Grantham, NH Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Grantham, NH.

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Current Conditions — Grantham, NH

LEBANON (KLEB)

Cloudy

60.8 F
Humidity:%
Wind Speed:W 3.4 mph
Barometer:29.88 in
Dewpoint: F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
May 10 2026, 01:15 PM EDT
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5-Day Forecast — Grantham, NH

Sunday

High 66 °F
Chance of T-storms
Sunday
Night
Low 32 °F
Partly Cloudy
Monday

High 59 °F
Mostly Cloudy
Monday
Night
Low 35 °F
Slight Chance of Showers
Tuesday

High 57 °F
Partly Sunny
Tuesday
Night
Low 37 °F
Partly Cloudy
Wednesday

High 59 °F
Rain Showers
Wednesday
Night
Low 42 °F
Rain
Thursday

High 59 °F
T-storms

Detailed Forecast — Grantham, NH

Sunday
Chance of Thunderstorms. High near 66°F. Wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Partly Cloudy. Low around 32°F. Wind 2 to 6 mph, with gusts as high as 12 mph.
Monday
Mostly Cloudy. High near 59°F. Wind 2 to 7 mph, with gusts as high as 14 mph.
Monday Night
Slight Chance of Showers. Low around 35°F. Wind around 3 mph, with gusts as high as 7 mph.
Tuesday
Partly Sunny. High near 57°F. Wind 5 to 7 mph, with gusts as high as 14 mph.
Tuesday Night
Partly Cloudy. Low around 37°F. Wind 0 to 2 mph, with gusts as high as 5 mph.
Wednesday
Rain Showers. High near 59°F. Wind 2 to 7 mph, with gusts as high as 14 mph.
Wednesday Night
Rain. Low around 42°F. Wind 6 to 7 mph, with gusts as high as 14 mph.
Thursday
Thunderstorms. High near 59°F. Wind 6 to 7 mph, with gusts as high as 14 mph.
Thursday Night
Rain. Low around 44°F. Wind 5 to 6 mph, with gusts as high as 12 mph.
Friday
Rain Showers Likely. High near 62°F. Wind 6 to 7 mph, with gusts as high as 14 mph.
Friday Night
Chance of Rain Showers. Low around 46°F. Wind around 3 mph, with gusts as high as 7 mph.
Saturday
Chance of Rain Showers. High near 69°F. Wind 3 to 7 mph, with gusts as high as 14 mph.
NH Radar
Current Radar • NH
Day 1 Outlook • May 10, 2026

Observation History — Grantham, NH

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
01:15 PM EDT W 3.4 10.00 Cloudy -- 60.8 % NA NA 29.88 1011.9
01:00 PM EDT 0.0 3.00 Light Rain and Fog/Mist -- 57.2 % NA NA 29.89 1012.2
12:50 PM EDT 0.0 7.00 Light Rain -- 59.0 % NA NA 29.88 1011.9
12:45 PM EDT SW 3.4 10.00 Cloudy -- 59.0 % NA NA 29.88 1011.9
12:25 PM EDT 4.6 10.00 Light Rain -- 57.2 % NA NA 29.88 1011.9
12:20 PM EDT S 6.9 9.00 Light Rain -- 57.2 % NA NA 29.88 1011.9
12:10 PM EDT 4.6 10.00 Light Rain -- 57.2 % NA NA 29.88 1011.9
12:05 PM EDT 5.7 10.00 Light Rain -- 57.2 % NA NA 29.88 1011.9
11:55 AM EDT 4.6 10.00 Cloudy -- 57.2 % NA NA 29.88 1011.9
11:50 AM EDT S 4.6 10.00 Light Rain -- 57.2 % NA NA 29.87 1011.5
11:35 AM EDT 8.1 3.00 Rain -- 57.2 % NA NA 29.88 1011.9
11:20 AM EDT 9.2 10.00 Cloudy -- 60.8 % NA NA 29.87 1011.5
11:10 AM EDT 8.1 10.00 Cloudy -- 60.8 % NA NA 29.86 1011.2
11:00 AM EDT S 10.4 10.00 Cloudy -- 60.8 % NA NA 29.85 1010.8
10:50 AM EDT S 8.1 10.00 Mostly Cloudy -- 59.0 % NA NA 29.85 1010.8
10:35 AM EDT S 8.1 10.00 Mostly Cloudy -- 59.0 % NA NA 29.86 1011.2
10:25 AM EDT S 11.5 10.00 Mostly Cloudy -- 59.0 % NA NA 29.86 1011.2
10:15 AM EDT S 11.5 10.00 Mostly Cloudy -- 59.0 % NA NA 29.86 1011.2
10:05 AM EDT 10.4 10.00 Mostly Cloudy -- 57.2 % NA NA 29.86 1011.2
09:50 AM EDT S 11.5 10.00 Cloudy -- 57.2 % NA NA 29.87 1011.5
09:45 AM EDT G 19.6 10.00 Cloudy -- 57.2 % NA NA 29.87 1011.5
09:40 AM EDT 10.00 Cloudy -- 57.2 % NA NA 29.87 1011.5
09:35 AM EDT S 12.7 10.00 Cloudy -- 57.2 % NA NA 29.87 1011.5
09:25 AM EDT 10.00 Cloudy -- 55.4 % NA NA 29.87 1011.5

Regional Weather Observation

LEBANON (KLEB)

Cloudy
60.8 F

SPRINGFIELD (KVSF)

Mostly Cloudy
64.4 F

RUTLAND STATE (KRUT)

Cloudy
55.4 F

PLYMOUTH (K1P1)

Cloudy
54.5 F

MONTPELIER/BARRE (KMPV)

Mostly Cloudy
57.2 F

LACONIA MUNI (KLCI)

Mostly Cloudy
57.2 F
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