Eureka weather in July
In July, Eureka sees average daytime highs of 60°F and overnight lows near 53°F, with 0.1 in of rain across 0.8 wet days and about 14.6 hours of daylight. It is the 3rd-warmest and 12th-wettest month of the year here.
Day-to-day highs hold fairly steady near 60°F through the month. The sky is clear or mostly clear about 51% of the time in July, and the air most often feels dry.
Daylight stretches from about 14 h 54 min at the start of July to 14 h 12 min by month's end. Set against the rest of the year, July is Eureka's 2nd-clearest and 9th-windiest month. For the whole year in context, see Eureka's year-round climate.
- Daytime high
- 60°
- 3rd warmest
- Overnight low
- 53°
- 10th coldest
- Rainfall
- 0.1 in
- 0.8 wet days
- Daylight
- 14 h 42 min
- 5:03 AM – 7:42 PM
- Cloud cover
- 39%
- 2nd clearest
- Wind
- 8 mph
- 9th windiest
- Solar energy
- 7.66 kWh/m²
- Travel score
- 6.0
- out of 10
Eureka is city in and county seat of Humboldt County, California, United States.
- Density
- 722/km²
- people per km²
- Founded
- 1850
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Day-to-day highs hold fairly steady near 60°F through the month.
A typical July day in Eureka reaches about 60°F in the afternoon and slips back to 53°F overnight — a 6°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 63°F. Set against its neighbours, July runs about 2°F warmer than June and on par with August.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
| Avg low (°F) | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 59 | 53 |
| 2 | 59 | 53 |
| 3 | 59 | 53 |
| 4 | 59 | 53 |
| 5 | 59 | 53 |
| 6 | 59 | 53 |
| 7 | 59 | 53 |
| 8 | 59 | 53 |
| 9 | 59 | 53 |
| 10 | 59 | 53 |
| 11 | 59 | 53 |
| 12 | 59 | 53 |
| 13 | 59 | 53 |
| 14 | 60 | 53 |
| 15 | 60 | 53 |
| 16 | 60 | 53 |
| 17 | 60 | 53 |
| 18 | 60 | 54 |
| 19 | 60 | 54 |
| 20 | 60 | 54 |
| 21 | 60 | 54 |
| 22 | 60 | 54 |
| 23 | 60 | 54 |
| 24 | 60 | 54 |
| 25 | 60 | 54 |
| 26 | 60 | 54 |
| 27 | 60 | 54 |
| 28 | 60 | 54 |
| 29 | 60 | 54 |
| 30 | 60 | 54 |
| 31 | 60 | 54 |
Eureka weather by month
How July compares with the rest of the year at a glance. July is the 3rd-warmest and 12th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 53° / 46° | 8.0 | 15.3 | 9.4 | 2.6 |
| Feb | 53° / 46° | 6.7 | 13.4 | 10.4 | 2.6 |
| Mar | 53° / 47° | 7.0 | 14.7 | 11.7 | 2.6 |
| Apr | 53° / 48° | 4.1 | 11.8 | 13.1 | 3.0 |
| May | 55° / 50° | 2.1 | 7 | 14.2 | 3.9 |
| Jun | 57° / 52° | 0.9 | 3.7 | 14.9 | 4.9 |
| Jul | 60° / 53° | 0.1 | 0.8 | 14.6 | 6.0 |
| Aug | 61° / 54° | 0.2 | 0.9 | 13.6 | 6.3 |
| Sep | 61° / 54° | 0.6 | 2.3 | 12.3 | 6.3 |
| Oct | 59° / 52° | 2.9 | 6.3 | 10.9 | 5.1 |
| Nov | 55° / 49° | 5.7 | 12.5 | 9.7 | 3.3 |
| Dec | 53° / 47° | 9.6 | 15.6 | 9.1 | 2.6 |
Cloud cover in July
