Climate and monthly weather forecastWestmont, CA
Climate and monthly weather forecast
Weather in January
January, like December, in Westmont, California, is another comfortable winter month, with temperature in the range of an average high of 65.1°F (18.4°C) and an average low of 52.3°F (11.3°C). The average high-temperature during January registers at a still enjoyable 65.1°F (18.4°C), maintaining a close resemblance to the previous month. Weather in January »Weather in February
The last month of the winter, February, is another refreshing month in Westmont, California, with temperature in the range of an average low of 51.1°F (10.6°C) and an average high of 64.9°F (18.3°C). Westmont observes a minor difference in average high-temperatures between January's 65.1°F (18.4°C) and February's 64.9°F (18.3°C). Weather in February »Weather in March
The first month of the spring, March, is still a refreshing month in Westmont, California, with an average temperature ranging between min 52.7°F (11.5°C) and max 66.6°F (19.2°C). The advent of March signifies a minor shift to an average high-temperature of a still enjoyable 66.6°F (19.2°C), aligning closely with February. Weather in March »Weather in April
April is an agreeable spring month in Westmont, California, with an average temperature varying between 68.9°F (20.5°C) and 54.5°F (12.5°C). The transition into April reveals an average high-temperature of an agreeable 68.9°F (20.5°C), mirroring a close resemblance to March. Weather in April »Weather in May
May, the last month of the spring in Westmont, is also an agreeable month, with temperature in the range of an average high of 70.3°F (21.3°C) and an average low of 56.8°F (13.8°C). May denotes a minimal variation in the average high-temperature to a still pleasant 70.3°F (21.3°C) from April's 68.9°F (20.5°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Westmont, California, with an average temperature varying between 73.4°F (23°C) and 59.4°F (15.2°C). As May turns into June, the average high-temperatures rest at a moderately hot 73.4°F (23°C), showing a minor variation from the prior month. Weather in June »Weather in July
July, like June, in Westmont, California, is a moderately hot summer month, with an average temperature varying between 78.3°F (25.7°C) and 63.3°F (17.4°C). With the onset of July, Westmont's average high-temperature clocks in at a still moderately hot 78.3°F (25.7°C), showing a minor fluctuation from the previous month. Weather in July »Weather in August
August, the last month of the summer in Westmont, is another warm month, with an average temperature ranging between max 80.2°F (26.8°C) and min 64.9°F (18.3°C). August is the month when Westmont's temperatures reach their peak, with averages of 80.2°F (26.8°C) and lows of 64.9°F (18.3°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Westmont, California, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 64.2°F (17.9°C). September reports an average high-temperature of a still warm 79.7°F (26.5°C), slightly varied from August's 80.2°F (26.8°C). Weather in September »Weather in October
October, like September, in Westmont, California, is a moderately hot autumn month, with temperature in the range of an average high of 75.7°F (24.3°C) and an average low of 61.9°F (16.6°C). The average high-temperature during October is a still moderately hot 75.7°F (24.3°C), almost matching the conditions of the preceding month. Weather in October »Weather in November
November, the last month of the autumn in Westmont, is another pleasant month, with an average temperature varying between 70.2°F (21.2°C) and 57.2°F (14°C). November implies a soft temperature shift, with average high-temperatures reducing from October's warm 75.7°F (24.3°C) to an agreeable 70.2°F (21.2°C). Weather in November »Weather in December
The first month of the winter, December, is still a comfortable month in Westmont, California, with an average temperature fluctuating between 64°F (17.8°C) and 51.4°F (10.8°C). December stands out as Westmont's coldest month, with an average high-temperature of 64°F (17.8°C) and a low-temperature of 51.4°F (10.8°C). Weather in December »Updated: Aug 20, 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 month with the most rainfall is January, when the rain falls for 4.3 days and typically aggregates up to 1.42" (36mm) of precipitation.
In Westmont, during the entire year, the rain falls for 47.6 days and collects up to 7.24" (184mm) of precipitation.
