Grantham, NH Weather Forecast
Local 7-day forecast
Rain Showers Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Grantham, NH in one place.
Rain showers likely and patchy fog before 5am, then areas of fog and a chance of rain showers. Cloudy, with a low around 54. South wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Local Weather Overview
This forecast page for Grantham, NH is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 16, 2026 4:14 AM EDT.
The active forecast window currently covers Apr 16 to Apr 22, 2026 for Grantham, NH.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 16 to Apr 22, 2026
- Latest sync
- Apr 16, 2026 4:14 AM EDT
- Forecast office
- GYX
- Source
- NOAA / NWS
Daily Outlook
This Week in Grantham
Thursday looks like the warmest upcoming period in Grantham at 70 degrees F.
Monday Night is the coolest period ahead with temperatures near 25 degrees F.
The strongest winds are forecast for Monday at about 10 to 15 mph NW.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 16, 2026 4:14 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- GYX
- Radar station
- KCXX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain showers and patchy fog before 11am, then a chance of showers and thunderstorms between 11am and 5pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 70. South wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
A chance of showers and thunderstorms before 8pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 55. South wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
A chance of rain showers before 11am, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 65. Northwest wind around 5 mph. Chance of precipitation is 50%.
A chance of rain showers before 10pm. Mostly cloudy, with a low around 48. Northeast wind around 5 mph. Chance of precipitation is 40%.
Mostly cloudy, with a high near 59.
A chance of rain showers after 10pm. Mostly cloudy, with a low around 44. Chance of precipitation is 40%.
Rain showers likely. Cloudy, with a high near 52. Chance of precipitation is 70%.
Rain showers likely before 8pm, then a chance of rain and snow showers. Mostly cloudy, with a low around 29. Chance of precipitation is 60%.
A slight chance of snow showers before 1pm. Partly sunny, with a high near 38.
Partly cloudy, with a low around 25.
Sunny, with a high near 49.
A slight chance of rain showers between 9pm and 11pm, then a slight chance of rain and snow showers. Mostly cloudy, with a low around 37.
A slight chance of rain and snow showers. Partly sunny, with a high near 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Apr 16
|
Rain Showers Likely
|
54°F |
5 mph
S
|
|
Thursday
Apr 16
|
Chance Showers And Thunderstorms
|
70°F |
5 to 10 mph
S
|
|
Thursday Night
Apr 16
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
55°F |
5 mph
S
|
|
Friday
Apr 17
|
Chance Showers And Thunderstorms
|
65°F |
5 mph
NW
|
|
Friday Night
Apr 17
|
Chance Rain Showers then Mostly Cloudy
|
48°F |
5 mph
NE
|
|
Saturday
Apr 18
|
Mostly Cloudy
|
59°F |
5 to 10 mph
E
|
|
Saturday Night
Apr 18
|
Chance Rain Showers
|
44°F |
10 mph
SE
|
|
Sunday
Apr 19
|
Rain Showers Likely
|
52°F |
10 mph
SW
|
|
Sunday Night
Apr 19
|
Chance Rain And Snow Showers
|
29°F |
10 mph
W
|
|
Monday
Apr 20
|
Slight Chance Snow Showers
|
38°F |
10 to 15 mph
NW
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
25°F |
10 mph
NW
|
|
Tuesday
Apr 21
|
Sunny
|
49°F |
10 mph
W
|
|
Tuesday Night
Apr 21
|
Slight Chance Rain And Snow Showers
|
37°F |
5 to 10 mph
SW
|
|
Wednesday
Apr 22
|
Slight Chance Rain And Snow Showers
|
54°F |
5 to 10 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grantham.