The sky is clear or mostly clear about 51% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 20% of July, with mostly cloudy or overcast conditions the remaining 29%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 70 | 70 | 71 | 71 | 71 | 72 | 72 | 72 | 72 | 72 | 71 | 71 | 71 | 71 | 71 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 71 | 71 | 71 | 70 | 69 | 69 | 68 | 68 | 66 |
| Cloudier (%) | 30 | 30 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 30 | 31 | 31 | 32 | 32 | 34 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 70 | 30 |
| 2 | 70 | 30 |
| 3 | 71 | 29 |
| 4 | 71 | 29 |
| 5 | 71 | 29 |
| 6 | 72 | 28 |
| 7 | 72 | 28 |
| 8 | 72 | 28 |
| 9 | 72 | 28 |
| 10 | 72 | 28 |
| 11 | 71 | 29 |
| 12 | 71 | 29 |
| 13 | 71 | 29 |
| 14 | 71 | 29 |
| 15 | 71 | 29 |
| 16 | 72 | 28 |
| 17 | 72 | 28 |
| 18 | 72 | 28 |
| 19 | 72 | 28 |
| 20 | 72 | 28 |
| 21 | 72 | 28 |
| 22 | 72 | 28 |
| 23 | 71 | 29 |
| 24 | 71 | 29 |
| 25 | 71 | 29 |
| 26 | 70 | 30 |
| 27 | 69 | 31 |
| 28 | 69 | 31 |
| 29 | 68 | 32 |
| 30 | 68 | 32 |
| 31 | 66 | 34 |
Chance of precipitation in July
Eureka gets around 0.1 in of rain over 0.8 wet days in July, the driest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 3% and peaks near 6% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 6 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 |
| Rain chance (%) | |
|---|---|
| 1 | 6 |
| 2 | 6 |
| 3 | 6 |
| 4 | 5 |
| 5 | 5 |
| 6 | 5 |
| 7 | 4 |
| 8 | 4 |
| 9 | 4 |
| 10 | 4 |
| 11 | 4 |
| 12 | 4 |
| 13 | 4 |
| 14 | 4 |
| 15 | 4 |
| 16 | 3 |
| 17 | 3 |
| 18 | 3 |
| 19 | 3 |
| 20 | 3 |
| 21 | 3 |
| 22 | 2 |
| 23 | 2 |
| 24 | 2 |
| 25 | 2 |
| 26 | 2 |
| 27 | 2 |
| 28 | 2 |
| 29 | 1 |
| 30 | 1 |
| 31 | 1 |
Humidity in July
Most of July feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the dry band about 83% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 89 | 88 | 87 | 87 | 86 | 86 | 85 | 84 | 84 | 83 | 82 | 82 | 81 | 81 | 80 | 80 | 80 | 80 | 80 | 80 | 81 | 82 | 82 | 83 | 83 | 84 | 84 | 84 | 84 | 84 | 83 |
| Comfortable (%) | 11 | 12 | 13 | 13 | 14 | 14 | 15 | 16 | 16 | 17 | 18 | 18 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 17 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 89 | 11 |
| 2 | 88 | 12 |
| 3 | 87 | 13 |
| 4 | 87 | 13 |
| 5 | 86 | 14 |
| 6 | 86 | 14 |
| 7 | 85 | 15 |
| 8 | 84 | 16 |
| 9 | 84 | 16 |
| 10 | 83 | 17 |
| 11 | 82 | 18 |
| 12 | 82 | 18 |
| 13 | 81 | 19 |
| 14 | 81 | 19 |
| 15 | 80 | 20 |
| 16 | 80 | 20 |
| 17 | 80 | 20 |
| 18 | 80 | 20 |
| 19 | 80 | 20 |
| 20 | 80 | 20 |
| 21 | 81 | 19 |
| 22 | 82 | 18 |
| 23 | 82 | 18 |
| 24 | 83 | 17 |
| 25 | 83 | 17 |
| 26 | 84 | 16 |
| 27 | 84 | 16 |
| 28 | 84 | 16 |
| 29 | 84 | 16 |
| 30 | 84 | 16 |
| 31 | 83 | 17 |
Wind in July
Winds average 8 mph in July.
