Climate and monthly weather forecastNiihama, Japan
Climate and monthly weather forecast
Weather in January
January, like December, is another chilly winter month in Niihama, Japan, with an average temperature fluctuating between 7.3°C (45.1°F) and 2°C (35.6°F). January is Niihama's coldest month, registering average high temperatures of 7.3°C (45.1°F) and lows of 2°C (35.6°F). Weather in January »Weather in February
The last month of the winter, February, is another chilly month in Niihama, Japan, with temperature in the range of an average low of 2.7°C (36.9°F) and an average high of 8.3°C (46.9°F). The onset of February marks an average high-temperature of a still frosty 8.3°C (46.9°F), hardly differing from January's 7.3°C (45.1°F). Weather in February »Weather in March
March, the first month of the spring in Niihama, is a cool month, with an average temperature fluctuating between 11.8°C (53.2°F) and 5.1°C (41.2°F). A slight uplift of average high-temperatures is noted in March, with temperatures adjusting from a frosty 8.3°C (46.9°F) in February to a fresh 11.8°C (53.2°F). Weather in March »Weather in April
April is a refreshing spring month in Niihama, Japan, with temperature in the range of an average high of 15.9°C (60.6°F) and an average low of 9.3°C (48.7°F). April brings a slight rise in Niihama's average high-temperature, moving from a cool 11.8°C (53.2°F) in March to a moderate 15.9°C (60.6°F). Weather in April »Weather in May
May, the last month of the spring in Niihama, is an agreeable month, with an average temperature varying between 13.8°C (56.8°F) and 20.8°C (69.4°F). May's arrival sees a mild rise in the average high-temperature, transitioning from April's mild 15.9°C (60.6°F) to a pleasant 20.8°C (69.4°F). Weather in May »Weather in June
June, the first month of the summer in Niihama, is a warm month, with an average temperature ranging between max 23.3°C (73.9°F) and min 17.8°C (64°F). Transitioning into June, Niihama records an average high-temperature of a moderately hot 23.3°C (73.9°F), almost identical to May's 20.8°C (69.4°F). Weather in June »Weather in July
July, like June, in Niihama, Japan, is another warm summer month, with an average temperature varying between 27°C (80.6°F) and 21.9°C (71.4°F). A minor escalation in the average high-temperature is seen with the onset of July, moving from a warm 23.3°C (73.9°F) in June to a still moderately hot 27°C (80.6°F). Weather in July »Weather in August
August, the last month of the summer in Niihama, is another warm month, with an average temperature varying between 28.6°C (83.5°F) and 23.4°C (74.1°F). Temperature readings reach their annual highs in August, averaging 28.6°C (83.5°F) and a minimum average of 23.4°C (74.1°F). For August, the heat index is calculated to be a tropical 34°C (93.2°F). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Niihama, Japan, with an average temperature fluctuating between 19.8°C (67.6°F) and 25.3°C (77.5°F). September signifies a minor drop in average high-temperature, transitioning from a warm 28.6°C (83.5°F) in August to a still moderately hot 25.3°C (77.5°F). Weather in September »Weather in October
October, like September, is an agreeable autumn month in Niihama, Japan, with an average temperature fluctuating between 20.3°C (68.5°F) and 15°C (59°F). October ushers in a slight temperature change, with average high-temperatures reducing from September's warm 25.3°C (77.5°F) to an agreeable 20.3°C (68.5°F). Weather in October »Weather in November
The last month of the autumn, November, is also a moderate month in Niihama, Japan, with temperature in the range of an average high of 14.8°C (58.6°F) and an average low of 9.5°C (49.1°F). The shift from October to November involves a decrease in the average high-temperature, from a pleasant 20.3°C (68.5°F) to a refreshing 14.8°C (58.6°F). Weather in November »Weather in December
December, the first month of the winter in Niihama, is still a chilly month, with an average temperature fluctuating between 9.4°C (48.9°F) and 4.5°C (40.1°F). December's arrival comes with a decrease in the average high-temperature, moving from a refreshing 14.8°C (58.6°F) in November to a frosty 9.4°C (48.9°F). Weather in December »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Niihama, January is known for its average lowest temperatures, reaching a high of 7.3°C (45.1°F) and a low of 2°C (35.6°F).
The month with the least rainfall in Niihama is January, when the rain falls for 11.3 days and typically collects 46mm (1.81") of precipitation.
In Niihama, Japan, during the entire year, the rain falls for 191.4 days and collects up to 1183mm (46.57") of precipitation.
January through March and December are months with snowfall.
In Niihama, during the entire year, snow falls for 17.2 days and aggregates up to 106mm (4.17") of snow.
The months with the least sunshine in Niihama are January and December, with an average of 5.6h of sunshine.
January and December, with an average maximum UV index of 2, are months with the lowest UV index.
The month with the most snowfall in Niihama is February, when snow falls for 4.5 days and typically aggregates up to 40mm (1.57") of snow.
February and March, with an average sea temperature of 15.8°C (60.4°F), are months with the coldest seawater.
The least humid month is March, with an average relative humidity of 72%.
April through November are months without snowfall in Niihama, Japan.
With an average of 14h and 24min of daylight, June has the longest days of the year in Niihama, Japan.
