Climate and monthly weather forecastJava, São Tomé and Príncipe
Climate and monthly weather forecast
The climate of Java
Positioned on the equator in the Gulf of Guinea, São Tomé and Príncipe's island of Java experiences a tropical climate. A distinct feature of this climate type, classified as As under the Köppen climate classification, is the dry 'summer' season with its wet and dry periods.Throughout the year, the average monthly temperatures range within a narrow band from 23°C (73.4°F) to 28.8°C (83.8°F). The difference between the highest average high temperature in January, closely mirroring the climate of the previous month. Java observes a consistent average low-temperature of 27°C (80.6°F) throughout January nights.
In January, the heat index is evaluated at a hot 32°C (89.6°F). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.
Consider that heat index readings are for situations in the shade and light wind. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', offers an insight into how hot it feels when we factor in moisture content. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.In Java, the average relative humidity in January is 77%. In Java, during January, the rain falls for 27.1 days and regularly aggregates up to 130mm (5.12") of precipitation. Throughout the year, there are 241.7 rainfall days, and 1287mm (50.67") of precipitation is accumulated. In January, the average length of the day in Java is 12h and 7min.
On the first day of January in Java, sunrise is at 05:33 and sunset at 17:39. On the last day of the month, sunrise is at 05:43 and sunset at 17:49 GMT. In January, the average sunshine in Java is 8.3h. January through May, October through December, with an average maximum UV index of 7, are months with the highest UV index in Java, São Tomé and Príncipe. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 7 in January converts into the following recommendations:
Ward off overexposure. Defence against solar harm is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Weather in February
In February, the weather in Java, São Tomé and Príncipe, maintains its tropical characteristics. The humid, windy conditions persist from January, but there is a slight increase in wind speed, reaching a maximum of 12.3km/h (7.6mph). Weather in February »Weather in March
As March advances, Java, São Tomé and Príncipe, witnesses a continuation of the tropical climate from the previous month. The distinguishing feature this month is the increase in rainfall, with a total of 119mm (4.69") falling across the city. Weather in March »Weather in April
April in Java, São Tomé and Príncipe, sees a decline in the weather extremes experienced in the first quarter. The winds mildly drop to 11.7km/h (7.3mph) from the previous month. This month marks the transition from the wet to the dry season, and the changes in climatic conditions are observable. Weather in April »Weather in May
Java, São Tomé and Príncipe, experiences a continual drop in climatic extremities through May. In comparison to April, the weather conditions are more stable with a uniform climate pattern. The greatest shift in this month is the increase in wind speed, with gusts reaching 18.5km/h (11.5mph), stirring up the otherwise tranquil atmosphere. Weather in May »Weather in June
June stands apart in the weather calendar of Java, São Tomé and Príncipe, as it sets in the dry season. The amount of rainfall drops significantly, with only 22mm (0.87") recorded throughout the month. In contrast to May, June sees an upsurge in wind speed, hitting a maximum of 18.1km/h (11.2mph). Weather in June »Weather in July
With the onset of July, the dry, windy conditions in Java, São Tomé and Príncipe, persist from June. The wind speed reaches a peak for the year at 18.3km/h (11.4mph). The steady, low rainfall and wind swept landscapes offer a unique charm to the city. Weather in July »Weather in August
Java, São Tomé and Príncipe, in August, is characterized by a humid atmosphere, with the relative humidity reaching 83%. This makes it the most humid month of the year. Despite the increase in humidity, August retains the high winds from July, albeit at a slightly decreased speed. Weather in August »Weather in September
As September unfolds, the weather in Java, São Tomé and Príncipe, commences its transition into the wetter season. This change is evidenced by the rise in rainfall to 35mm (1.38"), from a mere 21mm (0.83") the previous month. Weather in September »Weather in October
The most notable feature of October in Java, São Tomé and Príncipe, is the sharp increase in rainfall. A sum total of 220mm (8.66") of rain is recorded over the city in this month. The wind speed lessens from the highs of the dry season, dropping down to an average of 14.2km/h (8.8mph). Weather in October »Weather in November
November in Java, São Tomé and Príncipe, is dominated by the rainy season. The amount of rainfall reaches its annual peak at 224mm (8.82"). The month witnesses a damp, humid climate, complemented by overcast skies. Despite the high rainfall, the month experiences ample sunshine, brightening up the rain-washed cityscape. Weather in November »Weather in December
December marks the year end in Java, São Tomé and Príncipe, with a steady rainfall of 159mm (6.26"). Despite the decline in rainfall from November, the climate remains wet and humid. The wind speeds reduce to 10.8km/h (6.7mph), making it a calm month compared to the windier, earlier parts of the year. Weather in December »Updated: Feb 5, 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
Throughout the year, in Java, São Tomé and Príncipe, there are 241.7 rainfall days, and 1287mm (50.67") of precipitation is accumulated.
