San Pedro, Bolivia

1. Sun10 AM49°8 mph
2. 11 AM50°7 mph
3. 12 PM52°8 mph
4. 1 PM54°12 mph
5. 2 PM55°12 mph
6. 3 PM56°12 mph
7. 4 PM55°14 mph
8. 5 PM55°13 mph
9. 6 PM54°15 mph
10. 7 PM52°17 mph
11. 8 PM49°18 mph
12. 9 PM47°16 mph
13. 10 PM46°15 mph
14. 11 PM46°17 mph
15. Mon12 AM45°18 mph
16. 1 AM45°19 mph
17. 2 AM44°19 mph
18. 3 AM44°19 mph
19. 4 AM44°16 mph
20. 5 AM44°13 mph
21. 6 AM44°12 mph
22. 7 AM44°12 mph
23. 8 AM46°12 mph
24. 9 AM50°12 mph
25. 10 AM52°12 mph
26. 11 AM52°13 mph
27. 12 PM53°14 mph
28. 1 PM53°15 mph
29. 2 PM54°14 mph
30. 3 PM55°14 mph
31. 4 PM55°14 mph
32. 5 PM55°16 mph
33. 6 PM52°17 mph
34. 7 PM49°16 mph
35. 8 PM48°13 mph
36. 9 PM48°12 mph
37. 10 PM50°13 mph
38. 11 PM50°11 mph
39. Tue12 AM48°10 mph
40. 1 AM45°10 mph
41. 2 AM45°11 mph
42. 3 AM45°8 mph
43. 4 AM45°6 mph
44. 5 AM44°9 mph
45. 6 AM42°10 mph
46. 7 AM41°8 mph
47. 8 AM42°7 mph
48. 9 AM44°6 mph

Scroll sideways for more hours. Pick an hour for every number.

1. TodaySep 2756°44°Mostly clear—wind 18 mph
2. MonSep 2855°44°Partly cloudy—wind 19 mph
3. TueSep 2953°44°Rain showers—0.21 inwind 14 mph
4. WedSep 3049°44°Cloudy—wind 21 mph
5. ThuOct 151°40°Clear—wind 21 mph
6. FriOct 254°48°Cloudy—wind 13 mph
7. SatOct 354°47°Partly cloudy—wind 15 mph
8. SunOct 453°45°Mostly clear—wind 18 mph
9. MonOct 556°44°Partly cloudy—wind 18 mph
10. TueOct 656°49°Partly cloudy—wind 12 mph
11. WedOct 7~56°46°Model mean0.04 in
12. ThuOct 8~55°46°Model mean0.14 in
13. FriOct 9~56°45°Model mean0.12 in
14. SatOct 10~56°46°Model mean0.02 in
15. SunOct 11~56°46°Model mean
16. MonOct 12~54°46°Model mean

• Feels like47°
• WindSE 8 mph
• Humidity48%
• Dew point30°
• Pressure30.25 inHg
• UV index10 · Very highclear-sky peak 16 today
• Sunrise and sunsetSunrise · Sunset
• Moonrise7:35 PMMoonset 6:45 AM
• Moon phaseWaning gibbous99% lit

Each line is one model’s own forecast at its own grid cell: three kilometers for HRRR, a quarter of a degree for the global models, which can sit a few hundred meters above or below the town. Where they agree the forecast is settled; where they part is where it is not.

NWS gridGFSGEFS ± spreadECMWFECMWF AI

A ~ marks a high or low read from six-hourly steps, which miss the true extreme by a degree or two.

ECMWF ensemble meteogram

10 daysTemperature plume

None of these is a measurement. Each is a rating of the forecast ahead, and of what is happening at the point right now, against what the activity or the ailment is known to mind, and each names the figure that decided it. An ailment or a pest is rated as a risk, low to extreme; an activity, a chore or a journey as a condition, poor to ideal.

Each rating says which span it is for: the rest of today’s daylight, tonight, or the next 24 hours.

Tonight has no dark, clear hour without a bright moon in this forecast. Rated fair.

The last night runs past the end of the forecast and is rated on the hours it covers.

Dark is the sun 18 degrees below the horizon; where it never gets that low, 12 degrees, marked nautical. Clear is sky cover of 20% or less. A bright moon is one above the horizon with a quarter or more of its disc lit. Transparency in the table is estimated from surface humidity (70% and 85% mark fair and poor) and visibility, since the forecast carries no haze or high cloud moisture. Seeing and transparency by hour, where shown, are Environment and Climate Change Canada’s astronomy forecast (regional model; seeing from cloud, wind shear, turbulence near the ground and the surface temperature trend; transparency from the moisture through the whole air column), under the Open Government Licence - Canada. Dew is the air within 2 °C of its dew point. Excellent is four or more clear moonless hours with good transparency; good is three; fair is one, or two clear hours.

Golden hour is the sun between 6 degrees above the horizon and 4 degrees below it; blue hour is the sun between 4 and 6 degrees below. These are the definitions timeanddate.com and PhotoPills use. Directions are degrees clockwise from true north, where the sun’s upper edge and the moon’s center cross a flat horizon; hills and buildings change both. None means the sun does not reach that height on the day; all day means it stays inside the band.

