Climate and monthly weather forecast
Foster, RI

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The climate of Foster

Foster, Rhode Island, USA rests under the Köppen climate classification of Cfb, marking it as an area with a marine west coast and warm summer climate. Foster experiences a varied climate throughout the year that sees noticeable fluctuations in temperature, precipitation, and daylight hours.

Seasonal temperature changes in Foster are substantial, with recorded monthly average high temperatures ranging from a mild 33.4°F (0.8°C) in the winter months to a warm 81.1°F (27.3°C) in the height of summer. Respectively, monthly average low temperatures fluctuate from a chilly 21.6°F (-5.8°C) in colder times to 63.1°F (17.3°C) during summer. Humidity levels remain relatively consistent throughout the year, averaging between 73% and 79%.

Rainfall in Foster does not follow a uniform pattern, with the highest average rainfall of 3.43" (87mm) recorded in December and the lowest of 1.81" (46mm) in September. Foster sees precipitation in many forms, with rainfall days varying from 8.3 to a maximum of 17.5 days in any given month, and snowfall ranging from zero about half of the year to a peak of 3.7" (94mm) in March.

The best time to visit Foster

In consideration of the prevailing weather conditions, the ideal period to visit Foster would be between June and August. During these summer months, the average temperatures are at their peak, with highs reaching up to 81.1°F (27.3°C) and lows hovering around a comfortable 63.1°F (17.3°C). Furthermore, daylight hours are extremely generous during this span, with a staggering average of 15.2 hours of daylight in June. Visitors can also expect relatively low wind speeds during these months, ranging from 6mph (9.7km/h) to 6.5mph (10.5km/h).

The worst time to visit Foster

Contrarily, the most unfavorable time to venture to Foster can be considered to be between December and February. Average temperatures during these winter months plummet to lows of 21.6°F (-5.8°C) and highs only reach up to 36.7°F (2.6°C). Daylight is also scarce in this period with just 9.2 to 10.6 hours in these months. Moreover, December records the highest average rainfall of 3.43" (87mm), combined with snowfall peaking at 3.66" (93mm) in February, leading to low visibility and disturbances in outdoor plans.

Spring Weather in Foster

Spring in Foster begins mildly with temperatures in March averaging a high of 43.5°F (6.4°C) and a low of 29.5°F (-1.4°C). As the season progresses to May, the city begins to warm, with high temperatures soaring to a comfortable 66.7°F (19.3°C) and lows leveling at 48.9°F (9.4°C). The frequency of rainfall days is high in Spring, seeing an increase from 11.9 days in March to 16.9 days in May. The occurrence of snowfall in spring is minimal, particularly from April onward.

Summer weather in Foster

Summers in Foster are generally warm and pleasant. June initiates the summer months with an average high temperature of 74.1°F (23.4°C) and a low temperature of around 55.9°F (13.3°C). As summer advances into August, high temperatures slightly increase, reaching up to 79.7°F (26.5°C), with the lows resting at 61.9°F (16.6°C). Rainfall during summer is moderate, with an average of 16.6 to 17.5 rainfall days per month, and no occurrence of snowfall.

Autumn weather in Foster

Autumn brings a cooling trend to Foster. September greets the start of Autumn with high temperatures averaging 72.3°F (22.4°C) and lows averaging 55.4°F (13°C). As November rolls in, the climate becomes considerably cooler with the average high dropping to 49.1°F (9.5°C) and the average low dipping to 36.1°F (2.3°C). Rainfall days see a decrease in frequency during Autumn, going from 14 days in September to 10.5 days in November.

Winter weather in Foster

Winter in Foster is defined by colder temperatures and occasional snowfall. The season starts in December with the high temperature averaging 39.4°F (4.1°C) and the low temperature dropping to 28.8°F (-1.8°C). By February, highs slightly decrease to 36.7°F (2.6°C) with lows around 22.3°F (-5.4°C). Along with the recorded high levels of snowfall and rainfall in December and February, winter weather in Foster can prove challenging for outdoor recreational activities.

Weather in January

The new year commences with chilly temperatures typical for winter in Foster, Rhode Island. January sets the scene with snowflakes, witnessing snowfall spanning 2.91" (74mm) over approximately 7.8 days. The weather can fluctuate between 21.6°F (-5.8°C) and 33.4°F (0.8°C). Weather in January »

Weather in February

As the calendar flips to February, the cold weather persists with no significant change in temperatures from the previous month. The city experiences a slight increase in snowfall, recording an average of 3.66" (93mm). Moving steadily through the winter, the wintry winds touch the rate of 9.2mph (14.8km/h). Weather in February »

Weather in March

The signal of spring begins to ripple through Foster in March. Temperatures start to rise gradually with lows of 29.5°F (-1.4°C) and highs of 43.5°F (6.4°C). Witnessing another 3.7" (94mm) of snowfall, the wintery charm hangs in the air still. Weather in March »

Weather in April

With April comes an evident change in the seasons, welcoming spring in its full glory. Temperatures see a noticeable increase, the weather warming up to highs of 55.6°F (13.1°C). The month marks the melting of snow, accounting for a minimal snowfall of 0.43" (11mm). Weather in April »

