the weather pattern through the weekend as an upper level ridge nudges into the region. This will lead to a gradual warmup through the weekend and into next week. Highs on Saturday should mainly be back in the 50s with some 60s returning Sunday and Monday. A cold front will sweep through on Monday which will lead to cooler temperatures into midweek. As of now, this cold front looks to be dry but we could end up seeing some low precipitation chances as we move closer in time.
Aviation
Through Thursday: Patchy fog is possible in the river valleys tonight into Thursday morning. Otherwise, VFR conditions prevail with N winds of 10-15 kts. Gusts will increase late Thursday through the first half of Friday with gusts up to 30 kts.
Outlook...
Thursday: Mostly VFR. Northwest winds may gust 20-30 kt.
Thursday night-Monday...VFR prevails. Northerly gusts up to 30 kt Thursday night into Friday morning.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.