Hours fit for spraying, and the days dry enough for fieldwork and hay, read from this forecast’s wind, gusts, humidity, temperature and rain.

Spraying windows

• Sun 10 AM to 1 PM 3 hours, every hour within the rules
• Tue 8 AM to 2 PM 6 hours, every hour within the rules
• Tue 8 PM to 10 PM 2 hours, every hour within the rules
• Wed 2 AM to 8 PM 18 hours, every hour within the rules
• Thu 8 AM to Fri 2 AM 18 hours, every hour within the rules
• Fri 8 PM to Sat 2 AM 6 hours, every hour within the rules
• Sat 8 AM to 2 PM 6 hours, every hour within the rules
• Sat 8 PM to Sun 2 PM 18 hours, every hour within the rules

Good Marginal No

Field days

Spraying: sustained wind 3 to 10 mph, the range US extension services and most labels give; gusts no more than 15 mph (this page’s limit); delta T (air minus wet-bulb temperature) 2 to 8 °C preferred and 8 to 10 °C marginal, from GRDC guidance, with the wet bulb by Stull’s formula; no hour at a 30% chance of rain or 0.25 mm forecast during the rain-free time. Follow the product label, which overrides all of this. Field days: dry is no daytime hour at a 30% chance and under 1 mm all day, wet is 6 mm (0.25 in) or more; soil moisture is not in the forecast, so ground still wet from earlier rain is not accounted for. Hay drying marks a dry day with humidity down to 50% and a breeze of 5 mph or more.

The best-rated day this week is Sunday, rated best.

Periods in bold fall within an hour of sunrise or sunset. The weather’s side is the fishing index · Solunar tables for San Pedro, by month

Major periods are two hours centered on the moon’s passage overhead and underfoot; minor periods are one hour centered on moonrise and moonset: the conventional durations of John Alden Knight’s solunar tables (1936). The rating is this site’s: one point to start, two more within a day and a half of a new or full moon (one more within three and a half days), and one more when a period falls within an hour of sunrise or sunset. The theory has mixed support in fisheries research; the times are exact astronomy.

1. Today56° · WSW 7–14 mph

   Mostly clear. High near 13°C. Westsouthwest wind 11 to 23 km/h.

2. Tonight44° · NNE 13–19 mph

   Mostly clear. Low near 6°C. Northnortheast wind 21 to 31 km/h.

3. Monday55° · N 12–16 mph

   Partly cloudy. High near 13°C. North wind 19 to 26 km/h.

4. Monday Night44° · NNW 6–17 mph

   Heavy rain showers. Low near 7°C. Northnorthwest wind 9 to 28 km/h. Precipitation around 3 mm.

5. Tuesday53° · N 6–12 mph

   Rain showers. High near 12°C. North wind 10 to 19 km/h. Precipitation around 1.5 mm.

6. Tuesday Night44° · SSW 5–14 mph

   Rain showers. Low near 7°C. Southsouthwest wind 8 to 22 km/h. Precipitation around 0.9 mm.

7. Wednesday49° · W 8–9 mph

   Cloudy. High near 10°C. West wind 13 to 15 km/h.

8. Wednesday Night44° · S 14–21 mph

   Clear. Low near 7°C. South wind 22 to 33 km/h.

9. Thursday51° · ESE 4–6 mph

   Clear. High near 11°C. Eastsoutheast wind 6 to 10 km/h.

10. Thursday Night40° · N 6–9 mph

    Partly cloudy. Low near 4°C. North wind 10 to 15 km/h.

11. Friday54° · N 6–13 mph

    Cloudy. High near 12°C. North wind 10 to 21 km/h.

12. Friday Night48° · E 4–10 mph

    Clear. Low near 9°C. East wind 6 to 16 km/h.

13. Saturday54° · NW 4–15 mph

    Partly cloudy. High near 12°C. Northwest wind 6 to 24 km/h.

14. Saturday Night47° · SSW 4–6 mph

    Clear. Low near 8°C. Southsouthwest wind 6 to 10 km/h.

15. Sunday53° · WNW 3–13 mph

    Mostly clear. High near 12°C. Westnorthwest wind 5 to 21 km/h.

16. Sunday Night45° · S 9–19 mph

    Partly cloudy. Low near 7°C. South wind 15 to 30 km/h.

17. Monday56° · NE 2–9 mph

    Partly cloudy. High near 13°C. Northeast wind 3 to 15 km/h.

18. Monday Night44° · NNE 9–11 mph

    Cloudy. Low near 7°C. Northnortheast wind 14 to 18 km/h.

19. Tuesday56° · N 1–12 mph

    Partly cloudy. High near 13°C. North wind 2 to 19 km/h.

20. Tuesday Night49° · NNE 10 mph

    No forecast. Low near 10°C. Northnortheast wind around 16 km/h.

Climate of San Pedro: normals, records and every month

The forecast office edits about sixty fields for every cell of its grid. The common ones are above; these are the rest, as the daily extreme, for anyone who needs the mixing height, the fire danger or the swell.