January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index.
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.
With an average relative humidity of 70%, June is the most humid month.
June is the month with the least rainfall. Rain falls for 1.7 days and accumulates 0.08" (2mm) of precipitation.
With an average of 14h and 24min of daylight, June has the longest days of the year.
June through September, with an average maximum UV index of 6, are months with the highest UV index.
The months with the most sunshine are July and August, with an average of 11.9h of sunshine.
The warmest period is August, when temperatures fluctuate between an average high of 80.2°F (26.8°C) and a low of 64.9°F (18.3°C).
November is the least humid month, with an average relative humidity of 54%.
The coldest month is December, with an average high-temperature of 64°F (17.8°C) and an average low-temperature of 51.4°F (10.8°C).
The month with the shortest days is December, with an average of 9h and 54min of daylight.
With an average of 6.7h of sunshine, December has the least sunshine of the year.
Average temperature
Westmont, CA
The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (64°F).
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (51.1°F).
Average pressure
Westmont, CA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.9"Hg - Average pressure in October:
29.95"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Westmont, CA
- Average wind speed in January:
5.5mph - Average wind speed in February:
5.6mph - Average wind speed in March:
5.9mph - Average wind speed in April:
6.4mph - Average wind speed in May:
6mph - Average wind speed in June:
5.4mph
- Average wind speed in July:
5.2mph - Average wind speed in August:
5mph - Average wind speed in September:
4.9mph - Average wind speed in October:
5mph - Average wind speed in November:
5.3mph - Average wind speed in December:
5.5mph
The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is September (4.9mph).
Average humidity
Westmont, CA
The month with the highest relative humidity is June (70%).
The month with the lowest relative humidity is November (54%).
Average rainfall
Westmont, CA
- Average rainfall in January:
1.42" - Average rainfall in February:
1.3" - Average rainfall in March:
1.02" - Average rainfall in April:
0.39" - Average rainfall in May:
0.24" - Average rainfall in June:
0.08"
- Average rainfall in July:
0.28" - Average rainfall in August:
0.16" - Average rainfall in September:
0.24" - Average rainfall in October:
0.24" - Average rainfall in November:
0.59" - Average rainfall in December:
1.3"
The wettest month (with the highest rainfall) is January (1.42").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days
Westmont, CA
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
5 days - Average rainfall days in March:
6.5 days - Average rainfall days in April:
4.5 days - Average rainfall days in May:
4.4 days - Average rainfall days in June:
1.7 days
- Average rainfall days in July:
3.4 days - Average rainfall days in August:
2.5 days - Average rainfall days in September:
3.2 days - Average rainfall days in October:
3.4 days - Average rainfall days in November:
3.7 days - Average rainfall days in December:
5 days
The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.7 days).
Average daylight / Average sunshine
Westmont, CA
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
6h and 48min - Average sunshine in February:
6h and 48min - Average sunshine in March:
8h and 48min - Average sunshine in April:
10h and 54min - Average sunshine in May:
11h and 6min - Average sunshine in June:
11h and 36min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 54min - Average sunshine in September:
10h and 30min - Average sunshine in October:
8h and 24min - Average sunshine in November:
7h and 6min - Average sunshine in December:
6h and 42min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days
Westmont, CA
- Average sunshine days in January:
25.3 days - Average sunshine days in February:
21.6 days - Average sunshine days in March:
24.1 days - Average sunshine days in April:
24.1 days - Average sunshine days in May:
23.6 days - Average sunshine days in June:
21.4 days
- Average sunshine days in July:
23.9 days - Average sunshine days in August:
25.4 days - Average sunshine days in September:
23.4 days - Average sunshine days in October:
25.5 days - Average sunshine days in November:
25.1 days - Average sunshine days in December:
24.8 days
The month with the most sunshine days is October (25.5 days).
The month with the least sunshine days is June (21.4 days).
Average UV index
Westmont, CA
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover
Westmont, CA
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility
Westmont, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