The most humid month in Niihama, Japan, is July, with an average relative humidity of 84%.
The month with the most rainfall in Niihama, Japan, is July, when the rain falls for 23.9 days and typically aggregates up to 187mm (7.36") of precipitation.
The month with the highest UV index is July, with an average maximum UV index of 7.
Niihama's August weather, marked by an average high temperature of 28.6°C (83.5°F) and an average low temperature of 23.4°C (74.1°F), is the warmest in the year.
The month with the warmest seawater is August, with an average sea temperature of 27.5°C (81.5°F).
With an average of 10.7h of sunshine, August has the most sunshine of the year in Niihama.
The month with the shortest days in Niihama, Japan, is December, with an average of 9h and 54min of daylight.
Niihama does not observe Daylight Saving Time (DST). JST timezone is used throughout the entire year.
Average temperature
Niihama, Japan
The warmest month (with the highest average high temperature) is August (28.6°C).
The month with the lowest average high temperature is January (7.3°C).
The month with the highest average low temperature is August (23.4°C).
The coldest month (with the lowest average low temperature) is January (2°C).
Average pressure
Niihama, Japan
- Average pressure in January:
1020.7mbar - Average pressure in February:
1020.4mbar - Average pressure in March:
1018mbar - Average pressure in April:
1015.1mbar - Average pressure in May:
1012.1mbar - Average pressure in June:
1008.5mbar
- Average pressure in July:
1008.9mbar - Average pressure in August:
1009.1mbar - Average pressure in September:
1012.4mbar - Average pressure in October:
1016.7mbar - Average pressure in November:
1019.9mbar - Average pressure in December:
1020.3mbar
The month with the highest atmospheric pressure is January (1020.7mbar).
The month with the lowest atmospheric pressure is June (1008.5mbar).
Average wind speed
Niihama, Japan
- Average wind speed in January:
11.4km/h - Average wind speed in February:
10km/h - Average wind speed in March:
9.9km/h - Average wind speed in April:
8.8km/h - Average wind speed in May:
7.2km/h - Average wind speed in June:
6km/h
- Average wind speed in July:
6.6km/h - Average wind speed in August:
6.5km/h - Average wind speed in September:
7.5km/h - Average wind speed in October:
9km/h - Average wind speed in November:
8.8km/h - Average wind speed in December:
11.3km/h
The windiest month (with the highest average wind speed) is January (11.4km/h).
The calmest month (with the lowest average wind speed) is June (6km/h).
Average humidity
Niihama, Japan
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is March (72%).
Average rainfall
Niihama, Japan
- Average rainfall in January:
46mm - Average rainfall in February:
51mm - Average rainfall in March:
81mm - Average rainfall in April:
92mm - Average rainfall in May:
101mm - Average rainfall in June:
180mm
The wettest month (with the highest rainfall) is July (187mm).
The driest month (with the least rainfall) is January (46mm).
Average rainfall days
Niihama, Japan
- Average rainfall days in January:
11.3 days - Average rainfall days in February:
11.7 days - Average rainfall days in March:
14.4 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
14.1 days - Average rainfall days in June:
20.9 days
- Average rainfall days in July:
23.9 days - Average rainfall days in August:
21.5 days - Average rainfall days in September:
18.1 days - Average rainfall days in October:
15.1 days - Average rainfall days in November:
12.5 days - Average rainfall days in December:
13.6 days
The month with the highest number of rainy days is July (23.9 days).
The month with the least rainy days is January (11.3 days).
Average snowfall
Niihama, Japan
The month with the highest snowfall is February (40mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days
Niihama, Japan
- Average snowfall days in January:
6.6 days - Average snowfall days in February:
4.5 days - Average snowfall days in March:
1.6 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is January (6.6 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature
Niihama, Japan
The best month for swimming (with the highest average sea temperature) is August (27.5°C).
The coldest months (with the lowest average sea temperature) are February and March (15.8°C).
Average daylight / Average sunshine
Niihama, Japan
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
5h and 36min - Average sunshine in February:
5h and 48min - Average sunshine in March:
7h and 42min - Average sunshine in April:
9h and 30min - Average sunshine in May:
10h and 0min - Average sunshine in June:
9h and 6min
- Average sunshine in July:
9h and 36min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 24min - Average sunshine in October:
6h and 6min - Average sunshine in November:
6h and 6min - Average sunshine in December:
5h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days
Niihama, Japan
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
13.4 days - Average sunshine days in March:
13.9 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
15.1 days - Average sunshine days in June:
7.1 days
- Average sunshine days in July:
3.8 days - Average sunshine days in August:
4.3 days - Average sunshine days in September:
7.8 days - Average sunshine days in October:
13.5 days - Average sunshine days in November:
14.2 days - Average sunshine days in December:
11.9 days
The month with the most sunshine days is May (15.1 days).
The month with the least sunshine days is July (3.8 days).
Average UV index
Niihama, Japan
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover
Niihama, Japan
The month with the most cloud cover is June (Cloud cover 41).
The months with the least cloud cover are May and August (Cloud cover 31).
Average visibility
Niihama, Japan
The months with the highest visibility are August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June and July (9km).