The months with the highest UV index are January through May, October through December, with an average maximum UV index of 7.
With an average of 8.6h of sunshine, February has the most sunshine of the year in Java.
In Java, São Tomé and Príncipe, the peak average temperatures are observed in March, with a high of 28.8°C (83.8°F) and a low of 27.5°C (81.5°F).
March is the least humid month in Java, with an average relative humidity of 76%.
With an average of 12h and 6min of daylight, June has the longest days of the year.
With average temperatures fluctuating between a high of 24.5°C (76.1°F) and a low of 23°C (73.4°F), July stands out as the coldest month in Java.
The month with the least rainfall in Java, São Tomé and Príncipe, is July, when the rain falls for 8.4 days and typically collects 9mm (0.35") of precipitation.
July is the month with the lowest UV index, with an average maximum UV index of 5.
August through October, with an average relative humidity of 83%, are most humid months in Java.
The month with the least sunshine in Java, São Tomé and Príncipe, is August, with an average of 5h of sunshine.
November is the month with the most rainfall in Java, São Tomé and Príncipe. Rain falls for 26.7 days and accumulates 224mm (8.82") of precipitation.
With an average of 12h and 6min of daylight, November has the shortest days of the year.
Java, São Tomé and Príncipe, does not observe Daylight Saving Time (DST). GMT timezone is used throughout the entire year.
Average temperature
Java, São Tomé and Príncipe
The warmest month (with the highest average high temperature) is March (28.8°C).
The month with the lowest average high temperature is July (24.5°C).
The month with the highest average low temperature is March (27.5°C).
The coldest month (with the lowest average low temperature) is July (23°C).
Average pressure
Java, São Tomé and Príncipe
- Average pressure in January:
1010.7mbar - Average pressure in February:
1009.8mbar - Average pressure in March:
1009.9mbar - Average pressure in April:
1010.1mbar - Average pressure in May:
1011.3mbar - Average pressure in June:
1013.5mbar
- Average pressure in July:
1014.3mbar - Average pressure in August:
1014.1mbar - Average pressure in September:
1013.1mbar - Average pressure in October:
1011.4mbar - Average pressure in November:
1010.4mbar - Average pressure in December:
1010.6mbar
The month with the highest atmospheric pressure is July (1014.3mbar).
The month with the lowest atmospheric pressure is February (1009.8mbar).
Average wind speed
Java, São Tomé and Príncipe
- Average wind speed in January:
11.1km/h - Average wind speed in February:
11.6km/h - Average wind speed in March:
11.7km/h - Average wind speed in April:
10.9km/h - Average wind speed in May:
13km/h - Average wind speed in June:
17.6km/h
- Average wind speed in July:
17.7km/h - Average wind speed in August:
17.1km/h - Average wind speed in September:
16.8km/h - Average wind speed in October:
14.2km/h - Average wind speed in November:
12.3km/h - Average wind speed in December:
10.8km/h
The windiest month (with the highest average wind speed) is July (17.7km/h).
