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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January in Saint Helena, California, is a refreshing winter month, with an average temperature varying between 56.8°F (13.8°C) and 39.7°F (4.3°C). The shift into January reveals an average high-temperature of a moderate 56.8°F (13.8°C), closely mirroring December's climate. Weather in January »
Weather in February
The last month of the winter, February, is also a moderate month in Saint Helena, California, with an average temperature fluctuating between 39.7°F (4.3°C) and 59.2°F (15.1°C). As Saint Helena welcomes February, the average high-temperature is noted at a still mild 59.2°F (15.1°C), closely aligning with the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Saint Helena, is a refreshing month, with an average temperature varying between 40.5°F (4.7°C) and 61.5°F (16.4°C). March's average high-temperature is a comfortable 61.5°F (16.4°C), maintaining a close comparison with February's 59.2°F (15.1°C). Weather in March »
Weather in April
April in Saint Helena, California, is an agreeable spring month, with an average temperature fluctuating between 43.2°F (6.2°C) and 68°F (20°C). As Saint Helena enters April, the average high-temperature marginally increases from the an enjoyable 61.5°F (16.4°C) of March to a pleasant 68°F (20°C). Weather in April »
Weather in May
The last month of the spring, May, is a warm month in Saint Helena, California, with an average temperature varying between 46.9°F (8.3°C) and 74.1°F (23.4°C). May sees a marginal temperature increase, moving from an agreeable 68°F (20°C) in April to a warm 74.1°F (23.4°C). Weather in May »
Weather in June
The first month of the summer, June, is also a moderately hot month in Saint Helena, California, with temperature in the range of an average low of 52.5°F (11.4°C) and an average high of 83.8°F (28.8°C). In Saint Helena, the onset of June comes with an increased average high-temperature, moving from May's 74.1°F (23.4°C) to a still warm 83.8°F (28.8°C). Weather in June »
Weather in July
July in Saint Helena, California, is a tropical summer month, with temperature in the range of an average low of 53.8°F (12.1°C) and an average high of 88.3°F (31.3°C). July is the month when Saint Helena sees the highest average temperatures, with a high of 88.3°F (31.3°C) and a low of 53.8°F (12.1°C). The heat index value during July is calculated to be a tropical 93.2°F (34°C). Weather in July »
Weather in August
The last month of the summer, August, is another tropical month in Saint Helena, California, with an average temperature ranging between max 88°F (31.1°C) and min 54.1°F (12.3°C). Saint Helena marks the onset of August with an average high-temperature of a still hot 88°F (31.1°C), subtly divergent from July's 88.3°F (31.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Saint Helena, California, with an average temperature varying between 85.3°F (29.6°C) and 54.3°F (12.4°C). As Saint Helena steps into September, the average high-temperature holds at a warm 85.3°F (29.6°C), hinting at a minor fluctuation from the prior month. Weather in September »
Weather in October
October, the same as September, is a moderately hot autumn month in Saint Helena, California, with an average temperature ranging between min 50.9°F (10.5°C) and max 75°F (23.9°C). In October, the meteorological conditions alter, with the average high-temperature shifting from 85.3°F (29.6°C) in September to a still warm 75°F (23.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Saint Helena, is another comfortable month, with an average temperature varying between 44.1°F (6.7°C) and 63.5°F (17.5°C). November involves a decrease in temperature, down from a moderately hot 75°F (23.9°C) in October to a refreshing 63.5°F (17.5°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cool month in Saint Helena, California, with an average temperature ranging between max 54.5°F (12.5°C) and min 39.6°F (4.2°C). The coldest time of the year is December, with temperatures averaging a high of 54.5°F (12.5°C) and a low of 39.6°F (4.2°C). Weather in December »
[Resources]Frequently asked questions
How many days does it rain in Saint Helena?
In Saint Helena, during the entire year, the rain falls for 76.2 days and collects up to 16.93" (430mm) of precipitation.
When it does not snow in Saint Helena?
January, February, April through December are months without snowfall.
How much does it snow in Saint Helena?
In Saint Helena, California, during the entire year, snow aggregates up to 0.04" (1mm).
What is the month with the lowest UV index in Saint Helena?
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
What is the rainiest month in Saint Helena?
February is the month with the most rainfall in Saint Helena. Rain falls for 9.3 days and accumulates 3.7" (94mm) of precipitation.
What is the most humid month in Saint Helena?
March is the most humid month in Saint Helena, with an average relative humidity of 76%.
When does it snow in Saint Helena?
March is the only month when snow falls in Saint Helena, California.
What is the snowiest month in Saint Helena?
The month with the most snowfall in Saint Helena, California, is March, when snow falls for 0.2 days and typically aggregates up to 0.04" (1mm) of snow.
