October weather forecast
Riverside, CA

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The neon-lit buildings of Riverside, California, and a silhouette of the high mountain in the back
The neon-lit buildings of Riverside, California, and a silhouette of the high mountain in the back

Weather in October

In October, the transition from summer to fall continues, reflected by a significant decrease in mean temperature. There is also a marked increase in precipitation with rainfall accumulating to 0.2" (5mm). However, despite the onset of fall, the abundance of sunshine and daylight continues to grace Riverside. The cloud cover increases slightly compared to September, completing the transition into cooler months.

Temperature

The arrival of October in Riverside suggests a slight decrease in the average high-temperature, moving from a tropical 88.3°F (31.3°C) in September to a warm 79.5°F (26.4°C). October sees the temperature falling to a mean low of 57.9°F (14.4°C).

Humidity

In Riverside, the average relative humidity in October is 47%.

Rainfall

In October, in Riverside, the rain falls for 2.6 days. Throughout October, 0.2" (5mm) of precipitation is accumulated. Throughout the year, in Riverside, there are 49 rainfall days, and 7.32" (186mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall in Riverside.

Daylight

The average length of the day in October is 11h and 19min.
On the first day of October in Riverside, sunrise is at 6:44 am and sunset at 6:33 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:57 pm PDT.

Sunshine

The average sunshine in October in Riverside is 8.8h.

UV index

In Riverside, the average daily maximum UV index in October is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 5 in October translates into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.

Frequently asked questions

What is the temperature in October in Riverside?

In October, the average high-temperature and low-temperature in Riverside, California, are 79.5°F (26.4°C) and 57.9°F (14.4°C) respectively. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in September is appraised at 89.6°F (32°C).

What is the average humidity in October in Riverside?

In October, the average relative humidity is 47%.

How many days does it rain in October in Riverside?

In October, in Riverside, the rain falls for 2.6 days. Throughout October, 0.2" (5mm) of precipitation is accumulated.

When it does not snow in Riverside?

In Riverside, California, snow does not fall in January, March through December.

What is the average length of the day in October in Riverside?

In October, the average day length is 11h and 19min.

When is the sunrise / sunset in October in Riverside?

In October, on the first day of the month, sunrise is at 6:44 am and sunset at 6:33 pm. On the last day of the month, in Riverside, California, sunrise is at 7:08 am and sunset at 5:57 pm PDT.

How many hours of sunshine does Riverside have in October?

The average sunshine duration in October in Riverside is 8.8h.

How high is the UV index in October in Riverside?

In Riverside, California, the average daily maximum UV index in October is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Riverside, CA

Average temperature in October - Riverside, CA
  • Average high temperature in October: 79.5°F

The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is December (63.3°F).

  • Average low temperature in October: 57.9°F

The month with the highest average low temperature is August (66.4°F).
The coldest month (with the lowest average low temperature) is December (45.9°F).

Average pressure in October
Riverside, CA

Average pressure in October - Riverside, CA
  • Average pressure in October: 29.94"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in October
Riverside, CA

Average wind speed in October - Riverside, CA
  • Average wind speed in October: 4.7mph

The windiest month (with the highest average wind speed) is May (5.6mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

Average humidity in October
Riverside, CA

Average humidity in October - Riverside, CA
  • Average humidity in October: 47%

The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is August (43%).

Average rainfall in October
Riverside, CA

Average rainfall in October - Riverside, CA
  • Average rainfall in October: 0.2"

The wettest months (with the highest rainfall) are February and December (1.61").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in October
Riverside, CA

Average rainfall days in October - Riverside, CA
  • Average rainfall days in October: 2.6 days

The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1.1 days).

Average snowfall days in October
Riverside, CA

Average snowfall days in October - Riverside, CA
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in October /
Average sunshine in October
Riverside, CA

Average daylight in October / Average sunshine in October - Riverside, CA
  • Average daylight in October: 11h and 2min

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 October: 8h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 48min).

Average sunshine days in October
Riverside, CA

Average sunshine days in October - Riverside, CA
  • Average sunshine days in October: 26.3 days

The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (21.6 days).

Average UV index in October
Riverside, CA

Average UV index in October - Riverside, CA
  • Average UV index in October: 5

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 in October
Riverside, CA

Average cloud cover in October - Riverside, CA
  • Average cloud cover in October: 11

The months with the most cloud cover are February and March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in October
Riverside, CA

Average visibility in October - Riverside, CA
  • Average visibility in October: 6mi

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).

Riverside, California, USA

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