Climate and monthly weather forecastSimi Valley, CA
Climate and monthly weather forecast
Weather in January
January is an enjoyable winter month in Simi Valley, California, with an average temperature fluctuating between 47.3°F (8.5°C) and 61.3°F (16.3°C). The onset of January brings with it an average high-temperature of an enjoyable 61.3°F (16.3°C), showing a negligible variation from the month before. Weather in January »Weather in February
The last month of the winter, February, is another refreshing month in Simi Valley, California, with an average temperature ranging between min 46.6°F (8.1°C) and max 60.6°F (15.9°C). During February, the average high-temperature is a still refreshing 60.6°F (15.9°C), maintaining a close resemblance to that of the preceding month. Weather in February »Weather in March
The first month of the spring, March, is an enjoyable month in Simi Valley, California, with an average temperature ranging between min 47.8°F (8.8°C) and max 63.3°F (17.4°C). March's presence marks an average high-temperature of a comfortable 63.3°F (17.4°C), subtly varied from February's 60.6°F (15.9°C). Weather in March »Weather in April
April, like March, in Simi Valley, California, is another enjoyable spring month, with an average temperature fluctuating between 66.7°F (19.3°C) and 50.4°F (10.2°C). Simi Valley, California, records an average high-temperature of a still comfortable 66.7°F (19.3°C) as April arrives, nearly mirroring the previous month's climate. Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Simi Valley, California, with temperature in the range of an average high of 70.2°F (21.2°C) and an average low of 53.4°F (11.9°C). The start of May marks an average high-temperature of a pleasant 70.2°F (21.2°C), hardly distinguishable from the conditions in April. Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Simi Valley, California, with an average temperature varying between 75.6°F (24.2°C) and 57.7°F (14.3°C). The onset of June introduces a subtle rise in the average high-temperature, nudging from an agreeable 70.2°F (21.2°C) in May to a moderately hot 75.6°F (24.2°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Simi Valley, California, with an average temperature fluctuating between 61.9°F (16.6°C) and 80.8°F (27.1°C). July's average high-temperature stands at a still moderately hot 80.8°F (27.1°C), showing little deviation from June's 75.6°F (24.2°C). Weather in July »Weather in August
August, the last month of the summer in Simi Valley, is another warm month, with an average temperature fluctuating between 82.2°F (27.9°C) and 63.1°F (17.3°C). August is the warmest month, with the temperature often reaching an average high of 82.2°F (27.9°C) and an average low of 63.1°F (17.3°C). The average heat index in August is calculated to be 84.2°F (29°C). Weather in August »Weather in September
September, the first month of the autumn in Simi Valley, is still a warm month, with temperature in the range of an average low of 62.1°F (16.7°C) and an average high of 79.7°F (26.5°C). During September, the average high-temperature is a still warm 79.7°F (26.5°C), maintaining a close resemblance to that of the preceding month. Weather in September »Weather in October
October, the same as September, is a moderately hot autumn month in Simi Valley, California, with an average temperature fluctuating between 74.1°F (23.4°C) and 57.6°F (14.2°C). As Simi Valley enters October, the average high-temperature subtly lowers from the 79.7°F (26.5°C) of September to a still warm 74.1°F (23.4°C). Weather in October »Weather in November
The last month of the autumn, November, is also an enjoyable month in Simi Valley, California, with temperature in the range of an average high of 67.5°F (19.7°C) and an average low of 51.8°F (11°C). November's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from October's warm 74.1°F (23.4°C) to a refreshing 67.5°F (19.7°C). Weather in November »Weather in December
The first month of the winter, December, is also a moderate month in Simi Valley, California, with an average temperature varying between 46.4°F (8°C) and 60.1°F (15.6°C). In Simi Valley, December is the month with the lowest recorded average temperatures, measuring a high of 60.1°F (15.6°C) and a low of 46.4°F (8°C). Weather in December »Updated: Aug 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
In Simi Valley, during the entire year, the rain falls for 53.7 days and collects up to 9.61" (244mm) of precipitation.
January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine.
February is the month with the most rainfall. Rain falls for 5.8 days and accumulates 1.93" (49mm) of precipitation.
