Best Time to See Black Widows in California
September, October and August is the best time to see black widows in California. Based on 25,658 verified iNaturalist observations, here is exactly when black widows are most active across the year in California.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Northern Black Widow · Joseph McPhail CC BY
Western Black Widow · Rebecca Ray CC BY
Western Black Widow · Michael Eisen CC BY
25,658 verified observations of black widows in California, recorded across 12 months of the year on iNaturalist.
When black widows are recorded in California
Peak month
September
3,999 records (15.6% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 863 | 3.4% |
| February | 972 | 3.8% |
| March | 1,421 | 5.5% |
| April | 2,194 | 8.6% |
| May | 2,182 | 8.5% |
| June | 2,238 | 8.7% |
| July | 2,692 | 10.5% |
| Augustpeak | 3,141 | 12.2% |
| Septemberpeak | 3,999 | 15.6% |
| Octoberpeak | 3,244 | 12.6% |
| November | 1,766 | 6.9% |
| December | 946 | 3.7% |
Black Widows you are most likely to see
| Species | Verified observations |
|---|---|
| Western Black Widow | 12,643 |
| Brown Widow | 11,427 |
Weather to expect, source Open-Meteo
Typical weather in California
Recent typical conditions by month, so you can plan a trip around both when black widows are active and what the weather is doing. The best months to look for black widows sit around 46 to 93 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 53°F | 31°F | 5.6" |
| Feb | 53°F | 30°F | 4.4" |
| Mar | 55°F | 33°F | 7.3" |
| Apr | 66°F | 40°F | 1.8" |
| May | 73°F | 46°F | 1.6" |
| Jun | 84°F | 55°F | 0.2" |
| Jul | 94°F | 62°F | 0" |
| Augbest time | 93°F | 62°F | 0.3" |
| Sepbest time | 85°F | 57°F | 0.8" |
| Octbest time | 73°F | 46°F | 1.2" |
| Nov | 61°F | 36°F | 2.3" |
| Dec | 53°F | 33°F | 7.8" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for California. Weather varies year to year, so treat these as a guide.
Sightings of black widows in California peak in September, when 3,999 of the year's 25,658 verified observations are logged — about 15.6% of the annual total. Activity stays high through September, October and August.
The quietest stretch is January, December and February, when black widows are hardest to find — January sees just 863 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The black widows you are most likely to encounter in California are Western Black Widow and Brown Widow — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see black widows in California
- Alcatraz Island
- Cabrillo National Monument — National Monument
- Channel Islands National Park — National Park
- Death Valley National Park — National Park
- Devils Postpile National Monument — National Monument
- Golden Gate National Recreation Area — National Recreation Area
Frequently asked questions
What is the best month to see black widows in California?+
September is the single best month, and the broader peak window runs through September, October and August, based on 25,658 verified iNaturalist observations.
When are black widows hardest to see in California?+
January is the quietest month for black widows in California, with only 863 verified records.
Are black widows active year-round in California?+
Black widows are recorded in 12 of 12 months in California, so they can be seen year-round, with a clear peak in September.
More wildlife in California