Climate and monthly weather forecastSaint John, WA
Climate and monthly weather forecast
Weather in January
January, the same as December, is an icy winter month in Saint John, Washington, with an average temperature ranging between max 34.5°F (1.4°C) and min 24.6°F (-4.1°C). The shift into January reveals an average high-temperature of a still cold 34.5°F (1.4°C), closely mirroring December's climate. Weather in January »Weather in February
February, the last month of the winter in Saint John, is another cold month, with an average temperature fluctuating between 26.8°F (-2.9°C) and 37.9°F (3.3°C). The transition from January to February brings an average high-temperature of a still icy 37.9°F (3.3°C), barely different from January's 34.5°F (1.4°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Saint John, Washington, with temperature in the range of an average low of 32.7°F (0.4°C) and an average high of 46.9°F (8.3°C). The beginning of March signals a rise in the average high-temperature, moving from a wintry 37.9°F (3.3°C) in February to a frosty 46.9°F (8.3°C). Weather in March »Weather in April
April is a moderate spring month in Saint John, Washington, with an average temperature ranging between min 37.4°F (3°C) and max 55.9°F (13.3°C). With the onset of April, Saint John's average high-temperature experiences a rise, moving from March's frosty 46.9°F (8.3°C) to a moderate 55.9°F (13.3°C). Weather in April »Weather in May
May, the last month of the spring in Saint John, is a refreshing month, with an average temperature varying between 44.2°F (6.8°C) and 65.7°F (18.7°C). Saint John sees an increase in the average high-temperature with the arrival of May, moving from April's refreshing 55.9°F (13.3°C) to an enjoyable 65.7°F (18.7°C). Weather in May »Weather in June
June, the first month of the summer in Saint John, is a pleasant month, with an average temperature fluctuating between 72.1°F (22.3°C) and 49.8°F (9.9°C). Saint John's transition into June sees a mild rise in the average high-temperature, edging from a comfortable 65.7°F (18.7°C) in May to a pleasant 72.1°F (22.3°C). Weather in June »Weather in July
July in Saint John, Washington, is a moderately hot summer month, with an average temperature ranging between max 84.4°F (29.1°C) and min 58.6°F (14.8°C). Saint John's warmest month, July, generally records average temperatures ranging from a high of 84.4°F (29.1°C) to a low of 58.6°F (14.8°C). The heat index in July is estimated at 84.2°F (29°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Saint John, Washington, with temperature in the range of an average high of 83.8°F (28.8°C) and an average low of 61.3°F (16.3°C). At the start of August, Saint John's average high-temperature reaches a still warm 83.8°F (28.8°C), subtly different from the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Saint John, is also an agreeable month, with an average temperature varying between 72.9°F (22.7°C) and 53.2°F (11.8°C). Saint John's transition into September involves a shift in temperature, receding from a warm 83.8°F (28.8°C) in August to a pleasant 72.9°F (22.7°C). Weather in September »Weather in October
October, the same as September, in Saint John, Washington, is another refreshing autumn month, with temperature in the range of an average high of 56.8°F (13.8°C) and an average low of 41.9°F (5.5°C). October brings with it a considerable temperature decrease, with average high-temperatures dropping from September's agreeable 72.9°F (22.7°C) to a moderate 56.8°F (13.8°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Saint John, Washington, with an average temperature ranging between max 43°F (6.1°C) and min 31.8°F (-0.1°C). Saint John in November demonstrates a small temperature transition, adjusting from an average high of a mild 56.8°F (13.8°C) in October to a chilly 43°F (6.1°C). Weather in November »Weather in December
December, the first month of the winter in Saint John, is still a cold month, with temperature in the range of an average low of 23.9°F (-4.5°C) and an average high of 33.1°F (0.6°C). With an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 23.9°F (-4.5°C), December is the coldest month. Weather in December »Updated: Jul 25, 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
The most humid month is January, with an average relative humidity of 87%.
The months with the most rainfall in Saint John are January and May, with an average 0.91" (23mm) of precipitation.
Throughout the year, there are 84.3 rainfall days, and 7.24" (184mm) of precipitation is accumulated.
January through May, September, November and December are months with snowfall in Saint John.
