Climate and monthly weather forecastRota, Northern Mariana Islands, USA
Climate and monthly weather forecast
The climate of Rota
Rota inhabits a climatic zone classified under the Köppen climate system as a tropical rainforest, with geographical coordinates within the Northern Mariana Islands in the USA. Weather conditions in Rota maintain a steady temperature range from 75°F (23.9°C) to 88°F (31.1°C) throughout the year, signaling a relatively consistent tropical environment.Varying monthly averages reveal slight deviations in the overall weather patterns. Rainfall levels oscillate from 3.5" (89mm) during March to a substantial rise of 14.4" (366mm) in August. The number of days with rainfall also follow a similar dynamic, reaching a peak count of 23 days in August and maintaining around 20 days for the remainder of the months.
Simultaneously, Rota's exposure to daylight fluctuates from an 11.3 hour low in December to a peak of 13 hours in May and June. Despite this, the monthly average sunshine duration doesn't deviate significantly, hovering around a steady 5-7 hours daily. Another noteworthy aspect is the UV index, which exhibits strong solar radiation levels ranging from 9 in December to 12 between February and September.
The best time to visit Rota
With a tropical rainforest climate, there isn't a dramatic shift between seasons in Rota, but an ideal period for visiting can be singled out. The months of March and April present a desirable balance between weather conditions. Temperatures sit comfortably between 75°F (23.9°C) to 88°F (31.1°C). Rainfalls occur less frequently, averaging 3.5" (89mm) to 3.9" (99mm) compared to other months. Daily sunlight extends to 12.1 hours, further accentuated by the sea's welcoming temperature of 81°F (27.2°C) to 82°F (27.8°C).The worst time to visit Rota
The period from July to October poses some challenges for travelers in Rota. This is the peak of the rainfall season, with the precipitation level peaking to 14.4" (366mm) in August. Across these months, there are approximately 21 to 23 rainy days. Despite temperatures being stable, the increased rainfall, coupled with the highest UV index of 12, might cause inconvenience for outdoor activities.Spring weather in Rota
During Rota's spring months from March to May, the island reveals contrasting weather patterns. In March, precipitation levels decrease to a yearly low of 3.5" (89mm) occurring over 20 days. As spring progresses, the amounts of rainfall steadily increase, reaching 5.4" (137mm) over 20 days in May. Despite the escalation in precipitation, spring witnesses a rise in daylight hours from 12.1 hours in March to 12.8 hours in May.Summer weather in Rota
Rota’s summer months, from June to August, bring about a combination of warm temperatures, lengthy days, and abundant rainfall. Peak temperatures maintain an equilibrium at 88°F (31.1°C), while an upshot of 13 hours of daylight graces June. However, this period marks tropical rainfall, which escalates to its annual zenith of 14.4" (366mm) in August.Autumn weather in Rota
Autumn in Rota spans from September to November. Temperature fluctuations are minimal during this period, with the mercury staying between 77°F (25°C) and 88°F (31.1°C). Despite diminishing daylight hours, from 12.2 hours in September to 11.5 hours in November, downpours persist throughout autumn. Rainfall levels reach 13.6" (345mm) in September and reduce to 8.9" (226mm) in November.Winter weather in Rota
Winter runs from December to February in Rota. The lowest temperatures are recorded during these months, falling to 75°F (23.9°C). Yet, winter heat does not drop significantly, with the maximum temperature remaining at 84°F (28.9°C) to 86°F (30°C). Despite shorter daylight of 11.3 hours to 11.7 hours and a slight decrease in rainfall, observation shows rainfall at 5 to 5.7" (145mm) over approximately 22 days per month.Weather in January
January's weather in Rota, Northern Mariana Islands, USA, tends to be fairly consistent with what is to be expected in a tropical climate. The constant temperatures combined with the high probability of rainfall create a humid environment for the island. Weather in January »Weather in February
With February arrives a slight decrease in rainfall to an average of 4.4" (112mm), indicating a milder wetness than January in Rota. The month is characterized by a subtle increase in daylight hours, allowing more time to explore the beauty of the Northern Mariana Islands. Weather in February »Weather in March
Moving into March, Rota endures a further reduction in rainfall, settling at an average 3.5" (89mm) spread across approximately 20 days. Weather characteristics in March generally mirror those in February, including stable sea temperatures and high UV indexes. Weather in March »Weather in April
April mirrors March's typical climate, with a slight uptick in rainfall translating to averages of 3.9" (99mm). As Rota transitions into the latter half of the year, the daylight hours extend further, offering more opportunities for outdoor pursuits. Weather in April »Weather in May
May signals a shift towards the wetter part of the year, as rainfall averages increase to 5.4" (137mm). Daylight hours reach near-peak duration in May, coupled with consistently warm sea temperatures that encourage water-based pursuits. Weather in May »Weather in June
June brings with it the highest average sea temperatures of the year, maintaining a tropical climate for Rota. The marked increase in rainfall to 6.2" (157mm) compares with the rise seen in May, continuing the trend towards the wet season. Weather in June »Weather in July
Rota's weather in July is characterized by the year’s peak rainfall, standing at an average of 10.7" (272mm). The island's atmosphere sustains its tropical flair with warm sea temperatures and extended daylight hours. July is the beginning of the high season for rainfall, heralding the start of frequent and heavy showers. Weather in July »Weather in August