Across July, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 9 | light breeze |
| 2 | 9 | light breeze |
| 3 | 9 | light breeze |
| 4 | 9 | light breeze |
| 5 | 9 | light breeze |
| 6 | 9 | light breeze |
| 7 | 9 | light breeze |
| 8 | 9 | light breeze |
| 9 | 9 | light breeze |
| 10 | 8 | light breeze |
| 11 | 8 | light breeze |
| 12 | 8 | light breeze |
| 13 | 8 | light breeze |
| 14 | 8 | light breeze |
| 15 | 8 | light breeze |
| 16 | 8 | light breeze |
| 17 | 8 | light breeze |
| 18 | 8 | light breeze |
| 19 | 8 | light breeze |
| 20 | 8 | light breeze |
| 21 | 8 | light breeze |
| 22 | 8 | light breeze |
| 23 | 8 | light breeze |
| 24 | 8 | light breeze |
| 25 | 8 | light breeze |
| 26 | 8 | light breeze |
| 27 | 8 | light breeze |
| 28 | 8 | light breeze |
| 29 | 8 | light breeze |
| 30 | 8 | light breeze |
| 31 | 8 | light breeze |
Sunrise & sunset in July
Daylight runs from about 14 h 54 min at the start of July to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 42 minutes over July. Sunrise moves from 4:53 AM to 5:16 AM, and sunset from 7:47 PM to 7:30 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.9 | 14.9 | 14.9 | 14.9 | 14.9 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.7 | 14.7 | 14.7 | 14.7 | 14.7 | 14.6 | 14.6 | 14.6 | 14.6 | 14.5 | 14.5 | 14.5 | 14.5 | 14.4 | 14.4 | 14.4 | 14.3 | 14.3 | 14.3 | 14.2 |
| Sunrise (AM) | 4:53 | 4:54 | 4:54 | 4:55 | 4:55 | 4:56 | 4:56 | 4:57 | 4:58 | 4:58 | 4:59 | 5:00 | 5:00 | 5:01 | 5:02 | 5:03 | 5:03 | 5:04 | 5:05 | 5:06 | 5:07 | 5:07 | 5:08 | 5:09 | 5:10 | 5:11 | 5:12 | 5:13 | 5:14 | 5:15 | 5:16 |
| Sunset (PM) | 7:47 | 7:47 | 7:47 | 7:46 | 7:46 | 7:46 | 7:46 | 7:46 | 7:45 | 7:45 | 7:44 | 7:44 | 7:44 | 7:43 | 7:43 | 7:42 | 7:41 | 7:41 | 7:40 | 7:39 | 7:39 | 7:38 | 7:37 | 7:36 | 7:36 | 7:35 | 7:34 | 7:33 | 7:32 | 7:31 | 7:30 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.9 | 4:53 | 7:47 |
| 2 | 14.9 | 4:54 | 7:47 |
| 3 | 14.9 | 4:54 | 7:47 |
| 4 | 14.9 | 4:55 | 7:46 |
| 5 | 14.9 | 4:55 | 7:46 |
| 6 | 14.8 | 4:56 | 7:46 |
| 7 | 14.8 | 4:56 | 7:46 |
| 8 | 14.8 | 4:57 | 7:46 |
| 9 | 14.8 | 4:58 | 7:45 |
| 10 | 14.8 | 4:58 | 7:45 |
| 11 | 14.8 | 4:59 | 7:44 |
| 12 | 14.7 | 5:00 | 7:44 |
| 13 | 14.7 | 5:00 | 7:44 |
| 14 | 14.7 | 5:01 | 7:43 |
| 15 | 14.7 | 5:02 | 7:43 |
| 16 | 14.7 | 5:03 | 7:42 |
| 17 | 14.6 | 5:03 | 7:41 |
| 18 | 14.6 | 5:04 | 7:41 |
| 19 | 14.6 | 5:05 | 7:40 |
| 20 | 14.6 | 5:06 | 7:39 |
| 21 | 14.5 | 5:07 | 7:39 |
| 22 | 14.5 | 5:07 | 7:38 |
| 23 | 14.5 | 5:08 | 7:37 |
| 24 | 14.5 | 5:09 | 7:36 |
| 25 | 14.4 | 5:10 | 7:36 |
| 26 | 14.4 | 5:11 | 7:35 |
| 27 | 14.4 | 5:12 | 7:34 |
| 28 | 14.3 | 5:13 | 7:33 |
| 29 | 14.3 | 5:14 | 7:32 |
| 30 | 14.3 | 5:15 | 7:31 |
| 31 | 14.2 | 5:16 | 7:30 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 7.66 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 1.64 kWh/m² to a high of 7.66 kWh/m² in July across the year — July's 7.66 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 7.7 | 7.7 | 7.7 | 7.8 | 7.8 | 7.8 | 7.7 | 7.7 | 7.7 | 7.7 | 7.7 | 7.7 | 7.7 | 7.7 | 7.6 | 7.6 | 7.6 | 7.6 | 7.6 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.4 | 7.4 | 7.4 | 7.3 | 7.3 | 7.3 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 7.7 | Intense |
| 2 | 7.7 | Intense |
| 3 | 7.7 | Intense |
| 4 | 7.8 | Intense |
| 5 | 7.8 | Intense |
| 6 | 7.8 | Intense |
| 7 | 7.7 | Intense |
| 8 | 7.7 | Intense |
| 9 | 7.7 | Intense |
| 10 | 7.7 | Intense |
