Climate and monthly weather forecastSan Dimas, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, is another enjoyable winter month in San Dimas, California, with temperature in the range of an average low of 46.9°F (8.3°C) and an average high of 64.9°F (18.3°C). The ushering in of January brings an average high-temperature of a still refreshing 64.9°F (18.3°C), closely mirroring the 62.4°F (16.9°C) of December. Weather in January »Weather in February
The last month of the winter, February, is another refreshing month in San Dimas, California, with an average temperature varying between 64.4°F (18°C) and 45.7°F (7.6°C). San Dimas notes an average high-temperature of a still refreshing 64.4°F (18°C) in February, hardly diverging from January. Weather in February »Weather in March
March, the first month of the spring in San Dimas, is an agreeable month, with an average temperature varying between 47.5°F (8.6°C) and 68.2°F (20.1°C). The transition into March marks the average high-temperature at an agreeable 68.2°F (20.1°C), differing minimally from February's 64.4°F (18°C). Weather in March »Weather in April
April, like March, is another pleasant spring month in San Dimas, California, with temperature in the range of an average high of 72.3°F (22.4°C) and an average low of 50.2°F (10.1°C). San Dimas greets April with an average high-temperature of a still pleasant 72.3°F (22.4°C), marking a slight deviation from the preceding month. Weather in April »Weather in May
May, the last month of the spring in San Dimas, is a warm month, with an average temperature ranging between min 54°F (12.2°C) and max 75.7°F (24.3°C). The weather during May records an average high-temperature of a moderately hot 75.7°F (24.3°C), closely mirroring the preceding month. Weather in May »Weather in June
The first month of the summer, June, is still a warm month in San Dimas, California, with an average temperature ranging between max 82.9°F (28.3°C) and min 57.7°F (14.3°C). A slight uplift of average high-temperatures is noted in June, with temperatures adjusting from a moderately hot 75.7°F (24.3°C) in May to a still warm 82.9°F (28.3°C). Weather in June »Weather in July
July is a hot summer month in San Dimas, California, with temperature in the range of an average high of 88.2°F (31.2°C) and an average low of 63.3°F (17.4°C). The average high-temperature during July registers at a hot 88.2°F (31.2°C), maintaining a close resemblance to the previous month. Weather in July »Weather in August
August, the last month of the summer in San Dimas, is another tropical month, with an average temperature ranging between max 89.4°F (31.9°C) and min 64.9°F (18.3°C). San Dimas records the warmest temperatures in August, averaging a high of 89.4°F (31.9°C) and a low of 64.9°F (18.3°C). The heat index for August is calculated to be a hot 91.4°F (33°C). Weather in August »Weather in September
The first month of the autumn, September, is still a tropical month in San Dimas, California, with an average temperature varying between 63.3°F (17.4°C) and 86.7°F (30.4°C). San Dimas's transition from August to September introduces an average high-temperature of a still tropical 86.7°F (30.4°C), marking an insignificant variation from the 89.4°F (31.9°C). Weather in September »Weather in October
October, the same as September, is a moderately hot autumn month in San Dimas, California, with an average temperature ranging between min 58.1°F (14.5°C) and max 78.3°F (25.7°C). October ushers in a minor alteration in San Dimas's climate, with the average high-temperature moving from September's tropical 86.7°F (30.4°C) to a moderately hot 78.3°F (25.7°C). Weather in October »Weather in November
The last month of the autumn, November, is another pleasant month in San Dimas, California, with an average temperature varying between 70.7°F (21.5°C) and 51.8°F (11°C). San Dimas's progression into November involves a gentle drop in the average high-temperature, from a warm 78.3°F (25.7°C) in October to a pleasant 70.7°F (21.5°C). Weather in November »Weather in December
The first month of the winter, December, is still a refreshing month in San Dimas, California, with temperature in the range of an average high of 62.4°F (16.9°C) and an average low of 45.5°F (7.5°C). The month of December sees the lowest average temperatures, reaching 62.4°F (16.9°C) at the peak and 45.5°F (7.5°C) at the low. Weather in December »Updated: Aug 29, 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
Throughout the year, there are 45.2 rainfall days, and 6.5" (165mm) of precipitation is accumulated.