August introduces the highest amount of rainfall for the entire year, averaging at 14.4" (366mm). This trend of increased precipitation continues from July, taking advantage of long daylight hours. The sea retains its warm temperature, still inviting to those looking for aquatic activities on the island. Weather in August »Weather in September
September signifies the continuation of the rainy season with rainfall averages of 13.6" (345mm). The combination of shorter daylight hours and reduced sunshine hours compared to previous months points to a gradual transition towards less sunny days. Weather in September »Weather in October
October presents relatively less rainfall, averaging at 12.5" (318mm), offering a slight relief from the heavier showers over the past three months in Rota. The diminishing daylight hours coupled with the shortest sunshine duration suggest a shift towards the year's end. Weather in October »Weather in November
November ushers in a noticeable reduction in rainfall to an average of 8.9" (226mm), signaling the start of the transition out of the traditional wet season. The continuity of warm sea temperatures and high UV indexes persists, coupled with further decline in daylight hours. Weather in November »Weather in December
December continues the trend from November, with reduced average rainfall of 5.7" (145mm) indicating a return to conditions seen at the beginning of the year. The sea temperatures start to come down subtly, although they remain relatively warm for aquatic activities in Rota. Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, with its high-temperature average of 84.2°F (29°C) and a low-temperature average of 75.2°F (24°C), is the coldest month.
Throughout the year, in Rota, there are 247 rainfall days, and 94.29" (2395mm) of precipitation is accumulated.
February and March, with an average ocean temperature of 80.6°F (27°C), are months with the coldest seawater in Rota, Northern Mariana Islands.
February through September, with an average maximum UV index of 12, are months with the highest UV index in Rota.
The month with the least rainfall in Rota is March, when the rain falls for 20 days and typically collects 3.46" (88mm) of precipitation.
March through June, with an average of 7h of sunshine, are months with the most sunshine.
Temperatures in Rota, Northern Mariana Islands, reach their maximum during April through November, recording an average high-temperature of 87.8°F (31°C).
June through November, with an average ocean temperature of 84.2°F (29°C), are months with the warmest seawater in Rota, Northern Mariana Islands.
June has the longest days of the year, with an average of 12h and 54min of daylight.
The month with the most rainfall is August, when the rain falls for 23 days and typically aggregates up to 14.37" (365mm) of precipitation.
With an average of 4h of sunshine, October has the least sunshine of the year.
With an average of 11h and 18min of daylight, December has the shortest days of the year in Rota, Northern Mariana Islands.
Rota does not observe Daylight Saving Time (DST). ChST timezone is used over the entire year.
December is the month with the lowest UV index in Rota, Northern Mariana Islands, with an average maximum UV index of 9.
Average temperature
Rota, Northern Mariana Islands, USA
The warmest months (with the highest average high temperature) are April, May, June, July, August, September, October and November (88°F).
The month with the lowest average high temperature is January (84°F).
The months with the highest average low temperature are May, June, July, August, September, October and November (77°F).
The coldest months (with the lowest average low temperature) are January, February, March, April and December (75°F).
Average rainfall
Rota, Northern Mariana Islands, USA
The wettest month (with the highest rainfall) is August (14.4").
The driest month (with the least rainfall) is March (3.5").
Average rainfall days
Rota, Northern Mariana Islands, USA
- Average rainfall days in January:
22 days - Average rainfall days in February:
19 days - Average rainfall days in March:
20 days - Average rainfall days in April:
18 days - Average rainfall days in May:
20 days - Average rainfall days in June:
19 days
- Average rainfall days in July:
21 days - Average rainfall days in August:
23 days - Average rainfall days in September:
20 days - Average rainfall days in October:
22 days - Average rainfall days in November:
21 days - Average rainfall days in December:
22 days
The month with the highest number of rainy days is August (23 days).
The month with the least rainy days is April (18 days).
Average sea temperature
Rota, Northern Mariana Islands, USA
The best months for swimming (with the highest average sea temperature) are June, July, August, September, October and November (84°F).
The coldest months (with the lowest average sea temperature) are February and March (81°F).
Average daylight / Average sunshine
Rota, Northern Mariana Islands, USA
- Average daylight in January:
11h and 24min - Average daylight in February:
11h and 42min - Average daylight in March:
12h and 6min - Average daylight in April:
12h and 30min - Average daylight in May:
12h and 48min - Average daylight in June:
12h and 54min
- Average daylight in July:
12h and 54min - Average daylight in August:
12h and 36min - Average daylight in September:
12h and 12min - Average daylight in October:
11h and 48min - Average daylight in November:
11h and 30min - Average daylight in December:
11h and 18min
The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).
The months with the most sunshine are March, April, May and June (Average sunshine: 7h).
The month with the least sunshine is October (Average sunshine: 4h).
Average UV index
Rota, Northern Mariana Islands, USA
The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).