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 is the most humid month, with an average relative humidity of 62%.
The month with the least rainfall in Simi Valley is June, when the rain falls for 1.5 days and typically collects 0.08" (2mm) of precipitation.
June has the longest days of the year, with an average of 14h and 24min of daylight.
The months with the most sunshine are June and July, with an average of 12.1h of sunshine.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
August proves to be the warmest month, recording an average peak temperature of 82.2°F (27.9°C) and a minimum temperature of 63.1°F (17.3°C).
The least humid month in Simi Valley is November, with an average relative humidity of 50%.
Simi Valley's coldest month, December, generally records average temperatures ranging from a high of 60.1°F (15.6°C) to a low of 46.4°F (8°C).
December has the shortest days of the year, 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
Simi Valley, CA
The warmest month (with the highest average high temperature) is August (82.2°F).
The month with the lowest average high temperature is December (60.1°F).
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (46.4°F).
Average pressure
Simi Valley, CA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.9"Hg - Average pressure in October:
29.96"Hg - Average pressure in November:
30.04"Hg - Average pressure in December:
30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).
Average wind speed
Simi Valley, CA
- Average wind speed in January:
6.4mph - Average wind speed in February:
6.2mph - Average wind speed in March:
6mph - Average wind speed in April:
6.2mph - Average wind speed in May:
5.5mph - Average wind speed in June:
4.8mph
- Average wind speed in July:
4.6mph - Average wind speed in August:
4.3mph - Average wind speed in September:
4.5mph - Average wind speed in October:
5.5mph - Average wind speed in November:
6.1mph - Average wind speed in December:
6.5mph
The windiest month (with the highest average wind speed) is December (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity
Simi Valley, CA
The month with the highest relative humidity is June (62%).
The month with the lowest relative humidity is November (50%).
Average rainfall
Simi Valley, CA
- Average rainfall in January:
1.89" - Average rainfall in February:
1.93" - Average rainfall in March:
1.5" - Average rainfall in April:
0.63" - Average rainfall in May:
0.35" - Average rainfall in June:
0.08"
- Average rainfall in July:
0.24" - Average rainfall in August:
0.12" - Average rainfall in September:
0.2" - Average rainfall in October:
0.31" - Average rainfall in November:
0.67" - Average rainfall in December:
1.69"
The wettest month (with the highest rainfall) is February (1.93").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days
Simi Valley, CA
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
8 days - Average rainfall days in April:
6.2 days - Average rainfall days in May:
4.5 days - Average rainfall days in June:
1.5 days
- Average rainfall days in July:
3.7 days - Average rainfall days in August:
1.5 days - Average rainfall days in September:
2.7 days - Average rainfall days in October:
3.5 days - Average rainfall days in November:
4.3 days - Average rainfall days in December:
6.4 days
The month with the highest number of rainy days is March (8 days).
The months with the least rainy days are June and August (1.5 days).
Average daylight / Average sunshine
Simi Valley, 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:
6h and 48min - Average sunshine in February:
6h and 48min - Average sunshine in March:
8h and 48min - Average sunshine in April:
11h and 0min - Average sunshine in May:
11h and 30min - 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 54min - Average sunshine in October:
8h and 24min - Average sunshine in November:
7h and 18min - Average sunshine in December:
6h and 48min
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: 6h and 48min).
Average sunshine days
Simi Valley, CA
- Average sunshine days in January:
23.9 days - Average sunshine days in February:
20.9 days - Average sunshine days in March:
21.5 days - Average sunshine days in April:
22.9 days - Average sunshine days in May:
23.2 days - Average sunshine days in June:
23.8 days
- Average sunshine days in July:
23.3 days - Average sunshine days in August:
25.4 days - Average sunshine days in September:
23.5 days - Average sunshine days in October:
25.3 days - Average sunshine days in November:
24.3 days - Average sunshine days in December:
23.2 days
The month with the most sunshine days is August (25.4 days).
The month with the least sunshine days is February (20.9 days).
Average UV index
Simi Valley, CA
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover
Simi Valley, CA
The month with the most cloud cover is March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility
Simi Valley, 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).