| 11 | 7.7 | Intense |
| 12 | 7.7 | Intense |
| 13 | 7.7 | Intense |
| 14 | 7.7 | Intense |
| 15 | 7.6 | Intense |
| 16 | 7.6 | Intense |
| 17 | 7.6 | Intense |
| 18 | 7.6 | Intense |
| 19 | 7.6 | Intense |
| 20 | 7.5 | Intense |
| 21 | 7.5 | Intense |
| 22 | 7.5 | Intense |
| 23 | 7.5 | Intense |
| 24 | 7.5 | Intense |
| 25 | 7.5 | Intense |
| 26 | 7.4 | Intense |
| 27 | 7.4 | Intense |
| 28 | 7.4 | Intense |
| 29 | 7.3 | Intense |
| 30 | 7.3 | Intense |
| 31 | 7.3 | Intense |
Hazard calendar for Eureka
None of Eureka's seasonal hazards are active in July. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Eureka's rainy season runs November–March, when most of the year's rain falls.
Is July a good time to visit Eureka?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is a reasonable time to visit Eureka for sightseeing.
What to pack for Eureka in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Eureka sees daytime highs around 60°F and nights near 53°F. Pack sun protection. Worth having: a warm layer.
Sea temperature near Eureka in July
The nearest coast averages about 54°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 55°F and coldest in March near 51°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 52 | 52 | 51 | 52 | 52 | 53 | 54 | 55 | 55 | 54 | 53 | 53 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 52 | Bracing |
| Feb | 52 | Bracing |
| Mar | 51 | Bracing |
| Apr | 52 | Bracing |
| May | 52 | Bracing |
| Jun | 53 | Bracing |
| Jul | 54 | Bracing |
| Aug | 55 | Bracing |
| Sep | 55 | Bracing |
| Oct | 54 | Bracing |
| Nov | 53 | Bracing |
| Dec | 53 | Bracing |
UV index in Eureka in July
Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Eureka peaks around June 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 9 | 10 | 9 | 8 | 5 | 5 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 9 | Very high |
| Jun | 10 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | High |
| Oct | 5 | Moderate |
| Nov | 2 | Low |
| Dec | 2 | Low |
Air quality in Eureka in July
Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.
Air quality in Eureka is worst in September — around 35 µg/m³ PM2.5 (poor), about 6.3× the cleanest month (December, 6 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 7 | 8 | 9 | 8 | 9 | 11 | 28 | 35 | 8 | 7 | 6 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Poor | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 7 | Good |
| Mar | 8 | Good |
| Apr | 9 | Good |
| May | 8 | Good |
| Jun | 9 | Good |
| Jul | 11 | Good |
| Aug | 28 | Moderate |
| Sep | 35 | Poor |
| Oct | 8 | Good |
| Nov | 7 | Good |
| Dec | 6 | Good |
Where is Eureka?
Eureka sits at 40.8°N, 124.2°W, 39 ft above sea level, in United States. The nearest listed city is Bayside, 6.2 mi away.
Topography around Eureka
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Eureka.
Within 2 miles, the terrain around Eureka has only modest variations in elevation — a maximum elevation change of 302 ft around an average of 39 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,293 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,415 ft.
The land around Eureka is covered by water (35%) and artificial surfaces (32%) within 2 miles, water (46%) and trees (39%) within 10 miles, and trees (64%) and water (30%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Eureka (40.8021°, -124.1637°, elevation 39 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).