Weather in May

May signals the approach of summer with temperatures continuing to climb. Hovering between 48.9°F (9.4°C) to 66.7°F (19.3°C), the mild clime is perfect for al fresco dining or tackling outdoor projects. Snowfall is virtually absent this month, making way for the summer sun to bathe Foster in its warmth. Weather in May »

Weather in June

In June, Foster begins to experience genuine summer weather. The temperatures peak, hitting an average high of 74.1°F (23.4°C). A notable characteristic of June is the 15.2-hour daylight, extended evenings providing more hours to enjoy the summer. Weather in June »

Weather in July

July sees Foster basking in the heart of summer. It is the warmest month, boasting an average high temperature of 81.1°F (27.3°C). The occasional summer storm is usual, contributing to Foster's green landscapes. Gulf breezes temper the warm air, ensuring a sense of balance. Weather in July »

Weather in August

As August rolls in, residents enjoy the lingering summer warmth. Although a slight dip in temperature occurs with a high average of 79.7°F (26.5°C), it still feels unmistakably summery. Experiencing a downfall of 2.83" (72mm) of rainfall, the month guarantees its share of refreshing drizzles. Weather in August »

Weather in September

The fall begins to creep in during September in Foster. Merely hinting at the autumn season, the mercury drops to 72.3°F (22.4°C) for highs and 55.4°F (13°C) for lows. The rainfall also sees a reduced measure of about 1.81" (46mm). Weather in September »

Weather in October

October comes with the true essence of autumn in Foster. The weather undergoes another temperature descent, marking highs of about 60.8°F (16°C) and lows of 46.6°F (8.1°C). Colorful foliage decorates the city, as leaves continue to change and fall. Weather in October »

Weather in November

November is the harbinger of winter in Foster. The winds start picking up pace, with an average speed of 8.3mph (13.4km/h). As the month proceeds, the mercury drops further, plunging to an average high and low of 49.1°F (9.5°C) and 36.1°F (2.3°C), respectively. Weather in November »

Weather in December

December marks the arrival of winter in Foster. The snowfall averages 2.48" (63mm), and the temperatures hover from 28.8°F (-1.8°C) to 39.4°F (4.1°C). An increase in cloudy days and decreased sunshine are usual traits this month. Weather in December »

Frequently asked questions

What are the coldest months?

January, with its high-temperature average of 33.4°F (0.8°C) and a low-temperature average of 21.6°F (-5.8°C), is the coldest month.

How many days does it rain?

In Foster, during the entire year, the rain falls for 163 days and collects up to 33.86" (860mm) of precipitation.

When does it snow?

January through May, November and December are months with snowfall.

How many days does it snow?

Throughout the year, there are 30.6 snowfall days, and 14.02" (356mm) of snow is accumulated.

What is the month with the lowest UV index?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

What are the most humid months?

February, June, July, September and October, with an average relative humidity of 79%, are most humid months.

What is the month with the least sunshine?

The month with the least sunshine is February, with an average of 4.7h of sunshine.

When does it snow the most?

March is the month with the most snowfall. Snow falls for 7.3 days and accumulates 3.7" (94mm) of snow.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month?

April is the least humid month, with an average relative humidity of 73%.

When it does not snow?

In Foster, snow does not fall in June through October.

When are the longest days?

With an average of 15h and 12min of daylight, June has the longest days of the year.

What are the months with the highest UV index?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the warmest month?

In Foster, July records the average highest temperatures, peaking at 81.1°F (27.3°C) and reaching a low of 63.1°F (17.3°C).

What is the month with the most sunshine?

The months with the most sunshine are July and August, with an average of 10.2h of sunshine.

What is the driest month?

September is the month with the least rainfall. Rain falls for 13.6 days and accumulates 1.81" (46mm) of precipitation.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 11.5 days and accumulates 3.43" (87mm) of precipitation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

Average temperature
Foster, RI

Average temperature - Foster, RI

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (33.4°F).

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure
Foster, RI

Average pressure - Foster, RI

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed
Foster, RI

Average wind speed - Foster, RI

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

Average humidity
Foster, RI

Average humidity - Foster, RI

The months with the highest relative humidity are February, June, July, September and October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall
Foster, RI

Average rainfall - Foster, RI

The wettest month (with the highest rainfall) is December (3.43").
The driest month (with the least rainfall) is September (1.81").

Average rainfall days
Foster, RI

Average rainfall days - Foster, RI

The month with the highest number of rainy days is July (17.5 days).
The month with the least rainy days is January (8.3 days).

Average snowfall
Foster, RI

Average snowfall - Foster, RI

The month with the highest snowfall is March (3.7").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days
Foster, RI

Average snowfall days - Foster, RI

The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight / Average sunshine
Foster, RI

Average daylight / Average sunshine - Foster, RI

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days
Foster, RI

Average sunshine days - Foster, RI

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (10.6 days).

Average UV index
Foster, RI

Average UV index - Foster, RI

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average visibility
Foster, RI

Average visibility - Foster, RI

The months with the highest visibility are January, February, March, April, October, November and December (6mi).
The months with the lowest visibility are May, June, July, August and September (5mi).

Foster, Rhode Island, USA

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