The months with the least sunshine are January, February and December, with an average of 7h of sunshine.
The month with the most rainfall is February, when the rain falls for 5 days and typically aggregates up to 1.46" (37mm) of precipitation.
March and May, with an average relative humidity of 55%, are most humid months.
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.
The month with the least rainfall is June, when the rain falls for 1.2 days and typically collects 0.04" (1mm) of precipitation.
With an average of 14h and 24min of daylight, June has the longest days of the year.
June and July, with an average of 12.1h of sunshine, are months with the most sunshine.
The months with the highest UV index are July and August, with an average maximum UV index of 7.
August temperatures tend to peak at an average high of 89.4°F (31.9°C) and dip to a low of 64.9°F (18.3°C).
August and November, with an average relative humidity of 45%, are the least humid months in San Dimas.
December, with an average high of 62.4°F (16.9°C) and a low of 45.5°F (7.5°C), signifies the coldest month of the year.
The month with the shortest days is December, with an average of 9h and 54min of daylight.
The month with the lowest UV index is December, with an average maximum UV index of 3.
Average temperature
San Dimas, CA
The warmest month (with the highest average high temperature) is August (89.4°F).
The month with the lowest average high temperature is December (62.4°F).
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure
San Dimas, CA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.9"Hg - Average pressure in August:
29.88"Hg - Average pressure in September:
29.88"Hg - Average pressure in October:
29.94"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 (29.87"Hg).
Average wind speed
San Dimas, CA
- Average wind speed in January:
5.2mph - Average wind speed in February:
4.9mph - Average wind speed in March:
5.1mph - Average wind speed in April:
5.7mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.3mph
- Average wind speed in July:
5mph - Average wind speed in August:
4.7mph - Average wind speed in September:
4.3mph - Average wind speed in October:
4.6mph - Average wind speed in November:
4.8mph - Average wind speed in December:
5.1mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.3mph).
Average humidity
San Dimas, CA
The months with the highest relative humidity are March and May (55%).
The months with the lowest relative humidity are August and November (45%).
Average rainfall
San Dimas, CA
- Average rainfall in January:
1.06" - Average rainfall in February:
1.46" - Average rainfall in March:
0.67" - Average rainfall in April:
0.47" - Average rainfall in May:
0.24" - Average rainfall in June:
0.04"
The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days
San Dimas, CA
- Average rainfall days in January:
4.9 days - Average rainfall days in February:
5 days - Average rainfall days in March:
6.3 days - Average rainfall days in April:
4.8 days - Average rainfall days in May:
3.4 days - Average rainfall days in June:
1.2 days
- Average rainfall days in July:
3.5 days - Average rainfall days in August:
1.8 days - Average rainfall days in September:
2.5 days - Average rainfall days in October:
2.6 days - Average rainfall days in November:
3.5 days - Average rainfall days in December:
5.7 days
The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (1.2 days).
Average daylight / Average sunshine
San Dimas, 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:
14h and 0min - 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:
7h and 0min - Average sunshine in February:
7h and 0min - Average sunshine in March:
9h and 0min - Average sunshine in April:
11h and 24min - Average sunshine in May:
11h and 48min - Average sunshine in June:
12h and 6min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 42min - Average sunshine in October:
8h and 48min - Average sunshine in November:
7h and 18min - Average sunshine in December:
7h and 0min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 7h and 0min).
Average sunshine days
San Dimas, CA
- Average sunshine days in January:
25.1 days - Average sunshine days in February:
22 days - Average sunshine days in March:
24.6 days - Average sunshine days in April:
24.7 days - Average sunshine days in May:
25.9 days - Average sunshine days in June:
27.8 days
- Average sunshine days in July:
25 days - Average sunshine days in August:
26.9 days - Average sunshine days in September:
25.5 days - Average sunshine days in October:
27 days - Average sunshine days in November:
25.8 days - Average sunshine days in December:
23.8 days
The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (22 days).
Average UV index
San Dimas, CA
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover
San Dimas, CA
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility
San Dimas, 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).