The calmest month (with the lowest average wind speed) is December (10.8km/h).
Average humidity
Java, São Tomé and Príncipe
The months with the highest relative humidity are August, September and October (83%).
The month with the lowest relative humidity is March (76%).
Average rainfall
Java, São Tomé and Príncipe
- Average rainfall in January:
130mm - Average rainfall in February:
100mm - Average rainfall in March:
119mm - Average rainfall in April:
126mm - Average rainfall in May:
122mm - Average rainfall in June:
22mm
The wettest month (with the highest rainfall) is November (224mm).
The driest month (with the least rainfall) is July (9mm).
Average rainfall days
Java, São Tomé and Príncipe
- Average rainfall days in January:
27.1 days - Average rainfall days in February:
23.4 days - Average rainfall days in March:
24.4 days - Average rainfall days in April:
22 days - Average rainfall days in May:
20.5 days - Average rainfall days in June:
7.3 days
- Average rainfall days in July:
8.4 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
15.8 days - Average rainfall days in October:
24.7 days - Average rainfall days in November:
26.7 days - Average rainfall days in December:
28.6 days
The month with the highest number of rainy days is December (28.6 days).
The month with the least rainy days is June (7.3 days).
Average daylight / Average sunshine
Java, São Tomé and Príncipe
- Average daylight in January:
12h and 6min - Average daylight in February:
12h and 6min - Average daylight in March:
12h and 6min - Average daylight in April:
12h and 6min - Average daylight in May:
12h and 6min - Average daylight in June:
12h and 6min
- Average daylight in July:
12h and 6min - Average daylight in August:
12h and 6min - Average daylight in September:
12h and 6min - Average daylight in October:
12h and 6min - Average daylight in November:
12h and 6min - Average daylight in December:
12h and 6min
The month with the longest days is June (Average daylight: 12h and 6min).
The month with the shortest days is November (Average daylight: 12h and 6min).
- Average sunshine in January:
8h and 18min - Average sunshine in February:
8h and 36min - Average sunshine in March:
8h and 24min - Average sunshine in April:
8h and 6min - Average sunshine in May:
7h and 36min - Average sunshine in June:
6h and 24min
- Average sunshine in July:
6h and 0min - Average sunshine in August:
5h and 0min - Average sunshine in September:
5h and 24min - Average sunshine in October:
6h and 42min - Average sunshine in November:
7h and 0min - Average sunshine in December:
8h and 12min
The month with the most sunshine is February (Average sunshine: 8h and 36min).
The month with the least sunshine is August (Average sunshine: 5h and 0min).
Average sunshine days
Java, São Tomé and Príncipe
- Average sunshine days in January:
3.1 days - Average sunshine days in February:
3.8 days - Average sunshine days in March:
5.3 days - Average sunshine days in April:
6.2 days - Average sunshine days in May:
9.2 days - Average sunshine days in June:
16.4 days
- Average sunshine days in July:
14.8 days - Average sunshine days in August:
8 days - Average sunshine days in September:
5.3 days - Average sunshine days in October:
2.7 days - Average sunshine days in November:
2 days - Average sunshine days in December:
1.5 days
The month with the most sunshine days is June (16.4 days).
The month with the least sunshine days is December (1.5 days).
Average UV index
Java, São Tomé and Príncipe
The months with the highest UV index are January, February, March, April, May, October, November and December (UV index 7).
The month with the lowest UV index is July (UV index 5).
Average cloud cover
Java, São Tomé and Príncipe
The month with the most cloud cover is August (Cloud cover 65).
The month with the least cloud cover is February (Cloud cover 37).
Average visibility
Java, São Tomé and Príncipe
The months with the highest visibility are January, February, March, April, May, June, July, August, September and December (10km).
The months with the lowest visibility are October and November (9km).