When is Daylight Saving Time (DST) in Saint Helena?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Saint Helena, California, 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.
When are the longest days in Saint Helena?
With an average of 14h and 48min of daylight, June has the longest days of the year in Saint Helena, California.
What are the months with the highest UV index in Saint Helena?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Saint Helena.
What are the warmest months in Saint Helena?
In Saint Helena, the peak average temperatures are observed in July, with a high of 88.3°F (31.3°C) and a low of 53.8°F (12.1°C).
What is the driest month in Saint Helena?
The only month without rainfall is July.
What month has the most sunshine in Saint Helena?
July has the most sunshine of the year, with an average of 11.9h of sunshine.
When does it rain in Saint Helena?
Months with rainfall in Saint Helena are January through June, August through December.
What is the least humid month in Saint Helena?
The least humid month in Saint Helena is September, with an average relative humidity of 53%.
What is the coldest month in Saint Helena?
With average high and low temperatures of 54.5°F (12.5°C) and 39.6°F (4.2°C) respectively, December is Saint Helena's coldest month.
What is the month with the shortest days in Saint Helena?
With an average of 9h and 30min of daylight, December has the shortest days of the year in Saint Helena.
What is the month with the least sunshine in Saint Helena?
With an average of 5.3h of sunshine, December has the least sunshine of the year.
Average temperature
Saint Helena, CA
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (54.5°F).
The month with the highest average low temperature is September (54.3°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).
Average pressure
Saint Helena, CA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.91"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).
Average wind speed
Saint Helena, CA
- Average wind speed in January:
4.5mph - Average wind speed in February:
5.2mph - Average wind speed in March:
5.3mph - Average wind speed in April:
5.7mph - Average wind speed in May:
5.8mph - Average wind speed in June:
5.6mph
- Average wind speed in July:
5.2mph - Average wind speed in August:
4.7mph - Average wind speed in September:
4.6mph - Average wind speed in October:
4.6mph - Average wind speed in November:
4.3mph - Average wind speed in December:
4.6mph
The windiest month (with the highest average wind speed) is May (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity
Saint Helena, CA
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (53%).
Average rainfall
Saint Helena, CA
- Average rainfall in January:
3.15" - Average rainfall in February:
3.7" - Average rainfall in March:
2.64" - Average rainfall in April:
0.87" - Average rainfall in May:
0.87" - Average rainfall in June:
0.12"
The wettest month (with the highest rainfall) is February (3.7").
The driest month (with the least rainfall) is July (0").
Average rainfall days
Saint Helena, CA
- Average rainfall days in January:
10.2 days - Average rainfall days in February:
9.3 days - Average rainfall days in March:
13.5 days - Average rainfall days in April:
9 days - Average rainfall days in May:
5.7 days - Average rainfall days in June:
2 days
- Average rainfall days in July:
0.8 days - Average rainfall days in August:
0.3 days - Average rainfall days in September:
2 days - Average rainfall days in October:
4.7 days - Average rainfall days in November:
7.4 days - Average rainfall days in December:
11.3 days
The month with the highest number of rainy days is March (13.5 days).
The month with the least rainy days is August (0.3 days).
Average snowfall
Saint Helena, CA
The month with the highest snowfall is March (0.04").
The months with the least snowfall are January, February, April, May, June, July, August, September, October, November and December (0").
Average snowfall days
Saint Helena, CA
- Average snowfall days in January:
0 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0.2 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:
0 days
The month with the highest number of snowfall days is March (0.2 days).
The months with the least snowfall days are January, February, April, May, June, July, August, September, October, November and December (0 days).
Average daylight / Average sunshine
Saint Helena, CA
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 2min - Average sunshine in February:
5h and 4min - Average sunshine in March:
7h and 0min - Average sunshine in April:
9h and 3min - Average sunshine in May:
10h and 1min - Average sunshine in June:
11h and 3min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 5min - Average sunshine in September:
11h and 0min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 1min - Average sunshine in December:
5h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days
Saint Helena, CA
- Average sunshine days in January:
19.9 days - Average sunshine days in February:
18.2 days - Average sunshine days in March:
15.9 days - Average sunshine days in April:
20.2 days - Average sunshine days in May:
24.2 days - Average sunshine days in June:
27.3 days
- Average sunshine days in July:
30 days - Average sunshine days in August:
29.8 days - Average sunshine days in September:
27.5 days - Average sunshine days in October:
25.8 days - Average sunshine days in November:
22.1 days - Average sunshine days in December:
19.1 days
The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (15.9 days).
Average UV index
Saint Helena, CA
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, November and December (UV index 3).
Average cloud cover
Saint Helena, CA
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility
Saint Helena, CA
The months with the highest visibility are February, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and March (5mi).
Saint Helena, California, USA
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