Throughout the year, there are 32.5 snowfall days, and 14.09" (358mm) of snow is accumulated.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the month with the most snowfall. Snow falls for 7.6 days and accumulates 3.82" (97mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
June through August and October are months without snowfall.
June has the longest days of the year, with an average of 15h and 48min of daylight.
July, with average temperatures reaching a high of 84.4°F (29.1°C) and a low of 58.6°F (14.8°C), is the warmest month.
The month with the least rainfall is July, when the rain falls for 3.5 days and typically collects 0.16" (4mm) of precipitation.
The month with the highest UV index is July, with an average maximum UV index of 7.
With an average relative humidity of 36%, August is the least humid month.
The month with the most sunshine is August, with an average of 12.1h of sunshine.
In Saint John, December is the month with the lowest recorded average temperatures, measuring a high of 33.1°F (0.6°C) and a low of 23.9°F (-4.5°C).
The month with the shortest days is December, with an average of 8h and 36min of daylight.
With an average of 4.3h of sunshine, December has the least sunshine of the year.
Average temperature
Saint John, WA
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (33.1°F).
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure
Saint John, WA
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.95"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed
Saint John, WA
- Average wind speed in January:
7.4mph - Average wind speed in February:
7.8mph - Average wind speed in March:
8.8mph - Average wind speed in April:
8.6mph - Average wind speed in May:
7.5mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7mph - Average wind speed in October:
7.4mph - Average wind speed in November:
7.8mph - Average wind speed in December:
7.1mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity
Saint John, WA
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (36%).
Average rainfall
Saint John, WA
- Average rainfall in January:
0.91" - Average rainfall in February:
0.71" - Average rainfall in March:
0.79" - Average rainfall in April:
0.63" - Average rainfall in May:
0.91" - Average rainfall in June:
0.59"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.24" - Average rainfall in September:
0.24" - Average rainfall in October:
0.67" - Average rainfall in November:
0.63" - Average rainfall in December:
0.79"
The wettest months (with the highest rainfall) are January and May (0.91").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Saint John, WA
- Average rainfall days in January:
7.6 days - Average rainfall days in February:
6.2 days - Average rainfall days in March:
10.1 days - Average rainfall days in April:
9.5 days - Average rainfall days in May:
8.6 days - Average rainfall days in June:
7.7 days
- Average rainfall days in July:
3.5 days - Average rainfall days in August:
4 days - Average rainfall days in September:
5.6 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is July (3.5 days).
Average snowfall
Saint John, WA
- Average snowfall in January:
3.7" - Average snowfall in February:
3.82" - Average snowfall in March:
1.26" - Average snowfall in April:
0.71" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and October (0").
Average snowfall days
Saint John, WA
- Average snowfall days in January:
7.4 days - Average snowfall days in February:
7.6 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
1.6 days - Average snowfall days in May:
0.2 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:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
3 days - Average snowfall days in December:
9.3 days
The month with the highest number of snowfall days is December (9.3 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight / Average sunshine
Saint John, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 6min - Average daylight in June:
15h and 48min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 24min - Average daylight in December:
8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January:
4h and 30min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 48min - Average sunshine in April:
9h and 30min - Average sunshine in May:
10h and 36min - Average sunshine in June:
10h and 54min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 6min - Average sunshine in September:
10h and 24min - Average sunshine in October:
6h and 42min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 18min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days
Saint John, WA
- Average sunshine days in January:
17.5 days - Average sunshine days in February:
15.9 days - Average sunshine days in March:
17.5 days - Average sunshine days in April:
18.1 days - Average sunshine days in May:
20.5 days - Average sunshine days in June:
21 days
- Average sunshine days in July:
26.6 days - Average sunshine days in August:
24.3 days - Average sunshine days in September:
23.6 days - Average sunshine days in October:
20.8 days - Average sunshine days in November:
20.3 days - Average sunshine days in December:
19.2 days
The month with the most sunshine days is July (26.6 days).
The month with the least sunshine days is February (15.9 days).
Average UV index
Saint John, WA
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Saint John, WA
The months with the most cloud cover are January and December (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility
Saint John, WA
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
