New Hampshire Weather by Month — Temperature & Rainfall Guide

New Hampshire is a region in the United States of America. Many people wonder what the weather conditions are in New Hampshire over the year. What is the best time to visit New Hampshire?

This page shows the average weather conditions by month in New Hampshire over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in New Hampshire is generally less favorable. January is a winter month. The average maximum daytime temperatures are very low and range from -4°C (25°F) in Waterville Valley to 2°C (36°F) in Salem. On average, this month is one of the coldest months of the year in New Hampshire. So be prepared and make sure to dress up warm.

Find more detailed climate information for New Hampshire in January here.

In February the weather in New Hampshire is generally less favorable. February is a winter month. The temperatures range from very low in Waterville Valley with -3°C (27°F) to low in Salem with 3°C (37°F). It is a very cold month in some areas, so be prepared and make sure to dress up warm.

Find more detailed climate information for New Hampshire in February here.

In March the weather in New Hampshire is generally less favorable. The average maximum daytime temperatures are low and range from 2°C (36°F) in Waterville Valley to 8°C (46°F) in Salem.

Find more detailed climate information for New Hampshire in March here.

In April the weather in New Hampshire ranges from less favorable in Portsmouth to good in Nashua. The temperatures range from low in Waterville Valley with 10°C (50°F) to moderate in Nashua with 15°C (59°F).

Find more detailed climate information for New Hampshire in April here.

In May the weather in New Hampshire ranges from good in Portsmouth to excellent in Nashua. The temperatures range from moderate in Waterville Valley with 17°C (63°F) to pleasant in Nashua with 21°C (70°F).

Find more detailed climate information for New Hampshire in May here.

In June the weather in New Hampshire is generally very good. June is a summer month. The temperatures range from pleasant in Waterville Valley with 21°C (70°F) to high in Nashua with 25°C (77°F).

Find more detailed climate information for New Hampshire in June here.

In July the weather in New Hampshire ranges from very good in Portsmouth to excellent in Nashua. July is a summer month. The average maximum daytime temperatures are high and range from 24°C (75°F) in Waterville Valley to 29°C (84°F) in Nashua. On average, this month is one of the warmest months of the year in New Hampshire. So be prepared and make sure to dress lightly.

Find more detailed climate information for New Hampshire in July here.

In August the weather in New Hampshire ranges from very good in Portsmouth to excellent in Salem. August is a summer month. The average maximum daytime temperatures are high and range from 23°C (73°F) in Waterville Valley to 28°C (82°F) in Nashua.

Find more detailed climate information for New Hampshire in August here.

In September the weather in New Hampshire ranges from very good in Keene to excellent in Portsmouth. The temperatures range from pleasant in Waterville Valley with 19°C (66°F) to high in Nashua with 24°C (75°F).

Find more detailed climate information for New Hampshire in September here.

In October the weather in New Hampshire is generally mixed. The average maximum daytime temperatures are moderate and range from 12°C (54°F) in Waterville Valley to 17°C (63°F) in Salem.

Find more detailed climate information for New Hampshire in October here.

In November the weather in New Hampshire ranges from less favorable in Portsmouth to mixed in Nashua. The average maximum daytime temperatures are low and range from 6°C (43°F) in Waterville Valley to 11°C (52°F) in Salem.

Find more detailed climate information for New Hampshire in November here.

In December the weather in New Hampshire is generally less favorable. December is a winter month. The temperatures range from very low in Waterville Valley with -1°C (30°F) to low in Salem with 5°C (41°F). It is a very cold month in some areas, so be prepared and make sure to dress up warm.

Find more detailed climate information for New Hampshire in December here.